WebDAQ 504 User's Guide
May 2020. Rev 6

Contents
About this User's Guide
Introducing the WebDAQ 504
Se ng up the WebDAQ
Func onal Details
Speciﬁca ons
EU Declara on of Conformity

Trademark and Copyright Informa on
Measurement Compu ng Corpora on, InstaCal, Universal Library, and the Measurement Compu ng logo areeither trademarks or registered trademarks of Measurement Compu ng Corpora on. Refer to the Copyrights &Trademarks sec on on mccdaq.com/legal for more informa on about Measurement Compu ng trademarks.
Other product and company names men oned herein are trademarks or trade names of their respec ve
companies.
© Measurement Compu ng Corpora on. All rights reserved. No part of this publica on may be reproduced,
stored in a retrieval system, or transmi ed, in any form by any means, electronic, mechanical, by photocopying,recording, or otherwise without the prior wri en permission of Measurement Compu ng Corpora on.
No ce
Measurement Compu ng Corpora on does not authorize any Measurement Compu ng Corpora on productfor use in life support systems and/or devices without prior wri en consent from Measurement Compu ng
Corpora on. Life support devices/systems are devices or systems that, a) are intended for surgical implanta on
into the body, or b) support or sustain life and whose failure to perform can be reasonably expected to result ininjury. Measurement Compu ng Corpora on products are not designed with the components required, and are
not subject to the tes ng required to ensure a level of reliability suitable for the treatment and diagnosis ofpeople.

About this User's Guide
This user's guide describes the Measurement Compu ng WebDAQ 504 data acquisi on device, the WebDAQ
web interface, and lists device speciﬁca ons.

WebDAQ 504 User's Guide

Where to ﬁnd more informa on
Addi onal informa on about the WebDAQ Series of internet enabled data loggers is available on our website atwww.mccdaq.com/WebDAQ. You can also contact Measurement Compu ng Corpora on with speciﬁcques ons.
WebDAQ web interface: Open the Help window for informa on about using WebDAQ so ware.
Knowledgebase: kb.mccdaq.com
WiFi adapters approved for use with WebDAQ Series hardware: www.mccdaq.com/pdfs/manuals/wdwiﬁ.pdf
Tech support form: www.mccdaq.com/support/support_form.aspx
Email: techsupport@mccdaq.com
Phone: 508-946-5100 and follow the instruc ons for reaching Tech Support
For interna onal customers, contact your local distributor. Refer to the Interna onal Distributors sec on on our
website at www.mccdaq.com/Interna onal.

Hazardous voltages
Take the following precau ons if you connect hazardous voltages to the WebDAQ 504. A hazardous voltage is a
voltage greater than 42.4 Vpk or 60 VDC to earth ground.
Ensure that hazardous voltage wiring is performed only by qualiﬁed personnel adhering to local electricalstandards.
Do not mix hazardous voltage circuits and human-accessible circuits on the same device.
Make sure that devices and circuits connected to the WebDAQ are properly insulated from humancontact.
Hazardous loca ons: The WebDAQ is not cer ﬁed for use in hazardous loca ons.
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WebDAQ 504 User's Guide

Introducing the WebDAQ 504
The WebDAQ 504 is part of the WebDAQ Series of Internet enabled data loggers. WebDAQ 504 is a
vibra on/acous c data acquisi on and logging device that provides the following features:
4 simultaneously sampled analog inputs
24-bit resolu on
Data rates up to 51.2 kS/s per channel
AC/DC coupling
IEPE signal condi oning
An -aliasing ﬁlters
Overvoltage protec on
Four bidirec onal, isolated DIO
10/100 Ethernet interface
Support for USB WiFi adapters for wireless connec vity
Support for USB mass storage devices and SD cards for data logging or ﬁle transfer
Powered by an external power supply
WebDAQ Series devices are designed with an integrated opera ng system and web interface. You communicate
with the device over a network connec on using the web interface opened in a web browser.
Mobile support – access the WebDAQ from any device with a web browser, such as a phone or tablet
Remote monitoring and control
Run simple to complex logging opera ons
Flexible task schedulingPowered by Raspberry Pi
The WebDAQ is designed with the Raspberry Pi Compute Module, featuring a quad core processor with speeds
up to 1.2 GHz, 1 GB RAM and 4 GB Flash memory.

Integrated opera ng system and web service
The WebDAQ is a complete data acquisi on system containing an embedded opera ng system and web server.
The opera ng system resides in internal ﬂash memory, and includes a web service and device driver. All
conﬁgura on, acquisi on, and data management is performed using the web interface.

Ethernet interface
The WebDAQ has a built-in 10/100 BASE-T auto-nego a on, high-speed communica on port. You can accessand conﬁgure your WebDAQ from anywhere with access to the network to which it is connected. A unique
MAC address is assigned to each device at the factory. You conﬁgure the Ethernet connec on se ngs through a
web interface. The default network device name uses the format webdaq-xxxxxx, where xxxxxx are the lower
six digits of the factory-assigned MAC address. You can change this name with the web interface.

Open-source so ware
WebDAQ ﬁrmware uses open-source so ware components. Refer to Licenses for the licensing informa on ofeach component. Open-source code is available upon request from info@mccdaq.com.

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WebDAQ 504 User's Guide

Saving large data ﬁlesIf you expect to acquire a large amount of data to a single ﬁle when logging to external media, do not use
media forma ed with the FAT32 ﬁle system. FAT32 is limited to a 4 GB maximum ﬁle size. If the log ﬁle on
FAT32 media grows beyond that size, a "File too large" error is returned and the acquisi on stops. Before
star ng a logging session of this type, reformat the media using a diﬀerent ﬁle system such as NTFS. Refer tothe Frequently Asked Ques ons help topic for more informa on about ﬁle systems.

UnpackingAs with any electronic device, you should take care while handling to avoid damage from sta celectricity. Before removing the board from its packaging, ground yourself using a wrist strap or by simply
touching the computer chassis or other grounded object to eliminate any stored sta c charge.
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WebDAQ 504 User's Guide

Se ng up the WebDAQ
Connec ng to a local area network
The WebDAQ requires a TCP/IP connec on to a network or the Ethernet port of a computer. A standard
Ethernet cable is shipped with the device. The WebDAQ IP address type is set by default for DHCP/Link-Local.
When connected to a network, the device ﬁrst a empts to receive an IP address from a DHCP server. If thisfails, a link-local address is used. Use of a sta c address requires conﬁgura on via the web interface. The IP
address iden ﬁes the WebDAQ on the network, and is used to access the web interface.

Connec ng to a network with DHCP enabled
Connect one end of the Ethernet cable to the connector on the WebDAQ rear panel, and connect the other end
to a 10Base-T or 100Base-TX compa ble Ethernet port, hub, or switch.
Once the device is detected, DHCP assigns an address. A diﬀerent address may be assigned each me thehardware is connected to the network.
WiFi support
A er successfully conﬁguring a wired connec on, you can use the web interface to conﬁgure theWebDAQ for wireless communica on. Refer to the Conﬁguring the WebDAQ for wirelesscommunica on sec on for more informa on.

Connec ng directly to a PC
Connect one end of the Ethernet cable to the connector on the WebDAQ rear panel, and connect the other end
directly to the Ethernet port on a PC. The WebDAQ a empts to communicate with the host PC using
169.254.100.100 – the link-local address stored on the device. The host PC may accept this address or use adiﬀerent address. The link-local address is valid only for communica ons between the WebDAQ and the host PC
to which it is connected.

Connec ng the external power adapter
Connect the network cable before connec ng to external power
Connec ng to the external supply before installing on a network results in the device a emp ng toauto-nego ate a network address before one is available.
Connect the adapter to the power connector labeled EXT PWR on the device rear panel, and plug the AC
adapter into an electrical outlet.
Press the POWER bu on. The POWER LED on the rear panel turns yellow as the hardware starts up, and green
when it is ready for use.

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Detec ng the device on a network
WebDAQ uses the "zeroconf" zero-conﬁgura on protocol to announce its presence on a local area network.
Zeroconf uses a device name which can be accessed from other computers on the network.
Zero-conﬁgura on networking is helpful to ﬁnd your WebDAQ hardware on the network
The easiest way to add zeroconf support to Windows is to install Bonjour Print Services. Bonjour
so ware is Apple's implementa on of zero-conﬁgura on networking, and is readily available as a freedownload – open a browser window and search for Bonjour Print Services. Zeroconf is built into popularapplica ons such as Apple ITunes® and instant messaging so ware, so your computer may alreadysupport it. Many Linux systems will have the avahi version of zeroconf installed by default, so it's likely
zeroconf is available if you're running Linux.

Accessing the WebDAQ web interface
To access the WebDAQ web interface, open a browser window and enter h p://webdaq-xxxxxx.local, where
xxxxxx is the last 6 digits of the MAC address. The MAC address is on a label at the bo om of the WebDAQ
enclosure.
If your network is conﬁgured for the zeroconf protocol, the WebDAQ web interface opens.
If the web interface does not open or an error is returned, install a device discovery tool such as Bonjour
Print Services. Refer to the note above about zero-conﬁgura on networking.
Browser support
The latest version of Chrome, Firefox, Safari, UC Browser, or Opera recommended. Compa ble with theEdge browser version 79 and up. Not recommended for use with earlier versions of the Edge browser.
Not recommended for use with Internet Explorer.
The WebDAQ web interface is shown here.

Figure 1. WebDAQ web interface
Use the WebDAQ web interface to conﬁgure hardware and acquisi on op ons, schedule and run jobs, and toview and manage data. The Help window provides details about all components on the web interface.

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WebDAQ 504 User's Guide

Once a connec on is established and you can communicate to the device, you can change the conﬁgura on forother network scenarios.

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WebDAQ 504 User's Guide

Conﬁguring the WebDAQ for wireless communica on
Once communica on is established on a wired network, you can connect a WiFi adapter to the USB port anduse the web interface to conﬁgure the WebDAQ for communica on over a wireless network. With the WebDAQ
connected through the wired connec on, perform the following procedure.
1. Connect an approved WiFi adapter to the USB port on the WebDAQ rear panel.
A list of WiFi adapters approved for use with WebDAQ Series hardware is available on our website atwww.mccdaq.com/pdfs/manuals/wd-wiﬁ.pdf.
2. Open the WebDAQ web interface in a browser window and go to the Device window, Network tab.
3. Select WiFi. Once the list of available networks updates, select the wireless network that you want toconnect to, and enter the password, if any.
If the connec on is successful, the selected wireless network will show above this list with a checkmark
next to it.
You can click on the selected network to open a WiFi Network Se ngs dialog box where you can forget thecurrent network or conﬁgure the IP address type (DHCP/Link-Local or Sta c).
4. Disconnect the Ethernet cable from the LAN connec on.
Wait a few seconds, and refresh the browser window.
Changing to a wireless network may require a reboot
If a connec on can't be established a er changing the network, you may need to reboot the opera ng
system and restart the WebDAQ using the Power bu on.

Conﬁguring the network router for communica on across networks
To communicate with the WebDAQ over the internet from a computer connected to a diﬀerent network, youmust change the network conﬁgura on of the network router.
Cau on! This procedure should only be performed by a network administrator or computer
professional. Incorrect se ngs can signiﬁcantly disrupt a network.
In the following procedure, the WebDAQ is installed on the host LAN, the computer is installed on the client
LAN, and it is assumed that you have successfully connected the device to a local network.
1. Determine the IP address of the WebDAQ – open the Device window from the web interface, and note the
IP Address value on the Network Se ngs tab.
2. Conﬁgure your router so that the address determined above is a sta c address. The procedure foraccomplishing this varies between routers; refer to your router documenta on for instruc ons.
3. Conﬁgure the ﬁrewall/router to forward an unused port to port 80 on the WebDAQ at the IP address
conﬁgured for the device.
Note the sta c IP address assigned to the router – this is referred to as the WAN address.
4. To access your WebDAQ from a remote loca on, enter the WAN address followed by the port selected
above preceded by a colon in the web browser.
The format of the address entered in the browser is: 00.000.00.00:00000 (WAN address of router:port
selected for the WebDAQ).

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Security
Use the web interface to set the level of access to the website and to change the administrator password.
High: access to the web page requires a password.
Medium: access to the web page is permi ed for any user, and data can be read by any user, but changes
to the device conﬁgura on or ﬁles require a password.
Oﬀ: full access is permi ed for all users; no password is required.
By default, security access is set to "Oﬀ", and the administrator password is set to "admin".
To change the security level or password, open the web interface and go to the Device window, Security tab.
Use the device Reset bu on to restore security se ngs to factory default values.

Restoring factory default se ngs
To restore network conﬁgura on and security se ngs to the factory default values, use a paper clip to press
the CONFIG RESET bu on. When pressed, the default network and security se ngs are wri en to the device
and the WebDAQ is rebooted.
Factory default se ngs
Parameter
IP address
Subnet mask
Gateway
DHCP se ng
Security level
Password for the admin
account
Password for the shareaccount
Device nameSpeciﬁca on
192.168.0.101
255.255.255.0
192.168.0.1
DHCP + link-local enabledOﬀadmin (case-sensi ve)
share (case-sensi ve)
webdaq-xxxxxx, where xxxxxx is the last 6 digits of the MAC address(printed on the label on the underside of the device).

The network se ngs, security level, user account passwords and device name can be changed with the
WebDAQ web interface.
Shared folders and mapped drives are reset when factory defaults are restored.
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Func onal Details
Func onal block diagram
Device func ons are illustrated in the block diagram shown here.

Figure 2. Func onal block diagram

Front panel components

Figure 3. Front panel
1

Screw terminal

2

BNC connectors

Screw terminal (Digital connec ons)
Connect up to four digital I/O lines (DIO0 to DI03) to the detachable screw terminal.

Figure 4. Screw terminal pinout
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The digital ground (GND) terminals provide a common ground for the digital bits.
The digital I/O lines are electrically isolated from the analog circuits. Each bit is individually conﬁgurable for
input or output, and features Schmi trigger inputs and open drain outputs. All DIO channels are pulled high to
5 V.
Any digital bit can be conﬁgured with the web interface as a trigger to start or stop an acquisi on, to trigger an
alarm and be driven high or low when an alarm or occurs, or be driven high or low when an event condi on is
occurs.

BNC connectors (Analog connec ons)
Connect up to four analog inputs to the BNC connectors (AI0+/AI0– to AI3+/AI3–). All analog inputs are
simultaneously sampled at rates of up to 51.2 kS/s per channel.

Figure 5. BNC connector pinout
The center pin of the connector (AI+) provides the DC excita on (when enabled) and posi ve input signal
connec on. The shell of the connector (AI–) provides the excita on return path and AC ground reference
Use the web interface to individually conﬁgure each input for voltage or Integrated Electronic Piezoelectric(IEPE) sensor measurements. IEPE sensor types include accelera on, sound pressure, velocity, and force.
Voltage channels can be conﬁgured for AC or DC coupling. IEPE channels are automa cally conﬁgured for AC
coupling. An internal excita on source current is automa cally enabled for IEPE sensor types.

Analog signal connec ons
You can connect ground-referenced or ﬂoa ng signal sources to the WebDAQ 504. Use a ﬂoa ng connec on tominimize ground noise. If you make a ground-referenced connec on between the signal source and theWebDAQ 504, make sure the voltage on the AI– shell is in the common-mode range to ensure proper
opera on. The AI- shell is protected against accidental contact with overvoltages within the overvoltage
protec on range. Refer to the Speciﬁca ons chapter for more informa on about opera ng voltages andovervoltage protec on. The ﬁgure below shows a diagram for connec ng a grounded signal source to the
WebDAQ 504.

Figure 6. Connec ng a grounded IEPE sensor

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The ﬁgure below shows a diagram for connec ng a ﬂoa ng signal source to the WebDAQ 504.

Figure 7. Connec ng a ﬂoa ng IEPE sensor

Analog input circuitry
The analog input channels are referenced to chassis ground through a 50 Ω resistor. To minimize ground noise,make sure the chassis ground is connected to earth ground. The input signal on each channel is buﬀered,condi oned, and then sampled by a 24-bit Delta-Sigma ADC.

Figure 8. Input Circuitry for One Channel

Overvoltage protec on
WebDAQ 504 provides 30 V overvoltage protec on for each channel.

AC/DC coupling
Use the web interface to conﬁgure voltage channels for AC or DC coupling. Conﬁgure for DC if the signal has nooﬀset voltage or if the DC content of the acquired signal is not important.
AC coupling is automa cally enabled for IEPE channels to remove any DC oﬀset from the measurement.

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Common-mode bias current
The WebDAQ 504 uses common-mode bias current to bias the current-limi ng diodes when IEPE current isturned oﬀ. When the WebDAQ 504 is using grounded signal sources, the current causes an error that isdependent on the AI– lead impedance, and is approximately 50 ppm of range and 15 ppm of reading per Ω ofAI– impedance. The common-mode bias current causes an error only with grounded sources and is not an issue
with ﬂoa ng signal sources. For best accuracy, use a ﬂoa ng connec on or use low-impedance leads whenconnec ng grounded signal sources; refer to the connec on diagram shown below.

Figure 9. Measurement Error Introduced by Common-Mode Bias Current

Data rates
The frequency of the master mebase (fM) controls the data rate (fs) of the WebDAQ 504. The internal mastermebase frequency on the WebDAQ 504 is 13.1072 MHz. The data rates available on the WebDAQ 504 can becalculated with the following equa on: fs = (fM ÷ 256)/n , where n is any integer from 1 to 31. The data rate
must remain within the appropriate data rate range. Using the internal master mebase of 13.1072 MHz results
in data rates of 51.2 kS/s, 25.6 kS/s, 17.067 kS/s, and so on, down to 1.652 kS/s, depending on the value of n.

An -aliasing ﬁlters
The WebDAQ 504 uses a combina on of analog and digital ﬁltering to provide an accurate representa on of inband signals while rejec ng out-of-band signals. The ﬁlters discriminate between signals based on thefrequency range, or bandwidth, of the signal. The three important bandwidths to consider are the passband,the stopband, and the alias-free bandwidth.
The WebDAQ 504 represents signals within the passband, as quan ﬁed primarily by passband ﬂatness andphase nonlinearity. All signals that appear in the alias-free bandwidth are either unaliased signals or signals thathave been ﬁltered by at least the amount of the stopband rejec on.

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PassbandThe signals within the passband have frequency-dependent gain or a enua on. The small amount of varia on
in gain with respect to frequency is called the passband ﬂatness. Digital ﬁlters adjust the frequency range of the
passband to match the data rate, so the amount of gain or a enua on at a given frequency depends on thedata rate. The ﬁgure below shows typical passband response for the WebDAQ 504.

Figure 10. Typical Passband Response
The ﬁgure below shows the passband at one data rate.

Figure 11. AC cutoﬀ frequency response

StopbandThe ﬁlter signiﬁcantly a enuates all signals above the stopband frequency. The primary goal of the ﬁlter is toprevent aliasing. Therefore, the stopband frequency scales precisely with the data rate. The stopband rejec onis the minimum amount of a enua on applied by the ﬁlter to all signals with frequencies within the stopband.

Alias-free bandwidth
Any signal that appears in the alias-free bandwidth of the WebDAQ 504 is not an aliased ar fact of signals at ahigher frequency. The alias-free bandwidth is deﬁned by the ability of the ﬁlter to reject frequencies above thestopband frequency, and it is equal to the data rate minus the stopband frequency.

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Rear panel components

Figure 12. Rear panel
123External power
connector
Power bu on
Func on bu on

4

LED indicators (4)7Ethernet connector

56

SD card slot
Factory reset bu on(recessed)

8
9Ground connector
USB connectors (2)External power connector
Connect the external AC adapter to the connector labeled EXT PWR on the rear panel. Click here to jump to thepower speciﬁca ons.

Power bu on
The bu on labeled POWER turns the WebDAQ device on and oﬀ. WebDAQ hardware is designed with a 2-pin
jumper (W1) that users can remove to con nuously power the device. The behavior of the POWER bu on
when jumper W1 is installed or removed is listed in the following table.
Jumper W1 installed (factory default se ng)

Jumper W1 removed

When the device is oﬀ, press the POWER bu on
brieﬂy to turn the device on.

The device is always on as long as the power
adapter is connected and receiving power(Power-On Mode).

When the device is on, press the POWER bu on
for approximately 1 second to shut down theopera ng system and WebDAQ hardware;release the bu on when the POWER LED blinks
yellow.
The opera ng system automa cally powers oﬀ
the device at the end of the shutdown
procedure.
Press and hold the POWER bu on for
approximately 4 seconds to force the device topower oﬀ. Any unsaved changes may be lostwhen powering down using this method.

Press for approximately 1 second to reboot thedevice; release the bu on when the POWER LED
blinks yellow.

Refer to Power-On Mode for the procedure to remove jumper W1 and enable Power-On mode.
The WebDAQ device can also be restarted or shut down using the web interface; refer to the WebDAQ
help for details.

Func on bu on
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The bu on labeled FUNC has two func ons; it can be used to eject external media or to start/stop an
acquisi on.
Eject external media (default): Pressing the bu on unmounts all removable media so they can be safely
removed from the device.
Start or stop an acquisi on (requires conﬁgura on with the web interface): When conﬁgured, pressing
this bu on starts an acquisi on, or stops an acquisi on that is currently running.
Use the web interface to safely unmount removable media, when present.
When removable media is plugged into the WebDAQ, the opera ng system opens it for wri ng. To safely
remove the media, you must unmount it ﬁrst.
When a job is conﬁgured to log data to external media, pressing FUNC while the job is running will not eject themedia.
The MEDIA LED is steady green when all media is unmounted and safe to remove, and oﬀ when all media isremoved.

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WebDAQ 504 User's Guide

LED status indicators
The WebDAQ has four LEDs on the rear panel that indicate the status of power and host communica ons. The
following table deﬁnes the LED states during normal opera on.
LED states – normal opera ng mode
Label
1: POWER

2: STATUS

3: ERROR

4: MEDIA

State
Steady yellow
Steady green
Blinkingyellow
Oﬀ
Blinkingyellow
Steady green
Flashing
green
100 ms on/2s
oﬀ)
Blinking
heartbeat
Blinking
green
Oﬀ
Blinkingyellow
Oﬀ
Blinkingyellow
Steady yellow
Blinking
green
Steady green

Descrip on
Device is boo ng up
Device boot is successful.
Device is shu ng down.
Device is oﬀ.
Device is conﬁguring hardware.
Hardware conﬁgura on is complete.
Wai ng for a scheduled start condi on to be met.

Scheduled start condi on is met; wai ng for job start condi on to be met.
Data is being acquired (job start condi on is met).
No error detected.
Error condi on is detected. This LED blinks even when the so ware is
conﬁgured to ignore the error.
Error state is cleared when the next schedule starts.
No error detected.
A job is conﬁgured to log to external media, but the job hasn't started yet;pushbu on will not let you eject media.
External media is inserted into the SD card slot or USB storage port.
Currently logging to an external SD card or USB storage device.
Media has been made safe for removal using the func on bu on, but has
not been removed.

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WebDAQ 504 User's Guide

WebDAQ LEDs behave diﬀerently when so ware is updated on the device. The following table deﬁnes the LED
states during a so ware update.
LED states – so ware update mode
LED
All LEDs
POWER
STATUS

ERROR

State
Solid yellow
Blinkingyellow
Blinking
green
Blinkingyellow
Blinking
green
Blinkingyellow

Descrip on
So ware update is star ng
So ware update is running
Update ﬁle is located; device is being updated
Update ﬁle cannot be located; insert media with update ﬁleUpdate is successful; device will reboot in approximately 5 seconds
Update failed; user must retry

Refer to Upda ng WebDAQ ﬁrmware for more informa on about WebDAQ ﬁrmware.

SD card slot
The SD slot accepts SD (Secure Digital), SDHC, SDXC, MMC, and TransFlash memory cards. Memory cards can beejected using the web interface or the hardware FUNC bu on, unless the bu on is conﬁgured to start/stop an
acquisi on.
When removable media is plugged into the WebDAQ, the opera ng system opens it for wri ng. Use the FUNC
bu on or web interface to unmount the SD card before removing.

Factory reset bu on
The recessed bu on labeled CONFIG RESET restores factory default se ngs. When pressed, the default se ngs
are wri en to the device and the WebDAQ is rebooted. Refer to the Restore factory default se ngs sec on fora list of the default se ngs that are restored.

Ethernet connector
The WebDAQ has one 10 Base-T/100 Base-TX, auto-nego a on, high-speed communica on port. The port
connector is an RJ-45, eight-posi on connector. The Ethernet port accepts shielded or unshielded twisted paircable. The maximum communica on distance without using a repeater is 100 m (328 ). For CE compliance themaximum distance is 3 m (9.84 ).

Ground connector
The WebDAQ ships with a ground screw in the connector labeled #6-32. To ground the WebDAQ chassis, a ach
a ring lug to a 14 AWG (1.6 mm) wire. Connect the ring lug to the grounding screw on the WebDAQ rear panel.
A ach the other end to a safety ground.

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WebDAQ 504 User's Guide

USB connectors
The two high-speed USB ports can be used for connec ons to a mass storage device and approved WiFi
adapter.
When removable media is plugged into the WebDAQ, the opera ng system opens it for wri ng. Use the FUNC
bu on or web interface to unmount the USB device before removing.
Use a self-powered hub when external media requires higher current
USB-powered hard drives may use an excessive amount of current during opera on. The WebDAQ
device could shut down or experience other errors if the power requirements of a connected device
exceed the power available. Use a self-powered hub if the current requirement of external media
exceeds 500 mA.
We recommend that you connect USB-powered hard drives before powering up the WebDAQ.

Logging data
You can log up to 3 GB of data to internal WebDAQ storage. To generate larger data ﬁles, log data to external
media with a storage capacity suitable for the acquisi on. USB drives and SD cards are available in diﬀerent ﬁleformats, and OS support for each format varies. WebDAQ supports FAT32, exFAT, ext2/3/4, NTFS ﬁle systems.
When genera ng large data ﬁles with Windows or Mac, or transferring ﬁles between opera ng systems, werecommend using external media forma ed with the exFAT ﬁle system, such as an SDXC memory card. Whenrunning Linux, use external media forma ed with the ex2/ex3/ex4 ﬁle system. Refer to the WebDAQ help FAQ
for more informa on about ﬁle formats.
File too large error
If you generate data that exceeds the capacity of the selected storage loca on, a "File too large" error isreturned and the acquisi on stops. To avoid interrup ons, select a storage loca on with a large capacity.

Logging data to external media
Acquiring data at high speeds can generate large ﬁle sizes. If you expect to acquire a large amount ofdata to a single ﬁle when logging to external media, do not use media forma ed with the FAT32 ﬁlesystem. FAT32 is limited to a 4 GB maximum ﬁle size. If the log ﬁle on FAT32 media grows beyond thatsize, a "File too large" error is returned and the acquisi on stops. Before star ng a logging session ofthis type, reformat the media using a diﬀerent ﬁle system such as NTFS. Refer to the Frequently Asked
Ques ons help topic for more informa on about ﬁle systems.

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WebDAQ 504 User's Guide

Power-On Mode
WebDAQ Series hardware can be conﬁgured to start automa cally when power is applied, instead of requiring
users to press the POWER bu on. This is useful if the WebDAQ is opera ng in a remote loca on and a power
loss occurs. This "power-on mode" is enabled by removing a 2-pin jumper (labeled W1) from the WebDAQ
circuit board.
When jumper W1 is removed, the device does not shutdown completely unless the power adapter is
unplugged from the device or power source.
Perform the procedure below to remove jumper W1 from the WebDAQ circuit board and enable power-on
mode.
Cau on! The discharge of sta c electricity can damage some electronic components. Before removing
the WebDAQ device from its housing, ground yourself using a wrist strap or touch the computer chassis
or other grounded object to eliminate any stored sta c charge.
1. Power down the WebDAQ device and disconnect the power supply.
2. On the rear panel, remove the Ethernet cable, power cable, SD card, and any USB devices.
3. Remove the #6-32 ground screw.
4. Remove the nut and washer from the EXT PWR connector.
5. Remove the two front panel bezel screws and remove the front bezel.
6. Slide out the circuit board with the front panel intact.
7. Remove jumper W1 from the speciﬁed loca on shown below.

8. Slide the circuit board back into the enclosure.
9. A ach the front bezel and secure with the two bezel screws removed in step 5.
10. Secure the power connector with the nut and washer (removed in step 4) to the power connector, anda ach the ground screw, Ethernet and power cables, and any USB devices.
To automa cally run a schedule when the WebDAQ powers up, enable the "Automa cally start schedule on
system startup" op on on the Schedule Se ngs dialog box of the web interface. If a power cycle occurs, theschedule will restart from the beginning, regardless of which job was running when the power was lost. In
order to retain the data from each schedule start, make sure to set the logging op on for each job to "Append
Date/Time to File Name" so that each run a er power loss creates a new data ﬁle rather than overwri ng theoriginal ﬁle. Refer to the WebDAQ help for details about how to conﬁgure schedule and logging op ons.
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WebDAQ 504 User's Guide

Enabling power-on mode with a complex or date/ me triggered schedule
When running a complex or date/ me-triggered schedule with both power-on mode and auto startschedule enabled, be aware that the schedule may not run automa cally a er a power cycle if the dateor me trigger is no longer valid. In this case, the user may s ll access the WebDAQ remotely to modify
the start se ngs.

Replacing the ba ery
A bu on cell lithium ba ery provides the me reference for WebDAQ hardware when the device is powered
oﬀ. The average lifespan of the ba ery is approximately 10 years.
Cau on! The discharge of sta c electricity can damage some electronic components. Before removing
the WebDAQ from its housing, ground yourself using a wrist strap or touch the computer chassis orother grounded object to eliminate any stored sta c charge.
1. Power down the WebDAQ device and disconnect the power supply.
2. On the rear panel, remove the Ethernet cable, power cable, SD card, and any USB devices.
3. Remove the #6-32 ground screw.
4. Remove the nut and washer from the EXT PWR connector.
5. Remove the two front panel bezel screws and remove the front bezel.
6. Slide out the circuit board with the front panel intact.
7. Remove the ba ery by sliding it forward toward the slot, and replace with a 3 V lithium coin cell ba ery.
8. Slide the circuit board back into the enclosure.
9. A ach the front bezel and secure with the two bezel screws removed in step 5.
10. Secure the power connector with the nut and washer removed in step 4, to the power connector, a ach theground screw, Ethernet and power cables, and any USB devices.
Set the device system clock from the Device window, Device Info tab on the web interface.

Upda ng WebDAQ ﬁrmware
Device ﬁrmware is bundled with the opera ng system, web server, and documenta on in a so ware update(*.swu) ﬁle. Firmware updates are posted on the Measurement Compu ng Firmware Updates page and areavailable for download.
Use the web interface to install the *.swu update ﬁle. Open a browser window and enter h p://webdaqxxxxxx.local/Help, where xxxxxx is the last 6 digits of the MAC address – see the label on the bo om of theenclosure. Refer to the "Upda ng WebDAQ Firmware" help topic or FAQ for instruc ons.

Calibra ng the hardware
The Measurement Compu ng Manufacturing Test department performs the ini al factory calibra on. Returnthe device to Measurement Compu ng Corpora on when calibra on is required. The recommended calibra oninterval is one year.
Contents

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WebDAQ 504 User's Guide

Speciﬁca ons
All speciﬁca ons are subject to change without no ce.
Typical for 0 °C to 50 °C unless otherwise speciﬁed.

Analog input
Table 1. Analog input speciﬁca ons
Parameter
Number ofchannels
ADC resolu on
Type of ADC
Sampling mode
Internal mastermebase (fM)

Condi onFrequency
Accuracy

Data rate range (fs)
Data rates (fs)
Input couplingAC cutoﬀ
frequency–3 dB–0.1 dB

Input range
AC voltage fullscale range
Common-mode
voltage range
IEPE excita on
current;
so ware-selectable
on/oﬀ
Power-on glitch
IEPE compliancevoltage(Note 1)
Overvoltage
protec on, withrespect to chassis
groundInput delay
Gain driOﬀset driAI– to earth
groundSpeciﬁca on
4 analog input channels
24 bits
Delta-Sigma (with analog preﬁltering)
Simultaneous
13.1072 MHz±50 ppm max
1.652 kS/s min
51.2 kS/s max(fM ÷ 256)/n, where n is any integer from 1 to 31
AC/DC; so ware-selectable
0.5 Hz4.6 Hz max±5 V±5 Vpk min±5.1 Vpk typ±5.2 Vpk max±2 V max
2.0 mA min
2.1 mA typ

90 μA for 10 μs
19 V max

Signal source
connected to AI+
and AI–
Low-impedancesourceconnected to AI+
and AI–±30 V–6 V to 30 V

(40 + 5/512)/fs + 2.6 μs
0.14 mdB/°C (16 ppm/°C) typ0.45 mdB/°C (52 ppm/°C) max
19.2 μV/°C typpage 22

WebDAQ 504 User's Guide

Channel-to-channel
matching

Phase (ﬁn in kHz)Gain

PassbandFrequency
Flatness (fs = 51.2
kS/s)
fs = 51.2 kS/s
Frequency
Rejec onPhase nonlinearity
Stopband
Alias-freebandwidth
Oversample rate
Crosstalk
CMRR
SFDR
Input impedance

1 kHz
ﬁn ≤ 1 kHz
ﬁn = 1 kHz, –60
dBFS
Diﬀeren al
AI– (shield) tochassis ground

118 μV/°C max
ﬁn × 0.045° + 0.04 max
0.01 dB typ
0.04 dB max
0.45 × fs±40 mdB (pk-to-pk max)
±0.45° max
0.55 × fs
100 dB
0.45 × fs
64 × fs–110 dB
40 dB min
47 dB typ120 dB
305 kΩ
50 ΩNote 1. If you are using an IEPE sensor, use this equa on to make sure your conﬁgura on meets the IEPE
compliance voltage range:(Vcommon-mode + Vbias ± Vfull-scale) must be 0 to 19, where:
Vcommon-mode is the common-mode voltage applied to the WebDAQ 504.
Vbias is the bias voltage of the IEPE sensor.
Vfull-scale is the full-scale voltage of the IEPE sensor.
Table 2. Measurement accuracy speciﬁca ons
Measurement
Condi ons
Calibrated Max(0 °C to50 °C)
Typ(25 °C±5 °C)

Percent of Reading(Gain Error)±0.34% (±0.03 dB)

Percent of Range(Oﬀset Error) (Note 2)±0.14% (±7.1 mV)±0.07% (±0.006 dB)±0.01% (±0.5mV)

Note 2. Range = 5.1 Vpk.
Table 3. Idle channel and noise density speciﬁca ons
Idle Channel
Noise
Noise density

51.2 kS/s
97 dBFS
50 µVrms
310 nV/√Hz

25.6 kS/s
99 dBFS
40 µVrms
350 nV/√Hz

page 232.048 kS/s
103 dBFS
25 µVrms
780 nV/√Hz

WebDAQ 504 User's Guide

Table 4. Total harmonic distor on (THD) speciﬁca ons
Input Amplitude
Input amplitude

Condi on
–1 dBFS–20 dBFS

Intermodula on
distor on(–1 dBFS)

DIN 250 Hz/8 kHz
4:1 amplitude ra o
CCIF 11 kHz/12 kHz
1:1 amplitude ra oSpeciﬁca on
1 kHz: –95 dB
8 kHz: –87 dB
1 kHz: –95 dB
8 kHz: –80 dB–80 dB–93 dB

Digital input/output
Table 5. Digital input/output speciﬁca ons
Parameter
Digital type
Number of I/O
Conﬁgura on
Power oncondi ons
Pull-up
conﬁgura on
Input frequency
range
Input high voltage
thresholdInput low voltage
thresholdSchmi trigger
hysteresis
Input high voltage
limit
Input low voltage
limit
Output voltage
range
Output oﬀ state
leakage current
Output sinkcurrent capability
Output transistor
on-resistance(drain to source)

Speciﬁca on
CMOS (Schmi trigger) input / open drain output
One port of 4 bits
Each bit can be independently conﬁgured for input or output
Power on reset is input mode
Each bit is pulled up to 5 V with a 100 kΩ resistor
DC – 10 kHz (Note 3)
1.9 V min, 3.6 V max
2.3 V max, 1.0 V min
0.6 V min, 1.7 V max
15 V max–0.5 V absolute min
0 V recommended min
0 V to +5 V (no external pull up resistor)
0 V to +15 V max (Note 4)
10 µA max
100 mA max (con nuous) per output pin
1.6 Ω

Note 3. Applying a signal with a frequency higher than this speciﬁca on will adversely aﬀect system
performance and could cause errors.

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WebDAQ 504 User's Guide

Note 4. The external pull-up resistor is connected between the digital output bit and an external supply. Adding
an external pull-up resistor connects it in parallel with the internal 100 kΩ pull-up resistor of that par cular
digital input/output bit to the internal 5 V supply. Careful considera on should be made when considering theexternal pull-up resistor value and the resultant pull-up voltage produced at the load.

Network
Ethernet connec on
Table 6. Ethernet connec on speciﬁca ons
Parameter
Ethernet typeCommunica on
rates
Connector
Cable length
Addi onal
parameters

Speciﬁca on
100 Base-TX
10 Base-T
10/100 Mbps, auto-nego ated
RJ-45, 8 posi on
100 meters (328 feet) max
For CE compliance the max length is 3 meters (9.84 feet)
HP Auto-MDIX support

Network conﬁgura on
Table 7. Network conﬁgura on
Parameter
Network IP
conﬁgura on

Network device
nameNetwork namepublica on
User accounts

Speciﬁca on
DHCP, link-local, sta c
DHCP may be disabled by the user and a sta c IP address assigned
If DHCP is enabled but is unsuccessful at obtaining an IP address the device will fallback to link-local and request the IP address 169.254.100.100.
The name used for detec ng the device using mDNS (zero-conf). This name may bechanged using the web interface.
By mDNS
There are two built-in user accounts:
admin
share
These accounts are case-sensi ve and cannot be changed using the web interface.

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WebDAQ 504 User's Guide

Factory default se ngs
Table 8. Factory default se ngs
Parameter
Factory default IP
address
Factory default
subnet mask
Factory default
gateway
Factory default
DHCP se ng
Factory default
admin password
Factory default
share password
Factory default
device nameSpeciﬁca on
192.168.0.101
255.255.255.0
192.168.0.1
DHCP + link-local enabledadmin
Passwords are case sensi ve and can be changed using the web interface.
share
Passwords are case sensi ve and can be changed using the web interface.
webdaq-xxxxxx, where xxxxxx is the last 6 digits of the MAC address (printed on thelabel on the underside of the device).

Note 5. Shared folders and mapped drives are reset when factory defaults are restored.

Processor / Memory
Table 9. Processor / memory speciﬁca ons
Parameter
Microprocessor
MemorySpeciﬁca on
Type: Quad core Broadcom BCM2837
Speed: 1.2 GHz
RAM: 1 GB LPDDR2Flash: 4 GB eMMC (3 GB available for user data storage)

USB ports
Table 10. USB speciﬁca ons
Parameter
Number of USB
ports
USB device type
Devicecompa bility

Speciﬁca on
Two
USB 2.0 (high-speed)
USB 1.1, USB 2.0, USB 3.0

Note 6. The USB ports are provided for connec on to a mass storage device or approved WiFi adapter.

SD memory card slot
Table 11. SD card speciﬁca ons
Parameter
Memory card type
File systems
supported

Speciﬁca on
SD, SDHC, SDXC, MMC, TransFlash
FAT16, FAT32, exFAT, ext2/3/4, NTFS

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WebDAQ 504 User's Guide

LED indicators
Table 12. LED speciﬁca ons – normal opera ng mode
Label
1: POWER

2: STATUS

State
Steady yellow
Steady green
Blinking yellow
Oﬀ
Blinking yellow
Steady green
Flashing green
100 ms on, 2s oﬀ
Blinking heartbeat
Blinking green

3: ERROR

Oﬀ
Blinking yellow

4: MEDIAOﬀ
Blinking yellow
Steady yellow
Blinking green
Steady green
Oﬀ

Descrip on
Device is boo ng up.
Device boot is successful.
Device is shu ng down.
Device is oﬀ.
Device is conﬁguring hardware.
Hardware conﬁgura on is complete.
Wai ng for the schedule start condi on to be met. (Note 7)
The conﬁgured schedule start condi on is met; wai ng for job
start condi on to be met. (Note 7)
The conﬁgured job start condi on is met – the job is running.
(Note 7)
Device is oﬀ.
Error condi on is detected. LED blinks even when the so ware
is conﬁgured to ignore the error.
Error state is cleared on the next schedule start.
No error is detected, or the device is oﬀ
A job is conﬁgured to log to external media, but the job hasn't
started yet; push bu on will not let you eject media.
External media is inserted into the SD card slot or USB storage
port.
Currently logging to an external SD card or USB storage device.
Media has been made safe for removal using the FUNC bu on,
but is s ll inserted in the device.
No external media is detected, or the device is oﬀ.

Note 7. Use the WebDAQ so ware to conﬁgure start and stop se ngs for jobs and schedules.
Table 13. LED speciﬁca ons – so ware update mode
LED
All LEDs
1. POWER
2. STATUS

State
Solid yellow
Blinking yellow
Blinking green
Blinking yellow

3. ERROR

Blinking green
Blinking yellow

Descrip on
So ware update is star ng.
So ware update is running.
Update ﬁle is located; device is being updated.
Update ﬁle cannot be located; insert media containing the
update ﬁle.
Update is successful; device reboot in approximately 5 seconds.
Update failed; user must retry.

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WebDAQ 504 User's Guide

Push bu ons
Table 14. Push bu on speciﬁca ons
Component
Power bu on

Label
POWER

Descrip on
W1 jumper installed (factory default) (Note 8)
When device is oﬀ; press brieﬂy to turn the device on
When device is on:
Press for ~1 second to shuts down the device; release
the bu on when the POWER LED blinks yellow
Press and hold ~4 seconds to force the device to poweroﬀ
W1 jumper removed (Note 8):
Device will always be on if power is applied
Press for ~1 second to reboot the device; release the bu on
when the POWER LED blinks yellow

Func on bu on

FUNC

Dual func on:
Ejects, or safely unmounts, all removable media for safe
removal from the device (default)This func on is disabled when a job that uses external
media is running
The MEDIA LED is steady green when all media isunmounted but s ll inserted in the device
Starts or stops an acquisi on; requires conﬁgura on via
the web interface

Factory reset
bu on

CONFIGRESET

Restores factory default se ngs; refer to the Factory default
se ngs table for values.

Note 8. Refer to this circuit board image for the loca on of the W1 jumper.

Ground connector
Table 15. Ground connector speciﬁca ons
Component
Ground connector

Label
#6-32

Descrip on
Connector port for the #6-32 ground screw

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WebDAQ 504 User's Guide

Power
Table 16. Power speciﬁca ons
Parameter
Input voltage
Input wa age
External power
adapter
Power behavior

Condi ons
Center posi ve
p/n PS9V1AEPS230V(Note 9)W1 jumper
installed(factory default)
W1 jumper
removedBa eryBa eryreplacement

Speciﬁca on
6 VDC to 16 VDC
4 W typ, 10 W max
Phihong PSC15R-090 15 W adapter included. 9 volts, 1.67 amps,
110 VAC to 240 VAC input range required.
So power on using the momentary power bu on; device canturn its power oﬀ to shut down. Device does not resume
opera on if power is lost.
Device is always on if power is applied. Power bu on func ons
only as a reboot bu on.
One 3 V bu on cell lithium ba ery required to maintain me of
day clock when device is powered oﬀ.
Panasonic BR-1225 3V lithium coin cell ba ery or equivalent;user-replaceable.
Refer to the Replacing the Ba ery sec on for the replacement
procedure.

Note 9. If using a diﬀerent supply, ensure that it has a posi ve center pin.

Mechanical
Table 17. Mechanical speciﬁca ons
Parameter
Dimensions(L × W × H)
WeightSpeciﬁca on
158.8 × 146.1 × 38.1 mm (6.25 × 5.75 × 1.50 in.)
178.8 × 146.1 × 38.1 mm (7.04 × 5.75 × 1.50 in.) includes BNC connectors
680 g (1.50 lb)

Shock and vibra on
Table 18. Shock and vibra on speciﬁca ons
Parameter
Shock(IEC 60068-2-27)

Condi ons
Opera onal
Nonopera ng

Random Vibra on(IEC 60068-2-64)

Opera onal
Nonopera ng

Speciﬁca on
30 g peak, half-sine, 11 ms pulse
50 g peak, half-sine, 11 ms pulse
18 shocks at 6 orienta ons
5 to 500 Hz, 0.3 grms
5 to 500 Hz, 2.4 grms

Environmental
Table 19. Environmental speciﬁca ons
Parameter
Opera ng
temperature range
Storagetemperature range
Ingress protec on

Speciﬁca on
0 °C to 50 °C–40 °C to 85 °C
IP30page 29

WebDAQ 504 User's Guide

Opera ng humidity
Storage humidity
Maximum al tude
Pollu on degree

10% to 90% RH, noncondensing
5% to 95% RH, noncondensing
2,000 m (6,562 )2

Note 10. WebDAQ 504 opera on is intended for indoor use only.

Safety voltages
Connect only voltages that are within the limits speciﬁed in this table.
Table 20. Safety speciﬁca ons
Parameter
Voltage limits
Isola onCondi ons
Channel-to-earth
groundChannel-tochannel
Channel-to-earth
groundSpeciﬁca on±30 V max, Measurement Category I
None
None

Measurement Category I is for measurements performed on circuits not directly connected to the electrical
distribu on system referred to as MAINS voltage. MAINS is a hazardous live electrical supply system thatpowers equipment. This category is for measurements of voltages from specially protected secondary circuits.
Such voltage measurements include signal levels, special equipment, limited-energy parts of equipment,
circuits powered by regulated low-voltage sources, and electronics.
Cau on! Do not connect the WebDAQ 504 to signals or use for measurements within Measurement
Categories II, III, or IV.

Signal connector
Table 21. Screw terminal speciﬁca ons
Parameter
Connector types
Terminal wiring

Speciﬁca on
4 BNC connectors
6-posi on screw terminal for digital connec ons
14 to 30 AWG copper conductor wire with 5 to 6 mm (0.20 to 0.24 in.) of insula on
stripped from the end

Screw terminal
Table 22. Screw terminal pinout
Terminal
#
1
2
3

Label
GND
DIO0
DIO1

Terminal
Use
Digital ground
Digital bit 0
Digital bit 1

#
4
5
6

Label
DIO2
DIO3
GND

Use
Digital bit 2
Digital bit 3
Digital ground

BNC connectors
Table 23. BNC connector pinout
Terminal
#
1

Label
AI0+

Terminal
Use
Channel 0 HI#
5page 30

Label
AI2+

Use
Channel 2 HI

WebDAQ 504 User's Guide

2
3
4

AI0–
AI1+
AI1–

Channel 0 LO
Channel 1 HI
Channel 1 LO

6
7
8Contents

page 31

AI2–
AI3+
AI3–

Channel 2 LO
Channel 3 HI
Channel 3 LO

WebDAQ 504 User's Guide

EU Declara on of Conformity
EU Declara on of Conformity
According to ISO/IEC 17050-1:2010
Manufacturer: Measurement Compu ng Corpora on
Address: 10 Commerce Way
Norton, MA 02766
USA
Product Category: Electrical equipment for measurement, control and laboratory use.
Date and Place of Issue: May 31, 2017, Norton, Massachuse s USA
Test Report Number: EMI7018.17
Measurement Compu ng Corpora on declares under sole responsibility that the product
WebDAQ 504
is in conformity with the relevant Union Harmoniza on Legisla on and complies with the essen al
requirements of the following applicable European Direc ves:
Electromagne c Compa bility (EMC) Direc ve 2014/30/EU
RoHS Direc ve (EU) 2015/863 amending Annex II to Direc ve 2011/65/EU
Conformity is assessed in accordance to the following standards:
EMC:
Emissions:
EN 61326-1:2013 (IEC 61326-1:2012), Class A
EN 55011: 2009 + A1:2010 (IEC CISPR 11:2009 + A1:2010), Group 1, Class A
Immunity:
EN 61326-1:2013 (IEC 61326-1:2012), Controlled EM Environments
EN 61000-4-2:2008 (IEC 61000-4-2:2008)
EN 61000-4-3 :2010 (IEC61000-4-3:2010)
EN 61000-4-4 :2012 (IEC61000-4-4:2012)
EN 61000-4-5 :2014 (IEC61000-4-5:2014)
EN 61000-4-6 :2013 (IEC61000-4-6:2013)
EN 61000-4-11:2004 (IEC61000-4-11:2004)
Environmental Aﬀairs:
Ar cles manufactured on or a er the Date of Issue of this Declara on of Conformity do not contain any of therestricted substances in concentra ons/applica ons not permi ed by the RoHS Direc ve.
Carl Haapaoja, Director of Quality Assurance

Contents

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WebDAQ 504 User's Guide

Measurement Compu ng Corpora on
10 Commerce Way
Norton, MA 02766
Phone: 508-946-5100
mccdaq.com/support

page 33