WBK40

14-Channel Thermocouple Input ModuleFeatures• Add from 14 to 224 thermocouple
inputs to the WaveBook/516E• Provides linearized and cold-junction
compensated readings for all thermocouple types• 1.0 ˚C or better accuracy for mostranges and TC types• Consumes no measurement bandwidth from the WaveBook/516E• Open TC detection per channel• Each TC channel can also be used tomeasure ±100 mV
The WBK40 attaches to any of thethree parallel expansion ports on theWaveBook/516E, and provides 14 thermocouple input channels. Because theWBK40 has a built-in 16-bit, 200 kHz A/Dconverter, thermocouple measurementson the WBK40 do not consume valuable ­sampling time from the WaveBook’s
1 MHz A/D converter. As a result, there
are no speed implications to WaveBookor other WBK ­measurements when theWBK40 is attached.

The WBK40 provides 14 to 224 TC inputs for WaveBook systems

WBK40 Thermocouple Input Module Block Diagram
Mini TC Input amplifierconnector
and filter

16-bit,200-kHz
A/D converter

14 channels per module

WBK40 System Example

Parallel interface
to WaveBook/516ECold junctionsensor

ANALOGCOMMONANALOG TRIGGER
CH1CH2CH3CH4CH5CH6CH7CH8PULSE TRIGGER

DIGITAL I/O
EXTERNAL CLOCKTTL TRIGGER

ACTIVESYNC toWaveBook/516E

Auto-zerochannel

WaveBook/516E

READY
POWER
MADE IN U.S.A.

WBK40

DBK84

P1
to optional DBK84
14-channel TC
expansion modules

DBK84

The 14 built-in TC channels on the WBK40
can accept any type of thermocouple,
including types J, K, S, T, E, B, R, M, andN mini-TC connections on the front ofthe WBK40 make it quick and easy toattach thermocouples. The WBK40 canbe expanded in 14-channel increments
using the DBK84 TC expansion module. Atotal of 15 DBK84s can be attached to one
WBK40, for a total TC channel capacity of224 channels.
Built into the WBK40 is a 16-bit, 200 kHz A/D
converter that samples all of the TC inputs,
including inputs attached to the DBK84
Measurement Computing

expansion modules. The SYNC connection
between the WBK40 and WaveBook/516E
insure that thermocouple measurements on
the WBK40 are synchronized with higherspeed measurements on the ­WaveBook.
WaveBook ­software automatically accomodates for the difference in sampling rates between the WaveBook and WBK40, insuringthat there is exact time correlation between
readings from both devices.

(508) 946-5100

1The WBK40 automatically performs thermocouple linearization and cold-junction
compensation, providing accurate andstable temperature readings in either ˚C,˚F, or ˚K. Typical TC accuracy is better than
1.0 ˚C, with channel-to-channel variationand noise typically better than 0.2 ˚C.

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WBK40Specifications & Ordering Information
In synchronous master/slave systems orwhen using a WBK40 module, it is possible
to run the slave units at a slower clock
rate than that of the master device in thesystem. This configuration may be necessary when it is desirable to have a systems
which has signals that need to be sampled
at widely varying rates while remaining
time synchronous to the master unit.
When such a configuration exists the master
unit is connected to the slave or WBK40 via
the SYNC ports. The SYNC ports allow themaster unit to pass its trigger and acquisition clock signals to the slave devices. Whenthe slave devices receive the clock they can
divide the master clock by 1 to 65,535 todetermine their own acquisition clock rate.
Each slave can be programmed to a clock
divider independent of other slave units
in the system. For example, suppose thata high speed system is configured with 8
accelerometers on the master WaveBook
system but we also need to scan 8 muchslower moving temperature using a WBK40.
In this example, suppose the 8 accelerometerchannels are scanned at 100 kHz each while
we need to only scan the WBK40 temperature channels at 10 kHz. Here, since we wish
to scan the temperature channels 10 times
slower than the accelerometer channels,
the WBK40 clock divider would be set to10. This configuration results in the 8 accelerometer channels to be scanned every
10 µs while the temperature channels on
the WBK40 will be scanned every 100 µs.

Specifications
GeneralSupply Voltage Range: 10 to 30 VDCPower Available for DBK84 Expansion Options:±15V @ 500 mA, +5V @ 1000 mA; up to eight DBK84
options can be powered from the WBK40; for applications with 9 to 15 options, a DBK32A must beadded to the system
Operating Temperature: 0 to +50 ˚C
Storage Temperature: -40 to +80 ˚C
Relative Humidity: 0 to 95%, non-condensing
Vibration: MIL STD 810E
System Connector: DB37 male for P1
TC/mV Connector: Mini-TC connectors
Dimensions: 285 mm W x 220 mm D x 70 mm H
(11” x 8.5” x 2.70”)
Weight: 1.6 kg (3.5 lbs)

Type Min
J-200
K-200
T-200
E-270
S-50
R-50
B50
N28 -270
N140TC Accuracy at Measurement Temperature in ˚C (±˚C)
Max -1000100 300 500 700 900 1100 1400
760 0.8
0.7
0.7
0.8
0.90.9———1200 0.9
0.8
0.8
0.9
1.1
1.1
1.21.3—400 0.9
0.8
0.80.8—————650 0.8
0.7
0.7
0.7
0.8
—
—
—
—
1768
—
3.1
2.4
2.0
2.0
1.9
2.0
2.1
2.1
1768
—
3.1
2.1
2.0
1.9
1.9
1.7
1.9
2.01780
—
—
—
4.9
3.2
2.8
2.4
2.3
2.0
400 1.2
0.9
0.9
0.9
—
—
—
—
—
1300
—
0.9
0.9
0.9
1.1
1.1
1.2
1.3
—

A/D Specifications
Type: Successive approximation
Resolution: 16 bit
Conversion Time: 5 µs
Maximum Sample Rate: 200 kHz
Nonlinearity (Integral): ±1 LSB
Nonlinearity (Differential): No missing codes

Thermocouple Inputs
Functions: TC types J, K, S, T, E, B, R, N; x100 (voltage)
Inputs: 14 differential TC/mV inputs
Input Voltage Range: ±100 mV
Input Impedance: 40M Ohm (differential)
Input Bandwidth: 4 Hz
Input Bias Current: 10 nA typ
CMRR: 100dB typ
Maximum Working Voltage (signal + commonmode): ±10V
Over-Voltage Protection: ±40V
Voltage Accuracy: ±(0.2% of rdg +50 µV)
TC Accuracy: Valid for one year, 18 to 28 ˚C,
see table above
Minimum Resolution: 0.1 ˚C for all TC types

Input Sequencer
Scan Clock Sources: 2
1. Internal, programmable from 5 µs to 5.96 hours
in 5 µs steps*
2. External, TTL level input up to 200 kHz max
Depth: 512 locations
Channel-to-Channel Scan Rate: 5 µs per channel,
programmable
Data Buffer: 64 Ksample FIFO

External Acquisition Scan Clock
Input
Maximum Rate: 200 kHz
Clock Signal Range: 0V to +5V
Minimum Pulse Width: 50 ns high, 50 ns low
External SYNC Port: Available on rear panel, allows
WBK40 to be synchronized with a WaveBook/516E

Note: The WBK40 and WBK41 are not currently supported in WaveView. We recommend using DASYLab®
when using these modules, which includes full support for the WBK40/41. The WBK40/41 are also supported in LabVIEW®, and DaqCOM. If it is necessary to use these modules in conjunction with a WaveView
application, then it is necessary that a second, concurrent application be launched to acquire data from theWBK40/41 into separate data files.

Measurement Computing(508) 946-5100

2Ordering Information
Description
14-channel thermocouple input module
for the WaveBook/516E
14-channel expansion module
for the WBK40
56-channel thermocouple input module

Part No.
WBK40
DBK84
DBK90

Accessories & Cables
Rack mount kit
RackDBK4
Expansion cable for connecting
DBK84 options; specify numberof DBK84 options (x) to be connectedCA-37-x
Expansion cable for connecting
to DBK expansion products,
2.5 in expansion cableCA-37-1T
4.5 in expansion cableCA-37-3T
5.5 in expansion cableCA-37-4T
11.5 in expansion cableCA-37-8T
SYNC cable for multiunit
synchronization; 1 ft.
CA-74-15-pin male DIN to 5-pin male DIN
provides convenient connection
between WBK40 power input
connectors and battery packs
CA-1155-pin DIN to automobile cigarette
lighter power cable, 8 ft.
CA-116

Male Connectors for
Subminiature TC Jacks
Type J male connector
Type K male connector
Type T male connector

CN-144-JM
CN-144-KM
CN-144-TM

Product Compatibility✔ WaveBook* Clock does not apply when SYNC’d to a WaveBook

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