DBK202, DBK203, DBK204 Series
For Analog I/O, Digital I/O, & Pulse/Frequency

Overview …… 2
Connection Tips…… 4
Using Screw-Terminal Blocks …… 6
Using the P3 Header …... 11
Adding Resistor/Capacitor
Filter Networks …… 12

P4-to-P1 / P2 / P3 Adapters
For Use with DaqBook/2000 Series or
DaqBoard/2000 Series Devices

DBK203A, Rear Panel

DBK

Decription

DBK202Screw-terminal adapter board. Board only, no chassis.

DBK203Screw-terminal adapter module with pull-out drawer. Superseded by DBK203A.

DBK203A

Screw-terminal adapter module (supersedes DBK203). DBK203A is the most popular ofthese 5 DBK options.

DBK204

DBK203A plus CA-209 CE cable kit. DBK204 units shipped prior to the release of
DBK203A use a DBK203.

DBK204c

DBK203A plus CA-209c CE cable kit. For use with compact PCIs and DaqBoard/2000c
Series boards. DBK204c units shipped prior to the release of DBK203A use a DBK203.

Each of these units includes:(a) P1, Analog Input, DB37 connector(b) P2, Digital I/O DB37 connector(c) P3, internal 40-pin header, for Digital I/O and Analog Out. The 40-pin header connects to a
Pulse/Frequency DBK card, or to a module’s P3 connector via a
CA-60 cable. These cables have a 40-pin female connector at one end and a DB37 (37-pin)male connector at the other end.
(d) P4, 100-pin connector which includes all signals found in P1, P2, and P3, collectively.
(e) Internal, on-board, screw-terminal blocks which correlate with P1, P2, and P3(f) Internal, on-board socket locations for custom RC Filter networks

Reference Notes:
In regard to calculating system power requirements refer to the DBK Basics section.
Chapter 2 includes pinouts for P1, P2, P3, and P4. Refer to pinouts applicable to yoursystem, as needed.
For a quick comparison of all DBK200 Series boards, refer to the DBK200 Series Matrix.
The matrix is located just before the DBK200 section.
Refer to the DaqBoard/2000 Series User’s Manual (p/n 1033-0901) or the
DaqBook/2000 Series User’s Manual (p/n 1103-0901) for information pertaining
to those products, as needed.
The DBK213, /214, and /215 sections contain information on devices which are closely
related to DBK203A.

DBK Option Cards and Modules

938994

DBK202, DBK203, and DBK204 Series, pg. 1

Overview
The various part numbers [DBK202, /203, /203A, /204, and /204c] of these closely related products aredescribed in the table on page 1. With exception of the DBK202 being a “board only,” the layout for eachis as indicated in the following figure.

DBK203A, Cover Plate Removed*

Custom RC Filter Setup is discussed in the section entitled, Adding Resistor/Capacitor Filter
Networks, page 12.

** To remove the cover plate, remove the upper inside screw from each of the corner mounting
brackets (often referred to as protective ears); then lift the plate from the unit.
The information included in this section, when combined with that found in related DBK card and DBK
module sub-sections should enable you to set up your desired configuration.
It is important to note that the DaqBoard/2000 Series boards communicate [external from the host PC]
through a 100-pin P4 connector. The P1, P2, and P3 connectors discussed in association with these boards
are subset connectors of the 100-pin P4 connector. Certain DaqBook/2000 Series devices have both a P4
connector and a set of P1, P2, and P3 connectors on the unit. The System Connections and Pinouts chapter
includes pinouts for both types of devices, i.e., boards and “books.”
Each of the adapters discussed in this section provide a DB37 P1 connector, DB37 P2 connector, and a
40-pin “on-board” P3 header.
ooooP1 is used for Analog Input
P2 for Digital I/O
P3 for Pulse/Frequency (Digital and Counter/Timer) I/O
P4 includes all signals found in P1, P2, and P3

In addition to these four connectors, each device includes terminal blocks designated TB1 through TB12.
The screw terminal blocks tie-in to P1, P2, and P3 and provide for easy signal connection.
pg. 2, DBK202, DBK203, and DBK204 Series

938994

DBK Option Cards and Modules

Screw-Terminal Adapter Board
The DBK202 Board provides a means of connecting channel input signals to a /2000 Series device throughone of three methods:•

With cables connected to P1, P2, and P3 connectors, as applicable.

•

With signal wires connected to the appropriate screw-terminal blocks (TB1 through TB12).
Note that the DBK202 board’s silkscreen clearly identifies all screw terminals.

•

With a combination of the above two methods.

When connecting a DBK202 to a P4 connector, a CA-195 cable is used. The cable has a P4 connector
located at each end.
Note: DBK202 contains mounting holes that allow the board to be secured inside a user-provided
enclosure.

Screw-Terminal Adapter Modules
The DBK203, DBK203A, DBK204, and DBK204c each consist of a DBK202 board housed in a chassis.
The DBK203 [and DBK204 and DBK204c units that use it] include a card drawer that can be slid free ofthe module. The sliding card drawer provides easy access to the twelve terminal blocks and to the 40-pin
P3 header. The DBK203A (which supersedes the DBK203) and the DBK204 and DBK204c units which
use the DBK203A have no slide out drawer.

DBK203 Includes a Slide-Out DBK202 Board
DBK203A has no Slide-Out Option

Reference Note for Custom RC Filter Setup:
You can install resistors and capacitors to create RC networks for P1 Analog Input Channels.
For detailed information, refer to Adding Resistor/Capacitor Filter Networks, which begins on
page 12 of this DBK section.

DBK Option Cards and Modules

938994

DBK202, DBK203, and DBK204 Series, pg. 3

Connection Tips
CAUTION
Turn off power to the host PC and externally connected equipment prior to connecting
cables or signal lines to the DBK. Electric shock or damage to equipment can result
even under low-voltage conditions.
Take ESD precautions (packaging, proper handling, grounded wrist strap, etc.)
Use care to avoid touching board surfaces and onboard components. Only handle
boards by their edges (or ORBs, if applicable). Ensure boards do not come into
contact with foreign elements such as oils, water, and industrial particulate.
Do not confuse connectors. Ensure that you only connect P1 I/Os to P1, P2 I/Os to P2,
and P3 I/Os to P3. Improper connection may result in equipment damage.
Be sure to align the P4 orientation indicators () prior to mating the P4 connectors.

Example of a DBK202 Connected to Analog and Digital DBK Cards via P1 and P2, Respectively

The illustrations and actual board silkscreen are the only references you should need to make proper
connections.
A list of connection tips follows:
1.

Ensure power is removed from the device(s) to be connected.

2.

Observe ESD precautions when handling the board and making connections.

3.

Do not make redundant connections. For example, for ANALOG IN you can use the P1(DB37) connector or Terminal Blocks TB9 through TB12. You would not use both sets of
ANALOG IN connectors.

4.

There is no need to access the board within a DBK203, DBK203A, DBK204, or DBK204c
unless you need to make connections to P3 or to a terminal block.

pg. 4, DBK202, DBK203, and DBK204 Series

938994

DBK Option Cards and Modules

5.

The board’s 100-pin P4 connector connects to the DaqBoard/2000 P4 connector via a
CA-195 Cable.

6.

To obtain maximum protection from static, connect the CHASSIS terminal to earth ground.

Notes: Regarding connections to DB37 connectors and to the P3 (40-pin) header:(a) P1 connects to an analog DBK card or module’s P1 connector via a CA-37 cable.
(b) P2 connects to a Digital DBK card or module’s P2 connector via a CA-37 cable.
(c) The 40-pin header (P3) connects to a Pulse/Frequency DBK card, or to a module’s
P3 connector via a CA-60 cable. Note that CA-60 cables have a 40-pin female
connector at one end and a DB37 (37-pin) male connector at the other end.
7. To access the board, i.e., to connect to P3 or to terminal blocks:a) DBK202 – access of the board is direct, or as determined by your own custom
enclosure.
b) DBK203 – Loosen the two thumbscrews on the front panel and slide the card
drawer free of the unit.
c) DBK203A – Remove the upper inside screw from each of the four corner brackets(see figure, page 2) and lift the cover plate from the unit.
d) DBK204 and DBK204c – Follow step 2b or 2c as applicable to your unit.

8. For DBK204 and DBK204c refer to the separate CE Cable Kit instructions that are included
with the associated CE cable kit.

Example of a DaqBoard/2000 System using a DBK203 (or DBK203A)DBK Option Cards and Modules

938994

DBK202, DBK203, and DBK204 Series, pg. 5

Using Screw-Terminal Blocks
CAUTION
Turn off power to the host PC and externally connected equipment prior to connecting cables orsignal lines to the DBK. Electric shock or damage to equipment can result even under low-voltage
conditions.
Take ESD precautions (packaging, proper handling, grounded wrist strap, etc.)
Use care to avoid touching board surfaces and onboard components. Only handle boards by theiredges (or ORBs, if applicable). Ensure boards do not come into contact with foreign elements
such as oils, water, and industrial particulate.
Do not confuse connectors. Ensure that you only connect P1 I/Os to P1, P2 I/Os to P2, and P3
I/Os to P3. Improper connection may result in equipment damage.
Be sure to align the P4 orientation indicators () prior to mating the P4 connectors.

1.

Review the preceding CAUTIONS and the P4 alignment note.

2.

Access the terminal blocks:a) DBK202 – access of the board is direct, or as determined by your own custom
enclosure.
b) DBK203 – Loosen the two thumbscrews on the front panel and slide the card
drawer free of the unit.
c) DBK203A – Remove the upper inside screw from each of the four corner brackets(see figure, page 2) and lift the cover plate from the unit.
d) DBK204 and DBK204c – Follow step 2b or 2c as applicable to your unit.

3.

Make the wiring connections to the terminals. Refer to the board’s silkscreen and to the pincorrelations on the next few pages.

4.

Tighten the terminal block screws snug. Do not over-tighten.

In general, the following terminal block-to-signal relationships apply:o TB9, TB10, TB11, and TB12 are used for ANALOG IN and provide a connection
option to the P1 (DB37) connector.
o TB5, TB6, TB7, and TB8 are used for DIGITAL I/O and provide a connection
option to the P2 (DB37) connector.
o TB1, TB2, TB3, and TB4 are used for Pulse/Frequency/Digital I/O and provide aconnection to the 40-pin header (P3).

pg. 6, DBK202, DBK203, and DBK204 Series

938994

DBK Option Cards and Modules

The following pages correlate the DBK202 terminal block connectors with the associated pins of
the P1, P2, and P3 DB37 connectors. Note that the System Connections and Pinouts chapter
contains additional pin-outs, and includes references to the 100-pin P4 connector.

P4 (100 pins)

P2 (37-pins)

P1 (37-pins)

P3 40-pin
Header

DBK202 BoardDBK Option Cards and Modules

938994

DBK202, DBK203, and DBK204 Series, pg. 7

Correlation to P1 – Pertains to Terminal Blocks TB9, TB10, TB11, and TB12 for Analog I/O.
TB9
DIFF
SE
0H
0
0L
8
1H
1
1L
9
2H
2
2L
10
3H
3
3L
11
FILT CAP LO
SGND
TB10
DIFF
SE
4H
4
4L
12
5H
5
5L
13
6H
6
6L
14
7H
7
7L
15
FILT CAP LO
SGND

P1 Pin Number and Description (see Note 1)
37
18
36
17
35
16
34
15
N/A
19

CH 0 IN (Single-Ended Mode) / CH 0 HI IN (Differential Mode)
CH 8 IN (Single-Ended Mode) / CH 0 LO IN (Differential Mode)
CH 1 IN (Single-Ended Mode) / CH 1 HI IN (Differential Mode)
CH 9 IN (Single-Ended Mode) / CH 1 LO IN (Differential Mode)CH 2 IN (Single-Ended Mode) / CH 2 HI IN (Differential Mode)
CH 10 IN (Single-Ended Mode) / CH 2 LO IN (Differential Mode)
CH 3 IN (Single-Ended Mode) / CH 3 HI IN (Differential Mode)
CH 11 IN (Single-Ended Mode) / CH 3 LO IN (Differential Mode)
For RC filter networks install a wire jumper between the relevant FILT CAP LO and
AGND. Note that there is no association between FILT CAP LO and P4.
Signal Ground, Sense Common; reference ground, not for general use.

P1 – TB9

P1 Pin Number and Description (see Note 1)
33
14
32
13
31
12
30
11
N/A
19

CH 4 IN (Single-Ended Mode) / CH 4 HI IN (Differential Mode)
CH 12 IN (Single-Ended Mode) / CH 4 LO IN (Differential Mode)
CH 5 IN (Single-Ended Mode) / CH 5 HI IN (Differential Mode)
CH 13 IN (Single-Ended Mode) / CH 5 LO IN (Differential Mode)
CH 6 IN (Single-Ended Mode) / CH 6 HI IN (Differential Mode)
CH 14 IN (Single-Ended Mode) / CH 6 LO IN (Differential Mode)
CH 7 IN (Single-Ended Mode) / CH 7 HI IN (Differential Mode)
CH 15 IN (Single-Ended Mode) / CH 7 LO IN (Differential Mode)
For RC filter networks install a wire jumper between the relevant FILT CAP LO and
AGND. Note that there is no association between FILT CAP LO and P4.
Signal Ground, Sense Common; reference ground, not for general use.

TB11
TTL TRIG
A/I CLK
EXP 5
EXP 6
EXP 7
EXP 8
EXP 9
EXP 10
EXP 11AGND

P1 Pin Number and Description
25
TTL Trigger, Digital IN, External TTL Trigger Input
20
A/I Clock, External ADC Pacer Clock Input/ Internal ADC Pacer Clock Output
5
Expansion 5. Digital OUT, external GAIN select bit 1
6
Expansion 6. Digital OUT, external GAIN select bit 0
3
Expansion 7. Digital OUT, external ADDRESS, select bit 3
22
Expansion 8. Digital OUT, external ADDRESS, select bit 2
4
Expansion 9. Digital OUT, external ADDRESS, select bit 1
23
Expansion 10. Digital OUT, external ADDRESS, select bit 026
Expansion 11. Simultaneous Sample and Hold (SSH)*
Analog Ground, Common

TB12
AGND
AGND
AGND
AGND
AGND
AGND
+ 15 V- 15 V
AGND+5V

P1 Pin Number and Description*
Analog Ground, Common*
Analog Ground, Common*
Analog Ground, Common*
Analog Ground, Common*
Analog Ground, Common*
Analog Ground, Common
21
Expansion, +15 V Power
2
Expansion, -15 V Power*
Common Ground1
Expansion, +5 V PowerP1 – TB10

P1 – TB11

P1 – TB12*Refer to Ground Correlation Tables in the System Connections and Pinouts chapter.

Note 1: For TB9 and TB10, the filter network portion of the silkscreen is not shown. Instead, the DIFF and SE channel
identifiers have been moved next to the screws for ease in identification.
pg. 8, DBK202, DBK203, and DBK204 Series

938994

DBK Option Cards and Modules

Correlation to P2 – Pertains to Terminal Blocks TB5, TB6, TB7, and TB8 for Digital I/O.
TB5
DGND
DGND
A7
A6
A5
A4
A3
A2
A1
A0

P2 Pin Number and Description*
Digital Ground, Common*
Digital Ground, Common
30
Digital I/O: P2, Digital Port A, Bit 7; or P2 Expansion Data Bit 15
31
Digital I/O: P2, Digital Port A, Bit 6; or P2 Expansion Data Bit 14
32
Digital I/O: P2, Digital Port A, Bit 5; or P2 Expansion Data Bit 13
33
Digital I/O: P2, Digital Port A, Bit 4; or P2 Expansion Data Bit 12
34
Digital I/O: P2, Digital Port A, Bit 3; or P2 Expansion Data Bit 11
35
Digital I/O: P2, Digital Port A, Bit 2; or P2 Expansion Data Bit 10
36
Digital I/O: P2, Digital Port A, Bit 1; or P2 Expansion Data Bit 9
37
Digital I/O: P2, Digital Port A, Bit 0; or P2 Expansion Data Bit 8

TB6
+5 V
+5 V
DGND
DGND
DGND
DGND
DGND
DGND
DGND
DGND

P2 Pin Number and Description
18
Expansion +5 V Power
20
Expansion +5 V Power*
Digital Ground, Common*
Digital Ground, Common*
Digital Ground, Common*
Digital Ground, Common*
Digital Ground, Common*
Digital Ground, Common*
Digital Ground, Common*
Digital Ground, Common

TB7
DGND
DGND
C7
C6
C5
C4
C3
C2
C1
C0

P2 Pin Number and Description*
Digital Ground, Common*
Digital Ground, Common
22
Digital I/O: P2, Digital Port C, Bit 7; or P2 Expansion Data Bit 7
23
Digital I/O: P2, Digital Port C, Bit 6; or P2 Expansion Data Bit 6
24
Digital I/O: P2, Digital Port C, Bit 5; or P2 Expansion Data Bit 5
25
Digital I/O: P2, Digital Port C, Bit 4; or P2 Expansion Data Bit 4
26
Digital I/O: P2, Digital Port C, Bit 3; or P2 Expansion Data Bit 3
27
Digital I/O: P2, Digital Port C, Bit 2; or P2 Expansion Data Bit 2
28
Digital I/O: P2, Digital Port C, Bit 1; or P2 Expansion Data Bit 1
29
Digital I/O: P2, Digital Port C, Bit 0; or P2 Expansion Data Bit 0

TB8
DGND
DGND
B0
B1
B2
B3
B4
B5
B6
B7

P2 Pin Number and Description*
Digital Ground, Common*
Digital Ground, Common
10
Digital I/O: P2, Digital Port B, Bit 0; or P2 Expansion READ Output
9
Digital I/O: P2, Digital Port B, Bit 1; or P2 Expansion WRITE Output
8
Digital I/O: P2, Digital Port B, Bit 2; or P2 Expansion RESET Output
7
Digital I/O: P2, Digital Port B, Bit 3; or P2 Expansion Address Bit 4 Out
6Digital I/O: P2, Digital Port B, Bit 4; or P2 Expansion Address Bit 3 Out
5Digital I/O: P2, Digital Port B, Bit 5; or P2 Expansion Address Bit 2 Out
4Digital I/O: P2, Digital Port B, Bit 6; or P2 Expansion Address Bit 1 Out
3Digital I/O: P2, Digital Port B, Bit 7; or P2 Expansion Address Bit 0 Out

P2 – TB5

P2 – TB6

P2 – TB7

P2 – TB8* Refer to Ground Correlation Tables in the System Connections and Pinouts chapter.

DBK Option Cards and Modules

938994

DBK202, DBK203, and DBK204 Series, pg. 9

Correlation to P3 – Pertains to Terminal Blocks TB1, TB2, TB3, and TB4 for Pulse/Frequency/Digital I/O.
TB1

P3 Pin Number and Description

D0

10

P3 Digital Port Bit 0

D1

9

P3 Digital Port Bit 1

D2

8

P3 Digital Port Bit 2

D3

7

P3 Digital Port Bit 3

D4

6

P3 Digital Port Bit 4

D55

P3 Digital Port Bit 5

D64

P3 Digital Port Bit 6

D7

3

P3 Digital Port Bit 7

DGND

*

Digital Ground, Common

+5V

20

Expansion, +5 Volt Power

TB2

P3 Pin Number and Description

D829

P3 Digital Port Bit 8

D928

P3 Digital Port Bit 9

D10

27

P3 Digital Port Bit 10

D11

26

P3 Digital Port Bit 11

D12

25

P3 Digital Port Bit 12

D13

24

P3 Digital Port Bit 13

D14

23

P3 Digital Port Bit 14

D15

22

P3 Digital Port Bit 15

DGND

*

Digital Ground, Common

DGND

*

Digital Ground, Common

TB3

P3 – TB1

P3 – TB2

P3 Pin Number and Description

CH0 (DAC0)34

Analog Out; Analog DAC 0 Output

AGND

*

Analog Ground, Common; intended for use with DACs

EXP 0 (DAC2)

32

Analog Out; Analog DAC 2 Output

AGND

*

Analog Ground, Common; intended for use with DACs

CH1 (DAC1)

33

Analog Out; Analog DAC 1 Output

A/O CLK

21

Analog Out Clock; External DAC Pacer Clock Input/
Internal DAC Pacer Clock Output

EXP 1 (DAC3)

31

Analog Out; Analog DAC 3 Output

DGND

*

Digital Ground, Common

+15 V

19

Expansion, + 15 VDC

37Expansion, -15 VDC

P3 – TB3-15 V
TB4

P3 Pin Number and Description

EXP 2

12

Reserved

EXP 3

13

Reserved

EXP 4

14

Reserved

TMR 0

15

P3 Timer 0 Output

TMR 1

16

P3, Timer 1 Output

CNT 3

35

P3 Counter 3 Input

CNT 2

17

P3 Counter 2 Input

CNT 1

36

P3 Counter 1 Input

CNT0

18

P3 Counter 0 Input

DGND

*

Digital Ground, Common

P3 – TB4* Refer to Ground Correlation Tables in the System Connections and Pinouts chapter.

pg. 10, DBK202, DBK203, and DBK204 Series

938994

DBK Option Cards and Modules

Using the P3 Header
CAUTION
Disconnect the DBK202, DBK203, DBK203A, DBK204, or DBK204c from power andfrom signal sources prior to connecting the CA-60 cable to the 40-pin header.
Take ESD precautions (packaging, proper handling, grounded wrist strap, etc.)
Use care to avoid touching board surfaces and onboard components. Only handle
boards by their edges (or ORBs, if applicable). Ensure boards do not come into
contact with foreign elements such as oils, water, and industrial particulate.
Do not confuse connectors. Ensure that you only connect P1 I/Os to P1, P2 I/Os to P2,
and P3 I/Os to P3. Improper connection may result in equipment damage.

P3 40-Pin Header
If you need a DB37 connector
for P3, connect a CA-60 cableto this 40-pin header.

The P3 Corner Section of a DBK202

The P3 40-pin header can be used to obtain a DB37 type connector via a CA-60 cable.
To make a DB37 connector available for P3:
1.

Follow the preceding CAUTIONS and ensure power is removed from the system devices.

2.

Access the terminal blocks:a) DBK202 – access of the board is direct, or as determined by your own custom
enclosure.
b) DBK203 – Loosen the two thumbscrews on the front panel and slide the card
drawer free of the unit.
c) DBK203A – Remove the upper inside screw from each of the four corner brackets(see figure, page 2) and lift the cover plate from the unit.
d) DBK204 and DBK204c – Follow step 2b or 2c as applicable to your unit.

3.

Connect the CA-60 cable to the 40-pin header.

4.

Return the system to normal operation.

Reference Note:
There is no direct pin-to-pin correlation between the pins on the header and those on the
DB37 connector. For P3 pinout information refer to chapter 2, System Connections andPinouts.

DBK Option Cards and Modules

938994

DBK202, DBK203, and DBK204 Series, pg. 11

Adding Resistor/Capacitor Filter Networks
WARNING
Disconnect the DBK202, DBK203, DBK203A, DBK204, or DBK204c from power andfrom signal sources prior to installing capacitors or resistors.

CAUTION
Ensure wire strands do not short power supply connections (+15 V, -15 V, +5 V, etc.) to
any terminal potential. Failure to do so could result in damage to DaqBook/2000 Series
devices, DaqBoard/2000 Series boards, or DaqBoard/2000c Series boards.
Do not exceed maximum allowable inputs (as listed in product specifications). There
should never be more than 30 V with reference to analog ground (AGND) or earth
ground.
Do not operate DBK202 on an exposed metal surface.
You must provide strain-relief (lead slack) to all leads leaving DBK202, /203, /203A,/204, or /204c. Use tie-wraps [not included] to secure strain-relief.
Always connect the CHASSIS terminal to earth ground. This will maximize static
protection.
You can install customized RC filter networks to improve the signal-to noise ratio when an unacceptablelevel of noise exists. DBK202, /203, /203A, /204, and /204c include sockets for installing RC filter
networks directly on the board.
The following table contains values that are typical for RC filter network components.

Typical One-Pole Low Pass Filter Values
for DBK202, DBK203, DBK203A, DBK204, and DBK204c

R
Ohms
510
510
510
510
510
510
510
510
470

pg. 12, DBK202, DBK203, and DBK204 Series

C
µF
1
0.47
0.22
0.1
0.047
0.022
0.01
0.00470.0033938994fHertz (-3dB)
312
664
1419
3122
6643
14192
31223
66431
102666f
kHz (-3dB)
0.31
0.66
1.42
3.12
6.64
14.19
31.22
66.43
102.67

DBK Option Cards and Modules

An Example of Customer-Installed Capacitors and Filters for RC Networks on a DBK202
Prior to installing RC components, review the previous WARNING and CAUTION statements; then readover the following information regarding resistors and capacitors.

• Do not use RC filters in conjunction with additional DBK expansion accessories.
• Prior to installing a resistor to the filter network you must drill a 1/16” hole throughthe center pinhole [beneath the board’s silkscreen resistor symbol] as indicated in theabove figure. Failure to do so will short-circuit the resistor.
• Do not drill holes on the board for channels, unless those channels are to receive afilter network (see preceding statement).
• Resistors should be ¼ watt, film-type with up to 5% tolerance. Do not use wirewound resistor types.
• A resistor value of 510 Ω is recommended. Do not exceed 510 Ω.
• Capacitors used are to be of the film dielectric type (e.g., polycarbonate or
NPO ceramic), above 0.001 µF.
• RECOMMENDED: For reduction of both Common Mode Noise and Differential
Mode Noise, use one capacitor between Channel High and AGND; and use a second
capacitor between Channel Low and AGND.
• For reduction of Differential Noise [when no reduction of Common Mode Noise isneeded] position a capacitor across the respective Channel High and Channel Low.
• When in Differential Mode, using capacitors between Channel High, Channel Low,
and AGND may cause a slight degradation of wideband Common Mode rejection.
• When making a RC filter network, always install a wire jumper between the relevant
FILT CAP LO and AGND. FILT CAP LO terminals are located on TB9 and TB10.

DBK Option Cards and Modules

938994

DBK202, DBK203, and DBK204 Series, pg. 13

pg. 14, DBK202, DBK203, and DBK204 Series

938994

DBK Option Cards and Modules