3-10
Installation and Configuration
KPCI-3110 and KPCI-3116 User’s Manual
Resistors R1 to R16 - bias return
Resistor locations R1 to R16 connect the low side of analog input channels to analog ground.
These resistor locations are typically used when connecting differential inputs to analog input
channels 0 to 15, where R1 corresponds to analog input channel 0, and R16 corresponds to ana-
log input channel 15.
The high side of the corresponding analog input channels returns the source input impedance
through the bias return resistors to the low side of the channels, then to analog ground. Typical
resistor values are 1k
Ω
to 100k
Ω
depending on the application. Refer to
Figure 3-7
for an exam-
ple of using bias return resistors.
Resistors R17 to R32 - current shunt
Resistor locations R17 to R32 are typically used to convert current to voltage on channels 0 to
15, where R17 corresponds to analog input channel 0, and R32 corresponds to analog input
channel 15.
These resistor locations connect the high side to the low side of the corresponding channels,
thereby acting as shunts. If, for example, you add a 250
Ω
resistor to location R17, and connect a
4 to 20mA current loop input to channel 0, the input range is converted to 1 to 5V. Note that,
depending on your application, you may need to use resistors R1 to R16 with resistors R17 to
R32 for proper operation. Refer to
Figure 3-9
for an example of using current shunt resistors.
Screw terminals
Screw terminals TB1 to TB56 correspond to the analog I/O channels from the KPCI-3110 or
KPCI-3116 board. Screw terminals TB57 to TB112 correspond to the digital I/O signals from
the KPCI-3110 or KPCI-3116 board.
Screw terminals TB37 (+15V) and TB39 (
−
15V) are available for low-current signal condition-
ing applications. The supply on the KPCI-3110 or KPCI-3116 board is current-limited through a
10
Ω
resistor and is specified for a maximum load current of ±3mA.
Screw terminal TB49 (+5.0V reference) is also current-limited through a 10
Ω
resistor and is
provided for applications that require a reference less than 1mA.
Screw terminal TB112 (+5V output) is current-limited through a series 10
Ω
resistor and sup-
ports loads up to 100mA. Note that you must take the drop (current [I] multiplied by resistance
[R]) across the series 10
Ω
resistor (1V at 100mA) into consideration.
To provide maximum signal integrity, screw terminals TB35, TB36, and TB51 to TB56 have
been reserved for external shield connections from the J1 connector. Screw terminals TB105 and
TB108 have been reserved for external shield connections from the J2 connector. In addition,
multiple ground connections have been allocated for all the digital and clock signals for proper
shielding and current capacity.
NOTE
If you connect a high-speed clock to the STP-3110, it is recommended
that you connect the return to the adjacent ground screw terminal.
Summary of Contents for KPCI-3110
Page 3: ......
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Page 16: ...Preface...
Page 20: ...1 Overview...
Page 25: ...2 Functional Description...
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Page 61: ...3 Installation and Configuration...
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Page 86: ...4 Testing the Board...
Page 89: ...5 Calibration...
Page 92: ...6 Troubleshooting...
Page 99: ...A Specifications...
Page 111: ...B Connector Pin Assignments...
Page 116: ...C Systematic Problem Isolation...
Page 143: ...D Using Your Own Screw Terminal Panel...
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