Analog Input Signal Connections - National Instruments PCI-1200 User Manual

Chapter 3 Signal Connections
Table 3-1. Signal Descriptions for NI PCI-1200 I/O Connector Pins (Continued)
Pin Signal Name
43 OUTB1
44 GATB1
45 CLKB1
46 OUTB2
47 GATB2
48 CLKB2
49 +5V
* Indicates that the signal is active low.
DI = Digital Input

Analog Input Signal Connections

NI PCI-1200 User Manual
Direction
DIO
DI
DI
DO
DI
DI
DO
DO = Digital Output
The connector pins are grouped into AI signal pins, AO signal pins,
DIO signal pins, TIO signal pins, and power connections. The following
sections describe the signal connection guidelines for each of these groups.
Pins 1 through 8 are AI signal pins for the 12-bit ADC. Pin 9,
AISENSE/AIGND, is an analog common signal. You can use this pin for
a general analog power ground tie to the NI PCI-1200 in RSE mode or as a
return path in NRSE mode. Pin 11, AGND, is the bias current return point
for differential measurements. Pins 1 through 8 are tied to the eight
single-ended AI channels of the input multiplexer through 4.7 kΩ series
resistors. Pins 2, 4, 6, and 8 and also tied to an input multiplexer for
DIFF mode.
The signal ranges for inputs ACH<7..0> at all possible gains are shown in
Tables 3-2 and 3-3. Exceeding the input signal range will not damage the
input circuitry as long as the maximum powered-on input voltage rating
Reference
DGND Output B1—Digital output signal of
counter B1 (DO). External control
signal for timing a scan interval (DI).
DGND Gate B1—External control signal for
gating counter B1.
DGND Clock B1—External control clock
signal for counter B1.
DGND Counter B2—Digital output signal of
counter B2.
DGND Gate B2—External control signal for
gating counter B2.
DGND Clock B2—External control clock
signal for counter B2.
DGND +5 Volts—This pin is fused for up to 1 A
of +4.65 to +5.25 V.
N/A = Not Applicable
3-4
Description
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