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

Chapter 3 Signal Connections
Pins Signal Name
45 CLKB1
46 OUTB2
47 GATB2
48 CLKB2
49 +5 V
50 DGND
*Indicates that the signal is active low.
AI = Analog Input
AO = Analog Output

Analog Input Signal Connections

Exceeding the input signal range distorts input signals. Exceeding the maximum
Warning
input voltage rating may damage the DAQCard-1200 and the computer. National
Instruments is
DAQCard-1200 User Manual
Direction Reference
DI DGND
DO DGND
DI DGND
DI DGND
DO DGND
N/A N/A
DI = Digital Input DIO = Digital Input/Output
DO = Digital Output N/A = Not Applicable
The connector pins are grouped into analog input signal pins, analog output
signal pins, digital I/O signal pins, timing I/O signal pins, and power
connections. Signal connection guidelines for each of these groups are
described in the following sections.
Pins 1 through 8 are analog input signal pins for the 12-bit ADC. Pin 9,
AISENSE/AIGND, is an analog common signal. You can use this pin as a
signal ground connection to the DAQCard-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, through 4.7 k
series resistances, to the eight single-ended analog input channels of the
input multiplexer. Pins 2, 4, 6, and 8 are also tied to an input multiplexer
for DIFF mode.
The signal ranges for inputs ACH<0..7> at all possible gains are shown in
Table 3-1. Exceeding the input signal range will not damage the input
circuitry as long as the maximum input voltage rating of ±35 V powered on
and ±25 V powered off is not exceeded. The DAQCard-1200 is guaranteed
to withstand inputs up to the maximum input voltage rating.
liable for any damages resulting from such signal connections.
NOT
Clock B1—External control clock signal for counter B1.
Counter B2—Voltage output signal of counter B2.
Gate B2—External control signal for gating counter B2.
Clock B2—External control clock signal for counter B2.
+5 Volts—Fused for up to 1 A of +5 V supply, but limit
current to 250 mA.
Digital Ground—Voltage ground reference for the digital
signals and the +5 V supply.
3-4
Description
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