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PCI-1002 Series Card
12-bit, 110 kS/s or 44 kS/s Multi-function Board
User Manual, Ver. 3.0, Jun. 2018, PMH-015-30, Page: 16
2.7
AD Input Signal Connection
The PCI-1002 series card can measure either single-ended or differential-type analog input signals.
The user must decide which mode is most suitable for measurement purposes. Please refer to the
Section 2.2 “JP1: AD Input Type Selection”
to see how to configure the JP1 jumper based on your
analog input type.
In general, there are four different analog signal connection methods, as shown in
Figure 2-3
to
Figure 2-7
. The connection shown in
Figure 2-3
is suitable for grounded analog input signals. The
connection shown in
Figure 2-4
is used to measure more channels than that shown in
Figure 2-3
,
but is only suitable for large analog input signals. The connection shown in
Figure 2-5
is suitable for
thermocouple connections and the connection shown in
Figure 2-6
is suitable for floating analog
input signals.
Note: In Figure 2-5, the maximum common mode voltage between the analog input source and the
AGND is 70 V
p-p
, so the user must ensure that the input signals is within this specification. If the
common mode voltage is above 70 V
p-p
, the input multiplexer will be permanently damaged!
The simplest way to select your input signal connection configuration is listed below.
1. Grounding source input signal
see
Figure 2-3
2. Thermocouple input signal
see
Figure 2-5
3. Floating source input signal
see
Figure 2-6
4. If Vin > 0.1 V, gain<=10 and more channels are needed
see
Figure 2-4
5. Current source input signal
see
Figure 2-7
If you are unsure of the characteristics of your input signal, follow these test steps:
Step1: Try and record the measurement results when using
Figure 2-3
.
Step2: Try and record the measurement results when using
Figure 2-6
.
Step3: Try and record the measurement results when using
Figure 2-4
.
Step4: Compare the three results and select the best one.