User`s manual

5.2.7 Isolated Grounds / Differential Inputs
Optimum performance with isolated signal sources is assured with the use of the differential input
setting. Figure 5-10 below shows the recommend connections is this configuration.
Figure 5-10. Isolated Grounds / Differential Inputs
5.3 ANALOG OUTPUTS
Analog outputs are simple voltage outputs which can be connected to any device which will record,
display or be controlled by a voltage. The PCIM-DAS1602/16 analog outputs are 4 quadrant multiplying
DACs. This means that they accept an input voltage reference and provide an output voltage which is
inverse to the reference voltage and proportional to the digital value in the output register.
For example, in unipolar mode, the supplied reference of −5V provides a +5V output (actually 4.9988V)
when the value in the output register is 4095 (full scale at 12 bits of resolution). It provides a value of
2.5V when the value in the output register is 2048.
Figure 5-11 shows the onboard reference internally jumpered. Both D/A outputs will have a range of
−5 to +5 volts. This is the default factory configuration.
18
+
-
Input
Amp
To A /D
A/D Board
I/O
Connector
LL GND
CH High
CH Low


Signal Source
and A/D Board
Already Isolated.
Already isolated signal source
and A/D board connected to
a differential input.
GND
These grounds are
electrically isolated.
10 K
10K is a recommended value. You may short LL GND to CH Low
instead, but this will reduce your system’s noise immunity.