BL4S100 User’s Manual
28
In the differential mode, each individual channel is limited to half the total voltage—for
example, the range for a gain code of 1 is ±20 V, but each channel is limited to 0–20 V.
Note that while the differential bipolar mode can return a negative value, this negative
value can only indicate negative with respect to the two differential voltages since the A/D
converter cannot handle a voltage below -0.2 V.
The A/D converter inputs are factory-calibrated, and the calibration constants are stored in
the user block.
Table 6. A/D Converter Input Voltage Ranges
Amplifier
Gain
Voltage Range
Single-Ended
Unipolar
Differential
Bipolar
1
0–20 V
± 20 V
2
0–10 V
± 10 V
4
0–5 V
± 5 V
5
0–4 V
± 4 V
8
*
0–2.5 V
± 2.5 V
10
0–2 V
± 2 V
16
0–1.25 V
± 1.25 V
20
0–1 V
± 1 V
* 4–20 mA operation is available with an ampli-
fier gain of 8
When using channels AIN0–AIN3 for current
measurements, remember to set the corre-
sponding jumper(s) on headers J10 and J11.
The current measurements are realized by actu-
ally measuring the voltage drop across a 100
resistor.
Figure 12. Analog Current Measurements
100
W
J11
AIN0
AIN1
Apply jumpers
for factory-default
current measurements
J10
AIN2
AIN3
