Technical data

Application Examples 5
U1401A User’s and Service Guide 109
4 Connect the red and black alligator leads to the positive
and negative output terminals respectively.
5 Connect the operational amplifier as shown in
Figure 5- 13.
6 Use a DC power supply with +15 V and –15 V outputs to
power the operational amplifier.
7 Feed a constant current of +00.000 mA into the
operational amplifier and measure the offset voltage, V
o
.
8 Gradually increase the U1401A output current from
+00.000 mA to +12.000 mA while monitoring the output
voltage of the operational amplifier. The V
o
value will
increase correspondingly from around 00.000 V to around
–12.000 V. The actual V
o
is influenced by the tolerance of
the feedback resistor and the offset of the operational
amplifier.
Figure 5-13 Current-to-voltage converter
Constant current output
DC voltage measurement
V
o
= –I
f
× R
f