Unipolar Mode - HP 59501B Operating And Service Manual

3-67 CC Programming
3-69 Calibration. To calibrate a 59501 B./power supply
combination for CC programming, proceed as follows:
3-70 Test Setup,
a. Connect 59501B to an HP-IB controller.
c. Connect a resistive load in series with an external
current monitoring resistor across supply's out-
put terminals, Refer to Section V of applicable
Operating and Service manual for resistor values,
power ratings, and CC test setup diagram, etc.
Connect a DVM across the current monitoring
resistor.
d. On 59501B , set mode switch to UNIPOLAR
and turn POWER SUPPLY FULL SCALE
ADJUST (COARSE and FINE) fully CCW.
. €. On power supply, set front panel VOLTAGE:
control fuily CW.
3-71 Calibration Procedure.
a. Apply power to the controller, the 595018
and the power Supply. Allow 30-minute warm
up.
b. Program 59501B to "2999" and set POWER.
SUPPLY FULL SCALE ADJUST (COARSE
and FINE) for desired maximum
output current.
(Voltage reading on DVM must be converted
to the equivalent output current).
c. Program 59501B to "2000'Land set ZERO
ADJUST on 59501B for zero output current.
Note that for power supply models 6427-6483,
zero current may not be attainable. When cali-
brating the CC output of one of these supplies,
choose a convenient point, e. g. 10% or 20% of
maximum output and set ZERO ADJUST to
obtain.this value. Data words "21060" and
"2200" correspond to the 10% and 20% output
points, respectively.
d. Program 59501B to "2999" and set POWER
SUPPLY FULL SCALE FINE ADJUST on
89501B. for desired maximum output current.
3-17
- 3-73
e. Turn off supply and open output terminals.
Turn on supply.
3-/2 Sample Program. The sample program provided in
example 4 can easily be modified for CC programming by
substituting | (current) for V (voltage) and by monitoring
the output current using the test setup of paragraph 3-70.
USING 59501B AS A LOW LEVEL
DC SIGNAL SOURCE
As described previously, two programmable output ranges
are available in the selected operating mode (UNIPOLAR or
BIPOLAR). The output ranges available at terminals A1
and A2 are as follows:
Range Unipolar Bipolar
High 0 to 9.99V —10 to 9.98V
Low 0 to 0.999V ~t to +0.998V
3-75 Unipolar Mode