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3-80
BPS/A CV Programming
3-61
The following paragraphs provide calibration
procedures and a sample program for bipolar power supply/
amplifier (BPS/A) models 6824A through 6827A. Calibra¬
tion consists of setting the BPS/A's desired bipolar output
range when the 59501B is programmed to its maximum
negative and positive limits. The desired bipolar range can
be set to any value within the rating of the particular
BPS/A. For example, the maximum output range of model
6826A is from —50V to +50V. To calibrate this range, the
-50V output is calibrated with the 595Q1B programmed
to "2000" and the +50V output is calibrated with the
59501B i programmed to "2999". Since the 59501B. is pro¬
grammable in 999 steps, resolution is approximately lOOmV
(100/999). Note if it is desired to have a resolution equal
to exactly lOOmV, the positive limit is set to +49.9V instead
of +50V. For this range {—50V to +49.9V), the resolution
is exactly lOOmV (99.9V/999).
3-62
Calibration. To calibrate a 59501B/BPS/A com¬
bination for CV operation proceed as follows:
3-63
Test Setup.
a. Connect 595018 to an HP-IB controller.
b. Connect 59501B to BPS/A as shown in Figure
3-11.
c. Connect DVM between +S and —S terminals
(models 6825A-6827A) or between OS and CS
terminals (models 6823A, 6824A). Connect
DVM common to —S or OS terminal.
d. On 59501B , set mode switch to BIPOLAR.
e. On BPS/A, set mode switch to VAR GAIN
AMP (models 6825A-6827A) or AMPLIFIER
(models 6823A, 6824A). Also, turn VOLTAGE
(Gain) controls on BPS/A fully CCW.
f. On BPS/A models 6825A through 6827A only,
set RANGE switch to desired output range and
set CURRENT control to mid-range (approx.).
3-64
Calibration Procedure.
a. Apply power to the controller, the 59501B , and
the BPS/A. Allow 30-minute warm-up.
b. With the BPS/A's output terminals open circuited,
program the 59501B to maximum positive
output "2999".
c. Adjust VOLTAGE control on BPS/A and D/A
FULL SCALE ADJUST on 59501B for the.
desired maximum positive output (or 99.9% of
desired max., see paragraph 3-60) using DVM.
d. Program 59501B to maximum negative output
"
2000
";
e. Set ZERO ADJUST on 59501B for the desired
maximum negative output from BPS/A using
DVM.
f. Program 59501B to maximum positive output
"2999".
g. Set D/A FULL SCALE ADJUST for the desired
maximum positive output from BPS/A.
h. Repeat steps d through g until best possible
accuracy is achieved.
NOTE
The following steps apply only when
calibrating BPS/A models 6825A-6827A.
i. Program 59501B to "2500". Connect a short
across BPS/A's output terminals.
j. Program 59501B to "2999" and adjust the
BPS/A's front panel CURRENT control for the
desired maximum output current. If a load
changes causes this current limit to be exceeded,
the supply automatically crosses over to con¬
stant current operation at this preset current
limit and the output voltage drops proportionally.
k. Program "2500". Remove short from output
terminals and connect load.
3-65
Sample Program. Example 5 is a sample program
using a 9825A calculator. The program contains calibration
and setup routines and allows the operator to input specific
positive or negative voltage values on the keyboard. The
program also includes automatic changing of ranges and an
error message if the voltage requested by the operator exceeds
the maximum bipolar value available. A line-by-line explan¬
ation is given after the program. Programming fundamentals
are provided in paragraphs 3-17 through 3-34.
3-66
The sample program in example 5 requires use of
the General I/O and Extended I/O ROM's. After keying in
the program press RUN on the calculator. AH operations
required to complete the program are given on the calculator
display. After each operation is completed, press CONTINUE.
3-15
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