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user must determine the importance of having a round
number for resolution when writing programs.
3-55
Calibration. To calibrate a. B9501B /power supply
combination for CV operating, proceed as follows:
3-56
Test Setup.
a. Connect
59501B to ah HP-IB controller.
b. Connect
595018 to power supply (CV program-
ming}, see Table 3-1.
c. Connect DVM between +S and —S terminals
on the power supply.
l
d. On 59501B, set mode switch to UNIPOLAR
and turn POWER SUPPLY FULL SCALE
ADJUST (COARSE and FINE) fully CCW.
Also, if power supply has a front panel
CURRENT control, set it to mid-range (approx.)
a. Apply power to the controller, the 59501B , and
the power supply.
Allow-30-minute warm-up.
b. With the power supply's output terminals
(+ and —) open circuited, program the 595018
to maximum high range "2999."
c. Adjust POWER
SUPPLY FULL SCALE
ADJUST (COARSE and FINE) on
59501B for
desired maximum output voltage (or 99.996 of
desired max., see paragraph 3-54) using the DVM.
d. Program 59501B.to zero output "2000." `
e. Set ZERO ADJUST on 59501B for 0.000.
reading on DVM.
f. Program
595018 to ''2999" and set POWER
SUPPLY FULL SCALE FINE ADJUST on .
595018
for desired maximum
output voltage. -
if necessary, use D/A FULL SCALE ADJUST
to obtain the required resolution.
NOTE
If the supply has a front panel CURRENT
control, perform the following steps.
g. Program 59501B to zero output "2000". Con-
nect a short across supply's output terminals.
h. Program
59501B to "2999" and adjust the sup-
ply's front panel CURRENT control for the desi-
red maximum output current,
If aload change -
causes this current limit to be exceeded, the
supply automatically crosses over to constant
3-13
current operation at this preset current limit
and the output voltage drops proportionally.
if
desired, the front panel CURRENT control can
be disabled and replaced with a fixed resistor of
appropriate value (see applicable power supply
Operating and Service Manual).
i. Program "2000".
Remove short from supply's
output terminals and connect load.
3-58
Sample Program. A sample program for controll-
ing power supply CV outputs is given in example 4. The
program is written specifically for a 9825A calculator but
could be modified for.use with other calculators. The pro-
gram contains calibration and setup routines and allows the
operator to input specific voltage values on the keyboard.
The program also includes automatic changing of ranges
and error messages that indicate when the voltage re-
quested by the operator exceeds the maximum value
available or when a negative voltage is requested. A line-
by-line explanation is given after the program. Program-
ming fundamentals are provided in paragraphs 3-17 through
3-34.
3-59
The sample program requires use of the General
I/O and Extended I/O ROM's. After keying in the program,
press RUN on the calculator.
All operations required to
complete the program are given on the calculator display.
After each operation is completed, press CONTINUE.
The
. operator enters the maximum desired output voltage value
(e. g. 20) when "Enter maximum output voltage" appears
on the display. The program automatically uses 99.996 of
this value (e. g. 19.98) to calibrate the supply (see paragraph
3-54). After connecting the load, the operator enters the
desired output voltage (line 13) on the keyboard and
press CONTINUE.
if it is desired to recalibrate the power
supply (change the maximum desired output voltage) press
STOP and then press RUN.
.
NOTE.
The program listings provided in the following
examples are taken from an HP 98668 printer.
These listings are provided only because 9866B
printouts are easier to read than printouts
from the 9825A's internal strip printer.
Also,
a check sum is provided at the end of. each 9825A
program listing. Make sure that the check sum at
the end of your keyed-in program matches. the
check sum provided in the listing.
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