HP 59501A Operating Manual page 10

Before programming a 59501A-power supply
combination, a two-step calibration procedure must
be performed to match the particular power supply
to the 59501 A. A similar calibration is necessary
when the 59501A is used as a low level DC signal
source.
A»1. Unipolar Operation
Unipolar Constant Voltage Programming
Calibration
1. Connect the digital voltmeter between the +S
and -S terminals on the power supply.
2. Set the mode switch on the rear of the 59501A to
UNIPOLAR and turn the POWER SUPPLY FULL
SCALE ADJUST potentiometers fully
counterclockwise.
3. If the power supply has a front panel current con¬
trol, set it to mid-range.
4. Apply power to the
HP
85, the 59501A, and the
power supply. Allow a 30 minute warm-up.
Unipolar Constant Current Programming Calibration
1. Connect a resistive load in series with an external
current monitoring resistor across the supply's
output terminals. Refer to Section V of the ap¬
plicable operating and service manual for resistor
values, power ratings, and CC test setup diagram.
2. Connect a digital voltmeter across the current
monitoring resistor.
3. Set the mode switch on the rear of the 59501A to
UNIPOLAR and turn the POWER SUPPLY FULL
SCALE ADJUST potentiometers fully
counterclockwise.
4. On the power supply, set the front panel
VOLTAGE control fully clockwise.
5. Apply power to the HP 85, 59501A and the power
supply. Allow a 30 minute warm-up.
Figure 36 is a program for constant voltage program¬
ming calibration of a 59501A-power supply combina¬
tion. It contains set-up and calibration routines,
automatic range changing, and will prompt with an er¬
ror message if the voltage entered is negative.
Instructions:
Enter the program and press @ . All required
calibration operations are displayed on the CRT of the
HP 85. The maximum desired output voltage (e.g. 20)
should be entered when prompted by the program.
The program automatically uses 99.9% of the value
(e.g. 19.98) to calibrate the 59501 A-power supply com¬
bination. To run the program again, press then
(bun)
I /
iO !
SO ! CALiBRAT'ION FOR
;'J0 ! UNIPOLAR POWFIR SUPPLY
^0 ! VOLTAGE OUTPUT
50 !
60 ! ins»tr'uct:i.ons
70 !
BO CLEAR
90 I)'J:SP "Set the ^•i9S0:i,A node siwltch to "
100 I)J:SP "UNIPOLAR, then pretf^a CONT , "
110 PAUSE
120 DIBP "Turn the Power Supply Full ScaleAdj
uatwent pot« fully CCW and then press CONT.
" » DIBP
130 PAUSE
140 !
ISO ! User enters MaxlwuM output uoltaqe des
Irosd .
160 !
170 DISP e DISP "Enter the naxlMun output vol
t a g e"
180 INPUT V
190 IF V<'^0 THEN BEEP 8 DISP "NO NEGATIVE VOL
TAGES ALLOWED" @ GOTO 170
20 0
!
210 ! Resolution is calculated
220 f and the MaxinuM desired
230 ! output is changed to
240 ! 99,9% of the voltage
2S0 ! entered on line 170
260 I
27 0 D==V/i0()0
280 V=V-D
290 !
300 i Calibration routine
3i0 !
320 OUTPUT 706 USING "#,4D" ; 2999
330 DISP "Bet the Power Supply Full Scale Adj
ustwent pots for an output of ';V> " Voits. "
340 DISP "Then press CONT,"
3S0 PAUSE
360 CLEAR
370 OUTPUT 706 USING "♦,4D" j 2000
380 DISP "Set the Zero Adjust pot for an out
put of 0 . 000 Volts."
390 DISP "Then press CONT." @ DISP
400 PAUSE
4i0 OUTPUT 706 USING "*,40" j 2999
420 DISP "Adjust the Power Supply Full Sea
le l"'ine Adjust pot for an output of"jV}''Vo
Its, "
430 DISP "Then press CONT, "
440 PAUSE
4S0 DISP " "
460 DISP "CALIBRATION COMPLETE"
470 END
Figure 36. Unipolar Power Supply
Programmer Calibration Program.
The program listed in Figure 36 may be modified for
constant current programming calibration of a 59501A
power supply combination. Current must be
substituted for voltage and the output current must be
monitored using the above set-up.
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