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indicates exactly the maximum rated output voltage.
5-77
Ammeter Calibration
5-78
To calibrate the ammeter, proceed as follows:
a. Connect test setup shown in Figure 5-7.
b. Turn VOLTAGE controls fully clockwise.
c. Turn on supply and adjust CURRENT controls until
digital voltmeter reads 500mV.
d. Adjust R101 until front panel ammeter indicates
exactly maximum rated output current.
5-79
Constant-Voltage Programming
Calibration
5-80
To calibrate the zero voltage programming
accuracy, proceed as directed in paragraph 5-81,5-82,
5-83, 5-84, or 5-85, whichever applies to your particular
instrument. To calibrate the constant voltage programming
accuracy, proceed as directed in paragraph 5-86, 5 87 or
5-88.
5-81
Zero Output Voltage, Standard Instrument With
Resistance or Unity-Gain Voltage Programming. For
instruments using either local programming or the remote
programming setup shown in Figure 3-4 or 3-5, zero the
output voltage as follows:
a. Connect digital voltmeter between +OUT and -OUT
bus bars.
b. If unit is to be used in local programming mode, turn
VOLTAGE controls fully counterclockwise. If unit is to
be used in remote programming mode, connect remote
programming setup and adjust remote resistance or voltage
to zero.
c. Connect decade resistance box between pads in zero
adjust section of A1 main circuit board that are marked
"A" and "B" in Figure 5-9. (These pads are for R110).
d. Rotate CURRENT controls fully clockwise and
turn on supply.
e. Adjust decade resistance box until digital voltmeter
reads exactly zero volts.
f. Replace decade resistance box with fixed, metal film,
1 %, 1 /4 or 1 /8 watt resistor of same value.
5-82
Zero Output Voltage, Standard Instrument With
Variable Gain Voltage Programming. For instruments using
the programming setup shown in Figure 3-6, zero the output
voltage as follows:
a. Perform steps (a) and (b) of paragraph 5-81.
b. Solder a jumper between pads in zero adjust section
of A1 main circuit board that are marked "C" and "D"
in Figure 5-9.
c. Connect decade resistance box between pads marked
"E" and "F" in Figure 5-9. (These pads are for resistor
R111).
d. Perform steps (d) through (f) of paragraph 5-81.
5-83
Zero Output Voltage, Option 020 Instrument
With Resistance or Unity-Gain Voltage Programming. For
Option 020 instruments using either local programming or
the remote programming setup shown in Figure 3-4 or 3-5,
zero the output voltage as follows:
a. Perform steps (a) and (b)of paragraph 5-81.
b. Rotate CURRENT controls fully clockwise and turn
on supply.
c. If reading on digital voltmeter is not exactly zero
volts, adjust potentiometer R113 (labeled "VOLTAGE
ZERO" and accessible through hole in rear panel) until
reading is exactly zero.
5-84
Zero Output Voltage, Option 020 Instrument
With Variable Gain Voltage Programming. For Option
020 instruments using the programming setup shown in
Figure 3-6, zero the output voltage as follows:
a. Perform steps (a) and (b) of paragraph 5-81.
b. Rotate CURRENT controls fully clockwise and
turn on supply.
c. If reading on digital voltmeter is not exactly zero
volts, adjust potentiometer R112 (labeled "VOLTAGE
PROG" and accessible through hole in rear panel) until
reading is exactly zero.
5-85
Zero Output Voltage, Option 040 Instrument.
Zero the output voltage of Option 040 instruments as
follows:
a. Connect digital voltmeter between +OUT and —OUT
bus bars.
b. Connect a 1012 ± 1% programming resistor as
shown in Figure 3-4.
c. Rotate CURRENT controls fully clockwise and
turn on supply.
d. Adjust potentiometer R113 (labeled "VOLTAGE
ZERO" and accessible through hole in rear panel) until
reading is zero volts ±1mV.
Figure 5-9. Zero Adjust Section of Main Circuit Board
5-17
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