HP BENCH Series User Manual

Table 5-7. Calibration Adjustment Summary
Adjustment or Calibration Paragraph
Control Device
Meter Zero
5-57
Pointer
Ammeter Tracking
5-59
R72
"Zero" Volt Output
5-61
R6 or R8
Current Limit
5-63
R81
5-55 ADJUSTMENT AND CALIBRATION
5-56 Adjustment and calibration may be required
after performance testing, troubleshooting, or re
pair and replacement. Perform only those adjust
ments that affect the operation of the faulty circuit
and no others. Table 5-7 summarizes the adjust
ments and calibrations contained in the following
paragraphs.
5-57 METER MECHANICAL ZERO
5-58 Proceed as follows to zero meter:
a. Turn off instrument (after it has reached
normal operating temperature) and allow 30 sec
onds for all capacitors to discharge.
b. Insert sharp pointed object (pen point or
awl) into the small hole at top of round black
plastic disc located directly below meter face.
c. Rotate plastic disc clockwise (cw) until
meter reads zero, then rotate ccw slightly in order
to free adjustment screw from meter suspension.
If pointer moves, repeat steps b and c.
5-59 METER CALIBRATION
5-60 To calibrate the ammeter, proceed as follows:
a. Connect test setup as shown on Figure 5-4.
b. Set METER SELECTION switch to mA
position.
c. Turn on supply and adjust VOLTAGE con
trols so that differential voltmeter indicates exactly
1. 2 volts for 6215A and 6217A, and I Volt for 6213A.
d. Adjust R47 until front panel ammeter in
dicates: 6213A lA
6215A 400mA
62I7A 200mA
5-61 ZERO VOLTS OUTPUT ADJUSTMENT
5-62 To calibrate the output voltage so that there
is zero volts output when the VOLTAGE controls are
fully ccw, proceed as follows:
a. Connect differential voltmeter between
(+) and (-) output terminals.
b. Short out voltage controls by connecting
jumper across RIO and Rll.
c. Turn on supply and observe reading on
differential voltmeter.
d. If it is more positive than 0 volts, shunt
resistor R5 with a decade resistance box.
e. Adjust decade resistance until differen
tial voltmeter reads zero, then shunt R5 with re
sistance value equal to that of the decade resist
ance.
f. If reading of step c was more negative
than 0 volts, shunt resistor R7 with the decade re
sistance.
g. Adust decade resistance until differen
tial voltmeter reads zero, then shunt R7 with re
sistance value equal to that of the decade resist
ance.
5-63 OUTPUT CURRENT LIMIT ADJUSTMENT
5-64 To adjust the limiting level of the output
current, proceed as follows:
a. Attach the multimeter or a milliammeter
to the output terminals of the supply. Set the
meter for approximately 600 mA. The internal
resistance of the meter is low enough to overload
the supply so that the output will current limit.
b. Adjust the VOLTAGE controls fully clock
wise.
c. Adjust current limit control R50 for the
following indications on the multimeter:
Model
6213A
6215A
6217A
Current Limit
1300mA
475mA
250mA
5-13

HP BENCH Series Specifications

General

Brand	HP
Model	BENCH Series
Category	Power Supply
Language	English