Performance Test; Rated Output And Meter Accuracy; Load Regulation; Line Regulation - HP BENCH Series Operating And Service Manual

POWER SUPPLY
UNDER TEST
I^VVV
LOAD
REFERENCE
VOLTAGE
SOURCE
O O
NULL
DETECTOR
9-P 9
POWER SUPPLY
UNDER TEST
iF -
0 o o
Rs»
MODEk NO.
Rl
62I3A/62I4A
62I5A/62I6A
62I7A/62I8A
ICQ , IOW,i5%
65n., low, ±5%
250n , IOW,i5%
LOAD
RESISTOR
CURRENT
SAMPLING
RESISTOR
'WV
DIFFERENTIAL.
VOLTMETER
- F- G
9 Q_P
• REFER TO R33 IN PARTS LIST (SECTION VI)
Figure 5-3. Differential Voltmeter
Substitute Test Setup
-CAUTION-
Care must be exercised when using an
electronic null detector in which one
input terminal is grounded to avoid
ground loops and circulating currents.
5-13 PERFORMANCE TEST
5-14 The following test can be used as an incom
ing inspection check and appropriate portions of
the test can be repeated either to check the oper
ation of the instrument after repairs or for periodic
maintenance tests. The tests are performed using
a 115-VAC 60 Hz, single phase input power source.
If the correct result is not obtained for a particular
check, do not adjust any controls; proceed to
troubleshooting (Paragraph 5-48).
5-15 RATED OUTPUT AND METER ACCURACY
5-16 Voltage. To check the output voltage, pro
ceed as follows;
a. Connect load resistor (Rl) indicated in
Figure 5-4 across the output terminals of supply.
b. Connect differential voltmeter across (+)
and (-) terminals of supply observing correct po
larity.
c. Set METER SELECTION switch to VOLTS
and turn on supply.
d. Adjust VOLTAGE controls until front panel
meter indicates exactly the maximum rated output
voltage.
e. Differential voltmeter should indicate
maximum rated output voltage within ±2%.
5-17 Current. To check the output current, pro
ceed as follows:
a. Connect test setup shown in Figure 5-4.
Figure 5-4. Output Current, Test Setup
b. Set METER SELECTION switch to MA
position.
c. Turn on supply and adjust VOLTAGE con
trols until front panel meter indicates maximum
rated output current.
d. Differential voltmeter should read as
follows: Model No. Reading (Vdc)
6213A 1 ±0.03V
6215A 1.2±0. 036V
6217A 1.2±0. 036V
5-18 LOAD REGULATION
Definition: The change AEqut in the
static value of DC output voltage re
sulting from a change in load resist
ance from open circuit to a value
which yields maximum rated output
current (or vice versa).
5-19 To check the constant voltage load regula
tion, proceed as follows:
a. Connect test setup as shown in Figure
5-5.
b. Set METER SELECTION switch to MA
position.
c. Turn on supply and adjust VOLTAGE
controls until front panel meter indicates maximum
rated output current.
d. Read and record voltage indicated on
differential voltmeter.
e. Disconnect load resistor.
f. Reading on differential voltmeter should
not vary from reading recorded in step d by more
than 4mV.
5-20 LINE REGULATION
Definition: The change, AEquT' the
static value of DO output voltage result
ing from a change in AC input voltage
over the specified range from low line
(usually 105 volts) to high line (usually
125 volts), or from high line to low line.
5-3