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POWER
SUPPLY
UNDER TEST
LOAD
NULL
DETECTOR
+
REFERENCE
VOLTAGE
SOURCE
Figure 5-2.
Differential Voltmeter Substitute
Test Setup
CAUTION
Care must be exercised when using an elec-
tronic null detector in which one input termi-
nal is grounded to avoid ground loops and
circulating currents.
5-11
PERFORMANCE TEST
5-12 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
preventive maintenance tests.
5-13 The performance check is made using a 115-
volt, 60-Hz (cps), single-phase input power
source.
The performance check is normally made
at a constant ambient room temperature. The tem-
perature range specification can be verified by
doing the performance check (except temperature
stability check) at a controlled temperature of
o
0
c and at a controlled temperature of sooc.
If
the correct result is not obtained for a particular
check, do not adjust any controls; proceed to
trouble shooting.
5-14 RATED OUTPUT, METER, AND OUTPUT
CONTROLS ACCURACY
5-15 Voltage.
To check the accuracy of the out-
put voltage, front panel voltmeter, and front panel
voltage controls, proceed as follows:
a.
Connect the differential voltmeter, load
resistor, and the attenuator to the power supply as
illustrated in Figure 5-3.
Load resistance is
SOOK ohms, 18 watts.
b.
Turn the front panel VOLTAGE thumbwheel
controls until the front panel voltmeter indicates
exactly 3000Vdc.
5-4
T-CONNECTOR
POWER
SUPPLY
RL
500K
IBW
.•.
DIFFERENTIAL
VOLTMETER OR
OSCILLOSCOPE
G-59/U
Figure 5-3.
Line and Load Regulation, Test Setup
c.
The differential voltmeter should indi-
cate 30 ± 0. 6Vdc.
5-16 Current.
To check the output current capa-
bility of the supply, proceed as follows:
a.
Connect the multimeter (set to the lOmA
position) or another milliammeter in series with a
SOOK, 18W load resistance, and attach the series
c,ombination to the output terminals.
b.
Adjust the VOLTAGE thumbwheel controls
until the front panel voltmeter indicates 3000Vdc.
c.
The multimeter should indicate 6mA.
5-17 LOADREGULATION
Definition: The change t:,EQUT 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).
5-18 To check constant voltage load regulation,
proceed as follows:
a.
Connect differential voltmeter, load
resistor and attenuator to the power supply as il-
lustrated in Figure 5-3.
b.
Turn the front panel VOLTAGE thumb-
wheel controls until the front panel voltmeter in-
dicates exactly 3000 volts.
c.
Read and record voltage indicated on
differential voltmeter.
d.
Disconnect load resistor.
e.
Reading on differential voltmeter should
not vary from reading recorded in step c by more
than 3mV.
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