Calibration— Type 503
Fig. 6-6. Toil equipment setup for power supply iiDDi.
°"d . .9u|o|l0n
6. Check Power Supply Ripple and Regulation
a. Test equipment setup is shown in Fig. 6-6. The Type
503 control settings remain as in Stop 1.
b. Sot the DC voltmeter to the appropriate scale and
connect the leads to tbs —100 volt test point and chassis
ground.
c. Set the tost oscilloscope vertical deflection sensitivity
to 10 millivolts/cm, AC coupled, and the sweep »ime/cm
to 5 milliscconds/cm.
d. Connect the I X probe to the — 100 volt test point.
e. Vary the aulotransformor output voltoge between 105
and 125 volts while monitoring the DC voltmeter and the
test oscilloscope.
I. Check—The —100 volt supply should remain within
the ± 2 % tolerance from the 105 to 125 V setting of the
autotransformer; the 120-Hz ripple should not exceed 15
millivolts.
g. Repeat steps (b) through (e) for the + 12.6 V, + 100V,
and +250 V supplies, checking for regulation and 120 Hz
ripple tolerance as indicated in Table 6-1.
CAUTION
Do not attempt to check the ripple on the — 3000
volt supply, as the input voltage roting on the test
oscilloscope w ill be exceeded.
h. Move the 1 X probe to the —100 V test point indicated
in Fig. 6-7. (The test points indicated in the figure were
selected to avoid excessive 30 kHz ripple from the 30 kHz
power oscillator.)
TABLE 6-1
Power
Supply
Voltage
Voltage
Tolerance
Ripple
Tolerance
120 Hz 30 kHz
-1 0 0 V
± 2 V 15 mV
5 mV
t 126 V
‘ 1 26 V
15 mV
5 mV
+ 100V
± 5 V
15 mV 5 mV
+ 250 V
±12.5 V
50 mV
20 mV
Fig. 6-7. Tost point location* fo r checking 30 kH i power supply
ripple.
©
6 -8
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