r ig.
;l-.t.
LOW- V Oltage
rower
;,upply
(es(
POintS.
Now check the + 400 volt unregulated supply
of the Power Supply and the + 400 and -300
volt unregulated supplies of the Floating Power
S upply.
The unregulated supplies should be
within 5% of the proper voltage.
Vary the output of the autotransformer between
1 05 and 1 25 volts (or between 210 and 250 volts)
to check the regulation of the low voltage power
s uppli es.
The power supplies must regulate
w ithin 2% (regulated) or 5% (unregulated) of
their correct voltages.
TYPICAL RIPPLE AMPLITUDES
P O W E R
TYPICAL RIPPLE
SUPPLY
- 1 50v
5mv + 50% at 105 and 125v
+ lOOv
5mv + 50% at 105 and 1 25v
+ 300v
30mv + 50% at 105 and 1 25v
+ 400v
4 . 5 v + 50% at 105 and 1 25v
F LOATING
P O W E R
SUPPLY
+ 400v
. 5 v
+
50% at 1 0 5 and 125v
-300v
. 5 v + 50% at 105 and 125v
Using the test oscillos cope . check the ripple
voltage at the output of each power supply
when the autotransformer is adjusted for 1 17
volts. Swing the autotransformer output voltage
from 105 volts to 1 25 volts while observing the
amount of ripple. It should remain about the same
amplitude from low line to high line voltage.
Return the line voltage to 1 1 7 volts.
2. H V Adjustment
While the Type 570 Oscilloscope is still in
a position for access to the underSide, the HV
will be set. Connect the voltmeter to the high
voltage test point shown in figure 5 - 3 . Adjust
the H V
ADJ
until a reading of - 1700 volts
is obtained.
The high-voltage regulation is checked by
observing the voltage reading while changing
the line voltage from 105 to 125 volts .
if
the reading shows a drop or rise then the
high-voltage supply is not regulating properly.
Improper regulation will probably be cured
by changing V605.
3.
Checking + D C Circuit range and Meter
accuracy
Connect the accurate voltmeter between the
AA
C alibration Procedure - Type 570
5 - 3
Summary of Contents for 570
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