Performance Check/Calibration—Type 422 AC-DC
Variable DC
power supply
DC power Three-inch
cord screwdriver
1 X probe
Time-mark
generator
Fig. 5-1. Test equipment required for steps 1 through 15.
1. A djust-12-Volt Supply
PERFORMANCE CHECK ONLY
Steps 1 through 9 are not applicable to a performance
check. Set controls as given under Preliminary
Control Settings and begin with step 10.
a. Test equipment required for steps 1 through 15 is
shown in Fig. 5-1.
b. Change the following control settings:
INTENSITY Counterclockwise
TRIGGERING Mode NORM (pulled out)
Power Mode (rear panel) OPERATE 11.5 - 35V DC
c. Connect the precision DC voltmeter from the
-12-volt test point (in indicator, see Fig. 5-2A) to chassis
ground.
NOTE
Power Supply voltage and ripple tolerances given in
steps 1 through 8 are typical values provided as guides
to correct instrument operation and are not
instrument specifications. Actual values may exceed
those listed without loss of measurement accuracy if
the instrument meets the specifications given in
Section 1 as tested in this procedure.
d. CHECK—Meter reading; —12 volts ±0.12 volt.
e. ADJUST— —12 Volts adjustment R1130 (see Fig.
5-2B) fo r-1 2 volts.
f. INTERACTION—May affect operation of all circuits
within the Type 422.
2. Adjust Blocking Oscillator Frequency
a. Connect the precision DC voltmeter to the DC input
monitoring points (see Fig. 5-3A).
b. Set the variable DC power supply for 11.2 volts as
indicated on the precision DC voltmeter.
c. Connect the IX probe to the test oscilloscope vertical
input connector.
d. Set the test oscilloscope for a vertical deflection
factor of 20 volts/division at a sweep rate of 20
microseconds/division.
e. Connect the probe tip to the oscillator frequency test
point (junction of D1176-D1177; see Fig. 5-3B). Connect
the probe ground strap to chassis ground.
[A] 5-9
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