Front Panel Operation Check - HPE 606A Operating And Servicing Manual

Model 606A
4-5 FRONT PANEL OPERATION CHECK
The following in-cabinet procedures are simple
checks
to be performed
first whenever difficulty
is encountered in operation of the signal genera-
tor. These checks will isolate the trouble to either
the signal generator
or associated equipment and
if the trouble is in the signal generator will isolate
it to a particular section,
Always perform these
checks before attempting to isolate the trouble
within the instrument.
- Turn unit on with no load and allow to
warm up five minutes or more.
- If output meter is off scale in the nega-
tive direction, check for blown B+ fuse.
10 MC CRO
LO-M-208
Figure 4-2, Modulation Meter Calibration
A.
MODULATION METER CALIBRATION
2) Set RANGE switch to 530-1800 kc band.
3) Set FREQUENCY control to 1000 kc.
4) Set MODULATION SELECTOR to CW.
5) Set ATTENUATOR to I VOLT.
7) Set MODULATION SELECTOR switch to 1000%
9) Increase MODULATION AMPLITUDE level.
Distortion should be low up to 95% modulation.
Sect.IV Page 3
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a y sil rN
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Figure 4-3. Waveform for 50% Modulation
B. FREQUENCY CALIBRATION
The easiest way to check frequency calibration
is with a counter, such as the @ Model 524B/C/D
with a 525B plug-in converter. Ifa counter is not
available proceed as follows:
1) Allow both a receiver capable of receivingWWV
and the Model 606A to warm.up for fifteen minutes,
2) Tune in WWV on 5, 10, or 15 mc, whichever
gives best reception.
ly- M-209
Figure 4-4. Frequency Calibration
3) Lightly couple a single wire from the RF OUT
jack of the 606A to the antenna as shown.
4) Tune the RANGE and FREQUENCY controls of
the 606A to the frequency of the incoming WWV
signal. The MODULATION SELECTOR switch
should be on CW (no modulation).
5) Adjust the output level to be about the sane as
WWYV (use S meter on receiver if it has one), Too
much signal will block the receiver and olscure
the beat-note.