Maintenance; Introduction; Performance Tests; Specifications - HP 652A Operating And Service Manual

Model 652A

5- 1 . INTRODUCTION.

5�2. This section contains maintenance and service inforM
malion for the -hp · Model 652A Test Oscillator. Included
are Performance Tests; Adjustment and Calibration Proce�
dUfes, and Troubleshooting Procedures.
5-3. REGUIRED TEST EQUIPMENT.
5-4. The equipment needed to properly maintain the
Model 652A is listed in Table 5·1. The table lists the type
of equipment to be used, the specification requirements,
and the recommended commercially available test equip�
ment. If the equipment listed in Table 5-1 is not available,
any instrument that satisfies the given specifications may be
used.
5·5. PER FORMA N C E TESTS.
5 · 6 . The performance tests are in·cabinet tests which insure
the Model 652A Test Oscillator is operating within specifi,
cations. These tests can be used for incoming inspection,
periodic maintenance, and for specification tests after a
repair. Use the performance tests to verify instrument
performance before making internal adjustments or repairs.
It is recommended that performance tests and calibration
be performed at 6 month intervals. A removable test card is
located at the end of Section V. This may be used for
making a permanent record of the performance of the
652A during the Performance Tests.
NOTE
Paragraphs 5,18 and 5-19 are labeled as
"Optional" tests for the f ollowing reasons:
(Paragraph 5-18 Hum and Noise Test) Top
cover of 652A must be removed to make this
test. (Paragraph 5-19 Amplitude Stability Test)
652A output amplitude must be monitored
continuously for one month to make this test.
TEST OSCILLATOR
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SECTION V

MAINTENANCE

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FEED THRU
Figure 5·1. Frequency Tests.
5-7. F requency Range Test.
a. Connect 652A 50 ohm output to dc input of
electronic counter as shown in Figure 5·1.
b. Set 652A controls as follows:
FREQUENCY RANGE . . . . . . . . . . . . . . X I O
FREQUENCY dial . . . . . . . . . . . . . . . Extreme
OUTPUT ATTENUATOR . . . . . . . . . . 3.0 V
OUTPUT MONITOR
OUTPUT AMPLITUDE
and VERNiER
c. Counter should read a period average of 100 ms
greater, verifying a frequency of at least 10 Hz at lower end
of frequency range.
d. Set 652A FREQUENCY RANGE to X I M and
FREQUENCY dial to extreme counterclockwise position.
Counter should read a frequency of 10 MHz or greater,
verifying a frequency of at least 10 MHz at upper end of
frequency range.
e. Perform Frequency Calibration, Paragraphs 5,27
through 5·34, if tolerances are not met.
5-8.
Oial Accuracy Test.
a. Connect 652A 50 ohm output to de input of
electronic counter as shown in Figure 5·1.
b. Set 652A controls as follows:
FREQUENCY RANGE . . . . . . . . . . . . . . XIO
FREQUENCY dial . . . . . . . . . . . . . . . . . . . . I
OUTPUT ATTENUATOR
OUTPUT MONITOR
OUTPUT AMPLITUDE
and VERNiER .
- - - -
,
,
,
50 OHM
, "
hp I I048C
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_/
Section V
Clockwise
NORMAL
• . . . . • . . . . . .
3.0 V on
• • . • . . . . . • . . . . .
monitor
3.0 V
. . . • . . • . . .
NORMAL
. . . . • . . . . . . .
,
3 .0 V on
. . . . . . . . • . . . .
monitor
ELECTRONIC COUNTER
hP5245L
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or
5-1