HP 532A - Maintenance

Model 532A/B
Page 3
9. ALIGNING FLANGES.
10. Be sure to align the flanges closely with connecting
equipment when making the initial setup. This will help
reduce reflections due to poor flange mating.
11. PRECAUTION.
12. Protect flanges from damage. Scoring or burring
of the mating surfaces may degrade performance. Keep
flange covers on when frequency meter is not in use.
SWEPT
SIGNAL
SOURCE
532A/B
ISOLATOR
OSCP
RECORDER
INSERTION POINT
OPERATING INSTRUCTIONS
13. FIXED FREQUENCY MEASUREMENT SETUP.
14. A typical frequency-measurir^ setup is indicated
in Figure 2. A detector and meter are required to
indicate the resonant point. The attenuator (10 dB or
more) prevents a shift in signal frequency as the fre
quency meter is tuned through resonance. The detector-
meter combination can be either a bolometer and power
meter such as an HP Model 431B/C or a detector and
high-gain voltmeter such as the HP ModeI415D. Either
a crystal or barretter (mounted in a waveguide detector
mount such as the HP Model 485B) can be used with the
415D. The RF source must be modulated with a 1000 Hz
square-wave when the 415D is used as the indicator.
«P532B FREQUENCY METER
ATTENUATOR
MICROWAVE
SIGNAL
SOURCE
HP
4I5D
OR
43IC
INDICATOR
V
DETECTOR
Figure 3. Simplified Swept-Frequency Setup
20. With any swept-frequency setup, the frequency at
which the wavemeter is set is indicated by an absorp
tion of power at a particular frequency. This absorp
tion at a particular frequency is indicated as a notch
in the baseline. To determine that a notch is due to
the frequency meter and not due to the device under
test, move the wavemeter while watching the notch. If
the notch moves, it is due to the frequency meter. The
frequency at the notch can be read by observing the
reading under the black vertical line between the two
horizontal red lines.
21.
MAINTENANCE
22. No maintenance is necessary on the Model 532A/B
except keeping the flange covers on when not in use
and the usual protection against mechanical damage.
Keeping the frequency meter in a plastic bag while not
in use will help prevent the entrance of dust and dirt.
Figure 2. Typical Frequency-Measuring Setup
15. READING THE DIAL.
16. After the frequency meter has been tuned to the
desired indication, the frequency indicated can be read
by observing the reading under the black vertical line
between the two horizontal red lines.
17. SWEPT-FREQUENCY MEASUREMENT SETUP
18. The Model 532A/B frequency meter can also be
used with swept-frequency indicators. Figure 3 illus
trates such a setup.
19. Figure 3 shows the use of the frequency meter
with swept-frequency testing in the most elementary
form. In actual practice the setup is more compli
cated with the device to be tested and other test equip
ment, such as reflectometers, connected at the point
marked "INSERTION POINT."
23. PERFORMANCE TEST.
24. INTRODUCTION.
25. Do the following test for incoming inspection,
troubleshooting, or whenever the performance of the
frequency meter is suspected. Table 2 gives the equip
ment necessary for this test. Other equipment may be
used provided it meets or exceeds the critical specifi
cations. A test card. Table 3, is also provided.
26. FREQUENCY DIAL CALIBRATION.
27. To test the frequency dial calibration proceed
as follows:
a. Connect as shown in Figure 4 (3.95 to 12.4 GHz)
or Figure 5 (12.4 to 18.0 GHz).
b. Set the sweep oscillator for automatic sweep with
100 to 200 MHz AF centered on the lowest frequency
in the band. The transfer oscillator should be normally
set to 200.0000 MHz with an electronic counter reading
of 10,000.0 kHz for all measurement frequencies which
are harmonics of 200 MHz. Refer to Table 4 for fre
quencies which are not harmonics of 200 MHz.
00245-5