Calibrator Accuracy Test; Frequency Drift Test; Residual Fm Test; Frequency Accuracy And Resettability - HP 608E Operating And Service Manual

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Model 608E!F
608E/F
SIGNAL
GENERATOR ELECTRONIC COUNTER
0 0
I I
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IM""T
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~2!l3B
FREQUENCY
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-
CONVERTER PlUG·IN
Figure 5-3. Frequency Accuracy and
Resettability Test Setup
5-13. CALIBRATOR ACCURACY TEST.
a. Connect signal generator in test setup illustrated
in Figure 5-3.
b. Set FREQUENCY RANGE switch to range E.
c. Set XTAL CAL switch to 5 MC position.
d. Plug headset intoXTAL CAL OUTPUT connector.
e. Adjust Model608E frequency control for MEGA-
CYCLES dial reading of 480 MHz, or Model 608F for
MEGACYCLES dial reading of 455 MHz.
f.
Adjust RF OUTPUT and attenuator controls for
proper triggering of electronic counter.
g. Readjust frequency control for zero beat in
headset. Adjust XT AL CAL GAIN control as reqUired.
h. Electronic COWlter should indicate within +0.01%
<.:t48
kHz) of 480 MHz in Model 608E, or .±O. 01%-8:45. 5
kHz) of 455 MHz in Mode1608F at zero beat in headset.
1.
Set XTAL CAL switch to 1 MC position.
k. Adjust frequency control on Model608E or 608F
for MEGACYCLES dial reading of 270 MHz at zero
beat in headset.
1.
Repeat steps f. and g. Electronic counter should
indicate within .±O. 01% 8:27 kHz) of 270 MHz.
Section V
5-14. FREQUENCY DRIFT TEST.
a. Connect signal generator in test setup illus-
trated in Figure 5-3.
b. Set FREQUENCY RANGE switch to range A.
c. Adjust frequency control for a MEGACYCLES
dial reading of 15 MHz.
d. Adjust RF OUTPUT and attenuator controls for
proper triggering of electronic counter. Allow signal
generator to stabilize, i.e., for one hour after turn on
and -25 minutes after a frequency change.
e. Record electronic counter indication.
f. Wait 10 minutes and again record electronic
counter indication. Frequency should be within
±0.005% (±750 Hz) of the indication recorded in step e.
g. Repeat steps e. and f. for the following FRE-
QUENCY RANGE and MEGACYCLES dial settings.
Allow the signal generator to stabilize for 25 minutes
after changing the frequency before making the fre-
quency drift measurement.
FREQ RANGE
FREQ. DRIFT
B
30 MHz
.±l. 50 kHz
C
75 MHz
.±3. 75 kHz
D
150 MHz
±7. 50 kHz
E
340 MHz
±17.00kHz
5-15. RESIDUAL FM TEST.
a. Connect signal generator in test setup illustrated
in Figure 5-4.
b. Set FREQUENCY RANGE switch to range A.
c. Adjust frequency control for MEGACYCLES
dial reading of 10 MHz.
d. Adjust RF OUTPUT and AMPL TRIMMER con-
trols for a +7 dBm (ATTENUATOR CALIBRATED)
indication on RF OUTPUT meter.
e. Adjust attenuator control for output setting of
o dBm.
f. Readjust frequency control for a 50 kHz indica-
tion on frequency meter on the 100 kHz range.
5-5