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•
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d.
Set HP 8660C to output a 100 MHz sinewave,
varying the HP 86603A vernier until the HP 436A
power Meter reads -24 dBm, ±0.3 dBm. Adjust A1R34
for a stable display of 100.00000 MHz, ±10 Hz.
e.
Vary the frequency range from 90 MHz to 1000
MHz and ver:fy the HP 5385A displays the correct
count.
f.
Turn the HP 5385A and the HP 8660C off and
disconnect all test equipment.
5-19.
Standard Oscillator Adjustment Procedures
5-20.
The procedure used for adjusting the standard
oscillator is the same as the procedure used for ad-
justing the TCXO at 25°C described in paragraph 5-23.
Refer to paragraph 5-23 for adjustment procedure.
5-21.
TCXO Adjustment Procedure
5-22.
Two procedures are given for the adjustment
of the TCXO (Temperature compensated Crystal
Ocsillator). If the operation of the counter will be
solely at 25°C (77°F), then adjust the oscillator fre-
quency as close as possible to 10 MHz using the
procedure in paragraph 5-23.
If
the operation of the
counter will be over the full temperature range (0°C
to 40°C) then the TCXO must be offset by the amount
HP 5384A and HP 5385A
Adjustments
labeled on its cover to keep the TCXO frequency
within the manufacturers frequency specifications
over the temperature range of 0°C to 40°C. In this
case use the procedure in paragraph 5-28. The TCXO
is factory set for use near 25°C.
5-23.
Adjustment of the TCXO at 25°C
NOTE
Allow 30 minutes warm-up time for the counter.
a.
Connect a house standard (reference frequency)
to the EXT TRIGGER input of an HP 1740A Oscillo-
scope as shown in Figure 5-6. Set the HP 1740A
oscilloscope to EXT (trigger).
b.
Connect the HP 5384A/HP 5385A rear panel10
MHz REFERENCE IN OUT to the channel A input of
the HP 1740A oscilloscope as shown in Figure 5-6.
c.
Select I NT with the 10 MHz REFERENCE I NT EXT
select switch on the rear of the instrument (see Figure
5-7).
d.
Adjust the frequency for minimum sideways
movement of the 10 MHz signal with the OSC ADJ
located on the rear of the instrument (see Figure 5-7).
For the Standard Oscillator, the same rear panel
location is used to adjust A1C66, the standard oscil-
lator fine adjustment capacitor.
If
A1C66 does not
have enough range to minimize movement, adjust
IL
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REFERENCE
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FREQUENCY
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STANDARD
10 MHz REF
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INPUT/OUTPUT
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0
s
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0 0
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0
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0
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0
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I
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B
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B
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0
r.'l
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-
-
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HP 5384A/HP 5385A
INPUT A
EXT
FREQUENCY COUNTER
TRIGGER
INPUT
Figure 5-6. Standard, TCXO and Oven Oscillator Test Setup
5-5
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Troubleshooting
