HP 10811A, Operating & Service Manual

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Model 10811A/B
19
Table 4-2. Operational Verification Procedure (Continued)
e. Set INTENSITY and PERSISTENCE controls for an easily readable display at the 10 s scan
time.
f. Verify that there are no repeating signals above a level 65 dB below the 10 MHz signal (i.e., no
signals between -64 dB and 0 dB). Allow the analyzer to sweep through several times to verify
that no signals repeat on successive sweeps. Signals greater than -65 dB indicate possible
spurious signals on 10811A/B output. Be sure there is no other equipment nearby that could be
radiating signals into the measurement. Be sure power supplies meet noise specifications as
described in
Table 1-1 .
4. Short-Term Stability
NOTE
If the model 5390A frequency stability analyzer is
available it should be used in place of the text
described below. Follow instructions in the 5390A
operating manual to make measurement.
a. Connect the equipment as follows:
NOTE
Arrange the instruments as shown. Keep all signal leads away from
power cords and HP-IB cable. DO NOT FORGET THE 10515A
DOUBLER ON THE 5065A OUTPUT. Connect all ac power to the same
strip so that all ground paths are as short as possible. DO NOT STACK
THE INSTRUMENTS. Use coax for all signal leads.
b. Set the 5345A address to 18:
A5 A4 A3 A2
1 (16) 0 (8) 0 (4) 1 (2) = 18
c. Allow 1-hour warmup to stabilize the test equipment and the 10811A/B.
d. Set the 5345A front panel controls as follows:
FUNCTION ·········································································· FREQ A
GATE TIME ········································································· 1 s
SAMPLE RATE ··································································· max (ccw)
GATE CONTROL INPUT (REAR PANEL) ·························· INTERNAL
A LEVEL ·············································································· PRESET
B LEVEL ·············································································· PRESET
A IMPEDANCE ··································································· 50 ohm
B IMPEDANCE ··································································· 50 ohm
A ATTENUATOR ································································ X1
B A TTENUATOR ······························································· X1