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24. Track and Hold
Adjustments
Reference
Description
Equipment
Procedure
3-142 Adjustments
The CAL OUTPUT signal is connected to the RF INPUT. The
instrument is placed in zero frequency span to produce a dc level
output from the IF-Video section and this dc level is regulated by
adjusting the reference level. The Offsets and Gains on the Track and
Hold assembly are adjusted for proper levels using a DVM.
SPECTRUM
ANALYZER
Figure 3-87. Track and Hold Adjustments Setup
Digital Voltmeter (DVM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 3456A
1. Place instrument upright as shown in Figure 3-87 with top and A3
Digital Storage covers removed.
2. Set LINE switch to ON and press
3. Connect CAL OUTPUT to RF INPUT.
4. Connect DVM to A3A9TP3 and ground to A3A9TPl.
Key in
5.
FREQUENCY
6. Disconnect cable 7 (violet) from A4AlJl.
7. Short A3A9TPl to A3A9TP3, or use an SMB snap-on short to
8. Key in CRINGLE], TRACE A
MARKER [nl, SWEEP (CONT), (SHIFT_) TRACE A (BLANK) e.
9. Adjust A3A9R59 (T/H) OFS until MARKER
indicated by CRT annotation flickers back and forth between .OO
and .lO dB. See Figure 3-88 for location of adjustment.
DIGITAL VDLTMETER
(
].
INSTR PRESET
MHz,
20
)
SPAN
MARKER C-1,
(
-
],
CLEAR
WRITE
level indication as
0 Hz.
]
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