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Timebase Adjustment
The frequency of the 250 MHz oscillator is adjusted with a variable capacitor located on the A13
Acquisition Assembly. The adjustment capacitor can be accessed from a hole in the bottom of
the instrument cover. The adjustment is made so that one cycle of the 250 MHz oscillator
matches the time of the 4 ns ramp.
Software routines built into the DCA firmware make the final adjustments so that the timebase is
accurate across the full range of instrument settings.
N O T E
This adjustment should be performed yearly or after every 2,000 hours of operation.
Manual Testing
Table 3-1. Equipment Required for Manual Timebase Adjustment
Equipment
Plug-in Module
Synthesized CW Generator
a
Attenuator
Timing Generator
Transition Time Converter
Cable, BNC
Adapter, BNC (m) to SMA
(m)
Cable Assembly, 3.5 mm (m)
to 3.5 mm (m) (2 each)
a. not required if 83712B option 1E1 installed
Critical Specifications
54750A, 83480A, or
86100A/B Series plug-in
with electrical input
No substitution
10
or
20
dB;
Frequency range of
dc to 18 GHz
No substitution
2000 ps
Ω
50
, 122 cm (48.in)
Ω
50
61 cm (24 in); Frequency
range of dc to 26.5 GHz
Adjustments
Timebase Adjustment
Recommended Model/Part
Agilent 54751A, 83483A, 86112A
Agilent 83712B
Required Options:
1E5 — High Stability Timebase
Recommended Options:
1E1— Output Step Attenuator
1E8 — 1 Hz Frequency Res.
1E9 — 3.5 mm RF Out Connector
Agilent 33340C
Agilent 8133A Standard or Option 002
Agilent 15438A
Agilent 10503A
Agilent E9633A BNC (m) to SMA
(m), 50 W
Agilent 11500E
3-3
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