7-4
Adjustments and Calibration
Timebase Adjustments
Option 001 High Stability Timebase Adjustment Procedure
1. Remove the instrument top cover. Power up the instrument and let it warm up for
approximately 1 hour.
2. Removethe rear-panel cable between the Opt. 001 REF OUT and REF IN connectors
(if present).
3. Attach a high accuracy frequency counter to the rear panel OPT 001 REF OUT. The
frequency counter resolution and accuracy should be at least 1 Hz at 10 MHz.
4. Adjustthe high stability timebase (see figure 7-1) until the frequency counter reads 10
MHz.
NOTE After performing this calibration, it is necessary to install a cable from the OPT 001 REF
OUT to the REF IN connector for the instrument to use the high stability timebase as the
reference.
Figure 7-1 High Stability Timebase Adjustment
Adjust to
10 Mhz