Solartron 1250 - Procedure for Establishing the Sync. Locked State

Options 1250 Frequency Response Analyzer
15-8 AMK/1250/2
15.1.7 PROCEDURE FOR ESTABLISHING THE SYNC. LOCKED STATE
1. Initialise.
2. Ensure that the input trigger signal is connected to the 12501.
3. Select "SYNC" in the Mini Status Display. The state indicated may be IDLE, WAIT
or STABLE, depending upon:
a) The compatibility of the trigger signal with the default state of the LEVEL,
COUPLING and SLOPE controls.
b) The input trigger signal frequency. (The Status messages are defined in Section
15.1.8).
4. Press GENERATOR START. (Although the Generator is not used as such in
Synchroniser operations, the key must be pressed to enable measurement to
proceed).
5. Press GENERATOR MENU.
6. Select [SYNCHRONISER] MENU.
7. Select and enter the required LEVEL, COUPLING and SLOPE settings.
8. Observe the Mini Status Display; lock cannot be achieved until the Display shows
either WAIT or STABLE. If further adjustments of the LEVEL and SLOPE settings
still fail to advance the displayed Status past IDLE, the definitions given in Section
15.1.8 may suggest reasons for this.
9. The next step depends upon the mode required; for Ratio, continue with step 10, for
tight or loose lock go to step 13.
10. The Ratio mode can be entered when the Synchroniser is in either the WAIT or the
STABLE STATE. Press the RATIO soft key, then enter the required number.
11. Press the SYNC soft key, select and enter [tight lock]. (As explained under Fig. 15.4,
this merely acts as the "on" switch).
12. The Mini Status Display should change to SYNC LOCKED. Now proceed to step 15.
13. Whilst it is preferable to use tight lock whenever possible, the quality of the input
trigger signal, as indicated by the Mini Status Display, may preclude this. If the
Display consistently shows WAIT or fluctuates between WAIT and STABLE, loose
lock is the best that can be achieved. However, if the Display consistently reads
STABLE, tight lock can be used.
In either case, press the SYNC soft key, then select and enter either [tight lock] or
[loose lock].
14. Watch the Mini Status Display for a consistent SYNC LOCKED message.
15. Set up the Analyzers, Display etc. as normal.
16. Make the measurement by pressing SINGLE or RECYCLE
Remember that the LEVEL, COUPLING and SLOPE settings must not be altered during
a measurement.