Agilent Technologies 4294A, Руководство по эксплуатации

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390 Appendix B
Key Definitions
Softkeys displayed by pressing the [Trigger] key
Softkeys displayed by pressing the
[Trigger]
key
Table B-56 Trigger (Trigger) menu
Key operation: [Trigger]
Softkey Function GPIB command
HOLD
| Selects the sweep stop. The status indication area at the left side of the screen
shows “Hld.” After the stop of the sweep, if “*” is displayed at the top of the
status indication area, it indicates that the sweep was stopped before completion
and therefore the data trace has not been updated completely. To update the data
trace completely, press the SINGLE key to execute a new single sweep. HOLD
SINGLE
| Performs a single sweep to update the data trace and then goes into the sweep
stop status. SING
NUMBER OF GROUPS
| Sets the sweep group count (the number of sweeps specified by users). When the
user finishes entry of the sweep group count with the numeric keys, the sweeps
are started. After the sweeps of the specified count, the sweep stop status occurs.
If the sweep-to-sweep averaging function is on, specify a sweep group count
equal to or larger than the averaging factor (count) to execute averaging
completely. When the group count is entered, the averaging counter is reset to 0
and the sweeps are started. Specify an integer between 0 (no sweep) and 999 for
the sweep group count. NUMG <value>
CONTINUOUS Selects the automatic continuous sweep mode. The trace is updated for each
sweep. CONT
SOURCE [ ]
ä
Displays Table B-57, “Trigger source (Trig source) menu,” on page 390. In [ ] of
the softkey label, the currently selected trigger source is displayed (internal
trigger: [FREE RUN], external trigger input terminal: [EXTERNAL],
GPIB/LAN: [HP-IB], or manual: [MANUAL]). (N/A)
Table B-57 Trigger source (Trig source) menu
Key operation: [Trigger] - SOURCE [ ]
Softkey Function GPIB command
FREE RUN
| Selects the internal trigger mode (free run), in which triggers are automatically
generated inside the 4294A. TRGS INT
EXTERNAL
| Selects triggers from the external trigger input terminal (BNC(f) connector) on
the rear panel. TRGS EXT
HP-IB/LAN
| Selects triggers via GPIB or LAN. If this mode is selected, you can generate
triggers from the external controller using the *TRG command. TRGS BUS
MANUAL Selects manual triggering. After the selection, pressing the MANUAL key
generates a single trigger. TRGS MAN
EVENT [ ] Selects applying a trigger to each measurement point [ON POINT] or to each
sweep [ON SWEEP]. This configuration is valid for each trigger mode of
EXTERNAL, GPIB/LAN, and MANUAL described above. For FREE RUN,
this key has no meaning. TRGEVE {SWE|POIN}
EXT POLRTY [ ] Selects the polarity of the trigger signal supplied from the external trigger input
terminal on the rear panel. [POS] means positive polarity, and triggers are
generated by detecting the rise of the TTL signal. [NEG] means negative
polarity, and triggers are generated by detecting the fall of the TTL signal. TRGP {POS|MEG}