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Front Panel Operation
scan. With the CHANNEL CONTROL menu dis-
played, select this menu item by placing the cursor on
CONTROL and pressing ENTER. The following menu
will be displayed:
TRIGGER CONTROL
SOURCE ACCEPTOR
Source With this selection, the source bypass is en-
abled. The channel spacing event will be bypassed on
the first pass through the channel layer if EXTERNAL
or TRIG LINK channel spacing is selected. This will al-
low the first channel in the scan to close without hav-
ing to wait for the programmed event.
Acceptor With this selection, the source bypass is dis-
abled.
4.8.2
SCAN CONTROL
Scan control is used for the following operations:
•
To select the event that controls scan spacing.
•
Designate the NUMBER-OF-SCANS to be per-
formed.
•
Enable or disable the Source Bypass.
Perform the following steps to display the SCAN
CONTROL menu:
1. Display the CONFIGURE SCAN menu (see para-
graph 4.8, General rule #1).
2. Use the cursor keys (
on SCAN-CONTROL and press ENTER to access
the following menu:
SCAN CONTROL
SCAN-SPACING NUMBER-OF-SCANS
CONTROL
SCAN-SPACING Use this menu item to select the event
that controls the time period between scans. With the
SCAN CONTROL menu displayed, select this menu
item by placing the cursor on SCAN-SPACING and
press ENTER. The following menu will be displayed:
SELECT SCAN SPACING
TIMER EXTERNAL GPIB MANUAL
TRIGLINK IMMEDIATE HOLD
4-38
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and
) to place the cursor
Timer Use the timer feature to control scan spacing.
The timer is used to set a time interval between scans.
The timer can be set for an interval from zero to
99999.999 seconds with 0.001 second (1msec) resolu-
tion. After a scan is triggered to start, the next scan will
start at the end of the programmed timer interval. If
however, the programmed timer interval is shorter
than the time it takes to complete a single scan, the next
scan will not start until the previous scan is completed.
Note: The front panel STEP key (see MANUAL) is ac-
tive with the timer selected. Pressing the STEP key af-
ter the completion of a scan will start the next scan
(assuming the Model 7001 is programmed for another
scan; see NUMBER OF SCANS).
Perform the following steps to use the timer:
1. With the SELECT SCAN SPACING menu dis-
played, place the cursor on TIMER and press EN-
TER. A message indicating the currently set time
interval (in seconds) will be displayed:
INTERVAL = 00000.001
2. To retain the displayed timer interval, press EXIT
or ENTER. The instrument will return to the SE-
LECT SCAN CONTROL menu.
3. To set a different time interval, use the keypad to
key in the value (in seconds) and press ENTER.
The instrument will return to the SCAN CON-
TROL menu.
External With this selection, external triggers are
used to control scan spacing. A trigger stimulus ap-
plied to the Model 7001 will pass operation into the
channel layer. The external trigger is applied to the rear
panel "EXTERNAL TRIGGER" BNC connector. See
paragraph 4.10 for detailed information on external
triggering.
Note: The front panel STEP key (see MANUAL) is ac-
tive with external triggering selected. Pressing the
STEP key after the completion of a scan will start the
next scan (assuming the Model 7001 is programmed
for another scan; see NUMBER OF SCANS).
Select external triggering from the SELECT SCAN
SPACING menu by placing the cursor on EXTERNAL
and pressing ENTER. The display will return to the
SCAN CONTROL menu.
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