Keithley 2001 Operator's Manual page 94

Front Panel Operation
To select bus triggering from the SELECT SCAN SOURCE
menu, place the cursor on GPIB and press ENTER. The
display returns to the SETUP SCAN LAYER menu.
TRIGLINK: With this selection, the scan source is
controlled by the Trigger Link of the Model 2001. Trigger
Link is an enhanced trigger system that uses up to six lines
to direct trigger pulses to and from other instruments.
Operation passes into the measure layer when the Model
2001 receives a trigger over the Trigger Link. See
3.7.7 for details on using the Trigger Link.
Front panel TRIG key (see MANUAL) is
active with the Trigger Link selected.
Pressing the TRIG key passes operation
into the measure layer.
To select the Trigger Link from the SELECT SCAN
SOURCE menu, place the cursor on TRIGLINK and press
ENTER. The following menu is displayed:
SELECT INPUT LINE
#1 #2 #3 #4 #5 #6
The position of the cursor indicates the presently selected
input line.
To select a trigger input line for the Model 2001, place the
cursor on the desired line number and press ENTER. The
following message is displayed:
SELECT OUTPUT LINE
#1 #2 #3 #4 #5 #6
The position of the cursor indicates the presently selected
output line.
To select a trigger output line for the Model 2001, place the
cursor on a different line number and press ENTER. The
instrument returns to the SELECT SCAN SOURCE menu.
Note that you cannot use the same trigger line for both input
and output.
TIMER: Use the timer feature to control the time interval
between scan sequences when scanning. The timer can be set
for an interval from 0.001 seconds (1msec) to 999999.999
seconds with 1msec resolution.
After a scan sequence is triggered to start, the next scan
sequence starts at the end of the programmed timer interval.
If however, the programmed timer interval is shorter than the
3-62
paragraph
NOTE
time it takes to complete a single scan sequence, the next
scan sequence does not start until the previous one is done.
Front panel TRIG key (see MANUAL) is
active with the timer selected. Pressing the
TRIG key after the completion of a scan
sequence starts the next scan sequence
(assuming the Model 2001 is programmed
for another scan sequence; see COUNT).
Perform the following steps to use the timer:
With the SELECT SCAN SOURCE menu displayed, place
the cursor on TIMER and press ENTER. A message
indicating the presently set time interval (in seconds) is
displayed:
INTRVL = 000001.000
1. To retain the displayed timer interval, press EXIT or
ENTER. The instrument returns to the SELECT SCAN
SOURCE menu.
2. To set a different time interval, use the cursor keys (
) to select the digits, and the RANGE  and 
and
keys to increment and decrement the digits. Press EN-
TER when done to return to the SELECT SCAN
SOURCE menu.
HOLD: When HOLD is selected, the scan source is
suppressed. As a result, operation does not pass into the
measure layer until HOLD is cancelled by selecting one of
the other scan source selections. Select HOLD from the
SELECT SCAN SOURCE menu by placing the cursor on
HOLD and pressing ENTER. The instrument returns to the
SETUP SCAN LAYER menu.
DELAY
This delay is used to hold up operation in the scan layer.
After the scan event occurs, the instrument waits until the
delay period times out (0 to 999999.999sec) before
proceeding to the measure layer.
COUNT
This menu item defines the number of times operation
returns to the scan layer. With the SETUP SCAN LAYER
menu displayed, select this menu item by placing the cursor
on COUNT and pressing ENTER. The following menu is
displayed:
NUMBER OF SCANS
INFINITE ENTER-SCAN-COUNT
2001-900-01 Rev. K/ August 2010
NOTE