Keithley 2701, User Manual

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Model 2701 User’s Manual Limits and Digital I/O 9-11
• LSENSE — Use to select the logic sense: active HIGH or active LOW. With
active high selected, an output will be at approxi5V when a reading is at or
exceeds the limit. Conversely, with active low selected, an output will be at 0V
when a reading reaches or exceeds the limit.
• MASTR LATCH — Use to enable (Y) or disable (N) the master limit latch. When
enabled, the master limit remains latched when a reading limit is reached or
exceeded. When disabled, the master limit line releases immediately when the
reading is inside all four limits.
Perform the following steps to enable and configure digital outputs:
1. Press SHIFT and then OUTPUT.
2. If the digital output is already on (DOUTPUT: ON), proceed to step 3. Otherwise,
press
to move the cursor to the right, press or key to display “ON,” and
press ENTER.
3. Use the key to display the master limit latch (MASTR LATCH) setting: N (no)
or Y (yes).
4. If you want to retain the present master limit setting, proceed to step 5. Otherwise,
press to move the cursor to the right, press or key to display “Y” or “N,” and
press ENTER.
5. Use the key to display the present logic sense (LSENSE) setting: HIGH or LOW.
6. If you want to retain the present logic sense setting, proceed to step 7. Otherwise,
press
to move the cursor to the right, press or key to display “HIGH” or
“LOW,” and press ENTER.
7. Use the key to display the present PULSE mode setting: NO or YES.
8. To retain the present pulse mode setting, press ENTER. Otherwise, press to
move the cursor to the right, press or key to display “NO” or “YES,” and press
ENTER.
Scanning
While limits can be configured on a per scan channel basis, the digital output configura-
tion cannot. Therefore, for all scan channels that are set to use limits, the digital output
will function according to how the Model 2701 is set up when the scan is run.
Table 9-1
OUTPUT menu
Menu item Setting Description
DOUTPUT ON or OFF Enable/disable digital outputs.
PULSE YES or NO Enable/disable digital pulse output.
LSENSE HIGH or LOW Select logic sense.
BEEP NEVER, INSIDE, or OUTSIDE Set beeper for limits (see “Limits” for details).
MASTR LATCH Y or N Enable/disable master limit latch.
2701-900-01.book Page 11 Wednesday, August 3, 2011 9:43 AM