User`s guide

146
Chapter 4 Features and Functions
Alarm Limits
• Track Mode: In this mode, the corresponding output line is asserted
only when a reading crosses a limit and remains outside the limit.
When a reading returns to within limits, the output line is
automatically cleared. You can manually clear the output lines at any
time (even during a scan) and the alarm data in memory is not
cleared (however, data is cleared when you initiate a new scan). The
alarm outputs are also cleared when you initiate a new scan.
• You can control the slope of the pulse from the alarm outputs (the
selected configuration is used for all four outputs). In the falling edge
mode, 0V (TTL low) indicates an alarm. In the rising edge mode, +5V
(TTL high) indicates an alarm. A Factory Reset (*RST command) will
reset the slope to falling edge.
Note: Changing the slope of the output lines may cause the lines to
change state.
• Front-Panel Operation: To specify if you want to manually clear all
four alarm outputs, choose from the following items.
DO NOT CLEAR , CLEAR OUTPUTS
To select the output configuration for all four output lines, choose
from the following items.
LATCH ON FAIL , TRACK PASS/F
To configure the slope of all four output lines, choose from the
following items.
FAIL = HIGH , FAIL = LOW
Falling Edge Rising Edge
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