Monarch Instrument DC1250 - Manual (Page 32)

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4.8 SAMPLE TRIGGER
This option allows the user to program what will trigger a change of sample rate in the
displayed or recorded data. Use the Up Arrow (▲) or Down Arrow (▼) buttons to scroll and
highlight SAMPLE TRIG.. and press the MENU button. The menu options are shown
below.

Note that if an event is selected to change the sample rate, when exiting the menu
the sample rate menu will be displayed. Use the Up Arrow (▲) or Down Arrow (▼)
buttons to scroll and highlight the new sample speed and press the MENU button to
select and the Left Arrow (◄) button to exit.
OFF No Sample Rate change if checked
ALARM 1 Sample Rate change on Alarm 1
ALARM 2 Sample Rate change on Alarm 2
ALARM 3 Sample Rate change on Alarm 3
ALARM 4 Sample Rate change on Alarm 4
EXT INPUT Sample Rate change on External Input
4.9 RECORD TRIGGER
This option allows the user to choose an event to start the recording. Use the Up Arrow (▲)
or Down Arrow (▼) buttons to scroll and highlight REC. TRIG.. and press the MENU
button. Select either OFF, ALARM 1 through 4 or EXTERNAL INPUT as the record trigger.

Note that if an alarm reset delay is set (see Section 4.2), the unit will continue to
record for this time period AFTER the alarm has gone away.
4.10 EXTERNAL INPUT
This option allows the user to program the external digital input. This needs to be
programmed before it can be used for event triggering if programmed above. Use the Up
Arrow (▲) or Down Arrow (▼) buttons to scroll and highlight EXT. INPUT.. and press the
MENU button. The menu options are shown below.
ENABLE Enable External Input
HIGH External Sense is HIGH to register. (> 5V)
LOW External Sense is LOW to register (=0V)
HOLD OFF Time in seconds from EXT input present till recognized
RESET DELAY Time in seconds from EXT input absent till recognized
LATCHING Once set, will remain set till the RESET option is pressed
LOCK OUT
External Input requires a change of state in order to be recognized.
For a High condition on startup or reset, if the input is high at that time
it needs to go low first, then high in order to be recognized.
DEFAULT Set Defaults - Disabled, High level, all else set to zero
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