Fluke PM6685R User Manual

Command Reference 9-49

:INPut :LEVel :AUTO

PM6680B PM6681

8 «<Boolean>|ONCE»

Autotrigger

If set to AUTO, the counter automatically controls both the trigger level and the at-

tenuation

. If you have a stable amplitude, use the :AUTO 8 ONCE, and the

autotrigger will determine the trigger level once and then set a fixed level.

From the bus, input A and input B are always set to autotrigger individually.

Parameters:

<Boolean> = ( 1/ON | 0/OFF )

ONCE means that the autotrigger switches on, checks the signal, stores the trigger

levels as manually set levels, and then switches off auto. This improves measuring

speed.

Example for Input A (1)

SEND® :INP:LEV:AUTO 8 OFF

Example for Input B (2)

SEND® :INP2:LEV:AUTO 8 ON

Returned format:

1|0¿

*RST condition

The autotrigger function normally sets the trigger levels to 50 % of the signal ampli-

tude. Two exceptions exists however:

Rise/Fall time measurements: Here the input 1 (A) trigger level is set to 10% and

the Input 2 (B) trigger level is set to 90% of the amplitude.

Variable Hysteresis mode (channel 7): The input 1 (A) trigger level is set to 75%

and the Input 2 (B) trigger level is set to 25% of the amplitude