Fluke PM6685R User Manual

Command Reference 9-63

:MEASure :FALL :TIME?

PM6680B PM6681

[8 [<lower threshold> [,<upper threshold>[,<expected value>[,<resolution>]]]] [,(@1)]]

Fall-time

The transition time from 90% to 10% of the signal amplitude is measured.
The measurement is always a single measurement and the Auto-trigger is always

on, setting the trigger levels to 90% and 10 % of the amplitude. If you need an av-

erage transition time measurement, or other trigger levels, use the :SENSe sub-

system and manually set trigger levels instead.

Parameters:

<lower threshold>, <upper threshold>, <expected value> and <resolution are all ignored by

the counter

<(@1)> is the channel to measure on, i.e., input A

Complies to standards:

SCPI 1991.0, confirmed.

:MEASure :FREQuency :RATio?

PM6680B/81/85

[8 [<expected value> [,<resolution>]][,<(@«1|2|3|4|5|6»)>,<(@«1|2|3|4|5|6»)>]]

Frequency Ratio

Frequency ratio measurements between two inputs.

Example:

SEND® :MEAS:FREQ:RAT? 8 (@1),(@3)

READ¬ 2.345625764333E+000

This example measures the ratio between input A and input C.

The channel is expression data and it must be in parentheses ( ).

Parameters:

<expected value> and <resolution> are ignored

<(@«1|2|3|4|5|6»)>,<(@«1|2|3|4|5|6»)> is the channels to measure on:

(@1) means input A

(@2) means input B (Only PM6680B and PM6681)

(@3) means input C (HF-input option)

(@4) means input E (Rear panel arming input)

(@5) means input A prescaled by 2

(@6) means the internal reference

If you omit the channel, the instrument measures between input A and input E.

Complies to standards:

SCPI 1991.0, confirmed.