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