User`s guide

160 53220A/53230A User’s Guide
5 Triggering and Gating
Setting the Gate Time
A measurement gate time can be specified directly with the command:
[SENSe:]FREQuency:GATE:TIME {<time>|MINimum|MAXimum|
DEFault}
[SENSe:]FREQuency:GATE:TIME? {MINimum|MAXimum|DEFault}
(query form)
CONFigure and MEASure automatically set the gate source to TIME, and the
gate time according to their optional expected value and resolution parame-
ters. Specifying these parameters or using default values with these com-
mands simplifies counter programming. However, setting/changing the gate
time separate from the CONFigure/MEASure command allows you to change
only the gate time while preserving other configuration settings.
Querying the Gate Time The gate time set by the expected value and resolu-
tion parameters can be determined after execution of the CONFigure or
MEASure command.
For example, assume a measurement requiring 10-digit (mHz) resolution of a
5 MHz signal is required. Because digits of resolution is approximately equal
to Log
10
(expected value) - Log
10
(resolution), this measurement could be
configured as:
MEAS:FREQ? 5e6, 5E-4, (@1) // expected freq, resolution
A typical measurement using this configuration might return:
+4.99998458333282E+006