5 Triggering and Gating
170 Keysight 53220A/53230A User’s Guide
Frequency measurements
For frequency and period measurements the command used to set/change the
gate source is:
[SENSe:]FREQuency:GATE:SOURce {TIME|EXTernal|INPut[1]| INPut2|ADVanced}
[SENSe:]FREQuency:GATE:SOURce? (query form)
– gate source TIME is used to achieve a desired resolution in number of digits. It
uses an internal gate signal and is the default gate source. It enables the gate
to remain open for a specified period while the input signal is measured. The
longer the gate time, the greater the resolution.
Resolution and gate time
Reading resolution (in digits) is a function of the counter’s gate time,
measurement mode (AUTO, CONTinuous, RECiprocal - Chapter 3), and
resolution enhancement algorithm. Resolution enhancement (R
E
), which is
defined in the 53220A/53230A data sheet, extends the resolution beyond what is
achieved with the basic reciprocal measurement technique. Resolution
enhancement applies to the counter’s AUTO or CONTinuous mode with gate times
>
10 msec.
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