5 Triggering and Gating
140 Keysight 53210A User’s Guide
Querying the Gate Time
The gate time set by the expected value and resolution parameters can be
determined after execution of the
CONFigure or MEASure command.
For example, assume a measurement requiring 9-digit (10 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-3, (@1) // expected freq, resolution
A typical measurement using this configuration might return:
+4.99999949990003E+006
With the counter display registering:
4.999 999 50MHz (9 digits)
Querying the gate time after sending this command returns:
SENS:FREQ:GATE:TIME?
+1.00000000000000E-001 (100 ms)
From Table 5-2 this corresponds to 9 digits of resolution. To achieve a desired
resolution (digits) in terms of gate time, locate the number of digits in Table 5-2
and select the corresponding gate time:
SENS:FREQ:GATE:TIME 100e-3 // set gate time = 100 ms
SENS:FREQ:GATE:SOUR TIME // set gate source
As another example, assume a measurement requiring 7-digit resolution of a 5 ns
(200 MHz) signal. Recalling that
Log
10
(expected value) - Log
10
(resolution) is
approximately equal to digits of resolution, the measurement can be configured
as:
MEAS:PER? 5E-9, 5E-16, (@1) // per meas of 200 MHz signal
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