HP 53181A Programming Manual page 219

Commands Reference
Measurement Instructions (:CONFigure, :FETCh, :MEASure, :READ)
Descriptions of the Measurement Functions— <function> (Cont.)
:MEASure[:SCALar][:VOLTage]:FREQuency:RATio?
[<expected_value>[,<resolution>]]
[, (@1), (@2) | (@2), (@1) ]
Measures Frequency Ratio between two inputs.
The measurement arming mode is set to "digits." The Counter uses the
<expected_value> and <resolution> parameters to configure the number of digits of
resolution arming setting.
The Channel 1 trigger settings are coupled so that the measurement channel has
auto-trigger enabled at 50% with a positive slope.
<expected_value>
Ch1
range for
:
Ch2
Ch2
range for
:
Ch1
resolution:
default:
<resolution>
description:
Ch1
range for
:
Ch2
Ch2
range for
:
Ch1
Descriptions of the Measurement Functions— <function> (Cont.)
:MEASure[:SCALar][:VOLTage]:FREQuency:RATio? (Continued)
1.00E-10 to 1.00E11
1.00E-11 to 1.00E10
<expected_value> should be within 10% of ratio for
optimum arming configuration
1
value indicates decade corresponding to least significant
digit of the result
1E-25 to 1E8
value which indicates 3 to 15 digits of resolution for the
specified <expected>
1E-26 to 1E7
value which indicates 3 to 15 digits of resolution for the
specified <expected>
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