Keysight N1911A Programming Manual page 129

[b] When the measurement result is linear this parameter represents the number of significant digits. When the measurement result is
logarithmic 1 to 4 represents of 1, 0.1, 0.01 and 0.001 respectively.
[c] N1912A only.
Example
CONF1:RAT DEF,4,(@1),(@2)
N1911A/1912A P-Series Power Meters Programming Guide
MEASurement Commands
This command configures the upper
window/upper measurement to make a
ratio measurement of Channel A over
Channel B, using the current sensor range
and a resolution setting of 4 on both
channels.
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