Chapter 4
Front-Panel Key and SCPI Command Reference
Measurement keys
258
Front-Panel Key and SCPI Command
Reference
4.4.11.1.3 Ratio Reference
If audio AC level is to be displayed relative to a reference, enter the value as a ratio reference using this key.
4.4.11.1.4 Ratio Mode
The ratio and previous ratio functions permit any measurement result to be scaled to a reference. The reference
may be either a measurement result or a keyboard entry. The Log/Linear key enables measurement results to be
displayed in linear or logarithmic units. In the Ratio mode, measurements are made in the same way as when not
in the Ratio mode. However, before the result is displayed, the internal controller converts it to ratio. The
following equations are used for computing ratio:
(M/R) * 100 % = % ratio for linear display,
20 * log (M/R) = dB ratio for logarithmic display,
where M is the measurement result and R is the ratio reference.
Range: V|mV|uV|dBV|dBmV|dBuV
Example: :DISP:AUDL:UNIT V
:DISP:AUDL:UNIT?
Key Path:
Amplitude/Y Scale
Remote Command: :DISPlay:AUDLevel:RREFerence <real>
:DISPlay:AUDLevel:RREFerence?
:DISPlay:AUDLevel:RREFerence:AUTO 0|1|OFF|ON
:DISPlay:AUDLevel:RREFerence:AUTO?
Preset: 100mV
State Saved: Saved in instrument state.
Min: 1mV
Max: 20V
Example: :DISP:AUDL:RREF 100mV
:DISP:AUDL:RREF?
:DISP:AUDL:RREF:AUTO OFF
:DISP:AUDL:RREF:AUTO?
Key Path:
Amplitude/Y Scale
Remote Command: :DISPlay:AUDLevel:RMODe LOG|LINear
:DISPlay:AUDLevel:RMODe?
Preset: LOG
State Saved: Saved in instrument state.
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