Agilent Technologies E4448A Manual

Chapter 4
Front-Panel Key and SCPI Command Reference
Measurement keys
213
Front-Panel Key and SCPI Command
Reference
4.4.5.2.1.3 Ratio Reference
If FM Deviation is to be displayed relative to a reference, enter the value as a ratio reference using this key.
4.4.5.2.1.4 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.
Mode: MRECEIVE
Key Path:
Amplitude Y Scale
Remote Command: :DISPlay:FMDeviation:RREFerence <freq>
:DISPlay:FMDeviation:RREFerence?
:DISPlay:FMDeviation:RREFerence:AUTO 0|1|OFF|ON
:DISPlay:FMDeviation:RREFerence:AUTO?
Preset: 1.000Hz
State Saved: Saved in instrument state.
Min: 1Hz
Max: 800kHz
Example: :DISP:FMD:RREF 10
:DISP:FMD:RREF?
:DISP:FMD:RREF:AUTO OFF
:DISP:FMD:RREF:AUTO?
Mode: MRECEIVE
Key Path:
Amplitude Y Scale
Remote Command: :DISPlay:FMDeviation:RMODe LOG|LINear
:DISPlay:FMDeviation:RMODe?
Preset: LOG
State Saved: Saved in instrument state.
Range: Log | Linear
Example: :DISP:FMD:RMOD LOG
:DISP:FMD:RMOD?

Agilent Technologies E4448A Specifications

General

Brand	Agilent Technologies
Model	E4448A
Category	Measuring Instruments
Language	English