Agilent Technologies N1996A-503 User Reference page 222

Mode
Distance To Fault
Reference Level
Sets the reference level value used for amplitude measurements. In the Distance to Fault
measurement, this Reference Level represents return loss in dB.
Example of conversion between a "VSWR" and a "Return Loss"
VSWR = 1.01 => Return Loss = 46.1 dB
VSWR = 6 => Return Loss = 2.9 dB
Changing the value of the reference level changes the absolute return loss level of the top
graticule line. The reference level (in selected amplitude units) can be set with the step
keys, knob, or numeric keypad.
Mode
Preset
State Saved
Range
Key Path
Scale/Div
Sets the logarithmic units per vertical graticule division on the display.
Mode
Preset
State Saved
Range
Key Path
FREQ/Channel
Mode
Key Path
222
Stimulus/Response
1 dB
Saved in State
–10 dB to 150 dB
AMPTD Y Scale, Reference Level
Stimulus/Response
1 dB
Saved in State
1 to 20
AMPTD Y Scale, Scale/Div
Stimulus / Response
Front-panel key
Chapter 3