Agilent Technologies N1996A-503 User Reference page 225

Stop Freq
Use this key to specify the Stop Frequency of your frequency range.
Mode
Dependencies /
Couplings
Preset
State Saved
Range
Key Path
Start Distance
Use this key to specify the Start Distance of the cable you wish to measure.
The start distance you can enter cannot be greater than the distance displayed in the
Measured Distance window at the top right. If you need a larger distance, reduce the
frequency span by adjusting the start and stop frequencies.
If your Start Distance is 0 m (0 ft.), you will see a peak corresponding to 0 m (0 ft.). This is
caused by reflection from the junction between your analyzer and the cable under test.
This DC component, sometimes referred to as the "dead zone", does not necessarily
indicate a problem, but be sure that this connection is tight and clean.
Mode
Min
Max
Key Path
Stop Distance
Use this key to specify the Stop Distance of the cable you wish to measure.
The stop distance you can enter cannot be greater than the distance displayed in the
Chapter 3
Stimulus / Response
You cannot set the Start frequency equal to the Stop frequency.
The instrument will alter the value of the last setting to
maintain a minimum value of 1 kHz difference between the
Start and Stop frequencies.
1.99 GHz
Saved in instrument state.
From 10.001 MHz to 3.02 GHz (Option 503) / 6.02 GHz (Option
506)
FREQ/Channel, Stop Freq
Stimulus / Response
0 m (if Unit is Meters)
0 ft. (if Unit is Feet)
304.8 m (if Unit is Meters)
1000 ft. (if Unit is Feet)
FREQ/Channel, Start Distance
Mode
Distance To Fault
225