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HP4402.book : chapter2.fm 24 Wed Apr 23 15:29:05 1997
Power Meter Operation
Making Relative Measurements
2-24 HP EPM-442A User’s Guide
Making Relative Measurements
Relative mode allows you to compare any measurement result to a
reference value. The relative reading can be displayed in either dB or % by
pressing and selecting either or . When the measurement
result is displayed in % a prefix multiplier may be shown.
Relative mode is window dependent and when enabled displays “Rel” in
the window to which it’s applied.
Relative measurements cannot be output via the rear panel Recorder
Output.
Procedure
To set a reference value on the currently selected window:
1. Press .
2. Press to use the current reading as the reference value. This
allows you to compare any measurement result in dB or
percentage (%).
3. is automatically set to “On” when is pressed.
Successive measurements are now displayed relative to the reference
value. The relative mode can be disabled and re-enabled simply by
pressing .
dBm/W
dB %
Rel
Offset
Rel
Rel Off On Rel
Rel Off On