HP 8153A - Page 55

The output amplitude of a source can be modulated by a square wave. This
parameter sets the frequency of the modulation. The modulation can be one of
CW (continuous wave, that is no modulation), 270Hz, IkHz, or 2kHz.
Values CW, 270Hz, 1, 2kHz
Default CW
The Disp--.Ref Key
Pressing this key takes the input power-level and stores it as the reference.
Setting, or changing, the reference in this way only affects results displayed in
dB.
If the display is in dBm or Watts, the measured power-level is stored as the
reference, that is
REF =
p
measured
Where,
REF is the reference, and
Pmeasured IS the absolutc powcr-level (see “CAL”).
If the display is in dB, this value is converted to dBm or Watts before being
stored as a reference, that is
REFne^u - PdisvlayidB) + REF„u
Where,
REFnew is the reference after the key press,
Pciispiay is the displayed, relative power, and
REFoid is the reference before the key press.
Local Control - Measure Mode 2-7