Det/Demod - HP ESA-L1500A User's And Calibration Manual

Front-Panel Key Reference

Det/Demod

Det/Demod
Det/Demod
detector functions, the speaker, and dwell time.
accesses the
Detector
Peak
selected, Smpl appears in the upper-left corner of the screen. Sample
detection is used primarily to display noise or noise-like signals. This
detection should not be used to make the most accurate amplitude
measurement of non noise-like signals. In sample mode, the
instantaneous signal value at the present display point is placed in
memory. Sample detection is activated automatically for noise level
markers or during video averaging.
When peak detection is selected, Peak appears in the upper-left corner
of the screen. Peak detection is used primarily when measuring signals
out of the noise floor. Peak detection obtains the maximum video signal
between the last display point and the present display point and stores
this value in memory. Peak detection is selected at power on and by
pressing
Negative peak detection functions the same as peak detection, but
selects the minimum video signal. When Negative Peak is selected, Neg
appears in the upper- left corner of the screen. Negative peak detection
is used to find signals that are close to, but below the noise floor. This
detection should not be used to make the most accurate amplitude
measurements of signals. Key Access:
accesses the softkeys to select
Demod
Off
turns the internal speaker on and off. The volume from the speaker is
Speaker On Off
controlled by the front-panel volume control knob. Pressing
Speaker On Off
It is normal to hear clicking sounds when the Auto Alignment function
NOTE
is On and the analyzer is in Zero Span. During retrace, a small portion
of the analyzer circuitry is realigned using relays. It is the rapid
switching of these relays during retrace that causes the clicking sounds.
To eliminate the clicking sounds, set Auto Alignment Off. When this is
done, the Align Now All function should be performed periodically.
Refer to "Specifications and Characteristics" for more information on
how often to perform Align Now All when Auto Align is Off.
Key Access:
74
accesses the softkeys controlling demodulation functions,
menu keys which allow you to select between
Detector
, , and
Sample Negative Peak
.
Preset
. Key Access:
Det/Demod
to On.
Det/Demod
detection. When sample detection is
Det/Demod
demodulation or turn demodulation
AM
sets
Preset
Chapter 4