Chapter 4 219
Key Function Descriptions
Key Descriptions
Front-panel key access: AUTO COUPLE
AUX CTRL Accesses the softkeys that control auxiliary functions,
for example, the tracking generator and AM or FM
demodulation.
AUX CTRL accesses TRACKING
GENRATOR, INTERNAL MIXER, EXTERNAL
MIXER, AM/FM DEMOD, and REAR PANEL.
Front-panel key access:
AUX CTRL
AVERAGE CNV LOSS Displays the mean conversion loss for the current
harmonic and allows you to enter new conversion loss
data. In a full frequency band (such as K band), the
mean conversion loss is defined as the minimum loss
plus the maximum loss for that band divided by two. To
change the maximum and minimum values, use CNV
LOSS VS FREQ. Any change to the average conversion
loss also affects the flatness data, which is described in
Table 4-1 on page 184.
The default conversion loss value for each band is 30
dB.
Front-panel key access:
AUX CTRL
AVG "OFF"POWER Measures the average power of a burst carrier
during the time that the carrier is off. The
measurement should be made in zero span. The
resolution bandwidth should be nearly as wide as (or
wider than) the modulation bandwidth, during the
on-time of the pulse.
The off-time is determined by the transitions through a
power level 20 dB below the peak level. Trace data
following a trailing edge or preceding a leading edge is
used, except when it is close enough to the edge to
possibly be due to resolution bandwidth and video
bandwidth response times.
If the rising or falling performance of the burst signal to
be tested is slow compared to the resolution
bandwidth/video bandwidth responses, the transition
power will be measured as part of the average off
power. In this case, reducing the resolution bandwidth
is recommended.
Front-panel key access:
MEAS/USER
AVG "ON"POWER Measures the average power of the carrier during
that portion of the time when the burst is on (within 20
dB of its peak level). The true mean carrier power is
calculated. This is done by measuring the time
waveform of the RF envelope, converting the trace data
from dB to power units, and then averaging the power
trace data.
To Next Page
Loading...
Need help?
General
