Wavetek 147 Especificações Página 162

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Spectrum Analyzer Mode: Spectrum Mode Operation
138
7
TIMEBASE Submenu
Press the Timebase soft key to enter the TIMEBASE submenu.
Press this soft key to set sweep time. Increments are entered
using the up and down diamond keys. Options include
20, 10, 05, 02, 01 seconds
500, 200, 100, 50, 20, 05, 20, 10, 02, 01 milliseconds
500, 200, 100 microseconds
Press to turn sweep trigger on or off using the up and down
diamond keys. With the trigger off you get a continuous update.
With the trigger on you get updates when the carrier level has a
rising edge that crosses the horizontal center grid-line. If the
signal level never reaches trigger point, the Manual Trigger
soft key (just above this on the right side of the screen) can be
used.
This soft key adjusts the amount of level the signal must
change for a rising edge to cause a trigger event.
Edit the Desired and Undesired levels with the right and left
diamond keys.
LEVEL Submenu
Use the Level soft key to enter the LEVEL submenu, and to
return to the previous mode.
The reference level is on the top of the graph. You adjust the
reference level using the up and down diamond keys, or by
entering a numeric value followed by the Enter key.
The scale parameter (1, 2, 5, and 10 dB/div) can be adjusted
only with the up and down diamond keys. If the reference level
is set to 0 dB and the scale is set at 10 dB/div, the horizontal
grid line at the center equals -30 dB
This soft key enables and disables Trace Averaging. Use it
when you're measuring the power levels of TDMA (bursty)
transmitters such as cable modems. It's also useful when you're
measuring D/U (Desired to Undesired) signal quality.
Press to change active marker between Desired (Signal) and
Undesired (Noise). Typically, these markers are used in Zero-
Span to clearly identify digital carriers and TDMA signals.
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