HP 8591C, Руководство пользователя, Страница: 121 / 373

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System Measurements
Making System Measurements
Step 6. Make the measurements now
This procedure describes how to initiate immediate testing. For information
on making measurements at a later time, refer to “Making Timed System
Measurements” later in this chapter.
Press Measure
Press Yes if you want to measure system or No if not. If Yes
is selected, system will be measured using the channel specified
using the SYS BTS TST CHNL located in the Setup menu.
The default is channel 4. System CTB will be measured using the offset
specified by the
OFFSET located in the Setup menu.
The default value is 6 MHz above the test channel’s visual carrier. System
CSO will be measured using the offset specified by the CSO FREQ OFFSET
located in the Setup menu. The default value is 4.75 MHz above
the test channel’s visual carrier,
Alternatively, set the SYS BTS TST CHNL to the highest channel in
the system. If there are no signals just above the top channel, set the
CSO FREQ OFFSET to 7.25 MHz. These settings will measure the CTB
and + 1.25 MHz CSO beats in the clear just above the top channel. If
there are signals just above the top channel, such as digital music signals,
add increments of 6 MHz to the CTB and CSO offsets until a spot in the
clear is found. However, going too far into roll-off can compromise the
measurement results.
3. You can select whether results are to be printed (if you have a printer
connected to the analyzer), stored on a RAM card, or sent to the screen:
If you want the data sent to the screen, press DUMP to SCREEN
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