Руководство По Установке для Cisco Cisco Prisma II EDR Receiver
78-715189-01 Rev C
Operation
3-7
Checking the Operating Settings
Preparing to Record Operating Data
To ensure that the amplifier is operating properly, it is recommended to periodically
monitor and record operating data. Having a record of operating data also
establishes a baseline of unit performance for use in maintenance and
troubleshooting.
Before you begin, gather the equipment and tools listed in the following table:
Before you begin, gather the equipment and tools listed in the following table:
You Need . . .
To . . .
a Maintenance Log
record new data and compare it against
data recorded earlier.
a spectrum analyzer
verify proper HEDA operation.
a 75 ohm coax cable with an F-
connector
connect to the spectrum analyzer to the
amplifier test point.
1/8-in. flat-blade screwdriver
adjust the PAD and TILT settings, as
needed.
Check the RF Input
Complete the following steps to verify that the input level is within ±1.0 dB of the
value most recently recorded.
1.
Connect an RF cable from the -20 dB RF TEST point on the front of the
amplifier to the spectrum analyzer.
2.
Set the spectrum analyzer for the frequency span of your band of operation.
3.
Measure the signal level of the RF input test point.
4.
Check that the input level to the amplifier is within ±1.0 dB of the proper
value. Remember to add 20 dB back to the measured RF TEST level to get the
correct reading.
Note: If the reading is not within the proper range, refer to Chapter 4 for
Note: If the reading is not within the proper range, refer to Chapter 4 for
assistance in troubleshooting.
5.
To complete weekly maintenance, go to the next procedure, Checking RF
Output.