ABB ETL600, Инструкция по эксплуатации, Страница: 279 / 382

Revision:
A
Language:
EN
Page:
3/7
1KHW001492-EN
3 Tuning the filter circuits individually
Once the Tx filter is programmed for the required frequency band, its individual circuits can be
tuned with the tuning adapter P3LL and the HMI600. The DSP module P4LT/P4LU is used to
generate and inject the tuning frequency into the transmitter filter via the output amplifier stage
P1LA. The Tx tuning adapter provides facility for checking the selectivity.
3.1 Use the following steps in case of the 40 W units
Refer to the test circuit in section 5.1.
1. The Tx tuning adapter is inserted in place of the RF hybrid (P3LE) and the RF hybrid is
plugged on top of it. The U
output
of the adapter P3LL is connected to the selective level meter in
the wideband range and in high input impedance mode.
2. If not already done, switch on the power of the ETL600, start up the HMI600 on the PC, log on
to the local ETL600 using equipment ID 0 and upload configuration and status of the
equipment.
3. Choose the Equipment menu and click Tuning & testing .
4. A warning dialog box appears, click OK.
5. Click Tune Tx RF filter to get the Tuning Tx RF filter dialog box.
6. Check if the correct filter center frequency f0 and bandwidth are shown.
7. For tuning the coil L1 set the adapter P3LL to:
•
FUNCTION : A
•
Position of S1 : L1, FILTER
•
Position of S2 : TUNE
•
Position of S3 : OFF
•
Position of LOAD : LINE
Click Activate f1 . Using coil L1, U
output
is tuned to a minimum or if an end stop is reached go
to
Step A1
.
8. For tuning the coil L2 set the adapter P3LL to:
•
FUNCTION : A
•
Position of S1 : L2, FILTER
•
Position of S2 : TUNE
•
Position of S3 : OFF
•
Position of LOAD : LINE
Click Activate f2. Using coil L2, U
output
is tuned to a minimum or if an end stop is reached go
to
Step A1
.
9. Terminate the action by clicking deactivate frequency and to return to the Tuning & testing
main menu click Cancel .
3.2 Use the following steps in case of the 80 W units
Refer to the test circuits in section 5.1.
1. The Tx tuning adapter is inserted in place of the RF hybrid (P3LE) in the lower rack and the
RF hybrid is plugged on top of it. The Tx RF filter (E5TX) in the upper rack must be removed.
The other units in both racks remain in place. The U
output
of the adapter P3LL is connected to
the selective level meter in the wideband range and in high input impedance mode.
2. If not already done, switch on the power of the ETL600, start up the HMI600 on the PC, log on
to the local ETL600 using equipment ID 0 and upload configuration and status of the
equipment.
3. Choose the Equipment menu and click Tuning & testing .
4. A warning dialog box appears, click OK .