Test Circuits - ABB ETL600 Instruction Manual

Revision:
A
5

Test circuits

RF Hybrid
not to be
plugged
Notes:
1. For checking the signal path from P4LT to BNC IN of P4LM, switch S1 of P4LM can be put to
position SET. Then BNC IN of P4LM is directly connected to BNC OUT of P4LM.
2. Normally S1 of P4LM is set to NORM.
3. On P4LM, jumper S3 has to be in position L1 to tune P4RX coil L1 and in position L3(!) to tune
P4RX coil L2. Position L2 of jumper S3 on P4LM is not used!
ON
OFF
S1
S3
S2
A B
FUNCTION
OUT
P3LL
L1
L2
P4RX
U
OUTPUT
Figure 1: Test circuit for tuning L1 and L2 on P4RX
Language: Page:
EN 6/7
P1LA
L2
L1
FILTER
TUNE
FILTER
Ext.Coaxial Cable
S3
L1
L2
IN
L3
OUT
SET TUNE
NORM FILTER
S1
P4LM
50 / 75Ω/∞
1KHW001491-EN
P4LT
S2
P7LC