ABB ETL600, Instruction Manual, Page: 368 / 382

Revision: Language: Page:
A EN 2/2
1KHW001497-EN
2 Anomalies
For each anomaly, the following information is given:
- the types of the hardware modules and/or the versions of firmware or software taken to be
responsible for the observed anomaly,
- a description of the anomaly,
- a workaround (if any).
2.1 Deviation of level measured at the socket “RF line monitor” of P3LE
2.1.1 Hardware types, software and/or firmware versions
RF hybrid P3LE.
2.1.2 Description
The level measured at the socket "RF line monitor" deviates from its rated level (50 dB below the
power at the RF output) as follows:
Impedance Deviation Measured level at “RF line monitor” socket [dBm @ 50 Ohm]
45 Ohm -0.5 dB RF output power [dBm] – 50.5 dB
75 Ohm +1.8 dB RF output power [dBm] – 48.2 dB
125 Ohm +4.1 dB RF output power [dBm] – 45.9 dB
2.1.3 Work around
Apply the corrections given in the table above when performing measurements at the "RF line monitor"
socket.
Examples:
1) At the socket "RF line monitor", a level of -12.2 dBm @ 50 Ohm is measured. The line impedance
is 75 Ohm. What is the power at the RF output?
Answer: The power at the RF output is (-12.2 + 48.2) dBm = +36dBm.
2) When adjusting the Tx RF level for +46 dBm PEP, a rated level of -14.1 ... -13.9 dBm @ 50 Ohm is
specified in the dialog box Adjust Tx RF level for the "RF line monitor" socket. The line impedance
is 75 Ohm. Which is the range for the level to be measured at the "RF line monitor" socket if the RF
output power has to be set to 46 dBm PEP?
Answer: The tuning tone level must be adjusted until the measured level at the socket "RF line
monitor" is in the range (-14.1 ... -13.9 dBm @ 50 Ohm)+1.8 dB = -12.3 ... -12.1 dBm @ 50 Ohm.