Rohde & Schwarz SME02 - Overvoltage Protection (SME02 and SME03 Only); Level Monitoring at Input EXT1

SME Test Procedure
1038.6002.02 5.19 E-13
5.2.14 Overvoltage Protection (SME02 and SME03 only)
Caution:
SME06 is not protected against overvoltage. To prevent damages to the unit
– never apply a DC. voltage to the RF output connector
– never apply more than the maximum permissible RF power (30 dBm) to the
RF output connector.
Test equipment - Adjustable d.c. voltage source (Section 5.1, item 12)
- Signal generator (Section 5.1, item 5)
- Power amplifier (Section 5.1, item 13)
Test setup Connect an adjustable d.c. voltage source to the RF output socket of
the SME via a 50-Ohm resistor or a signal generator with a
subsequent power amplifier with a power output of more than 1 Watt.
Testing À Settings at the SME
- 100 MHz, unmodulated,
- Level -120 dBm.
À Apply the d.c. voltage via the 50-Ohm resistance.
The overvoltage protection must respond at a voltage of >4V and
<7V with both polarities.
À Connect the signal generator to the RF output socket of the SME
via the power amplifier and feed frequencies of up to 1500 MHz (in
the case of SME03E/03 2200/3000 MHz).
The overvoltage protection must respond at a supplied RF power of
0.5 to 1W.
5.2.15 Level Monitoring at Input EXT1
Test equipment Test system 5.1.1.2
Test setup Connect the generator output of the audio analyzer to external
modulation input EXT1.
Testing
À Setting at the SME
- Select EXT1 in the MODULATION/AM/AM SOURCE menu.
Gen. level under 0.98 ±0.01 V(v
p
eak
) .........indication EXT1 LOW
Gen. level over 1.02 ± 0.01 V(v
p
eak
) .........indication EXT1 HIGH
Gen. level between 0.99 and 1.01 V(v
p
eak
)..............no indication