Installation guide

Troubleshooting
Block Descriptions for Option UNJ and Option 506
1-141
The RPP circuitry prevents instrument damage when power is mistakenly applied to the instrument’s RF
output. The RPP circuitry opens an RF relay when 1 Watt of energy is sensed on the RF output. Repeated
high levels of reverse power degrade the performance of the RPP or completely bypass the open RF relay. The
RPP may be reset through the front panel softkeys.
There is no RPP module available for Option 506, which covers the frequency range of 4 GHz to 6 GHz.
Instead, an A29 DC Blocking Capacitor (Option 506) is used to block dc from damaging the AT1 High-Power
Mechanical Attenuator (Option UNB).