NARDA PMM ER9000, User Manual

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Operating Instructions 3-13
Using 0 dB attenuation PMM ER9000 has no input protection.
This is a potentially dangerous condition for the input stage of the
receiver.
Use 0 dB attenuation only if you are very sure that your input signal is
less than 1 V (or 120 dB
µ
V).
Before to apply an unknown signal to PMM ER9000 receiver, use an
oscilloscope or a wide band RF voltmeter to measure it. In any case set
Min. ATT at 10 dB and select the maximum available attenuation with
preamplifier OFF.
If needed, add an external coaxial attenuator on the input signal line.
In case an OVERLOAD indication occurs, please check a sufficient input
attenuation is set. In case of very high signals, it is possible to add an
external attenuator to carry on the measurement without overpassing the
declared limit for continuous power or spectral density.