Instruction manual

111
Technical Notes
When the output of the microphone/preamplifier is routed through an extension cable,
certain limitations regarding measurable sound pressure level and frequency range will
apply. This is due to the influence of the cable capacitance. The longer the cable, the lower
the measurable sound pressure level and the lower the frequency limit. The diagram below
shows the relationship between cable length, measurable sound pressure level, and fre-
quency.
If for example a sound pressure level of 120 dB is to be measured up to 3 kHz, an exten-
sion cable length of up to 100 meters can be used.