Microphone preamplifier extension cables
On 1100R (Remote) units the preamplifier is removable by unscrewing the black
plastic collar below the preamplifier housing. The 1100 will drive up to a 10 foot
cable with minimal loss. Quest offers the following lengths of remote cable for use
with the 1100:
• #59-899 ICM-2 Microphone Cable (2 foot length)
• #59-733 ICM-10 Microphone Cable (10 foot length)
• #59-734 ICM-50 Microphone Cable (50 foot length)
The calibration level at 1 kHz is affected by less than 0.1 dB with the insertion of
either of these cables. Therefore, there is no need to recalibrate when the cable is
attached.
Figure 9: Frequency/Amplitude limitations with extension cables
Input Buffer Circuitry
The high impedance input circuitry of the 1100 will accept up to a 2.0 volt RMS
signal. With the microphone and preamp removed, other transducer devices may
be connected to give a dB readout on the meter. To remove the preamplifier
unscrew the black plastic collar below the preamp housing. Only use pins 1 and
3 for the AC signal input. NEVER connect to pins 2 and 4. To input an electrical
signal requires a special connector, Quest part number 14-739. Figure 10 shows
the function of each of the pins within the meter input connector.
Figure 10: Input buffer circuitry
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