Quest Technologies 2200 Operator's Manual
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5.3 Microphone Preamplifier Extension CablesOn 1200R (Remote) units the preamplifier is removable by unscrewing theblack plastic collar below the preamplifier housing. The 1200 will drive upto a 10 foot cable with minimal loss. Quest offers the following lengths ofremote cable for use with the 1200:#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 theinsertion of either of these cables. Therefore, there is no need to recalibratewhen the cable is attached.5.4 Input Buffer CircuitryThe high impedance input circuitry of the 1200 will accept up to a 2.0 voltRMS signal. With the microphone and preamp removed, other transducerdevices may be connected to give a dB readout on the meter. To removethe preamplifier unscrew the black plastic collar below the preamphousing. Only use pins 1 and 3 for the AC signal input. NEVER connect topins 2 and 4. To input an electrical signal requires a special connector,Quest part number 14-739. Figure 9 shows the function of each of the pinswithin the meter input connector.5.5 Weighting CharacteristicsThe weighting characteristics (frequency response) for A, C, and Z areshown in Figure 10. The "A" weighting response emulates the response ofthe human ear and is used for most industrial and community noise mea-surements. Generally, "C" weighting is used for measuring noise reductionin hearing protectors and for other scientific purposes. "Z" is a linearresponse from 5 Hz to 20 kHz.5.6 Tone Burst ResponseFigures 11,12 and 13 show how the meter responds to a sine wave input ofvaried pulse duration for each response setting. |
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