Quest Engineering 1800 Instructions Manual
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331. Read the calibrator 1 kHz output level. Set the meter dB RANGEswitch so that the calibrator level will indicate within the upper20 dB of the meter display. Set the RESPONSE switch to FAST,WEIGHTING switch to LIN and MODE switch to SPL. Turn the POWERswitch to ON.2. Set the OB-100 POWER switch to MANUAL and press the RUN button toplace the meter into the RUN mode. Then use the two directionbuttons to select the 1 kHz filter.3. Place the calibrator (and adapter if needed) onto the microphone.Turn the calibrator ON. A meter reading that is very close to thelevel listed on the calibrator should result. An error of +/- 0.5dB is acceptable. This is due to the center frequency filtertolerance of +/- 0.5 dB maximum.4. Change the OB-100 filter frequency first to 500 and read thedisplay. Then change to 2k and read the display. At bothfrequencies the readings should be 19 to 23 dB less than the 1 kHzcalibrator level.5. Change the OB-100 filter frequency to 1k and the meter dB RANGE sothat the meter reads 20 to 40 dB less than full scale. Press andhold the -20 dB button on the OB-100. The meter reading shall riseapproximately 20 dB to verify that the -20 dB button functions.6. Remove the calibrator. The analyzer is now ready to use.B. Taking a Measurement1. Turn the meter POWER switch ON. The meter will come on in thePause mode. Perform a BATTERY test to verify that the analyzer hassufficient battery power. Replace the batteries if the barindicator falls below the indicating arrow (located at 5 on the 0- 60 scale).2. Set the dB RANGE switch to 80 - 140 dB. Set the RESPONSE switch toFAST, WEIGHTING switch to LIN (see note below), and the MODE switchto SPL.NOTE: Note that the filter response can be in series with either A,B, C, or LIN. This is the operator's choice. However, LIN isgenerally used when taking octave band measurements.3. Turn the OB-100 POWER switch to MANUAL to activate the filter. "---" will appear in the display with the meter in the Pause mode.344. Select the desired WEIGHTING and RESPONSE. Then change the dBRANGE switch down in 20 dB steps until the OL indicator flashes orstays on. Then go back up 20 dB so that the OL indicator staysoff. This ensures that the AC input to the filter is at itsmaximum voltage without clipping (overloading).MANUAL Filter OperationPlace the meter into the Pause mode using the RUN/Pause button. PressRESET to clear all internal memory. Select the first frequency ofinterest. Then enter the RUN mode for the required amount of timenecessary to obtain a valid sample. Then enter the Pause mode, changeto the next frequency of interest and enter RUN again, etc. Repeat thisprocess for all frequencies of interest.AUTO Filter OperationPlace the meter into the Pause mode using the RUN/Pause button. PressRESET to clear all internal memory. Select the first frequency ofinterest. (Be sure that the TIME adjustment is set to the desiredfilter cycle time.)Slide the filter POWER switch to AUTO. To start the sampling sequence,place the meter into the RUN mode and immediately press the properdirection button. (The UP ARROW button causes the frequency to cycle tothe next higher frequency, the DOWN ARROW button causes the frequency tocycle to the next lower frequency.)When the last frequency of interest has completed its cycle time, slidethe filter POWER switch to MANUAL and immediately place the meter intothe Pause mode.NOTE: If it is necessary to record all 10 frequency bands, exit theAUTO mode while in the last frequency band. Use the MANUALFilter Operation to obtain the last frequency. Otherwise, thefirst frequency will be written over. |
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