Operating Instructions - York Survey Supply Centre
Contents
1. Survey Supply ITN Autoranging Sound Meter Nothing else measures up Prospect House George Cayley Drive Clifton Moor York England YO30 4XE Code 343000 Tel 44 0 1904 692723 Fax 44 0 1904 690385 E Mail sales yorksurvey co uk Operating YorkSurvey o MyorkSurvey s Instructions Ref operat98 instructions 15 343000 qxp 05 01 15 York Survey Supply Centre 2015 Autoranging Sound Meter Operating Instructions Introduction Your digital sound level meter provides automatic or manual ranging 4 measurement ranges from 40 to 130dB and features 0 1dB resolution The meter allows you to select between fast and slow response times and A and C weighting A maximum hold function is provided Jacks on the meter provide AC analogue output Button Description ON OFF Power on or power off the meter REC MAX HOLD MIN RANGE Auto range Manual range select key AUTO FAST RECORD Record maximum and minimum sound level measurement MAND SLOW WEIGHTING A C A weighting and C weighting select key FAST SLOW Response select key MAX HOLD Freeze maximum sound level reading ree eneeepenpseepi Diagram A Measuring Sound Levels Sound levels are displayed both digitally and in a bar graph The digital display is updated every 160ms while the bar graph is updated every 40ms 1 Press the ON OFF key to turn the meter on The unit will first display the full screen and 18 18 8 then count down from 992. 9 to zero The meter will now begin measuring the current sound levels SPL Sound Pressure Levels appears on the left side A dB on the right side of the screen Point the microphone toward the source of the sound to be measured Diagram B Selecting the Response Time You can select how fast or slow response time to suit different applications and standards For example most OSHA related testing is done using slow response time and A weighting When you turn the meter on it will be in fast response mode Press the FAST SLOW key to toggle between fast and slow response Asmall FAST or SLOW will be displayed on the right side AUTO T 3 8 AUTO 3 z of the screen to indicate the current mode Tagine Cc aan D Selecting A and C Weighting When you turn the meter on it will be in A weighting mode A weighting enables the meter to respond in the same manner as the human ear which increases and decreases amplitude over the frequency spectrum Applications for A weighting include OSHA regulatory testing environmental measurement workplace design and law enforcement C weighting is suitable for flat response measurements with no increase or decrease of amplitude over the frequency spectrum Applications for C weighting include the sound level analysis of engines and machinery Press the WEIGHTING AIC key to select between A and C weighting A small A or C will be displayed on the right side of the screen to indicate the
3. indicator disappears to exit recording mode Selecting Automatic and Manual Ranging The meter features 4 measurement ranges in 10dB steps 40 70dB 60 90dB 80 110dB 100 130dB When you turn the meter on it will be in automatic range mode and a small AUTO will be displayed on the left side of the screen In this mode the meter will adjust the measurement range automatically for accuracy The two digit number to the left of the bar graph on the LCD will show the low end of the current range You can also set the range manually The meter will be able to take readings more quickly because AUTO rast the unit does not need to first establish the range before stow MANU displaying the measurement To adjust the range manually 1 When measuring sound levels press the RANGE keys as povapeensesspenn sey pone needed to adjust the measurement range MANU will appear on agai oy the display Note that the two digit number to the left of the bar graph will change to reflect the low of the newly selected range 2 Press RANGE key to switch back to automatic ranging If the meter is operating in manual range and LO is displayed the sound is too low for the range If HI is displayed the sound is too loud In either case you must adjust the measurement range or your readings will be inac curate Automatic Shut Off The meter will automatically turn off after 20 minutes to preserve the battery To override this feature 1 Make s
4. current mode Diagram E Freezing the Maximum Sound Level Reading MAX HOLD 1 Press the ON OFF key to turn the meter on AUTO FAST 2 When measuring sound levels press the MAX HOLD key to freeze the maximum reading MAX HOLD will be displayed The digital display will remain unchanged until a higher reading is detected Note that the bar graph will continue to record the current reading 3 Press the MAX HOLD key again to exit maximum hold mode Sagi F F Recording the Maximum and Minimum Measurements 1 Press the ON OFF key to turn the meter on 2 Press the RECORD key RECORD REC will be displayed on the top corner of the screen The meter will begin tracking the maximum and minimum sound level measurements 3 Press the RECORD key again MIN will appear on the middle up of the screen and the minimum sound level measurement will be displayed The unit is not recording at this time but the bar graph will continue to show the current reading Ref operat98 instructions 15 343000 qxp 05 01 15 4 Press the RECORD key again MAX REC MAX ae FAST AMO Fast will appear on screen side by the REC PAST and the maximum sound level A measurement will be displayed The unit is not recording at this time but the bar graph will continue to show the current Sagan G agian H reading Fagin l 5 Press the RECORD key again to resume recording and repeat the process 6 Press and hold the RECORD key until the RECORD
5. epair or replace any defective unit without charge This warranty does not cover probes bat teries or damage resulting from accident misuse or abuse of the product York Survey Supply Centre 2015
6. ure the unit is turned off CEE ay 2 Press the ON OFF and MAX HOLD keys simultaneously 3 When the full display appears release the MAX HOLD key first will replace full display 4 Release the ON OFF key The meter will remain on until the ON OFF key is pressed again The automatic shut off feature will resume the next time the meter is switched on Calibration Using a standard Acoustic Calibrator Recommended B amp K type 4231 model which generates 94dB output 1 Set whichever time weighting fast or slow 2 Set sound level range at 80 110dB 3 Select weighting A or C 4 Max Hold function measurement mode unenabled 5 Better to calibrate under 60dB sound environment Diagram N Insert the microphone into the hole of the calibrator Press calibrator ON OFF key to power on and adjust the CAL potentiometer of the unit the level display will indicate the desired level While selecting C weighting display 0 3dB deviation is reasonable AUTO FAST J04 Replacing the Battery When the screen display BAT down at the left corner the 9V battery has fallen to a critically low voltage level and should be replaced as soon as possible Use a screwdriver to unscrew the back battery compartment cover Insert a fresh 9V battery and screw the cover peg agams oO WARRANTY We warrant this product against defects in materials and workmanship for a period of one year from the date of purchase and agree to r
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