Quest Engineering Q300 Instructions Manual Download Page 21 | Manualshive

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Quest Engineering Q300 Instructions Manual Download Page 21

39

Figure 13

. Weighting Characteristics

6.3 Weighting Characteristics

The Q-300 has "A" and "C" weighting characteristics as shown in Figure 13. For most industrial and community noise

measurement requirements, the "A" weighting should be used. The "A" weighting has a response similar to the human ear.

The "C" weighting is used for measuring noise reduction in hearing protectors and other scientific purposes. Peak

measurements are made with the Linear, or Flat frequency weighting.

40

Figure 14

. SLOW Response

Figure 15

. FAST Response

6.4 Tone Burst Response

Figures 14 and 15 show the meter's tone burst response to sinewave inputs of varied burst duration. The available time

constants are:

SLOW RESPONSE

(1000 msec time constant)

Decay Rate:

4.35 dB per second.

FAST RESPONSE

(125 msec time constant)

Decay Rate:

29 dB per second.

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Summary of Contents for Q300

Page 1: ... 2 1 2 Initial Turn On and Check 3 1 3 Calibration 4 Storing the Calibration Value 5 1 4 Battery Installation and Removal 6 2 ABOUT THE METER 7 2 1 The Display 7 2 2 Keypad Functions 8 2 3 Acoustic Event Options 11 2 4 Memory Capacity 12 2 5 RESET Erasing Stored Data 12 2 6 Overload Detection 12 2 7 Security 13 3 SETUP MENU 16 CAL 16 EVENT 16 RANGE 17 UL 17 CL 17 ER 17 TL 17 FAST SLOW 17 A C 17 AO...

Page 2: ...51 QUEST SERVICE AND WARRANTY POLICY 53 2 Figure 1 Q 300 Noise Dosimeter 1 INTRODUCTION TO THE Q 300 The Quest Model Q 300 noise dosimeter performs a wide variety of acoustical measurements Both exponential averaged and time integrated measurements may be made and the results logged in internal memory The output of an unweighted peak detector may also be displayed or logged Applications include in...

Page 3: ...ctor from the dosimeter gently grasp and pull the knurled ring of the cable connector To attach the cable connector to the dosimeter 1 Grasp the black rubber boot of the cable connector 2 Gently press the cable connector against the dosimeter connector while slowly rotating it When it is properly lined up it will stop rotating and slide into the dosimeter s connector 3 Insert the cable connector u...

Page 4: ...erform a calibration enter the following key sequence The CAL annunciator in the display will light and the number in the display should match the output level of the calibrator To change this value refer to section 3 Setup Menu Connect the microphone to the calibrator as directed in steps 2 3 and 4 of the previous section Press RUN to begin the calibration routine The display will read CAL and af...

Page 5: ...p will not be retained when a 9V battery is not in the dosimeter The memory only draws current from this battery when a 9V battery is not in the unit Contact the factory or a Quest service center for replacement 8 Figure 5 Q 300 Display 2 ABOUT THE METER 2 1 The Display The LCD display provides the user with the selected measurement and the measurement parameters A or C weighting FAST or SLOW resp...

Page 6: ...AX MIN or PEAK for display The ª and keys are used to select the specific item Pressing LEVELS again selects the next dosimeter s I II or III levels for display If two or more dosimeters have identical measurement parameters the higher number dosimeter will not be displayed The levels between dosimeters will only differ if the time constant selected for one dosimeter differs from that of the other...

Page 7: ...ata as follows Each time that the unit is Run and Paused creates an Event which is a set of measurements performed over a user defined period of time referred to as the Run Time The event begins at the Start Time and ends at the Stop Time Each event is stored in internal memory with its own data referred to as the Event Summary The Overall Summary is the result of all measurements taken since the ...

Page 8: ...old the ENTER key for five seconds The display will count down from rES5 to rES1 After five seconds the data memory will be cleared the display will briefly show and on will be displayed 2 6 Overload Detection While viewing SPL the overload indicator OL is displayed whenever the incoming signal saturates overloads the circuitry If an OL condition occurs while in the RUN mode the OL indicator will ...

Page 9: ...ff the Q 300 will turn itself on and RUN at the specified time and date The unit will be secured during that RUN period If SE2 is enabled the Setup Menus may be reviewed but not altered except for enabling or disabling SE1 To disable SE2 go to the SE21 display in the Setup Menu and press ENTER 0 will be displayed Enter the four digit code as instructed above After successfully entering the last di...

Page 10: ...he current event press the following key sequence Desired Data Group Desired Measurement Return to Menu 18 To select a different event for review press the following SET indicator on Select event number Return to Menu C changes to r SET turns off Pressing any of the four FUNCTION keys followed by the arrow keys will select the desired measurement for display Press ENTER to return to the menu Event...

Page 11: ...d go to next value After setting the last value the SET indicator will turn off To review the settings repeatedly press ENTER without pressing the arrow keys to advance through the screens 20 Communications Parameters BAUD Baud rate or data rate for RS 232 communications Set to the same rate as the computer or printer being used Choices are 300 through 19200 baud or PRLL for parallel printer opera...

Page 12: ...l setup parameters SE10 Security mode to lock unit operation while in RUN mode The last digit of either display can be a 1 or a 0 1 indicates that security is enabled and 0 indicates that security is disabled To enable or disable security change the 0 to a 1 and enter a four digit code using the arrow and ENTER keys After correctly entering the last digit the display will return to the SE11 or SE2...

Page 13: ...r serial RS 232 printer by using the proper cable and adapter Data may also be printed directly to a PC by using a communications package such as Procomm or Windows Terminal The printout contains the Overall Summary information and individual Events if desired including 1 All measurement parameters Range Weighting etc 2 Data Summary of all measured parameters LEQ LMAX etc 3 Start Stop and Run Time...

Page 14: ... setting within the printer configuration and one setting within the dosimeter configuration The dosimeter can be programmed to one of the following four settings LF Cr Line Feed followed by Carriage Return Cr LF Carriage Return followed by Line Feed LF Line Feed only Cr Carriage Return only To try a few lines of print depress RUN PAUSE twice If the printer does not work properly change the dosime...

Page 15: ...2dB Pa2Hr 0 2 DOSIMETER 3 Peak Level 124 5dB 18 MAR 95 13 32 45 Slow Max Level 114 4dB 18 MAR 95 13 32 45 UL TIME 0 00 08 Slow Min Level 99 8dB 18 MAR 95 13 33 18 LAVG 110 5dB TWA 81 6dB DOSE 4 2 DOSE 12 3076 SEL 3 118 2dB Pa2Hr 0 2 Page 1 28 EVENT SUMMARY EVENT 1 Notes ____________________________________________________________________ ____________________________________________________________...

Page 16: ...lete due to the study ending prior to the last interval printed This will be indicated by In the example printout the data was logged at 1 minute intervals but combined into five minute intervals for the printout Each row contains five five minute intervals and the average for the entire 25 minutes The in the last row indicates that the first value was combined from less than five logging interval...

Page 17: ...e Q 300 must be set for serial operation and the settings baud rate etc must match that of the PC The serial communications cable must be connected between the meter and the PC Pressing the PRINT key will cause the meter to print to the PC 32 Downloading Using WindowsTM TERMINAL Microsoft WindowsTM has a communications program under the ACCESSORIES icon called TERMINAL Instructions on how to use T...

Page 18: ...o print x 0 through 7 Logged Data Statistics Events Prn0 Off Off Off Prn1 On Off Off Prn2 Off On Off Prn3 On On Off Prn4 Off Off On Prn5 On Off On Prn6 Off On On Prn7 On On On 34 PRTx enables or disables the programmed run duration x Y for enabled x N for disabled PRTDxx yy sets the programmed run duration where xx hours yy minutes THxyyy sets the integration threshold x 1 2 or 3 for dosimeter 1 2...

Page 19: ...it is important to use the dosimeter correctly and to understand its limitations It will correctly integrate all sound levels within the range of the instrument A few items related to accuracy are as follows There is a tendency to overestimate the accuracy of digital readings The values such as Leq are computed to a precision of 0 1 dB However the absolute accuracy of the reading is not 0 1 dB but...

Page 20: ... power state of the art circuitry The dosimeter is very stable and reliable over a wide range of environmental conditions The low power circuitry gives the dosimeter a long battery life When the 9 volt battery is changed all dosimeter information is retained due to an internal lithium battery The lithium battery lasts for many years before needing replacement See SPECIFICATIONS A rubber Key Pad is...

Page 21: ...ing is used for measuring noise reduction in hearing protectors and other scientific purposes Peak measurements are made with the Linear or Flat frequency weighting 40 Figure 14 SLOW Response Figure 15 FAST Response 6 4 Tone Burst Response Figures 14 and 15 show the meter s tone burst response to sinewave inputs of varied burst duration The available time constants are SLOW RESPONSE 1000 msec time...

Page 22: ...ility with 1dB error at field strengths to 10 V m over the frequency range of 10 MHz to 500 MHz Size 5 5 x 2 8 x 1 4 inches 140 x 70 x 40 mm Weight 15 5 oz 440 grams Construction Cast aluminum housing with security cover Note Specifications subject to change 42 8 ACCESSORIES 56 963 8mm Shoulder Mount Dosimeter Microphone Type 2 One piece system including Cable Connector and Microphone 58 852 Earlo...

Page 23: ... clip with the microphone boom thumbscrew The exposed end of the microphone boom thumbscrew is threaded so that a tripod can be connected to it 44 8 2 AC DC Adapter Installation Quest part number 056 973 The dosimeter can operate from one of the following power sources if desired Any AC power source 9 to 18 VAC 35 mA minimum Such as the Quest Model 920 AC Power Supply Any DC power source 12 to 24 ...

Page 24: ...rker can be exposed to per day This as a computation that is based on the following variables Criterion Level CL Lower Threshold LT and Exchange Rate ER EOL End of Line Character These are printer instructions that can be placed at the end of each line of type in the printout The dosimeter can be programmed to send Line Feed LF and Carriage Return CR instructions ER Exchange Rate The number of dec...

Page 25: ...source but will produce an averaged reading SPL Sound Pressure Level A quantity in decibels equal to the sound pressure divided by 20 uPa 0 00002 N m2 times 20 The word Level indicates that the sound pressure is a certain level above the reference level The SPL is displayed each second as the 48 maximum value Slow or Fast Response for the previous 1 second period STATISTICS Time Statistical Distri...

Page 26: ...ctable 3 4 5 or 6 dB CL Criterion Level in dB Selectable 40 to 140 dB LHIST Integrated Level stored either in 1 second 10 second or 1 minute periods based on the programmed Logging setup HTIME Time in seconds used to compute Time History Selectable 1 second 10 seconds or 1 minute SC Sample Counts The number of samples occurring at the same dB level TS Total Samples The total number of samples duri...

Page 27: ...should find it necessary to contact the factory regarding service or shipping damage please direct your calls or letters to the attention of the Service Manager Quest Technologies 262 567 9157 or 800 245 0779 Office hours are from 8 AM to 5 PM Central Standard Time Monday through Friday Warranty Quest Technologies warrants our instruments to be free from defects in materials and workmanship for on...

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