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TABLE OF CONTENTS
INTRODUCTION....................................................................................................3
M-27 SIMPLIFIED OPERATING INSTRUCTIONS.........................................................5
Control Keys..............................................................................................5
Sound Level Meter Keys..............................................................................6
Dosimeter Keys..........................................................................................6
Time Keys..................................................................................................7
Event Keys................................................................................................7
Procedure to Accumulate Event Data............................................................7
Setting the Clock........................................................................................8
Recording the Calibration Level...................................................................8
Using a Printer...........................................................................................9
Dumping Raw Data....................................................................................11
Changing Printer Parameters......................................................................11
SPECIFICATIONS.................................................................................................11
GENERAL DESCRIPTION......................................................................................12
PRINCIPLES OF OPERATION.................................................................................13
General....................................................................................................13
Weighting Characteristics...........................................................................13
Microcomputer Modes................................................................................14
Formulas and Definitions............................................................................16
TESTING AND CALIBRATION.................................................................................17
Battery Test...............................................................................................17
Battery Replacement...................................................................................17
Microphone Replacement............................................................................18
Calibration and Maintenance........................................................................18
Daily Calibration.........................................................................................18
Altitude Corrections....................................................................................19
OPERATING PROCEDURE......................................................................................19
As a Personal Noise Dosimeter....................................................................19
As an Area Monitor.....................................................................................20
As a Survey or Event Monitor......................................................................21
Effects of Operator's Presence....................................................................22
Use with Windscreen..................................................................................22
Using a Printer...........................................................................................23
Connections to Printer................................................................................24
Sample Printouts........................................................................................24
Memory Map...............................................................................................30
Editing Printout..........................................................................................31
Printer Setup..............................................................................................32
EXTENDING BATTERY LIFE....................................................................................33
INTERNAL SWITCHES............................................................................................34
Switch Positions........................................................................................36
Setting Internal Switches............................................................................38
Code Decoding..........................................................................................41
TROUBLESHOOTING............................................................................................42
INTERPRETING RESULTS.....................................................................................43
Use of Lavg and TWA................................................................................43
Estimating TWA from Lavg........................................................................44
Accuracy of Readings...............................................................................44
Hints and Good Practices..........................................................................44
Considerations of Measurement and Accuracy............................................46
ACCESSORIES....................................................................................................47
QUEST SERVICE AND WARRANTY POLICY............................................................48
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Summary of Contents for Quest Technologies M-27
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Page 1: Table Of Contents
TABLE OF CONTENTS INTRODUCTION……………………………………………………………………………………….3 M-27 SIMPLIFIED OPERATING INSTRUCTIONS…………………………….…………………..5 Control Keys…………………………………………………………………………..……..5 Sound Level Meter Keys……………………………………………….…………………..6 Dosimeter Keys………………………………………………………………………….…..6 Time Keys……………………………………………………………………………………..7 Event Keys……………………………………………………………………………………7 Procedure to Accumulate Event Data…………………………..……………………….7 Setting the Clock……………………………………………………………..……………..8 Recording the Calibration Level………………………………………………….………8 Using a Printer……………………………………………………………………………….9 Dumping Raw Data……………………………………………..…………….……………11 Changing Printer Parameters……………………………………….……….…………..11 SPECIFICATIONS………………………………………………………………………….…………11... -
Page 2: Introduction
15 of the FCC Rules. These limits are designed to provide reasonable protection against M-27 functions as a personal noise dosimeter, an area monitor or as a survey events monitor (see Figure 1). harmful interference in a residential installation. This equipment generates, uses and can radiate radio... -
Page 3: M-27 Simplified Operating Instructions
PAUSE/RESET for 5 seconds or to remove the battery. CODE Cycles through 7 steps. Press the key for each step. Allows the M-27 to display and print data 7 ways. Also displays a code of internal switch settings. -
Page 4: Sound Level Meter Keys
Time Keys The total time the unit was running and accumulating TIME data. If the total time is less than 30 minutes, the co- lon will blink if the key is held down and the time shown is in minutes and seconds. If the colon stays on, the time shown is in hours and minutes. -
Page 5: Setting The Clock
L-AVG The average or equivalent level for the HTL, LTL, or 3 dB for the event. the CAL screw. If the unit is more than a few decibels out of calibration, it should be rechecked. DOSE The percent Dose for the HTL, LTL, or 3 dB for the event. -
Page 6: Dumping Raw Data
Dumping Raw Data The data stored in the unit may be transferred to a computer or printer for reprocessing. This data is useful only with additional computer programs. Consult Quest for programs. CODE Press key until CPU is displayed. PRINT Prints raw data to computer. -
Page 7: General Description
0 to 95% non-condensing The electronics utilizes low power circuitry for long battery life, maximum stability, and high reliability over a wide range of environmental conditions. A block diagram of the M-27 is shown in Figure Magnetic Field Effects: Negligible below 50 Oersteds at 50 to 60 Hz Size: 5 ½... -
Page 8: Microcomputer Modes
Reset Mode The M-27 enters the reset mode when the unit is reset or a battery is installed. In this mode power is applied to the unit, all previous data is cleared, the internal switches are read, the counter is cleared, the pause register is set, three dashes are placed on the display, and the unit enters the wait mode. -
Page 9: Testing And Calibration
If it displays 3 dashes replace the back cover. If not check the connections on the battery. The M-27 is now operating in the pause mode. Disconnecting the battery automatically erases stored data in memory. To save data during battery change, use the BX-9 Battery... -
Page 10: Microphone Replacement
N.I.S.T. from P-5 to P-0 and - --. The M-27 should be checked each day before it is used. It is recommended that one of the Quest 3. If LOBAT is displayed, replace the battery and continue. calibrators be used, with the proper 8 mm microphone adaptor. -
Page 11: As An Area Monitor
6. Attach the microphone to the collar or shoulder of the operator (see Effects of Operator 3. Mount the unit on a tripod (see Figure 8). Presence and Figure 6). 4. Aim the microphone up at a 70 degree angle to the noise source (see Figure 5). 7. -
Page 12: Effects Of Operator's Presence
Effects of Operator's Presence connector. Set the internal switches in the M-27 to agree with the printer. It is not necessary to reset the M-27 Any object or surface can act as a reflector or absorber of sound. An operator or person wearing when printer switches are changed. -
Page 13: Connections To Printer
Summary Check printer manual to set up printer. If switches are changed it may be necessary to reset the The summary data includes parameter data of how the M-27 is set up and a summary of all the M- printer. - Page 14 Each - is 2 dB. 105 dB is the average of the 5 levels combined with a 5 dB exchange rate. Each line on a 1-minute histogram is 5 minutes of data. If a 3-, 5-, or 10-minute histogram is selected each line would be 15, 30, or 60 minutes long with 5 or 6 levels per line.
- Page 15 3 dB only system with three different histograms, one with no threshold and two with thresholds. It will also print four statistical distributions, two with a Time constant and two without. If the M-27 is used for community or 3 dB industrial monitoring, the printout will contain much more information than would a data logger with a single printout.
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Page 16: Memory Map
If the printer continues to print after pressing PAUSE or ON/OFF, the printer has received an 0010-003F Setup, dose, and time amount of data from the M-27 and stored it in a buffer. In most printers, the buffer can be turned off if 0040-007F Stack desired. -
Page 17: Printer Setup
The M-27 can send its data to personal computers over the RS-232 port. In general, the computer and M-27 are set up similar to a serial printer. The computer is programmed to be a data terminal and the Each line is terminated by a line feed and/or carriage return characters. -
Page 18: Internal Switches
M-27 may draw additional current when connected to a printer. For best results connect the M- 27 to a printer only when printing data. INTERNAL SWITCHES The M-27 is set at the factory to the current OSHA requirements unless otherwise specified. When the CODE key is pressed, the display shows a coded display of the current internal switch settings. -
Page 19: Switch Positions
Position Unit Switch Positions Switch 1 and 2 select the M-27 functions. Switch 1 and 2 are read only on RESET and when the battery is replaced. Switch 3 selects printer options. SWITCH 3 Switch 3 is read at the start of each printout and may be changed without destroying data. -
Page 20: Setting Internal Switches
The first E means the criterion is 90 dB and the exchange rate is 5 dB. The M-27 has over 15 million unique setup options. The setup is determined by the position of the three 8-position switches located inside the battery compartment. Externally the setting of these switches... -
Page 21: Code Decoding
The last E decodes to a 90 and 80 dB thresholds. The M-27 reads the switches 1 and 2 only when the unit is reset or a battery is reconnected. If the switch positions are changed when the unit is operating, the change will be ignored. Switch 3 is read at the start of a printout. -
Page 22: Troubleshooting
INTERPRETING RESULTS 4. Look up each position in internal switch section. When the M-27 is set up for OSHA compliance and for most other settings, the following are, in general, true. The HTL Lavg is less than the LTL and Lavg is less than Leq. The HTL Dose and TWA are less than the LTL Dose and TWA. -
Page 23: Estimating Twa From Lavg
Lavg if time is greater than eight hours. The M-27 automatically computes the TWA of a worker if the unit is worn by the worker for a full workday. Even if the worker does not work exactly eight hours the TWA measurement will read the correct TWA for that worker. -
Page 24: Considerations Of Measurement And Accuracy
Crest factor is an almost meaningless term for instruments with crest factors in excess of 30 dB. The M-27 is capable of measuring pulses as short as 1 millisecond with a peak amplitude of 143 dB and a background level of 80 dB. This is a pulse range of 63 dB. The crest factor would depend on how often this... - Page 25 If you are unable to return instruments in that time call for a new RA number. Send it prepaid and properly packed in the original shipping carton directly to Quest Technologies, 1060 Corporate Center Drive, Oconomowoc, WI 53066 U.S.A.
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