Manuale d’uso / di manutenzione del prodotto M-27 del fabbricante AudioQuest
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TABLE OF CONTENTS INTRODUCTION………………………………………… …………………………………………….3 M-27 SIMPLIFIED OPERATING INSTRUCTIONS…………………………….…………… ……..5 Control Keys……………………………………… ………………………………….
FCC COMPLIANCE AND CAUTIONARY NOTE: User is cautioned that chang es or modifications not expressly appr oved by the party responsible fo r compliance could void the user's authority to operate the equipment.
Events Monitor: Accumulates the following data for up to 16 separate events: 3 separate integrated sound levels. 3 separate noise doses. 2 time weight ed average s and a sound expo sure leve l. Peak level, maximum level, start time, and run time. The M-27 as an overall unit accumulates data for: 3 separate dosimet ers.
In steps 1 to 3 only data for the HTL ( High Threshold Level ), LTL (Low Thres hold Level), or 3 dB (No Thresh-old) will he displa yed or pr inted. In step 4 data for HTL, LTL, and 3 dB will be printed. Step 5 dumps raw data to the Computer. Step 6 reads or resets the Clock.
L-AVG The average or equivalent l evel for the HTL, LTL, or LEQ 3 dB for the event. DOSE The percent Dose f or the HTL, LTL, or 3 dB for the event. TWA The Time Weighted Average for HTL or LTL or the SEL Sound Exposure Level for the event. PEAK The Peak Level for the event.
Dumping Raw Data The data stored in the unit may be transferred to a computer or printer for reprocessing. Thi s data is useful only with additional comput er programs. Consult Quest for programs. CODE Press key until CPU is displayed. HL3 PRINT Prints raw data to computer.
Battery Indicator: 8-hour battery life, 1 week data retention Calibrator: External calibrat or Temperature: -15° to 50°C operating; -40° to 60°C storage (battery removed).
It also has a 1 second Slow and a.125 second Fast time cons tant circuit. Present OSHA requirements specify Slow. Microcomputer Modes The M-27 is contr olled by a MC1468 05 CMOS Microc omputer.
Where: LS = Sound level in dB with slow time constant if the sound level is greater than the threshold level and is - ∞ if the level is less than the threshold level. L3 = Sound level in dB without slow time constant. TC = Criterion time in seconds or 28800 seconds.
NOTE When the unit is off, the battery still powers the memory. If the unit is not going to be used for a few day s, the battery shoul d be removed. Microphone Replacement The microphone is field replaceable. To unscrew th e microphone, grip the knurled nut on the top of the dosimeter and gently turn it counterclockwise.
6. Attach the microphone to the collar or shoulder of the op erator (see Effects of Operator Presence and Figure 6). 7. Press the RUN key and hold until you see the unit cou nt. 8. Install the security cover and attach the unit to the operato r's belt or pocket.
6. Move to the ne xt area and repeat steps 4 a nd 5. 7. When finis hed with surve y or when 16 events are accumulated, press ON/OFF to exi t EVENTS. At any time, even when accumulating data, th e cu rrent or any pre vious event data m ay be displayed.
Parallel Printers Check printer manual to set up printer. If switches are changed it may be necessary to reset the printer. Check interconnecting cable to as sure it is the proper cable. Set the internal switches in the M-27 to agree with the printer.
NOTE If the level is less than the threshold for part of the minute the average can be less than the threshold. If no levels above the threshold level are measured, the level is set to 00 dB. The first + in the gra ph is 50 dB and the next is 60 dB , etc.
. .61 is the percent dose accumulated at 80 dB. 1.23 is the perc ent at 81 dB, etc. The percent dose statistical distribution is accumulated without a threshold . Of course, the dose calculations in the summary exclude any dose accumulated below the threshold.
and prints only that data. As an example, if HIST 5 has been p ressed, pressing PRINT will print out a heading, a summary, a 5-mi nute histog ram, and a statistical distribution. If HTL is annunciated, pressing HIST 10 will print a 10-minute histogram for the high threshold level only.
Printer Setup Serial Printer Output The serial printer output is RS-232-C compatible. It sends data in ASCII cod e at 300, 600, 1200, or 2400 Baud. The data is sent asynchronously. The Data Set Ready line is checked before sendi ng a character. Each character consists of 11 bits made up of a sta rt bit, 8 ASCII character bits, and 2 st op bits.
he M-27 may draw addi tional curr ent when connected to a printer. For best results connect the M- 27 to a printer on ly when printing data. INTERNAL SWITCHES The M-27 is set at the factory to the c urrent OSHA re quirements unle ss otherwise specifi ed.
Switch Positions Switch 1 and 2 sel ect the M-27 functio ns. Switch 1 and 2 are read only on RESE T and when the battery is replaced. Switch 3 selects printer options. Switch 3 is read at the start of each printout and may be changed without destroying data .
Position 3 On = Print Graphs Off == No Graphs Position 4 On = Print Text Off = No Text If 3 and 4 are both off, Graphs will print. Positions 5 6 2nd and Last print character in HEX On On = 0A 0D L F C.
To set the criterion level to 80 dB and the exchange rate to 3 dB, set the next 4 positions down. For a high threshold of 80 and a low threshold of 70 set the first 4 positions of the right switch to down, up, up, and up. To identify this unit as unit 0 set the next three switches down.
For the 3-digit code: 1. Press CODE/HL3 until 3 or less digits code are displayed. (Leading zeros are not displayed.) 2. Enter code i n table. 3. Convert Hex t o binary (see Tabl e 1). 4. Look up each position in inter nal switch section. 3 decodes to unit 3.
between TWA and Dose is that TWA is expressed in decibels and Dose is expressed as a perce nt. TWA is equal to a c ontinuous level w hich if constant f or eight hours would produce the same noise dose as the do se accumulated over t he run time . The average integrated sound level (La vg) will be equal to TWA at eight hours.
it is turned on, is reset, or the PAUSE key is pr essed. Wait until the sound lev el has stabilized before entering the run m ode. Always remember to press RUN. Press PAUSE before pressing PRINT. If in the ru n mode, the data printed at the beginning of the printout will not agree with the data at the end.
Service Policy The Quest product you have purchased is one of the finest ac oustic instruments available. It is backed by our full one ye ar warranty which seeks complete customer satisfaction. This is your assu rance that you can expect prompt courteous service for your equipment from the entire Quest service organization.
Un punto importante, dopo l’acquisto del dispositivo (o anche prima di acquisto) è quello di leggere il manuale. Dobbiamo farlo per diversi motivi semplici:
Se non hai ancora comprato il AudioQuest M-27 è un buon momento per familiarizzare con i dati di base del prodotto. Prime consultare le pagine iniziali del manuale d’uso, che si trova al di sopra. Dovresti trovare lì i dati tecnici più importanti del AudioQuest M-27 - in questo modo è possibile verificare se l’apparecchio soddisfa le tue esigenze. Esplorando le pagine segenti del manuali d’uso AudioQuest M-27 imparerai tutte le caratteristiche del prodotto e le informazioni sul suo funzionamento. Le informazioni sul AudioQuest M-27 ti aiuteranno sicuramente a prendere una decisione relativa all’acquisto.
In una situazione in cui hai già il AudioQuest M-27, ma non hai ancora letto il manuale d’uso, dovresti farlo per le ragioni sopra descritte. Saprai quindi se hai correttamente usato le funzioni disponibili, e se hai commesso errori che possono ridurre la durata di vita del AudioQuest M-27.
Tuttavia, uno dei ruoli più importanti per l’utente svolti dal manuale d’uso è quello di aiutare a risolvere i problemi con il AudioQuest M-27. Quasi sempre, ci troverai Troubleshooting, cioè i guasti più frequenti e malfunzionamenti del dispositivo AudioQuest M-27 insieme con le istruzioni su come risolverli. Anche se non si riesci a risolvere il problema, il manuale d’uso ti mostrerà il percorso di ulteriori procedimenti – il contatto con il centro servizio clienti o il servizio più vicino.
