45
9.0 TROUBLESHOOTING
Blank display when the
ON/OFF
key is pressed:
Replace the battery with a known fresh battery.
Unit does not calibrate:
Check for LOBAT indicator. Battery must check OK.
Check the Calibrator; Listen for a tone from its output.
Reset the dosimeter and try again.
Try a different microphone if you have another dosimeter. If this works, the microphone needs replacing.
Return for service.
Unit is erratic:
Try a different microphone if you have another unit. (The microphone or preamp could be intermittant.)
Return for service.
46
APPENDIX
Definitions
All definitions are in reference to the Q-300 dosimeter.
BAUD
:
Baud Rate
The rate of data transfer, in bits per second, between the dosimeter and a printer or computer in the serial output mode.
CL
:
Criterion Level
The constant sound level in dB that, if applied for 8 hours, would accumulate a DOSE of 100%. (Used in Dose
measurements.)
DOSE
:
Dose
A percentage of the maximum allowable noise that a worker 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 decibels that a sound must change to either halve or double the rate of dose accumulation.
(3, 4, 5, or 6 dB exchange rates are common.)
EVENT
: Each measurement time that the dosimeter is in the Run mode.
EXP
:
Exposure
A method of measuring dosage, in Pascal Squared Hours. Pa
2
H is a linear unit rather than a percentage.
1 Pascal is equal to 94 dB. 94 dB for 1 Hour equals 1 Pa
2
H.
Examples of the 94 dB/time relationship:
94 dB for 1 Hour = 1.00 Pa
2
H
94 dB for 8 Hours = 8.00 Pa
2
H
The accumulation of Pa
2
H will double (or halve) for every 3 dB of change from 94 dB as follows:
97 dB for 1 Hour = 2.00 Pa
2
H
94 dB for 1 Hour = 1.00 Pa
2
H
91 dB for 1 Hour = .50 Pa
2
H
88 dB for 1 Hours = .25 Pa
2
H
85 dB for 1 Hours = .125 Pa
2
H
1 Pa
2
H is typically the maximum allowable Exposure.