he 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. As an example, if the display is a 4-digit display such as 10EE, then the unit is set to a criterion level of 90 dB for 8 hours, an exchange rate of 5 dB, a high threshold level of 90 dB, a low threshold level of 80 dB, 115 dB upper limit level, "A" frequency weighting, the 50 dB to 146 dB range, a SLOW time constant and a 12- hour clock.
If the display is a 3-digit code then the first number is the unit identification number. The next two |
digits are the printer setup. The printer setup may be changed at any time without erasing data. The other |
switches are only read when the unit is reset. | |
Some examples of common switch settings and codes are as follows: |
OSHA Compliance and Hearing Conservation | |
"A" Weighting | 90 dB High | Parallel Printer |
50-146 dB Range | Threshold | Text and Graph |
115 dB Upper Limit | 80 dB Low Threshold | LF and CR |
Slow Time Constant | 12 Hour Clock | 600 Baud |
90 dB Criterion | Unit Unit #1 | |
5 dB Exchange Rate | | |
