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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