Calibration Check; Switch Settings To Select Measurements - 3M 1200 User Manual

Meter Integrity
3. Turn to calibrator ON. If optional,set the frequency to 1 KHz.
4. Place the black adapter ring fully onto the microphone.
5. Set the model 1200 to SPL, PAUSE, SLOW or FAST, and A or C
weighting. Set the measuring range so that the calibration level falls
within it.
6. If the 1200 has data in the memory, it must be cleared before
calibration is possible. To do this, press and hold the RESET button.
For more details see (RESET Button, section 2.2.6).
7. Press and hold the CAL button until 'CAL' appears in the display.
Release the button. Three dashes will appear and then disappear one
at a time as the meter calibrates. A final message of 'PAS' or 'BAD'
will appear in the display. If 'BAD', review steps one though five.

3.3.1 Calibration Check:

It is a good idea to check calibration after use. To do so, perform the
previous steps 1 through 5. Observe the meter display, it should read the
calibrator level +/-0.5 dB. If out of tolerance, run calibration procedure in
section 3.3.
3.4 Switch Settings to Select Measurement:
To Measure:
SPL
LEQ
MAX HOLD
9
Set Switches to:
SPL, A,C or Z,
RUN or PAUSE,
RESPONSE of
interest
LEQ, A,C or Z,
RUN, RESPONSE of
FAST, SLOW OR
IMPULSE
MAX, A,C or Z,
RUN RESPONSE of
interest
1200/2200 Sound Level Meter Operator's Manual
Display:
1 second update
Holds LEQ until RESET
or Meter SETTING is
changed
Holds MAX until RESET
or Meter SETTING is
changed