CR:270 Series User Manual
Page 9
If Leq display mode is selected the Leq measurement is reset.
If PEAK(C) display mode is selected the peak level is reset.
If SPL display mode is selected the Max Hold is reset.
Reset All
This button, when pressed, simultaneously resets the Leq measurement, the PEAK(C) &
the SPL MAX HOLD reading.
As this button returns the Leq and Peak circuitry to zero it starts a new reading and
destroys the data currently in the instrument. It should be used with caution because
several hours work can be destroyed by pressing 'RESET ALL' accidently. In the Leq
mode the button does NOT cause the reading to go to zero. While 'RESET ALL' is
pressed the reading will be in an undefined random position as the meter is trying to
divide two very small numbers. 'RESET ALL' has no effect on SPL but does reset MAX
HOLD SPL. Do not hit the button hard or the CR:27x will integrate the resulting
acoustic noise of your finger on the button. This is particularly obvious on the 70 Peak
range where it almost impossible to use the button quietly enough NOT to generate a
noise.
Calibration Adjustment.
This is fitted above the LCD display and provides an adjustment to the amplifier gain of
the CR:27x. This is normally used for calibrating the CR:27x with the appropriate
microphone and calibrator.
