Manual

b. Calibration Panelb. Calibration Panel
b. Calibration Panelb. Calibration Panel
b. Calibration Panel
The Minilyzer ML1 enables the calibration of microphones, such as the
MiniSPL.
Select CALIB. in the LEVEL SPL panel field. Press the enter key and the
calibration screen SET SENSITIVITY ... will be displayed (Fig 14). The
following three calibration modes are available:
TO DEFAULT MINISPL-MIC: All MiniSPL are factory calibrated to a
sensitivity of 20.0 mV/Pa. Reset to default setting:
• Select the GO! field on the left.
• Press the enter key to start.
• OK! is shown to confirm the completed calibration.
USING EXT. REF.: The sensitivity may be adjusted with an external
calibrator to produce a certain calibrated sound pressure level.
• Select the dB
SPL
-value, press the enter key and adjust with the
cursor keys the sound pressure level generated by the calibrator.
Use up/down keys for 1.0 dB
SPL
steps and left/right keys for 0.1
dB
SPL
steps. The setting range 80 - 140 dB
SPL
is supported.
• Confirm the setting with the enter key.
• Produce the specific reference signal with the calibrator to the
microphone attached.
• Press the left cursor key to select the GO! field and press enter to
execute the calibration, whilst the reference signal of the calibrator
is still present.
• The frame WORKING ... followed by the frame CALIBRATION
FINISHED! is shown centered on the calibration screen if all has
been found in good order (see Fig 15). Otherwise various error
indications may be displayed to inform the user about the
Measurement Functions
3-06
Fig 14 Calibration Panel
detailed calibration problem.
• The new sensitivity is calculated by the Minilyzer and shown below
USING EXT. REF.: in mV/Pa.
• Press the ESC button to exit the calibration mode and return to
the LEVEL SPL screen.
• Check the calibration by applying the reference signal again to
the attached microphone. The sound pressure level of the calibrator
shall be shown to confirm the calibration is carried out in good
order.
Error indications will appear during the calibration caused by low/
high input level or the calculated sensitivity is out of the range 2 - 80
mV/Pa.
MANUALLY:
• Select the setting value xx.x mV/Pa.
• Press enter and select with the cursor keys the sensitivity according
to the attached microphone, use up/down keys for 1.0 mV/Pa
steps and left/right keys for 0.1 mV/Pa steps. The setting range 2
- 80 mV/Pa is supported.
Simply press the ESC button to exit from the calibration screen back to
the LEVEL SPL screen. The new measurement is started immediately.
3-07
Fig 15 Calibration Finished