IET Labs 1565-E, Руководство пользователя и обслуживания

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adjustment. The calibration adjustment potenti-
ometer is located on the front panel beneath the
FUNCT switch. Put the switches to the F , Hi ,
A , a CAL 94dB positions and adjust the poten-
tiometer for a display of exactly 94.0dB.
3.3.2 External Calibration
Attach an external sound level calibrator such
as the IET Labs 1562-A Sound Level Calibra-
tor (1kHz at 114 dB) or similar calibrator at
94 dB or 114 dB, completely over the micro-
phone. Set the meter to
F , Hi , and A , and ad-
just the potentiometer for a display of exactly
94.0dB or 114 dB for 1562-A.
If the internal and external settings are not
within 1.5dB of each other, the meter will
require repair.