Galaxy Audio CHECK MATE CM-140 - Manual (Page 8)

Signal Ground
Š CAL Potentiometer
Calibration control, for level calibration adjustment.
Battery Cover
V. Calibration Procedures
Using a standard Acoustic Calibrator
(94dB, 1KHz Sinewave)
CM-140 SPL METER
6
‰ AC Output Terminal
1 Vrms Corresponding to each range step.
Output impedance: 100 ohms
Output signal by standard 3.5mm coaxial socket signal
on pin.
130