With a sound meter calibrator, you can verify the output level of a measurement mic so that you know that your SPL measurements are accurate. Yesterday I secured an AMP SM-CAL1 with 1/4″ adapter for around $100 on Ebay. Between the 1/2″ and 1/4″ adapters I should be able to maintain all of my measurement mics.

AMPROBE SM-CAL1 sound meter calibrator webpage

AMPROBE SM-CAL1 sound meter calibrator data sheet PDF

AMPROBE SM-CAL1 sound meter calibrator product manual PDF

QUOTE:

“The Amprobe SM-CAL1 is a sound meter calibrator with two output levels of 94 dB and 114 dB. The calibrator generates these fixed sound level signals for calibration of sound level meters. The unit ships with a ½” adaptor installed to accommodate sound meters and microphones with ½ diameter.

Battery: 9V, 006P or IEC 6F22 or NEDA 1604.
Electrical (sound) standard: ANSI S1.40-1984 and IEC942 1988 Class2.
Output sound level: 94dB and 114dB re 20 uPa under reference.
Accuracy: ± 0.5 dB.
Output frequency: 1 kHz ± 4 %
Two output levels of 94dB and 114dB
Output frequency of 1000Hz
Fits ½” microphones
Easy one handed operation
Low battery indicator
CE, conforms to ANSI S1.40 – 1984 and IEC942 – 1988 class 2
Includes ½” adapter, 9V battery and users manual

This is taken from the user manual (ENGLISH)

In a future post I will provide details as to how to use one of these devices.