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AmpConnect 621
™
Manual Hardware and Calibration 19
5. Place the acoustic calibrator on the reference microphone
and click Calibrate to measure its sensitivity.

If the Measured Sensitivity is outside the manufacturer’s
specifications, a flashing FAILED message will appear.
Check your connections and make sure the calibrator is
turned on before assuming something is wrong with the
microphone.

If a Reference Frequency of 1000 Hz is entered, but the
Calibrator’s actual frequency is 1008 Hz, the Calibration
may Fail. To verify the Calibrator’s frequency, use the
Spectrum Analyzer under the Main Screen - Instruments
menu.

The meter in Figure 4-18 indicates the corresponding dB level relative to 1 Volt per Pascal. If it
varies by a few tenths of a dB from the last calibration measurement, do not be alarmed, this is
normal. If it varies by more than 1 dB or failed the sensitivity test, the microphone should be
checked by a qualified calibration lab.
TEDS Microphone
AmpConnect 621 supports TEDS transducers. Click on
Read TEDS in the Calibration Editor when a TEDS
transducer is connected to an AmpConnect 621 input.
The Sensitivity value automatically updates along with
the serial number and calibration date for the
connected transducer.
Figure 4-18: Calibrate
Figure 4-19: TEDS