Extech Instruments HD600 Guide de l'utilisateur télécharger pdf (Page 7)

HD600 V1.2 8/07 7

ANALOG OUTPUTS

The meter is equipped with an analog output feature. The analog

output jack is located on the meter’s side panel and requires a 3.5mm

stereo phono plug. (1-AC Output, 2-DC Output, 3- Ground)

AC analog output

The AC output is a retransmitted representation of the meter’s measurement (note that

the output factors in the meter’s frequency weighting selection ‘A’ or ‘C’).

• Output voltage: 1Vrms at full scale of the selected range.

• Output impedance: 100Ω approx.

DC analog output

The DC output signal reflects the frequency weighting selected (‘A’ or ‘C’).

• Output voltage: 10mV (±1mV) per displayed dB.

• Output impedance: 1KΩ approx.

Calibration

Frequent calibration is recommended and is often required by noise

standards and directives.

1. Turn the meter ON

2. Put the meter in the ‘A’ weighting mode

3. Put the meter in the ‘SLOW’ response mode

4. Place the calibrator onto the microphone.

5. Turn the calibrator ON.

6. Adjust the meter’s CAL potentiometer located on the side panel

so that the meter’s display matches the output of the calibrator

(typically 94dB or 114dB).

Battery Replacement

1. The battery icon will appear on the display when the battery needs replacing.

2. Turn the meter OFF and slide the rear battery cover off.

3. Install the 9V battery and replace the cover.

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Extech Instruments HD600 Guide de l'utilisateur Page 7