Extech Instruments 407780A User Manual page 11

7. To set the recording function to start at a preset time;
a) Press and hold the DATE TIME button for 2 seconds to enter the PRESET recording
start‐time setting mode, the PrE symbol will be displayed.
b) A flashing cursor indicates the currently selected parameter (seconds), use the
▲▼buttons to set the current second.
c) Press the DATE TIME button to move to the next parameter (minutes) and use
the▲▼buttons to set the current minute.
d) Repeat step c) to set the current hour, day, month, and year.
e) Press DATE TIME to store the start time, and to exit this mode.
f) The ► and ‖ symbols will flash until the start time has been reached. The ► and ‖
symbols will then stop flashing and the REC symbol will begin flashing, indicating that
the measurements are being taken and that recording has started.
Clearing stored data
1. Press the
2. Press and hold the RECORD ERASE button and then press the
meter.
3. The CLr symbol will appear on the display indicating that the data have been erased.
Analog outputs
The analog outputs provide analog signals proportional to the measured values for recorders
and other devices. The outputs require a 3.5mm stereo mini‐plug.
AC Output:
An AC signal corresponding to the frequency‐weighted signal is available at this connector.
Output voltage: 2Vrms100mVrms (scale upper limit)
Output impedance: approx. 5kΩ
Load impedance: ≥ 1MΩ
The output voltage when the instrument is in calibration mode (‐6dB from scale upper limit,
1000Hz sine wave) is 0.5Vrms.
DC Output:
A level‐converted DC signal generated by RMS detection and logarithmic compression is
available at this connector. The signal reflects the frequency and time weighting settings of the
instrument.
Output voltage: 10mV0.1mV/dB
Output impedance: approx. 5kΩ
Load impedance: ≥ 1MΩ
The output voltage when the instrument is reading 94dB is nominally 0.94V DC.
800.561.8187
button to switch OFF the meter.
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button to switch ON the
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