620 Series
25
Audio socket
An AC output is available via a 2.5mm stereo audio jack (Barrel ground, Tip AC output)
provided for remote monitoring, DAT tape / PC wav file recording or headphone
applications.
The output level can be set Low or High see System Tools.
On the low range, a full-scale AC output of approximately 0.4 Vrms corresponds to a
maximum sound pressure level of 96 dB. On the high AC output range, a full-scale output of
approximately 0.94Vrms corresponds to a level of 140dB.
The AC output signal corresponds to the Z-weighted response of the instrument and has an
output impedance of approximately 2.2 kΩ.
If you use the AC output, you should make certain the load impedance is as high as possible,
and you should use a screened or co-axial cable of length 0.5 m to 10 m.
Note: Some offset and scaling will be required on the measuring system for accurate
measurements.
A DC output is also available via the same 2.5mm stereo audio jack (Barrel ground, Ring DC
output) provided for chart recorders, loggers etc.
Approx 1.4V DC full scale output corresponding to 140dB. Output impedance approx. 2.2k.
Load impedance should be as high as possible.
The DC output corresponds to the A weighted, Fast time response of the sound level meter.
Note: DC power input ground should be kept isolated from any signal ground
System Tools
This can only be selected during instrument initialisation by
pressing the and keys simultaneously as indicated on the
instrument screen.
The primary function is for calibration laboratories or diagnostic
purposes and three options are available:
• ‘Set USB Disk R/W’ allows the mass storage device to have data
written to it.
• ‘Format All Memory’ will format the USB memory.
• AC Output sets the output level Low or High (as shown in the
Audio Socket section).
Note: All measurement data will be lost if the Memory is formatted!
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