Table C.8.3. Pin-out of 5.5 / 2.1 connector
Instrument can be also powered from the USB port of a PC. however following conditions and limitations should
be considered:
• Till the internal battery voltage is higher than approx. 4.6 V. the instrument operates from internal battery.
• When the internal battery voltage decreases below 4.6 V and the USB is connected to a PC. the instrument
switches to operate from the USB (that is indicated by the removal of the "Battery" icon from the display).
• current capability of the USB port should be as high as 250 mA. in the case of battery-powered PCs this
additional current requirement should be considered by the user.
• when an external power supply (e.g. SA 17 or car battery) is connected to Ext. Power terminal no supply
current is drawn from the USB. as well as from internal battery.
I/O connector
User programmable Input / Output connector
AC Out (Analogue Output) - standardized output of the measured input signal from user-
programmable one of four channels (no weightings)
LEMO type ERN.00.250 compatible socket (external view)
Table C.8.4. Pin-out of the LEMO type ERN.00.250 connector
Socket LEMO type ERN.00.250 compatible
Output Voltage 0.2 V
RMS
( 5 %) at input level 105 dB (dB related to 1 µV) for Low range
0.2 V
RMS
( 5 %) at input level 130 dB (dB related to 1 µV) for High range
Frequency Band (-3 dB) - 0.6 Hz ÷ 22.6 kHz
Output impedance 51 / 1%
I / O (Input/Output) digital Input / Output pin - 3.3 V input & output levels.
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