Inputs - Ranges - Intab PC-Logger 3100i How To Use Manual

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INPUTS - RANGES

All analogue channels are DIFFERENTIAL. They measure the voltage
between - and GND and the voltage between + and GND. The subtraction is
then performed internally.
NOTE
The GND is logger reference or signal ground. It has nothing in common with
other system or safety grounds unless the operator interconnects them.
When we in the following pages refer to GND or ground we only mean the
logger ground. NOTHING ELSE!
Standard inputs are balanced. This makes them very insensitive to noise if the
signal source is correctly connected. A signal cable consisting of a twisted pair
can be very long if the lowest potential of the source is connected to ground
via a separate cable.
The input ranges are set, adjusted and calibrated at factory prior to shipment.
Two main types of inputs are available: preset channels and "Software Range
Switchable".
Preset channel units are individually "ranged", adjusted and calibrated, and
cannot be altered by the user. They have to be returned to factory for
modification.
"3100i":s with Software Range Switching has four programmable ranges per
channel. The range (or Full Scale Reading) of each channel is selected, or
programmed, together with the rest of the "parameters" before the recording is
started.
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BASIC UNIT