Campbell CURS100 Manual de usuario Pagina 12

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CURS100 100 Ohm Current Shunt Terminal Input Module
4
Figure 3-1. CURS100 L terminal connected to a datalogger G terminal
using a jumper wire.
Normally the L terminal on the CURS100 should be connected to a
datalogger G terminal (power ground) with a jumper wire (Figure
3-1). Connecting the L terminal to the adjacent ground ( or G)
terminal on the CURS100 can result in unwanted return currents on
the datalogger signal ground, which could induce undesirable offset
errors in low-level, single-ended measurements. The G terminal on
the CURS100 can be used to connect cable shields to ground.
4. Transducer Wiring
Current transducers differ mainly in how they are powered and in the relative
isolation of the current output. In this section, the transducers are grouped by the
total number of wires the transducer uses to obtain power and output the current.
4.1 Two-Wire Transducers
In a two-wire transducer, the power supply is in series within the current loop.
The transducer regulates the amount of current that flows; the current drawn from
the battery is exactly the current used as a signal.
Figure 4-1. 2-wire with datalogger power
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