Page 3.4
3.2.3. Temperature measurement with Pt100/Pt1000
The Pt100/Pt1000 probe must be connected to the + and – terminals.
The current is injected through the “┴” terminal.
For a 4 wire Pt100/Pt1000, the mounting will be in 3 wires, the 4th wire will not be
connected.
Warning: the “┴” current injection is shared by all the channels.
Wiring:
2 wires
3 wires
3.2.4. Resistance measurement
The resistance must be connected to the + and – terminals. A current injection is performed
in 2 wires.
3.2.5. Current measurement
You can make current measurement by
shunt
between the + and - terminals of the relevant
input.
You will use either an external resistance or
the SEFRAM shunt (ref 902406500 : 50Ω)
In this case, select the “
current
” type among the parameters of the relevant channel.
Connect the measurement wires to the shunt terminals.
3.2.6. Connection of the ground
If the source of the signal you have to record has
low internal impedance
, you shall use
twisted wires
. In case of
high impedance
, you shall use
shielded wires
.
When gathering grounds from the various items on the measurement line, it is good to
check that there is no voltage difference between them, in order to prevent any shortcut. If
any doubt, make a measurement with a voltmeter on a low resistance (i.e. 1kΩ) between the
terminals.
If any important noise,
o
When using the battery , connect the GND connection to the ground(§ 2.2.1 )
o
use the sampling period for each channel >20ms (§ 2.1.1 )
o
an appropriate capacity can be placed between the ground and the – wire of the
signal.
Summary of Contents for DAS220
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