Connection is made between the Hz and COM terminals.
The input signals are converted into a logic signal as in the
case of signal frequency or hard contact measurement.
If you enter a zero counting time, the counting lasts indefi-
nitely.
To initiate counting, confirm with the
Start
function key ("F3").
To stop counting without resetting the counter value, confirm with the
Stop
key.
To reset the counter to zero, press the
Clr
key
(F4).
The counting period is displayed in the left part of the IN window. This period is reset when-
ever counting is stopped.
2.2.8
Temperature measurement (RTD)
•
Display the
MEASUREMENT CONFIGURATION
dialogue
box.
•
Select the
Rt
measurement function, then the appropri-
ate "type of probe" using the function and navigation
keys.
•
Select the display unit.
•
Confirm with ENTER.
Connection is made according to the number of wires of the resistive probe.
The following probes are available:
α
being the temperature coefficient of the probe.
The resolution is 0.01 °C for all the available resistive probes.
The MC 75.2 displays an icon showing the connections used
(
for 2 wires,
for 3 wires or
for 4 wires) to carry
out the measurement.
The wiring arrangement is automatically detected by the calibra-
tor.
IMPORTANT!
In order not to introduce an error when measuring with
3 wires, the following is recommended:
Measure using conductors of the same length, the same diameter and the same type of
metal (a difference of 40 m
Ω
between two wires introduces an error of about 0.1°C).
Take care with the connections to avoid the appearance of interfering contact potential
difference (EMF).
Use thimbles with clevis to reduce the resistance of the terminal.
Sensor
Pt 50(
α
= 3851)
Pt 100 (
α
= 3851)
JPt 100 (
α
= 3916)
Pt 100 (
α
= 3926)
Pt 200 (
α
= 3851)
Pt 500 (
α
= 3851)
Pt 1 000 (
α
= 3851)
Ni 100 (
α
= 618)
Ni 120 (
α
= 672)
Ni 1 000 (
α
= 618)
Cu 10 (
α
= 427)
Cu 50 (
α
= 428)
