User Manual

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LTC2 LoRaWAN Temperature Transmitter 29 / 32
6.2 How to connect a customized PT100 cable?
The LTC2 has two channels means it can connect 2 x PT100 cables. Besides use the PT100 cables
provided by Dragino, User can connect their PT100 probes. When connect to a user PT100 probe,
we recommend that user do a calibration to eliminate the effect from the cables so to get the
best accuracy. Below is the step for calibrate on a
three wire PT100 probes. There is no step for 2
wire probe calibration at the moment.
Step 1: You need a multimeter can measure the accuracy of 0.001 ohm. We use Agilent 34401A
digit multimeter. And will do test to make sure the multimeter accuracy before the measurement.
Check the shortcut resistance of the multimeter.
We know that the Multimeter has a shortcut resistance 0.002 ohm.