Sourcing Resistance (Rtds) - Ecom Instruments PTC 400 Instruction Manual

2. Make sure the PTC 400 is in the Input Mode
(Note: that it will indicate 2, 3, or 4W in the upper left corner of the LCD).
To set the desired wire configuration use the Up/Down arrow keys to toggle through the 2,
3, and 4 wire modes.
Measuring a 2 Wire RTD or Using the Continuity Function
E. Sourcing Resistance Into a RTD Transmitter
1. As described previously in section A the PTC 400 can source resistance in a RTD Transmitter
or measuring device. In many cases the unit under test will require a 3 or 4 wire connection to
achieve best accuracy. Refer to Figure 5 for connection information.
Measuring a 3 Wire RTD
Measuring a 4 Wire RTD
Figure 4.
Figure 5.
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