pico Technology PT-104, User Manual, Page: 13 / 22

PT-104 Data Logger User's Guide 9
Copyright © 2013 Pico Technology Ltd. All rights reserved. usbpt104.en r2
2.6
Connection: PRT inputs
The PT-104 Data Logger is compatible with PT100 and PT1000 type platinum
resistance thermometers (PRTs). Connect each one of these devices to the unit as
follows.
Pin Connections to the PT-104 Data Logger Mini-DIN socket
Pin PT100, PT1000
or Resistance
4-Wire
PT100, PT1000
or Resistance
3-Wire
PT100, PT1000
or Resistance
2-Wire
Differential voltage
1 White Connect to pin 3 Connect to pin 3 Do not connect
2 Red Red Red V -
3 White White White V +
4 Red Red Connect to pin 2 Gnd
Single-ended voltage connection
Single-ended mode allows you to double the number of channels from 4 to 8. It is
supported by the driver, so you can use it in your own applications. It is not, however,
supported by the PicoLog software.
Connector Channel Pin
1
1 3
5 2
2
2 3
6 2
3
3 3
7 2
4
4 3
8 2
Note on Differential Voltage Mode
The maximum input voltage range of the PT-104 Data Logger is 2.5 V. Any voltage in
excess of ±30 V on any input pin may cause permanent damage to the unit.
In Differential Voltage Mode, the input connector should be treated as a differential
input with reference to ground. Both inputs (V+ and V-) must be zero volts or above
(it does not matter which input has the higher voltage) and must remain within the
input range. A ground reference connection is also required for correct operation. The
ground connection of each mini-DIN socket consists of a 100 resistor to mains
earth/ground through the USB cable outer braiding and the PC chassis.