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All possible configurations are shown in Figure 3 on page 18.
6.4.1 Connecting a PRT or Thermistor Probe
PRT and thermistor probes are attached to the resistance input module via Hart
Scientific mini-DWF connectors. These patented connectors accept bare wire,
spade, or mini banana plug terminations. The connectors are color coded for
ease in connecting lead-wires.
When using 2- and 3-wire sensors, the accuracy of the 1529 is reduced as
stated in the specifications. Compensation is made for 3-wire PRTs, but the dif
-
ference in lead resistance affects the measurement accuracy. The 1529 ther
-
mometer readout is unable to compensate for 2-wire lead resistance.
Attach the lead-wires of the probes as shown in Figure 5 on page 24. The top
termainals sense current and the bottom terminals sense potential.
6.4.2 Connecting a Thermocouple
The 1529 thermocouple input module accepts both standard and sub-miniature
size thermocouple connectors. The connection is made with the positive termi-
nal on the right and the negative terminal on the left. You must use a connector
that matches the thermocouple type for the internal RJC to be accurate. For ex-
ample, if you are using a type K thermocouple you must also use a type K con-
nector, which is made from the same type of metal. For best results, wait two
minutes before measuring after inserting the thermocouple connector into the
input module.
23
6 General Operation
Probe Input Modules
RS-232
IEEE-488 (option)
POWER
1 AMP
14.5–16V
CHARGING
IR PORT
FUSES INTERNAL - 1 AT 125V
FLUKE CORPORATION
HART SCIENTIFIC DIVISION
www.hartscientifc.com
CHANNEL CONFIGURATION
CH1 CH2
CH3 CH4
–
+
Figure 4 Thermocouple Connections