Internal Or External Reference Junction Compensation May Be Used With This Instrument; Tc Internal Reference Junction; Tc External Reference Junction; Probe Lock Function - Fluke 1523 Technical Manual

3.3.1 Internal or External reference junction compensation may be used with
this instrument.
3.3.2

TC Internal Reference Junction

With internal reference junction compensation, the temperature of the Thermocouple
connection is measured automatically and used to calculate the absolute temperature
of the thermocouple. The infocon reference junction parameter must be programmed
to Internal, and the external temperature parameter in the infocon will be ignored.
3.3.3

TC External Reference Junction

With External Reference junction compensation, the reference junction is held at a
known fixed temperature. The value of the fixed temperature reference is used to
calculate the absolute temperature of the thermocouple.
In this method, the reference junction is created externally and copper wires connect
the reference junction to the 1523/24. The reference junction is placed in an ice bath
or other temperature source that has a precisely known and stable temperature. This
technique offers improved accuracy but is less convenient because of the more compli-
cated connection scheme and the requirement of a precision temperature source.
The external reference temperature parameter and the external reference junction
parameter must be set in the infocon connector prior to using this method.
Temperature is generally sensed at the tip of the probe. To get an accurate temperature
measurement the probe sheath should be well immersed, with adequate depth and fit
into the medium to be measured.
Caution: Probes are fragile devices that can be easily damaged by mechanical
shock, overheating, and absorption of moisture or fluids in the wires or hub.
Damage may not be visibly apparent but nevertheless can cause drift, instability,
and loss of accuracy. Observe the following precautions:
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3.4 Probe Lock Function

The 1523 may be locked for exclusive operation with a specific probe, for quality con-
trol purposes, and each channel of the 1524 may be locked with its own unique probe.
Locking the probe also prevents use with other readouts, until the probe is unlocked.
To set the probe lock, plug in the probe to the channel that you want to lock it to. First
send the unit password enable command, SYST:PASS:CEN XXXX (where xxxx is the
unit password) through the serial port using the 9940 software or a terminal program.
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Do not allow probes to be dropped, struck, bent or stressed.
Do not overheat probes beyond their recommended temperature range.
Do not allow any part of the probe other than the sheath to be immersed in fluid.
Do not allow the probe hub or wires to be exposed to excessive temperatures.
Keep the probe wires clean and away from fluids.
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General Operation
Probe Lock Function
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