81
Calibration of Your Reference Thermometer Readout
Manual Calibration Process
7.8.2 Cabling
Use short (<1 meter) four-wire cabling from the UUT to the resistance and voltage ref-
erences. The cabling should be connected to a Lemo Connector that does not contain a
probe memory IC.
The 4-wire resistance connection uses pins 1 and 2 for one side of the reference resis-
tor and pins 3 and 4 for the other side.
For the voltage calibration, connect only pins 2 and 3 to the voltage source. Pin 3 is
the positive terminal and pin 2 is the negative terminal.
The thermocouple reference junction resistance test uses pins 1 and 4 to connect to the
10K reference resistor. This is a two wire connection for this test; DO NOT connect
any other pins.
7.8.3 Scan Mode
The UUT must have the Fast Scan Mode and the Auto-Off mode turned off. Refer to
the Instrument Settings menu.
7.8.4 AC Adapter
The UUT can be calibrated with or without the AC adapter. If using batteries, ensure
they are new before starting the calibration procedure.
7.9 Manual Calibration Process
NOTE: 1. The 1523/24 is tested and calibrated using the tests outlined below in the
order indicated. Details on performing each of the tests can be found in the subsequent
section of this document.
2. For test specifications, durations, soak times, and other detailed information, refer
to the specification tables below.
Table 28 1523/24 Accuracy Test Settings and Specifications
Resistance
Range
Reference
(Nominal) (Ω) Soak (Sec) Samples
Spec
(±Ω)
Std Dev
Spec (±Ω)
L75_OHMS 0 20 40 0.002 0.0005
25 20 40 0.003 0.00075
75 20 40 0.005 0.00125
LO_OHMS 75 20 40 0.005 0.00125
100 20 40 0.006 0.0015
200 20 40 0.01 0.0025
400 20 40 0.018 0.0045
MED_OHMS 200 20 40 0.52 0.13
400 20 40 0.54 0.135
10k 20 40 1.5 0.375
40k 20 40 4.5 1.125
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