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525B
Users Manual
6-8
Testing CJC (Cold Junction Compensation)
Connect a Type-J thermocouple to the TC terminals on the 525B. Immerse the
thermocouple and a precision thermometer in a mineral oil lag bath. The test setup
is shown in Figure 6-4.
Verify that the readings of the 525B and the precision thermometer are within the
Type-J specifications:
• 90-day specification is 0.14 °C
• 1-year specification is 0.16 °C
525B
Dewar Flask
and Cap
Mineral Oil
Lag Bath
J type
Thermocouple
Mercury
Thermometer
INPUT
OUTPUT
HI
VOLTS
mA
RTD
HI
LO
HI
LO
LO
TC
SENSE
INPUT/OUTPUT
4W RTD
SET RECALL
LOCAL EXP
AUTOSET
INPUT
OUTPUT
ZERO
RNG LOCK
C / F
CJC SETUP
20V PK
MAX
100V MAX
100mA MAX
20V PK
MAX
20V PK
MAX
0
•
1
2
3
4
5
6
7
8
9
/
VOLTS
mA
TYPE
UNITS
TC
RTD
SHIFT
ENTER
STBY
OPR
CE
fcn22f.eps
Figure 6-4. Connections for CJC Calibration
Note
Typical Type-J thermocouples do not have specifications accurate
enough to be used as a standard. To maintain a good Test
Uncertainty Ratio (TUR), a characterized Type-J thermocouple
many need to be used.
1.888.610.7664 sales@GlobalTestSupply.com
Fluke-Direct.com
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