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525B
Users Manual
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
mA
VOLTS
RTD
100mA MAX
HI
HI
OUTPUT
100V MAX
LO
LO
20V PK
MAX
4W RTD
HI
INPUT
SENSE
LO
20V PK
MAX
J type
Thermocouple
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.
6-8
STBY
VOLTS
TC
TYPE
OPR
mA
RTD
UNITS
TC
INPUT/OUTPUT
OUTPUT
INPUT
ZERO
8
9
7
SHIFT
SETUP
CJC
C / F
4
5
6
SET
RECALL
AUTOSET
20V PK
MAX
1
2
3
RNG LOCK
LOCAL
EXP
/
0
•
ENTER
Figure 6-4. Connections for CJC Calibration
CE
Mineral Oil
Lag Bath
Note
Mercury
Thermometer
Dewar Flask
and Cap
fcn22f.eps
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