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Maintaining the Calibrator
Performance Tests
6
6-7
Testing Thermocouple Output
The first section of this test is to check the accuracy of the thermocouple output
with K-type selected. The second section will be used with CJC on and a K-type
thermocouple in a lag bath.
For this test, the CJC (cold junction compensation) must be turned off and the
leads and mini-connector must be copper and copper. Press
I
5
to turn off the
CJC. XCJC on the display indicates that the CJU is turned off. The mini-connector
will have the designation “Cu” for copper and copper. Connect the mini-connector
to the front of the 525A TC input/output connector and the other end to the
Wavetek 1281 DC voltage input. See Figure 6-3 for a connection diagram. Output
the simulated thermocouple temperatures listed in Table 6.4.
525A
1281
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
525A
TEMPERATURE / PRESSURE CALIBRATOR
0
•
1
2
3
4
5
6
7
8
9
/
VOLTS
mA
TYPE
UNITS
TC
RTD
SHIFT
ENTER
STBY
OPR
CE
ajr26f.eps
Figure 6-3. Testing TC Output
Table 6-4. TC Temperatures
Temperature (
°
C)
Nominal Voltage (mV)
90 Day Spec (mV)
1 Year Spec. (mV)
–200
–5.891
0.0047
0.0047
–100
–3.554
0.0061
0.0061
–25
–.968
0.0068
0.0068
120
4.92
0.0081
0.0081
1000
41.276
0.0089
0.0094
Summary of Contents for 525A
Page 8: ...525A Users Manual vi ...