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Maintaining the Calibrator
Performance Tests
6
6-7
Testing Thermocouple Output
For this test, the TC mV specifications will be used. When this test is combined
with the CJC test all functions of the TC output will have been checked. Typically,
the cable needed to connect the 525B to the 8508A will need to be fabricated. The
TC Mini-Connector will need Copper-Copper (White). Using Copper wire,
connect the Mini-Connector to standard Banana Jacks. See Figure 6-3 for a
connection diagram.
For this test, the CJC (cold junction compensation) must be turned off. Press
to turn off the CJC. XCJC on the display indicates that the CJC is turned off.
Select TC, Output by pressing . Press until mV/°C is shown on the
display. Output the mV values listed in Table 6.5.
525B
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
8508A DCV Function
fcn26f.eps
Figure 6-3. Testing TC Output
Table 6-5. TC mV
Nominal Voltage (mV) 90 Day Spec (µV) 1 Year Spec. (µV)
-5.000 3.125 3.15
15.000 3.375 3.45
30.000 3.750 3.90
50.000 4.250 4.50
70.000 4.750 5.10
1.888.610.7664 sales@GlobalTestSupply.com
Fluke-Direct.com
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