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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.
VOLTS
mA
RTD
100mA MAX
HI
HI
OUTPUT
100V MAX
LO
LO
INPUT/OUTPUT
20V PK
MAX
4W RTD
HI
INPUT
SENSE
LO
20V PK
MAX
Nominal Voltage (mV)
-5.000
15.000
30.000
50.000
70.000
525B
VOLTS
TC
TYPE
STBY
OPR
mA
RTD
UNITS
TC
OUTPUT
INPUT
ZERO
7
8
9
SHIFT
SETUP
CJC
C / F
4
5
6
SET
RECALL
AUTOSET
20V PK
MAX
2
3
1
RNG LOCK
LOCAL
EXP
/
0
•
ENTER
CE
Figure 6-3. Testing TC Output
Table 6-5. TC mV
90 Day Spec (μV)
3.125
3.375
3.750
4.250
4.750
Maintaining the Calibrator
Performance Tests
8508A DCV Function
1 Year Spec. (μV)
3.15
3.45
3.90
4.50
5.10
6
fcn26f.eps
6-7
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