754_____cmeng0000.pdf - 第31页

Documenting Process Calibrator Performance Verification Tests 23 Thermocouple Measure To verify the thermocouple measure function. 1. Use Type-K thermocouple wire and copper wire to connect the 5522A output to the UUT-TC…

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Calibration Manual
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TEKTRONIX FCA3000 Counter
Fluke 75x
Fluke 123
Use Channel A
BNC Input
gso11.eps
Figure 9. Frequency Source Verification Connections
Table 12. Frequency Source Verification Points
UUT Range Frequency @ 1 Vpp
Minimum
Fre
q
uenc
y
Maximum
Fre
q
uenc
10.99 Hz 5 Hz Sine 4.99 Hz 5.01 Hz
1099.9 Hz 1 kHz Sine 999.9 Hz 1000.1 Hz
21.999 kHz 10 kHz Sine 9.998 kHz 10.002 kHz
50 kHz 49 kHz Sine 48.995 kHz 49.005 kHz
10.99 Hz 5 Hz Square 4.99 Hz 5.01 Hz
1099.9 Hz 1 kHz Square 999.9 Hz 1000.1 Hz
UUT Range Frequency @ 7.5 Vpp Minimum Frequency Maximum Frequency
109.99 Hz 50 Hz Square 49.9 Hz 50.1 Hz
Documenting Process Calibrator
Performance Verification Tests
23
Thermocouple Measure
To verify the thermocouple measure function.
1. Use Type-K thermocouple wire and copper wire to connect the 5522A output to
the UUT-TC jack as shown in Figure 10. The Type K-to-Copper junctions must
be welded or made with tight screw terminals and submersed in the lag bath
(room temperature). Use the standard thermometer (0.1 °C accuracy) to measure
the temperature of the lag bath.
2. Set the 5522A to source dc millivolts and the UUT to the thermocouple measure
function, TC Type K; ITS-90 scale, internal reference, and °C.
3. Stop for a minimum of 1 minute for thermal “emfs” (caused by insertion of the
connectors) to dissipate, and let the lag bath become stable for a minimum of
15 minutes.
4. Use the 5522A to source the millivolt equivalents of the temperatures in
Table 13. At each point, correct the 5522A output voltage. To do this, subtract
the millivolt equivalent of the temperature at the lag bath junction (use reference
chart below).
5. Continue through the test points. See if the value shown on the UUT is in the
range shown in the applicable column of Table 13.
6. When you complete the test, set the 5522A to STANDBY.
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5522A
CALIBRATOR
Fluke 75X
Room Temperature
Lab Bath
Fluke 1551A Ex
Thermometer
Fluke 5522A
TYPE-K
Thermocouple
Wire
CuCu
gso12.eps
Figure 10. Temperature Measure (TC) Verification Connections