5560A/5550A/5540A
Operators Manual
62
10. Allow the DUT reading to settle and adjust R21 for a display reading of +1370.0 °C ±0.4 °C.
11. Push
R
on the Calibrator to remove voltage from the DUT. Disconnect the DUT from the
Calibrator. Power down the DUT by shorting the ON/OFF switch grid.
12. With an elastomeric switch pad in both hands, use the left one to short out the TP2 grid, and use
the right one to first turn on the instrument and then quickly short out the VIEW switch grid. Hold
this position until the display is held in self-test. This puts the DUT into the Reference Junction
Sensor calibration mode, and the VIEW maneuver turns off a filter so that the reading settled
immediately.
13. Using a type K thermocouple bead included with the Calibrator lead kit and the Calibrator TC
Measure mode (
Function
>
Measure
>
TC Measure
) measure the reference junction transistor
temperature by placing the K-bead into the middle hole of the isothermal block. The bead tip should
be placed into the well, against the body of Q1. Hint: Covering the well and positioning the bead
with a piece of tissue may help the bead stay in place. Do not hold the bead in place with your
hands as this may introduce a measurement error. Wait for the temperature reading to stabilize.
14. Adjust R16 for a temperature reading on the DUT that is the same as displayed on the Calibrator.
15. Power down the DUT and reassemble.
Maintenance
This section explains how to perform the routine maintenance and calibration task required to keep a
normally-operating Calibrator in service.
Refer to the Service manual found on the Fluke Calibration website for intensive maintenance tasks
such as troubleshooting, calibration or repair, and all procedures that require opening the cover of the
instrument. The Service Manual also contains complete, detailed verification and calibration
procedures.
XW
Warning
To prevent possible electrical shock, fire, or personal injury:
•
Disconnect the mains power cord before you remove the Product covers.
•
Remove the input signals before you clean the Product.
•
Use only specified replacement parts.
•
Use only specified replacement fuses.
•
Have an approved technician repair the Product.
•
Do not operate the Product with covers removed or the case open. Hazardous voltage
exposure is possible.
