Fluke 5820A, Руководство по обслуживанию

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Calibration and Verification
DC Measurement Calibration
3
3-11
3-10. DC Measurement Calibration
This procedure uses the following equipment:
•
5520A calibrator
To set 5820A to the Voltage Measurement Calibration mode, select the CAL,
MORE CAL, and MEAS V CAL blue softkeys.
1. Using the N to BNC cable, connect the CHAN 1 connector on the Calibrator
Mainframe to the Fluke 5520A Calibrator voltage binding posts using a BNC to
banana connector.
2. Set the Fluke 5520A Calibrator to 6 Vdc (Operate).
3. Enter the actual Fluke 5520A Calibrator output.
4. When prompted by the Calibrator Mainframe, set the Fluke 5520A Calibrator to
-6 Vdc (Operate).
5. Enter the actual Fluke 5520A Calibrator output.
The Calibrator Mainframe will display that the calibration is complete. Press the
STORE CONST blue softkey to store the new calibration constants.
3-11. Current Calibration
These procedures use the following equipment:
•
Hewlett-Packard 3458A Digital Multimeter with cable
•
10
Ω,
100
Ω,
and 1000
Ω
precision resistor assemblies
Set the Calibrator Mainframe in CURRENT CAL mode. Remove the front panel
Current Loop using the 2 mm hex head driver and proceed with the following
procedures.
3-12. DC Current Calibration
1. Set the DMM to measure dc current.
2. Connect the DMM directly to the vacant banana jacks.
3. Take dc current measurements at 110 µA, 1.10 mA and 11.0 mA and enter the values
on the Calibrator front panel.
4. Press the GO ON blue softkey to proceed through the calibration points.
5. Follow the procedures on the front panel until the display reads “900 µA 1000 Hz”.
3-13. AC Current Calibration
For the ac calibration, the offset from 0 mA current (called the baseline) is measured and
stored in the Calibrator. Remove the DMM direct connection and set up the DMM to
measure dc volts. Follow the instructions in the section “Setup for Scope Calibrator
Voltage AC Current Measurements” above for setting up the DMM.
1. Plug in the 1000
Ω
precision resistor into the Calibrator front panel.
2. Attach the DMM to the ends of the precision resistor.
3. Take voltage measurement across the resistor at 900 µA, convert to mA, and enter
the DMM value on the Calibrator front panel.
4. Press the GO ON blue softkey.