Fluke Portable Multimedia Player 8842a User Manual

Instruction Manual

6-20

readings. (In remote calibration, the averaged value can be stored in the controller.)
Record the value.

4.

 

Select the "100

Ω

" output from the 5450A, and measure this value as in step 3.

5.

 

Find and record the numerical difference between the values calculated in steps 3 and
4. This value will be used as the variable  input for calibrating the 200

Ω

 range in 2-

wire ohms.

6.

 

Repeat steps 4 and 5 using the "1 k

Ω

" output from the 5450A; find and record the

numerical difference between this and the "SHORT" measured in step 3. This value
will be used as the variable input for calibrating the 2 k

Ω

 range in 2-wire ohms.

7.

 

Press the UUT’s 2 WIRE k

Ω

 button. This selects the Offset and Gain calibration

procedure for the 2-wire ohms function and prompts for zero input. Select the
"SHORT" from the 5450A, and calibrate all the zeros by pressing STORE.

8.

 

Select the "100

Ω

" output from the 5450A and calibrate the high point for the 200

Ω

range, entering the value computed in step 5 as a variable input.

9.

 

Select the "1 k

Ω

" output from the 5450A and calibrate the high point for the 2 k

Ω

range, entering the value computed in step 6 as a variable input.

10.

 

Calibrate the remaining ranges (steps D-G of Table 6-10) using the 5450A outputs.

11.

 

Recalibrate the low point for each 2-wire ohms range using a shorting link (Pomona
MDP-S-0 or equivalent) across the UUT’s HI and LO INPUT terminals.

12.

 

Exit the calibration mode by pressing the CAL ENABLE switch.

13.

 

Using the same configuration shown in Figure 6-4, verify that the UUT measures the
same value (within 1 digit) in 2-wire ohms (using the offset feature to correct for
5450A floor error) as in 4-wire  ohms. If the readings differ by more than 1 digit,
reenable the calibration mode and repeat steps 2 through 8.

Ω

14.

 

Cover the CAL ENABLE switch with a calibration certification sticker.

f6-04.wmf

If the IEEE-488 Interface is installed, the 8842A can be calibrated under remote control.
Remote calibration is very similar to local (front-panel controlled) calibration. Table 6-14
shows the remote commands which correspond to the front panel features.To facilitate
remote calibration, there are some differences from local calibration: