Fluke 5220A User Manual

Instruction Manual

4-10

The following procedure is used to check the dc accuracy of the 5220A output current:

1.

 

Connect the precision shunt to the enabled output terminals on the 5220A.

2.

 

Connect the DVM to the sense terminals on the precision shunt. Observe polarity.

3.

 

Set the DVM to the 200 mV dc range.

4.

 

Connect the output of the dc voltage calibrator to the VOLTAGE INPUT terminals
on the 5220A; positive to red, negative to black.

5.

 

Set the dc voltage calibrator to the output shown in step 1 of Table 4-2 (+10.0000 V
dc).

6.

 

Set the 5220A to the operate mode.

7.

 

Using the DVM reading and the calibrated shunt valve, calculate the output current
(I = E/R). The calculated value should be within the limits shown in the table.

8.

 

Vary the line voltage +10 % from nominal and verify a less than 0.001 % change in
output current.

9.

 

Sequentially set the calibrator output to the voltages shown in steps 2 and 3 of Table
4-2. At each voltage setting verify the 5220A output accuracy by repeating step 7 of
this procedure.

10.

 

Set the 5220A to the standby mode.

11.

 

Set the dc voltage calibrator output to zero volts and disconnect it from the 5220A.

12.

 

Disconnect the precision shunt from the 5220A output terminals.

1

+10.0000

+9.9965 to +10.0035

2

+20.0000

+19.9940 to +20.0060

3

-10.0000

-10.0035 to –0.0065

This procedure is used to measure the harmonic distortion present at the output of the
5220A.

1.

 

Set the output of the ac voltage calibrator to zero and connect it to the 5220A
VOLTAGE INPUT terminals.

2.

 

Connect the load resistor (0.1 ohms) to the enabled (front/rear) output terminals.

3.

 

Connect the distortion analyzer to load resistor sense terminals.

4.

 

Set the ac voltage calibrator output to 20 V rms at 1 kHz.

5.

 

Set the 5220A to the operate mode.

6.

 

Measure the output distortion on the distortion analyzer. It should be less than or
equal to 0.075 %.