Fluke Car Amplifier 5220A User Manual
Maintenance
Performance Test
4
4-11
7.
Set the 5220A to the standby mode.
8.
Disconnect the load resistor and the distortion analyzer from the 5220A output
terminals.
terminals.
4-26. Frequency
Response
Note
When high ac currents at high frequencies are being used, and
minimization of inductive coupling is required, it is recommended that you
twist the current carrying leads between the 5220A and load. Also, any
measuring instruments used with the load should be kept at least eighteen
inches away the load to prevent radiation from affecting its reading.
minimization of inductive coupling is required, it is recommended that you
twist the current carrying leads between the 5220A and load. Also, any
measuring instruments used with the load should be kept at least eighteen
inches away the load to prevent radiation from affecting its reading.
The frequency response of the 5220A is checked using the following procedure:
1.
Connect the precision shunt (.01 ohm) to the enabled (front/rear) output terminals.
2.
Connect the true rms voltmeter to the sense terminals on the precision shunt.
3.
Set the ac voltage calibrator output to the voltage and frequency shown in step 1 of
Table 4-3 (20.0000 V @ 100 Hz).
Table 4-3 (20.0000 V @ 100 Hz).
4.
Set the 5220A to the operate mode.
5.
Read the true rms voltmeter and calculate the current. It should indicate a current
within the limits shown for step 1.
within the limits shown for step 1.
6.
Sequentially set the calibrator output to each of the frequencies shown in steps 2
through 5 of Table 4-3. At each frequency verify that the measured current is within
the limits given for that step.
through 5 of Table 4-3. At each frequency verify that the measured current is within
the limits given for that step.
7.
Set the 5220A to the standby mode.
8.
Disconnect the precision shunt from the 5220A output terminals.
Table 4-3. Frequency Response Test
Step
AC Voltage Calibrator Output (V rms)
Measured Output Current (Amps)
1
20 V @ 100 Hz
19.970 to 20.030*
2
20 V @ 300 Hz
Reading 1
±
0.05 %
3
20 V @ 1 kHz
Reading 1
±
0.05 %
4
20 V @ 3 kHz
Reading 1
±
0.15 %
5
20 V @ 5 kHz
Reading 1
±
0.25 %
* Includes limit of errors:
1. 5220A 2. 5200A 3. Y5020 4. 931A
1. 5220A 2. 5200A 3. Y5020 4. 931A
4-27. Overcurrent Trip Test
The following procedure will verify the accuracy of the overcurrent trip setting on the
5220A:
5220A:
1.
Connect the load resistor (0.1 ohm) to the enabled (front/rear) output terminals.
2.
Set the output of the ac voltage calibrator to 20.0000 V rms.
3.
Set the 5220A to the operate mode.