Fluke 1535 - Page 17

Insulation Tester
Calibration Procedure
13
4. To calibrate the PWM function, use the PC and serial communication software to enter these commands:
Command Operation / Purpose Response
Connect the high voltage meter between L and G
cal start_pwm Enter PWM calibration mode “cal start_pwm”
pwm 0 Set PWM ratio to 0 % “pwm adjusted”
Measure the L-G voltage by the high voltage
meter, the measured (in Volts) is V_READ
adc hv r Read the HV analog-to-digital conversion value ADC_READ “pwm_volt_adc”
cal_param pwm 0
0 V_READ ADC_READ
Write the calibration parameter 0, use measured
value V_READ and read value ADC_READ in the
previous two steps
“pwm param”
pwm 7.3 Set PWM ratio to 7.3 % “pwm adjusted”
Measure the L-G voltage by the high voltage
meter, the measured (in Volts) is V_READ
adc hv r Read the HV analog-to-digital conversion value ADC_READ “pwm_volt_adc”
cal_param pwm 1
7.3 V_READ ADC_READ
Write the calibration parameter 1, use measured
value V_READ and read value ADC_READ in the
previous two steps
“pwm param”
pwm 69.5 Set PWM ratio to 69.5 % “pwm adjusted”
Measure the L-G voltage by the high voltage
meter, the measured (in Volts) is V_READ
adc hv r Read the HV analog-to-digital conversion value ADC_READ “pwm_volt_adc”
cal_param pwm 2
69.5 V_READ ADC_READ
Write the calibration parameter 2, use measured
value V_READ and read value ADC_READ in the
previous two steps
“pwm param”
pwm 71.3 Set PWM ratio to 71.3 % “pwm adjusted”
Measure the L-G voltage by the high voltage
meter, the measured (in Volts) is V_READ
adc hv r Read the HV analog-to-digital conversion value ADC_READ “pwm_volt_adc”
cal_param pwm 3
71.3 V_READ ADC_READ
Write the calibration parameter 3, use measured
value V_READ and read value ADC_READ in the
previous two steps
“pwm param”
pwm 73.0 Set PWM ratio to 73.0 % “pwm adjusted”
Measure the L-G voltage by the high voltage
meter, the measured (in Volts) is V_READ
adc hv r Read the HV analog-to-digital conversion value ADC_READ “pwm_volt_adc”
cal_param pwm 4
73.0 V_READ ADC_READ
Write the calibration parameter 4, use measured
value V_READ and read value ADC_READ in the
previous two steps
“pwm param”
pwm 74.8 Set PWM ratio to 74.8 % “pwm adjusted”
Measure the L-G voltage by the high voltage
meter, the measured (in Volts) is V_READ
adc hv r Read the HV analog-to-digital conversion value ADC_READ “pwm_volt_adc”
cal_param pwm 5
74.8 V_READ ADC_READ
Write the calibration parameter 5, use measured
value V_READ and read value ADC_READ in the
previous two steps
“pwm param”
pwm 76.5 Set PWM ratio to 76.5 % “pwm adjusted”
Measure the L-G voltage by the high voltage
meter, the measured (in Volts) is V_READ