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12 

 

ITEM

 

NAME

 

FUNCTION

 

VOLTAGE

 

Adjust Knob 

Adjust the digital voltage set point in the tester. 
Press the voltage knob to display the voltage set point. This setting will blink for a few seconds on the front meter. 
Turn Clockwise to increase the setting Voltage Setting Point before pressing 

CHARGE

 button. 

POLARITY

 

switch 

Toggles the output pulse polarity from Normal to Reverse, Normal for positive and Reverse for Negative, The pulse will appear on the Output jack relative 
to the return jack 
The polarity switch only operates when the 

CHARGE 

indicator is lit and the voltage on the display meter is less than 180V.   The polarity is Normal when 

the 

NOR

 indicator is lit and, Reverse when the 

REV

 indicator is lid.   

NOR REV 

indicator 

Indicates the state of the Output Polarity switch.  

NOR

 indicates Normal (Positive) position.  

REV

 indicates Reverse (Negative) position. 

CHARGE

 

switch 

Starts the charge process of the tester capacitor. 
The 

CHARGE

 indicator will turn off after the 

CHARGE

 switch is pressed, and the 

TRIGGER

 indicator will turn on. 

The charge process will stop after 2 minutes if the 

TRIGGER

 button is not pressed. 

CHARGE

 

indicator 

This Yellow indicator is lit to show that pressing the 

CHARGE

 switch is the next logical step in a test sequence. 

CHARGE

 indicator is lit when the tester is turn ON an after pressing 

TRIGGER

 button. 

CHARGE

 indicator will go out after pressing 

CHARGE

 button. 

CHARGE

 and 

TRIGGER

 Indicators will be blinking if the Interlock Switch is open. (Only testers with Interlock Switch Option) 

TRIGGER

 

switch 

Triggers the output impulse waveform. 
The impulse waveform will appear across the output leads. 

TRIGGER

 

indicator 

This Red indicator is lit to show that the tester can be trigger. 

TRIGGER

 indicator is lit for 2 minutes after the 

CHARGE

 button is pressed. 

TRIGGER

 indicator will go out after pressing 

TRIGGER

 button. 

TRIGGER

 and 

CHARGE

 Indicators will be blinking if the Interlock Switch is open (Only testers with Interlock Switch Option) 

TRIGGER

 indicator will blink at when the Voltage. This effect will remain on until the 

TRIGGER

 switch is pressed.  (Only testers with PC Interface 

option) 

VOLTAGE

 

meter 

Displays the output voltage set point. 
The voltage reading will increase from zero to the voltage set point when the CHARGE button is pressed. Note that the Voltage meter may indicate that 
some  residual  voltage  is  present  on  the  main  storage  capacitor,  even  when  the  tester is first turned ON. This is due to inherent charging of the internal 
capacitors. Pressing the 

TRIGGER

 switch will discharge the capacitors.  Note that the peak amplitude of the measured output waveform is proportional to 

the  voltage  that  is  read  of  the  front  panel  of  the  MegaPulse,  but  it  will  always  be  somewhat  lower.  This  is  because  the  meter  on  the  MegaPulse  is 
measuring the voltage on the main impulse storage capacitor. This voltage will intentionally dissipate to some extent before reaching the output leads.  

OUTPUT

 

jack 

The impulse waveform appears on the 

OUTPUT

 jack, referenced to the 

RETURN 

jack.  When the 

POLARITY

 switch is in the Normal position (

NOR

 

indicator is lit) the output will be a positive pulse.  When the 

POLARITY

 switch is in the Reverse position (

REV

 indicator is lit) the output will be a 

negative pulse. 

10 

 

RETURN

 

jack 

This is the return for the impulse waveform.  This jack is referenced to the chassis of the MegaPulse, and is referenced to earth ground as long as the 
MegaPulse is properly grounded.  Even though this jack is referenced to ground, it should be treated as hazardous whenever the MegaPulse is turned ON. 

11 

OUTPUT 

switch

 

Used to select the waveshaping network components that are specified for each nominal output voltage.  Refer to 

Table 1

 for additional details. (optional, 

just in case that multiple output was ordered) 

Table 2. Controls, Indicators, Connectors – MegaPulse 1.2x50-12.3PF-1 500ohm 0.5J  Front Panel 

Summary of Contents for MegaPulse 1.2x50-12.3PF-1

Page 1: ...MegaPulse IMPULSE TESTER 1 2x50 12 3PF 1 500ohm 0 5J Instruction Manual...

Page 2: ...design and ergonomic front panel and represents the latest in high voltage impulse testing To fully appreciate all the features of your new instrument we suggest that you take a few moments to review...

Page 3: ......

Page 4: ...ter 9 AC Line Voltage Requirements 9 Fuse Replacement 10 Front and Rear Panel Features 10 Setting the Peak Output Voltage 14 Initial Checkout Procedure 15 Testing 16 Technical Assistance 18 Maintenanc...

Page 5: ...1...

Page 6: ...are that high voltage is adept and creative at completing a path to ground Instructions should include a warning against any metal jewelry Operators should not allow others in the testing area especia...

Page 7: ...will stop after 2 minutes if the TRIGGER button is not pressed The MegaPulse tester is designed to bleed the high voltage away after the test has concluded In order to ensure that any voltage present...

Page 8: ...amplitude of the measured output waveform is proportional to the voltage that is read on the front panel of the MegaPulse but it will always be somewhat lower This is because the meter on the MegaPul...

Page 9: ...ed in the Error Reference source not found below and the component designations are shown in Figure 1 Figure 1 General Electrical diagram Output Waveform Voltage C1 R1 R2 C2 1000 Vp 0 5 J 1 2x50 us 10...

Page 10: ...e 1 as specified however the component values of R1 and C1 may be modified to account for secondary circuit effects in order to generate the specified output waveform which is described in Figure 3 as...

Page 11: ...to half value T2 are as specified in IEC 61180 1 shown in Figure 4 Figure 4 Waveform time measurements from IEC 61180 1 Recommended test voltages and tolerance on peak voltage are as specified in IEC...

Page 12: ...8 Figure 5 Test Voltages and Tolerance from IEC 60255 5...

Page 13: ...ase use the original shipping container If the original shipping container is not available be sure that adequate protection is provided to prevent damage during shipment We recommend that the instrum...

Page 14: ...ug the instrument from the source of supply 3 Remove the power inlet cord from the instrument 4 Using a small screwdriver pry open the fuse holder door 5 Replace the fuse with a new one of the correct...

Page 15: ...11 Figure 6 Controls Indicators Connectors MegaPulse 1 2x50 12 3PF 1 500ohm 0 5J Front Panel image for reference only...

Page 16: ...pressing TRIGGER button TRIGGER and CHARGE Indicators will be blinking if the Interlock Switch is open Only testers with Interlock Switch Option TRIGGER indicator will blink at when the Voltage This...

Page 17: ...h is used to turn the tester ON and OFF 2 RS 232 Interface Optional Allow the communication between the tester and computer interface a RS 232 to USB is available 3 Interlock Switch Optional Emergency...

Page 18: ...OT SET THE VOLTAGE ABOVE THE MAXIMUM VOLTAGE SETTING SPECIFIED IN Table 4 DOING SO MAY DAMAGE THE EQUIPMENT Output Switch Setting Desired Peak Output Voltage Vp 1 Output Voltage Setting Vs Maximum Vol...

Page 19: ...n Toggle the POLARITY switch if necessary so that the NOR indicator is lit 5 Note that the Voltage meter may indicate that some residual voltage is present on the main storage capacitor even when the...

Page 20: ...ster on 5 Note that the Voltage meter may indicate that some residual voltage is present on the main storage capacitor even when the tester is first turned ON This is due to inherent charging of the i...

Page 21: ...Note that the peak amplitude of the measured output waveform is proportional to the voltage that is read of the front panel of the MegaPulse but it will always be somewhat lower This is because the me...

Page 22: ...ce West USA is available Phone 800 748 6224 Hours 8 00 AM 4 00 PM Pacific Time Also available on our web site at www compwest com Contact Compliance West USA 650 Gateway Center Way Suite D San Diego C...

Page 23: ...will be corrected at no charge Mail the instrument post paid to the manufacturer Dated proof of purchase is required for all in warranty repairs The manufacturer is also available for calibration and...

Page 24: ...on procedure must be performed by qualified personnel for more information contact Compliance West USA Voltage Stop Disable Keyboard Enable by Keyboard If the MegaPulse 1 2x50 12 3PF 1 500ohm 0 5J tes...

Page 25: ...the order of 10 20ms This is because the COM contact moves at a finite speed over a large contact gap distance Therefore it is reasonable to expect that the power source that is charging the capacitor...

Page 26: ...current flowing which allows the arc to be maintained Figure A 1 shows a test circuit schematic Figure A 2 shows the ideal simulated output waveform and Figure A 3 shows the actual output highlightin...

Page 27: ...s a shorter time constant Rc R2 x C3 As soon as the arc is extinguished a high impedance exists again between the COM contact and the NO contact Therefore a voltage difference will again develop betwe...

Page 28: ...lation In fact the waveform definitions from IEC 60060 1 and other standards do not specify the wave shape after the voltage has decayed to below 50 of the peak value In practice these transients have...

Page 29: ...25 Figure A 5 Breakdown as the voltage is rising...

Page 30: ...26 Figure A 6 Dieletric breakdown immediately after Vpeak...

Page 31: ...27 Figure A 7 Dielectric breakdown after Vpeak delayed breakdown...

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