18
Energy Measurement
Many medical equipment standards require energy measurements to be taken during surge testing. The D5-PF allows
calculation of these measurements in two different ways; by using the automatic energy measurement system included
in the tester or by connecting an external high voltage acquisition system to capture the pulse using the rear panel
receptacles and manually calculating the energy using the formula shown in Figure 8.
Figure 8. Formula to Calculate Energy
Where:
“s” is the voltage pulse captured with a high voltage acquisition system *.
“dt” is the difference on time between samples of the acquisition system.
“T” is the total duration of the pulse.
“R” is the resistance value where the pulse is applied **.
“E” is the energy in joules.
* The high voltage acquisition system can be a 1000:1 oscilloscope probe connected to a digital oscilloscope capable
of executing advanced mathematical functions. The oscilloscope would then be used to calculate the energy by
calculating the area under the curve.
** The D5-PF has been designed with a resistor value R of 100Ω ±1%, which will result in a value between 99 and
101 Ω. We recommend using a value of 100 Ω during energy calculations as a good approximation of the value for
“R” over the test period.
Energy Measurement using System Included on D5-PF
The MegaPulse D5-PF tester is equipped with an internal high voltage pulse acquisition system connected directly to
the internal 100 ohm resistor. This system automatically calculates the energy for each single pulse delivered.
Note 1:
To calculate the energy, this automated measurement system uses the mathematical formula showed on figure
8, where R = 100
.
Note 2:
This automatic option only operates when the D5-PF tester has the following settings:
AUX OUTPUT switch is in the RETURN position
S3 switch is in the OPEN position
INDUCTOR switch is for 25mH
Voltage Set point adjusted between 3500V - 5000V
To perform the automatic energy measurement follows the next steps:
1.
Select the desired polarity.
2.
Charge and Trigger the D5-PF between 3500V - 5000V
3.
Press the Energy Measurement Button. The front display will blink for a few seconds showing the energy
measurement in joules from the last pulse. If the display shows the word “none”, it means the last pulse was
not captured.
Criteria to validate the energy results:
Summary of Contents for MegaPulse D5-PF
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Page 5: ...iii Cleaning 26 Calibration Information 26 Technical Assistance 27...
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Page 16: ...10 Figure 2 Controls Indicators Connectors MegaPulse D5 PF Rear Panel...
Page 23: ...17 Figure 7 Y1 Y2 Test Output...
