Compliance West MegaPulse 2x10s-2.5, Instruction Manual

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result in repeatability problems during the test
setup. We recommend using the 50 ohm resistor
at first, until the operator is familiar with the
MegaPulse operation; at which time he may wish
to experiment with other resistances as setpoints.
1.
Remove power to the MegaPulse and turn
the Voltage Control to zero. Turn the
Sensitivity Control to the maximum setting,
i.e. the knob pointer at 5 o’clock.
2. Using the supplied High Voltage Test leads,
connect the test resistor across the High
Voltage outputs of the MegaPulse.
3. Energize the MegaPulse and press the
Charge Button. Use the Voltage Control to
set the output to the desired level as shown
on the MegaPulse voltage meter.
4. Press the TRIGGER button. The green
PASS light should illuminate.
5. Retest, turning the Sensitivity Control to a
progressively lower setting, until the red
FAIL light lights. In general, the pointer on
the knob will be at approximately 2 o,clock
for 10-12kV and approximately 8 o’clock
for 1-2kV test voltages.
6. If the output voltage of the MegaPulse is
changed, the Sensitivity Control should be
reset.
Defib-5 Checkout and Operation
The Defib-5 Medical Defibrillation tester
consists of two parts; the pulse generation
portion and the measurement portion. Please
refer to the boxes shown in Fig. D-1, which is
IEC 601-1, Figure 50 edited to show the function
of the Defib-5. The lower box shows the part of
the Defib-5 which generates the pulse, while the
upper box shows the measurement network. The
rest of Fig. D-1 is the EUT.
Use of Measurement Terminals Y1
and Y2
There are two BNC jacks on the front panel of
the Defib-5, labeled Y1 and Y2. These are used
to verify that the Applied Part or Chassis of the
Equipment Under Test does not exceed 1 Volt
peak in accordance with IEC/EN/UL 60601-1. A
marginally failing product will cause the voltage
on the oscilloscope to rise to 1 Volt (ref. 60101-
1 clause 17h) . Note that this voltage does not
have the same waveshape as the defibrillation
pulse. The measurement point has a voltage rise
time constant of 2 mSec (derived empirically).
The decay time of the measurement point is
driven by the impedance of the oscilloscope,
which is typically 1 MegOhm. In this case, the
decay time would have a time constant of 1
second.
Verification of Measurement
Circuit Operation
To verify proper oscilloscope setup and to
ensure that you can capture a waveform, set up
the time base of the oscilloscope to
100mS/division. Connect the Defib-5's Y1 and
Y2 jacks to the Ch1 and Ch2 inputs respectively
of an oscilloscope using appropriate BNC
cables. Set up the oscilloscope to perform a
(Ch1 - Ch2) math function. (Depending on the
particular oscilloscope used, it will be necessary
to experiment with the trigger setting in order to
ensure that you will be able to capture the
signal.)
Connect the Measuring Point input jack on the
front panel of the Defib-5 directly to the Output
jack on the front panel of the Defib-5 using the
lead supplied with the tester. Set the output of
the Defib-5 to minimum using the Voltage
Knob. Press the CHARGE button, and adjust
the Voltage output so that the front panel meter
reads 100 volts (note that this is much lower than
the standard test voltage of 5000 volts). Press
the TRIGGER button and verify that the voltage
captured by the oscilloscope rises to approx. 2.5
volts. Refer to Figure D-2 which shows what
the signal should look like. This will show that
the voltage divider network of the Defib-5 which
is connected to the Y1 and Y2 jacks is
functioning as intended.
Testing with the Defib-5
To perform actual testing, the Defib-5 is
connected to the EUT as shown in the attached
drawing. Note the actual connections on the
front panel of the Defib-5 have been added to
Figure 50 of IEC 601 for illustrative purposes as
shown in Figure D-1 of this manual.