DS5 Isolated Bipolar Constant Current Stimulator DS5 Operator's Manual 5.0
277 Electrical Medical Safety Analyser.
Earth Resistance - Accessible conductive parts are required to show a low impedance connection to
protective earth. The DS5 may be tested at currents up to 25A but the only accessible conductive parts are
the Potential Equalisation Terminal on the rear panel and the shell of the BNC connectors.
The visible shell of the USB connector MUST NOT be tested at 25A as damage will occur. The existence of
earth continuity here may be tested only at 100mA.
Leakage Currents - Connect the DS5 to the test equipment according to the instructions for a Class 1
device with Type BF applied parts. The applied parts of the DS5 are the red and black output terminals on
the front panel. As they are Type BF they may be tested as one part.
Leakage current measurements should be taken with the unit switched on and the output enabled.
All of the leakage current measurements, in both normal condition and single fault condition, may be taken
with the DS5 connected as described.
Insulation Resistance - Insulation resistance may be measured using test voltages of up to 350V.
Functional Test
The DS5 completes a full self test every time that it is powered-up. Should it be felt necessary to conduct
further tests, then the output should be loaded with a 11W 1k
W
resistor. An input signal suitable for the
DS5 input settings should be applied and the output monitored across the load resistance.
CAUTION: The DS5 can generate output voltages of up to 160V; care should be taken to insulate all
connections and avoid coming into contact with the output voltages. Special care should be taken to avoid
contact with both output terminals simultaneously.
Evaluation, Documentation and Preparation for Normal Use
The test results obtained should be analysed for possible non-conformance to standards and the results
recorded in line with the policy of the responsible organisation involved. Should the records show a
deterioration in test results the frequency of testing may need to be revised.
Assuming satisfactory test completion the DS5 may be returned to normal use. Check that the supply
voltage selector and the supply fuses are correct for the intended site of operation.
Digitimer Ltd. 36 of 52 Copyright © 2009
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