Operator's Manual
DS7A - Constant Current Stimulator
Appendix 4 .. Recurrent Testing of the DS7A
Recurrent testing of medical electrical equipment is often required as part of the equipment management
policy of hospitals or other responsible organisation. These tests may be required before the equipment is
put into service, or after fixed time intervals.
The international standard, IEC 62353 (Recurrent test and test after repair of medical electrical equipment),
suggests testing intervals. For equipment that applies electrical energy, to directly influence the function of
nerves or muscles, as the DS7A can, the suggested test intervals should be no more than 24 months.
Every DS7A supplied is extensively tested by Digitimer before delivery.
These instructions are meant as a guide to suitably qualified test personnel, with authority to perform these
tests on behalf of the responsible organisation for the equipment involved. They provide guidance to allow
the tests to be accomplished without causing damage to the equipment or exposing the test personnel to
risk. They cannot and must not replace the training and experience required for testing medical electrical
equipment.
Test Procedure
Before commencing the test procedure it is important to fully understand the operation of the DS7A by
reading the Operator's Manual.
The DS7A is a Class 1 device with Type BF applied parts.
There is no requirement, in any of these tests, to open the case of the DS7A. All repair procedures should be
referred to Digitimer or a local distributor.
Visual Inspection
Visually check for any damage to the enclosure of the DS7A. Also carefully check for damage to the supply
lead and any input or output cables.
Check that the voltage selector on the rear panel is set to suit the local supply voltage.
Check that the 2 mains fuses, housed within the appliance coupler, are of the correct rating and type for the
local supply voltage.
Check for signs of contamination or fluid spill. If fluid has entered the enclosure refer the repair to Digitimer
or it’s local distributor.
Check that the tamper-evident seals on the rear of the DS7A are unbroken and un-disturbed. Evidence that
the enclosure has been opened may indicate the need for more extensive testing.
Digitimer Ltd.
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Last Revised: February 1, 2017
