People with heart pacemakers should not be in the vicinity of this system during operation.
4.3 Safety Features
Beside an Emergency Stop switch the MIDAS micro 2883 is equipped with an external Safety Switch (spring-
release type or a 'dead man' type). The Safety Switch should be controlled by the second test crew member (safety
observer). Without the Safety Switch the instrument cannot be activated.
Prior to making the first measurements, the Safety Switch operator should verify the correct operations of the
switch.
It is recommended that the Safety Switch be the last switch closed. It must remain open until all personnel are
safely in the clear. If unauthorized personnel should enter the area, or if some other undesirable situation should
develop, the Safety Switch operator should release the switch immediately, and then notify the MIDAS micro 2883
operator.
The Safety Switch should be used at all times. Never short circuit it and do not use
fixed mechanical locking devices for depressing the switch button. The switch
button must be manually operated at all times.
For visual warning of high voltage presence a warning bar is located in the screen of the instrument. Optional a
strobe light is delivered which can be mounted on the device under test.
The MIDAS micro 2883 is equipped with a HV GND connection surveillance. The high voltage can only be
switched on when the earth circuit is properly connected. The instrument indicates the status by software.
A separate green/yellow earth cable is provided for the purpose of safety grounding the instrument. The earth
cable should be connected to the Earthing Screw on the front panel of the MIDAS micro 2883 at one end and to
the station grounding system at the other end.
The green - yellow safety ground cable should be the FIRST lead to be connected to
the set.
4.4 Safety Precautions
All tests must be performed with the device under test completely de-energized and isolated from its power
systems. The equipment, its tank or housing must be disconnected from all buses and properly earthed, so that all
induced voltages or trapped charges are neutralized. Only when the measurement procedure is actually being
performed the grounds should be temporarily removed if necessary.
The MIDAS micro 2883 must be solidly earthed with the same ground as the device under test. When the
instrument is permanently housed in a vehicle, the MIDAS micro 2883 ground should be bounded to the vehicle
chassis, which in turn is grounded.
Exposed terminals of equipment should not normally be allowed to 'float'. They should be grounded directly or
through the low voltage leads “Input V (Guard)” of the MIDAS micro 2883, unless otherwise specified.
Testing of high voltage equipment involves energizing the equipment through the MIDAS micro 2883. This can
produce dangerous levels of voltage and current. Care must be taken to avoid contact with the equipment being
tested, its associated bushings and conductors, and with the MIDAS micro 2883 cables. Especially the high voltage
test cable should not be held during energization of the instrument. Flashover of the test specimen or the MIDAS
micro 2883 can generate transient voltages of sufficient magnitude to puncture the insulating jacket of the high
voltage test cable.
It is strongly recommended that the test crew make a visual check to ensure that the equipment terminals are
isolated from the power system. If there is real possibility that the device under test fails precautions such as
barriers or entrance restrictions must be taken against harm in the event of violent failure.
Proper clearance between the test equipment and the device under test must be ensured during the presence of
high voltage. Barriers and safety tapes can be established around the test area to prevent unintentional entry into
the live area. It must also be guaranteed that extraneous objects like ladders, buckets, etc. cannot enter the test
area.
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