(2) External meter, volts. Refer to figures 2-4 and 2-5. Set the mode switch to
EXT METER, VOLTS. Connect a Kelvin cable to the red jacks on the rear panel or a
single test lead to the red EXT jack and the other cable to the black jacks. A voltage of up
to 500 can now be measured between the cables. The input impedance is 1mOhm, and
the AAMI load is connected.
(3) External meter, a/mv. Refer to figures 2-4 and 2-5. Set the mode
switch to EXT METER, A/mv. Connect a Kelvin cable to the red jacks on the rear
panel or a single test lead to the red EXT jack and the other cable to the black jacks or
black EXT. A current of up to 2000a or a voltage up to 2000mv can now be measured
between the cables. The AAMI load is connected which may load down voltage
measurements where the impedance of the voltage source is high.
(4) External meter, mOhms. Refer to figure 2-5. Set the mode switch to EXT
METER, mOHMS. In this mode, the current source and measurement circuits are both
connected to the rear panel jacks. Connect one Kelvin cable to the red jacks and the other
cable to the black jacks. Connect the resistance to be measured between the alligator
clips. Be sure the current source active lamp lights up when the connections are made.
This is a four terminal technique used to accurately measure low value resistances such
as less than 2. This is also the only measurement requiring two Kelvin cables.
f. Power Down. At the completion of the tests, perform the following steps:
Turn off the UUT.
Turn off the safety analyzer.
Set the polarity switch to OFF.
Disconnect the UUT from the test receptacle.
Unplug the safety analyzer.
When not in use, store the safety analyzer in the storage case provided.
If the UUT fails any safety test, document the measurements on the appropriate
form. Ensure that the equipment is tagged and turned in for repair according to
your shop's standing operating procedures (SOP).
In addition to the tests above, include the following three tests when you check the
You do not perform external tests on the ECG.