c. Types of Equipment Safety Tests. Additionally, the Model 232, when
connected to the specified power source and ECG, is capable of making the following
measurements by activating the appropriate switches and without changing terminal
(1) Line voltage of the alternating current (ac) power line at the test receptacle
three ways: neutral to hot, neutral to ground, and hot to ground.
(2) Leakage current from the chassis of an ECG to ground; from each patient
electrode individually to ground; and from all patient electrodes in common to ground with
the electrical power supply to the ECG normal and reversed, and grounded and
(3) Leakage current between the right arm and left arm; right arm and right
leg; and between left arm and right leg.
(4) Leakage current through all patient electrodes in common to ground when
applied by a 120/230 volts (v) alternating current (vac) power supply internal to the tester.
(5) Ground resistance test for portable equipment having a power cord.
Measurements are made of the ground resistance between the chassis of the equipment
and the ground pin. This test verifies that the unit under test (UUT) is properly grounded.
Ground resistance test for hard-wired equipment.
Case leakage current test for portable equipment.
Case leakage current test for electrocardiographs.
a. Meter. The safety analyzer displays measurements on a 3 1/2 digit light
emitting diode (led) display. Overrange is indicated by a flashing 1999. The appropriate
range is selected automatically with the units of measure shown on the mode switch.
During resistance measurements, a separate led illuminates when the current source has
b. Current. There are two current ranges: 0-199.9 microamperes (a) and
0-1999a. Measurements are made through an AAMI load. Accuracy is one percent of
full scale. Measurements are root-mean-square (rms) and can be ac plus direct current
(dc). With the DC ONLY switch depressed, only the dc component of the signal is