TOS93 Series User’s Manual 47
Basic Operation
Selecting the Test Mode
The TOS93 series has the following test modes. The tests that can be selected varies depending on the
model.
Tests supported by each model
Test mode Description
AC withstanding
voltage (ACW)
This test evaluates whether the electrical insulation section of an electric product or
component has enough dielectric strength for the voltage to be handled.
DC withstanding
voltage (DCW)
This test evaluates whether the electrical insulation section of an electric product or
component has enough dielectric strength for the voltage to be handled. This is
used when the EUT’s capacitive component is large and judging the dielectric
breakdown is difficult using ACW.
Insulation
resistance (IR)
This test evaluates whether the electrical insulation section of an electric product or
component has enough resistance for the voltage to be handled. There is a 7 200 V
test and a -1000 V test (-1000 V test only on the TOS9300).
Earth continuity (EC) This test evaluates the continuity of the protective connection of devices (Class I
devices) that are designed to ensure safety with basic insulation and protective
earth grounding. There is a DC test and an AC test.
Leakage current (LC) This test measures leakage current of parts that can be touched on a device and
evaluates the risk of electric shock. In leakage current test mode, measurements
can be made using the following three tests and meter modes.
Touch current
(TC)
This test measures the current that flows from the enclosure of devices not con-
nected to protective ground through a simulated human body network to the
ground. If the measurement does not exceed the value assumed to be harmful to
human bodies as defined in safety standards or the like, the product meets the elec-
tric shock prevention requirements.
Protective
conductor current
(PCC)
This test measures the current that flows through the protective conductor of
devices that are connected to protective ground. This test is also used to confirm
the EUT’s compatibility to power distribution systems.
Patient leakage
current
(Patient)
This test measures the current that flows from a wearable part of a medical instru-
ment through a simulated human body network to the ground. If the measurement
does not exceed the value assumed to be harmful to human bodies as defined in
safety standards or the like, the product meets the electric shock prevention
requirements.
Meter mode
(Meter)
Like typical multimeters, the current and voltage across the LEAKAGE CURRENT
A and B terminals on the front panel are measured and displayed. No judgment is
made based on reference values.
TOS9300 TOS9301 TOS9302 TOS9303 TOS9303LC
ACW
DCW
−
−
IR
−
EC
−−
LC
−−−−
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