TOS93 Series User’s Manual 321
Appendix
Stray Capacitance of AC Withstanding Voltage Tests
During AC withstanding voltage tests, current also flows in the stray capacitance of items such as the test
leads and tools. The following table shows a summary of the current running through the stray capacitance
due to the output voltage.
Particularly when performing high-sensitivity, high-accuracy measurement or when using the optional high
voltage scanner (p.330), the effects of current running through the stray capacitance must be removed by
referring to the following methods.
• If you set the grounding mode (GND) to low, add the current running through the stray capacitance to
the upper and lower limits, or use the offset function.
• Set the grounding mode (GND) to Guard.
Measurement environment Output voltage
1 kV 2 kV 3 kV 4 kV 5 kV
When a lead wire 350 mm long is hung in air (typical value) 2 μA 4 μA 6 μA 8 μA 10 μA
When the supplied lead wire TL31-TOS is used (typical value) 16 μA 32 μA 48 μA 64 μA 80 μA
Per high voltage scanner (typical value, excluding the test lead) 22 μA 44 μA 66 μA 88 μA 110 μA
WARNING
• If there is a possibility that the EUT or tools and the like will be grounded or if you
are uncertain, do not set GND to Guard. Doing so is extremely dangerous because
the ammeter will be shorted and will not be able to measure current.
• If you set GND to Guard, do not connect measuring instruments that are grounded
at one end (e.g., Kikusui 149-10A High Voltage Digital Voltmeter, TOS120
0 Current
Calibrator) to this product. Doing so is extremely dangerous because the ammeter
will be shorted and will not be able to measure current.
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