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Safety Precautions
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This high voltage probe must only be used by personnel who are trained, experienced, or otherwise
qualified to recognize hazardous situations and who are trained in the safety precautions that are
necessary to avoid possible injury when using such a device.
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Do not work alone when working with high voltage circuits
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For your own safety, inspect the probes for cracks and frayed or broken leads before each use. If
defects are noted, DO NOT use the probe.
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Hands, shoes, floor and work bench must be dry. Avoid making measurements under humid, damp
or other environmental conditions that might effect the safety of the measurement situation.
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It is advisable to turn the high voltage source off before connecting or disconnecting the probe.
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The probe body should be kept clean and free of any conductive contamination. Refer to the section
on cleaning.
Operation
1 Connect the probe to the BNC input of the oscilloscope.
2 Select the desired volts/division range. (If you can set probe attenuation on the oscilloscope, set it to
1000:1)
3 Whenever possible, turn the high voltage source off before making any connections.
4 Connect the divider probe ground lead (alligator clip) to a good earth ground or reliable chassis
ground.
5 Before turning on the high voltage source, make sure that no part of the person holding the probe is
touching the device under test. Once this is certain, turn on the high voltage source.
6 Measure the voltage under test and observe the waveform on the oscilloscope. Remember the
actual voltage is 1000 times greater than the oscilloscope waveform if the probe attenuation has not
been set to 1000:1.
7 Turn off the high voltage source
8 Disconnect the High Voltage Probe from the high voltage source BEFORE disconnecting the ground
clip lead.
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Warning
Do not exceed 60 seconds of contact between the probe and circuit-under-test when
measuring voltages >8 kV (DC), >5 kV (AC, rms), or >20 kV (AC, peak). We recommend that
an interval of 10 minutes be taken between measurements.
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Do not attempt to take measurements from sources where the chassis or return lead is not grounded
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The ground lead is critical to the safe operation of the probe. Failure to make this connection when
making high voltage measurements may result in personal injury or damage to the probe or
oscilloscope. This connection must always be made BEFORE the probe tip comes in contact with
the high voltage and must not be removed until the probe tip has been removed from the high
voltage source.
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Do not connect the ground clip lead to the high voltage source for any reason.
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Do not make any floating measurements with the Testec High Voltage probe.
Cleaning
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Clean only the exterior probe body and cables. Use a soft cotton cloth lightly moistened with a mild
solution of detergent and water. Do not allow any portion of the probe to be submerged at any time.
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Dry the probe thoroughly before attempting to make voltage measurements.
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Do not subject the probe to solvents or solvent fumes as these can cause deterioration of the probe
body and cables.
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