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Model 2790 SourceMeter
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High energy circuit safety precautions
To optimize safety when measuring voltage in high energy distribution circuits, read and
use the directions in the following warning.
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When making measurements in high energy circuits, use test leads that meet the following
requirements:
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Use the following sequence when testing power circuits:
1.
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Switch System Reference Manual
The 7702 module is safe to use with the 500V source of the 7751/7753 module.
The V-source is energy limited and classified as a non-hazardous source per
EN61010.
Dangerous arcs of an explosive nature in a high energy circuit can
cause severe personal injury or death. If the multimeter is connected to
a high energy circuit when set to a current range or low resistance
range, the circuit is virtually shorted. Dangerous arcing can result even
when the multimeter is set to a voltage range if the minimum voltage
spacing is reduced in the external connections.
As described in the International Electrotechnical Commission (IEC)
Standard IEC 664, the Model 2790 is Installation Category I and signal
lines must not be directly connected to AC mains.
Test leads should be fully insulated.
Only use test leads that can be connected to the circuit (e.g., alligator clips, spade
lugs, etc.) for hands-off measurements.
Do not use test leads that decrease voltage spacing. These diminish arc protection
and create a hazardous condition.
For the front panel inputs, the maximum common-mode voltage (volt-
age between INPUT LO and the chassis ground) is 500V peak. For a
7702 module, the maximum common mode voltage is 300V. Exceeding
these values may cause a breakdown in insulation, creating a shock
hazard.
The 7702 module is safe to use with the 500V source of the 7751/7753 module.
The V-source is energy limited and classified as a non-hazardous source per
ENG1010.
De-energize the circuit using the regular installed connect-disconnect device, for
example, by removing the device's power cord or by turning off the power switch.
3-3
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