6-2
- a decade resistor box (or equivalent device), 0-10 K Ω range, 1 Ω resolution;
- 2 4½ digits multimeters suitable for voltage, current and resistance measurements and such to guarantee the
following accuracy levels: Voltage: 1 mV / Current: 4 µA / Resistance: 1 Ω .
When instrument with a lower accuracy level would be used you should subtract the instruments error from the
measured value before assuming that it exceeds the specified limit.
Always refer to section 5. to properly perform the required connections for the model and channel you wish to
check. Be sure to respect specified polarity, both for voltage (+ or -) and for current (sink or source). Please
remember that in the following "input" is always referred to the isolator unit and not to the PLC or DCS device.
Warning: when dealing with mains powered units, be sure to take all required safety precautions.
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