Digital Multimeter HDM3055 Series Manual

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When you change any of these settings, the sample interval (sample timer in continuous mode) is

increased to be greater than the calculated measurement time. In the continuous mode, attempting

to reduce the sample interval below the calculated value results in an error message. You must then

choose among the various ways you can achieve a smaller measurement time to achieve the smaller

sample interval, such as decreasing the NPLC setting.

Another way to put it is that for continuous mode, sample timer/interval is always controlled by the other

measurement settings.

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Service and Repair

This section contains basic instrument service information.

Cleaning

To prevent electrical shock, disconnect the instrument from AC mains power and disconnect all test

leads before cleaning. Clean the outside of the instrument using a soft, lint-free, cloth slightly dampened

with water.

Do not use detergent or solvents.

Do not attempt to clean internally.

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Electrostatic Discharge (ESD) Precautions

Almost all electrical components can be damaged by electrostatic discharge (ESD) during handling.

Component damage can occur at electrostatic discharge voltages as low as 50 V.

The following guidelines will help prevent ESD damage during service operations:

l Disassemble instruments only in a static-free work area.

l Use a conductive work area to reduce static charges.

l Use a conductive wrist strap to reduce static charge accumulation.

l Minimize handling.

l Keep replacement parts in original static-free packaging.

l Remove all plastic, foam, vinyl, paper, and other static-generating materials from the immediate work

area.