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Hope Electronics Technology Manual
Edition
V1.0 28
Chapter 3 Basic Measurement
Before measurement, be sure to read this chapter.
3.1 Setting the Measurement Range
Select a measurement range. Automatic range selection (the auto range) is
also available.
Using the manual range
3mΩ > 30mΩ >300mΩ > 3Ω > 30Ω > 300Ω >3kΩ >30kΩ > 300kΩ > 3MΩ.
Using the auto range
Use the
[AUTO]
key to switch to the auto range. (The default setting is
AUTO.) When the instrument is in the auto range mode, AUTO is lit.
IMPORTANT
When the auto range is used or the measurement range is set to 30mO or
less, a maximum current of 1 A may constantly flow through the measurement
target, and a maximum power of approximately 2 W may be applied*.
If there are any of the following concerns, depending on the level of the
measurement current, select a range using a lower measurement current.
l The measurement target may melt (such as a fuse or inflator).
l
The measurement target may heat up, causing a change in resistance.
l
The measurement target may be magnetized, causing a change in
inductance.
Within each of the measurement ranges, the power for the measurement
target can be expressed by “resistance x (measurement current)
2
”. If the
measurement range is deviated, the power may reach the value of “open-circuit
voltage x measurement current” at maximum.
Before connecting the measurement target, be sure to check the
measurement range.
*
At the moment of connecting the measurement target, a maximum inrush
current of 5 A flows.
(Convergence time: Approximately 1 ms for pure resistance)