4-6
IM 253421-01E
Explanation
Manual Range (fixed) versus Automatic Range (auto)
The measurement range can be of one of the following types. The initial setting is
Auto range ON.
• Manual range
Voltage range: Select from 600 V, 300 V, 150 V, 60 V, 30 V, and 15 V.
Current range: Select from 20 A, 10 A, 5 A, 2 A, 1 A, 0.5 A, 200 mA, 100 mA, 50
mA, 20 mA, 10 mA, and 5 mA.
• Auto range: Auto
The measuring range is adjusted automatically according to the input voltage or
current as follows. Overrange is handled the same way as for the manually
selected range.
Range up:
A higher range is selected immediately if the instantaneous input voltage or
current exceeds approx. 300% of the rated value during sampling. If the
meaured voltage or current exceeds 110% of the rated value, a higher range will
be selected at the end of the current measurement cycle.
Range down:
A lower range is selected if the measured voltage or current drops below 30% of
the rated value. However, even when the measured voltage or current drops
below 30% of the rated value, range down will not be done when this would
result in waveforms with a high crest factor causing peak over.
Verifying the Range
To verify the current range setting press the V RANGE key or the A RANGE key. The
result will be shown at display C. In order to return to the measurement status, press
the same key again.
Note
•
When the range is set to auto, you cannot move to the minimum range by pressing the
∧
key.
On the other hand, when the range is set to the minimum, you cannot move to auto range by
pressing the
∨
key.
•
When the range is set to auto, the range may be adjusted frequently if a waveform such as a
pulse is input. In such a case, set the range manually.
4.4 Selecting the Measurement Range in case of Direct Input
