Series 2280 Precision DC Power Supply Reference Manual Section 2: General operation
077085503 / March 2019 2-77
Using autoranging for current measurements
When measurement autoranging is selected, the instrument automatically selects the best range to
measure the signal. If the measurement reaches 120 percent of the present range (except for the
10 A range), the instrument changes the measurement range to the next higher range. If the
measurement reaches 80 percent to 90 percent of the next lower range, the instrument changes the
range to the next lower range.
If you enable measurement autoranging, the measurement range is changed when a measurement is
made.
To read the measurement range that the instrument chose, you must query the range after a
measurement is made.
You must set the measurement function before the measurement range can be set.
If you set the measurement range manually for a function, measurement autoranging is automatically
turned off for that function and remains off until you enable it again.
To select measurement autoranging using the front-panel home screen:
1. Press the HOME key.
2. Press the soft key under Range. The Range dialog box is displayed.
3. Select AUTO. The home screen is displayed with autoranging enabled.
To select measurement autoranging using the front-panel Measure Settings screen:
1. Press the MENU key.
2. Under Measure, select Settings.
3. Select the button next to Range. The Range dialog box is displayed.
4. Select AUTO.
You can set specific measurement ranges or allow the instrument to choose the ranges
automatically.
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