Keithley 2000, User Manual, Page: 57 / 280

Measurement configuration
The following paragraphs discuss configuring the multimeter for making measurements. See
the end of Appendix A for information about optimizing readings for speed or accuracy.
Range
The selected measurement range affects both the ultimate digits and accuracy of the measure-
ments as well as the maximum signal that can be measured. The range setting (fixed or auto) for
each measurement function is saved when changing functions.
Maximum readings
The full scale readings for every range on each function are 20% overrange except for the
1000VDC, 750VAC, 3ADC, 3AAC, and diode test ranges.
Input values more than the maximum readings cause the "OVERFLOW" messages to be dis-
played.
Manual ranging
To select a range, simply press the RANGE
▲
or
▼
key. The instrument changes one range
per keypress. The selected range is displayed for one second.
If the instrument displays the "OVERFLOW" message on a particular range, select a higher
range until an on-range reading is displayed. Use the lowest range possible without causing an
overflow to ensure best accuracy and resolution.
Note that the temperature and continuity functions have just one range.
Autoranging
To enable autoranging, press the AUTO key. The AUTO annunciator turns on when autorang-
ing is selected. While autoranging is selected, the instrument automatically chooses the best
range to measure the applied signal. Autoranging should not be used when optimum speed is
required.
Note that up-ranging occurs at 120% of range, while down-ranging occurs at 10% of nominal
range.
To cancel autoranging, press AUTO or the RANGE
▲
or
▼
key. Pressing AUTO to cancel
autoranging leaves the instrument on the present range.
The AUTO key has no effect on the temperature, continuity, and diode test functions.
Measurement Options 3-3