Range - Keithley 2182 User Manual

Range

The selected range affects both accuracy of the voltage measurement as well as the maximum
voltage that can be measured. The DCV1 function has five measurement ranges; 10mV, 100mV,
1V, 10V, and 100V. The DCV2 function has three measurement ranges; 100mV, 1V, and 10V.
The range setting (fixed or AUTO) is remembered by each voltage function.
NOTE
There is no range selection for temperature (TEMP1 and TEMP2) measurements.
Temperature measurements are performed on a single, fixed range. The DIGITS key sets reading
resolution.
Maximum readings
The full scale readings for every voltage range are 20% over range. For example, on the 10V
range, the maximum input voltage is ±12V.
Depending on which type of thermocouple is being used, the maximum temperature readings
range from –200˚C to 1820˚C. The Specifications
thermocouple type.
Input values that exceed the maximum readings cause the overflow message ("OVRFLW")
to be displayed.
Manual ranging
To select a range, press the RANGE
key-press. The selected range is displayed for one second. Note that the manual range keys have
no effect on temperature (TEMP1 and TEMP2).
If the instrument displays the "OVRFLW" 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.
The available voltage ranges for Ratio (V1/V2) depend on which channel is presently
selected when Ratio is enabled. If Channel 1 is presently selected, DCV1 ranges will
be available when Ratio is enabled. If Channel 2 is presently selected, DCV2 ranges
will be available when Ratio is enabled. Complete information on ranging for Ratio
is provided in Section 5.
Range, Digits, Rate, and Filter
(Appendix A) list the reading range for each
or key. The instrument changes one range per
3-3