Keithley 6485/E Digital-Multimeter, DMM, 6485/E Datenbogen

The ranges for current measurements are listed in 

The full scale readings for every measurement range are 5% over range. For example, on the 
20A range, the maximum input current is ± 21A. Input values that exceed the maximum 
readings cause the overflow message (OVRFLOW) to be displayed. 

To select a range, press the desired manual RANGE key. The instrument changes one 
range per key-press. If the instrument displays the OVRFLOW 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. 

When using autorange, the instrument automatically goes to the most sensitive available 
range to measure the applied signal. Up-ranging occurs at 105% of range, while 
down-ranging occurs at the range value. The AUTO key toggles the instrument between 
manual ranging and autoranging. The AUTO annunciator turns on when autoranging is 
selected. To disable autoranging, press AUTO or a manual RANGE key. Pressing AUTO 
to disable autoranging leaves the instrument on the present range.

Every time an autorange occurs, a search for every available range of the selected function 
is performed. The time it takes to perform the search could slow down range change speed 
significantly. Setting upper and/or lower autorange limits can reduce search time. 

Search time for finding the correct amps range can be reduced by setting upper and/or 
lower autorange limits. To set upper and/or lower autorange limits, press CONFIG then 
either manual RANGE key (for UPPER or LOWER), then scroll through the available 
range limits using the RANGE keys. Press ENTER when the desired range is flashing. 

A

2nA

2A

2mA

20nA

20A

20mA

200nA

200A