Keithley 2450 User Manual

Section
2: General operation Model 2450 Interactive SourceMeter® Instrument
Reference Manual
2-104 2450-901-01 Rev. B/September 2013
Measurement range
The measurement range determines the full-scale input for the measurement. The measurement
range also affects the accuracy of the measurements and the maximum signal that can be measured.
A change to the measurement range can cause a change to the related current or voltage limit. When
this occurs, an event message is generated.
The total range is 22 W; no combination of voltage and current ranges can exceed 22 W. For
example, with 200 V source range, the highest current measurement range is 100 mA
(200 V * 100 mA = 20 W).
Whether or not you can select a measurement range is affected by other settings on the instrument.
You can only select a measurement range if you are sourcing one type of measurement and
measuring another. For example, you can select a measurement range if you are sourcing voltage
and measuring current. However, if you are sourcing voltage and measuring voltage, the
measurement range is the same as the source range and cannot be changed.
You can only select a measurement range for ohms if you are using the instrument as an ohmmeter
(sourcing current and measuring resistance).
Maximum limits for Model 2450
Measure range Maximum source limit
20 mV
±21 mV
200 mV
±210 mV
2 V
±212 mV
20 V
±2.1 V
200 V
±21 V
10 nA
±10.5 nA
100 nA
±10.6 nA
1 µA
±1.05 µA
10 µA
±1.06 µA
100 µA
±10.6 µA
1 mA
±106 µA
10 mA
±1.06 mA
100 mA
±10.6 mA
1 A
±106 mA
Selecting a specific measurement range
You need to set the measurement function before you can set the measurement range.
When selecting a measurement range, to ensure the best accuracy and resolution, use the lowest
range possible that does not cause an overflow error.
If you set the measurement range to a specific value, the setting for automatic measurement range is
set to disabled.

Keithley 2450 Specifications

General

Brand	Keithley
Model	2450
Category	Test Equipment
Language	English