Tektronix KEITHLEY SourceMeter 2606B Reference Manual page 216

In this section:
Source-measure concepts ....................................................... 8-1
Analog-to-digital converter ..................................................... 8-14
Measurement settling time considerations ............................. 8-15
Effects of load on current source settling time........................ 8-16
Creating pulses with the 2606B SMU ..................................... 8-17
Source-measure concepts
This section provides detailed information about source-measure concepts, including:
•
Limit principles
•
Overheating protection
•
Operating boundaries
•
Basic circuit configurations
•
Guard
Limit principles
A limit acts as a clamp. If the output reaches the limit value, the 2606B attempts to prevent the output
from exceeding that value. This action switches the source from a voltage source to a current source
(or from a current source to a voltage source) when a limit is reached.
As an example, assume the following:
•
2606B instrument: V
•
Device-under-test (DUT) resistance: 10 Ω
With a source voltage of 10 V and a DUT resistance of 10 Ω, the current through the DUT should be
10 V / 10 Ω = 1 A. However, because the limit is set to 10 mA, the current does not exceed that value,
and the voltage across the resistance is limited to 100 mV. In effect, the 10 V voltage source is
transformed into a 10 mA current source.
The 2606B SMU output does not exceed the compliance limit, except for the compliance limit
conditions described in
(on page 8-1)
(on page 8-2)
(on page 8-3)
(on page 5-5)
(on page 8-12)
= 10 V; I
SRC
Source-measure capabilities
= 10 mA
LIMIT
(on page 5-2).
Section 8
Theory of operation