Keithley 2651A Reference Manual

Model 2651A High Power System SourceMeter® Instrument Reference Manual Section 4: Theory of operation
2651A-901-01 Rev. A / March 2011 4-21
Use following table to determine the affect of various DUT impedances on the gain-bandwidth when
the SMU is operating on each current source range. If the ratio of DUT impedance to current source
feedback impedance increases above the indicated 60 kHz ratio, then the settling time will increase
beyond the specified times. This means that there is a maximum DUT impedance for each current
source range. The settling time on a current source range can increase significantly when measuring
DUTs that have an impedance that is higher than that listed in this table.
Current source gain-bandwidth
Range SMU feedback
impedance
60 kHz ratio
(DUT / SMU impedance)
Maximum DUT
impedance
100 nA
33 MΩ
0.5
33 MΩ
1 μA 396 kΩ
0.5
1.2 MΩ
10 μA 396 kΩ
0.5
396 kΩ
100 μA 3687 Ω
0.5
11 kΩ
1 mA
3687 Ω
0.5
3687 kΩ
10 mA
27 Ω
0.5
81 Ω
100 mA
27 Ω
0.5
27 Ω
1 A
0.045 Ω
0.5
1.1 Ω
5 A
0.045 Ω
0.5
0.23 Ω
10 A
0.005 Ω
0.5
0.065 Ω
20 A
0.005 Ω
0.5
0.065 Ω
50 A
0.005 Ω
0.5
0.065 Ω
Pulse rise times
The pulse rise time is the leading edge interval for the pulse to go from 10% of maximum value to
90% of maximum value. Pulse fall time is similar but on the trailing edge. For the Model 2651A, pulse
rise and fall times can vary depending on the following factors:
• Cable specifications and connection configuration
• Range and setting
• Load and operating mode
• Compliance configuration
Refer to the Model 2651A specifications for details on transient response times, pulse rise times, and
source settling times. For latest specifications, go to the Keithley Instruments website
(http://www.keithley.com).

Keithley 2651A Specifications

General

Brand	Keithley
Model	2651A
Category	Measuring Instruments
Language	English