Guarding And Shielding - Keithley 2601B Reference Manual

Series 2600B System SourceMeter® Instrument Reference Manual
The figure below illustrates the connection scheme of two Model 2602B channels connected in
parallel. Two Model 2602B channels can output up to 20 A at 36 V (see
page 2-59)). The current delivered to the DUT is the sum of currents output by SMU channels (I
Combining the two Series 2600B instrument channels expands the power envelope. For further
information, visit the
combining two Series 2600B instrument channels.
I Single SMU maximum pulse current: 10 A
1
I Single SMU maximum pulse current: 10 A
2
I Paralleled SMU channels maximum pulse current (as shown): 20 A
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Guarding and shielding

You can optimize source-measure performance and safety with the effective use of guarding and
shielding (noise and safety shields).
Safety shield
A safety shield must be used whenever hazardous voltages (>30 V RMS, 42 V peak) will be
present in the test circuit. To prevent electrical shock that could cause injury or death,
never use the Series 2600B in a test circuit that may contain hazardous voltages without a
properly installed and configured safety shield.
The safety shield can be metallic or nonconductive, and must completely surround the DUT test
circuit. A metal safety shield must be connected to a known protective earth (safety ground). See
fixture (on page 2-72) for important safety information on the use of a metal or a nonconductive
enclosure.
2600BS-901-01 Rev. B / May 2013
Keithley Instruments website
Figure 27: Connecting channels in parallel for higher current
Combining SMU outputs
(http://www.keithley.com) for application notes on
Section 2: General operation
(on
).
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Test
2-63