System SourceMeter® Instrument Reference Manual Section 2:
2600BS-901-01 Rev. B / May 2013 2-63
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 Combining SMU outputs (on
page 2-59)). The current delivered to the DUT is the sum of currents output by SMU channels (I
T
).
Combining the two Series 2600B instrument channels expands the power envelope. For further
information, visit the Keithley Instruments website
(http://www.keithley.com) for application notes on
combining two Series 2600B instrument channels.
Figure 27: Connecting channels in parallel for higher current
I
1
Single SMU maximum pulse current: 10 A
I
2
Single SMU maximum pulse current: 10 A
I
T
Paralleled SMU channels maximum pulse current (as shown): 20 A
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 Test
fixture (on page 2-72) for important safety information on the use of a metal or a nonconductive
enclosure.
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