Keithley 7035, Инструкция по эксплуатации

Страница: 20 / 74

Multiplexer Configuration
2-3
Figure 2-4
Sensing example
Sensing
Figure 2-4 shows how the multiplexer can be configured to
use instruments that have sensing capability. The main
advantage of using sensing is to cancel the effects of switch
card path resistance (<1
Ω
) and the resistance of external
cabling. Whenever path resistance is a consideration, sensing
should be used.
SMU connections
Figure 2-5 shows how to connect a Keithley Model 236, 237,
or 238 Source Measure Unit to the multiplexer. By using
triax cables that are unterminated at one end, the driven
guard and chassis ground are physically extended all the way
to the card.
Figure 2-5
SMU connections
Source HI
Sense HI
Sense LO
Source LO
Source or
Measure
Bank A
Input 1-4
7035
H
L
H
L
DUT
Input 5-8
Out
Out
Bank B
In
In
Output HI
Guard
Sense HI
Guard
Bank A
Input 1-4
7035
H
L
H
L
DUT
Sense LO
Output LO
Output LO
236/237/238
Triax
Cables (3)
WARNING : Hazardous voltages may be present on
GUARD. Make sure all cable shields are
properly insulated before applying power.
Out
Out
Bank B
In
In
Input 5-8