Section 4: Theory of operation
Model 2657A High Power System SourceMeter® Instrument Reference Manual
4-22
2657A-901-01 Rev. B/December 2012
Figure 88: Contact check circuit configuration
Remote
SENSE HI
HI
Remote
LO
SENSE LO
Local
Local
x1
GUARD
CCHK SW
CCHK SW
+
–
1
2
2
4
4
1
2
3
3
Aggregate
contact
resistances
Feedback
V-source
+
-
50
μ
A
current source
I-meter
A
V
V-meter
50
μ
A
current source
NOTES: 1.
This represents a protection circuit. Do not apply more than 3030 V
between HI and SENSE HI. To maintain specified operation and obtain
accurate measurements, the maximum voltage between HI and
SENSE HI should be no more than 3 V. This limit also applies to
the maximum voltage between LO and SENSE LO.
2.
Approximately 80 k
Ω
.
3.
High impedance differential amplifier.
4.
Approximately 10 M
Ω
.
Содержание 2657A
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