Atec Agilent-34972A - Manual (Page 22)

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34902A
16-Channel High-Speed Multiplexer
• Scanning up to 250 ch/s
• Two- and four-wire scanning
• Built-in thermocouple reference
junction
The Agilent 34902A employs reed
relays to achieve scan rates up
to 250 channels per second. Use
this module for high-throughput
automated test applications as well
as high-speed data logging and
monitoring tasks.
Sixteen two-wire inputs switch up to
300 V. Two- and four-wire channels
may be mixed on the same module.
User provided shunt resistors are
required for current measurements.
34908A
40-Channel Single-Ended Multiplexer
• 60 ch/s scanning
• Single-wire switching for common
low applications
• Built-in thermocouple reference
junction
Use the Agilent 34908A for the
greatest density in common low
applications, such as battery test,
component characterization, and
benchtop testing.
Each module switches 40 one-wire
inputs. All two-wire internal measure-
ments except current are supported.
The module low connection is
isolated from earth and can float
up to 300 V.
Backplane switches
Internal
DMM input
01
08
Com
Com
(4W sense)
09
16
Internal
DMM input
(4W sense)
Reference
junction
sensor
Channel switches
Bank switch
H
L
H
L
T
H
L
H
L
H
L
H
L
H
L
H
L
01
20
21
40
Com
Com
H
H
L
H
H
H
L
H
Channel switches
Backplane
switch
Bank switch
Internal
DMM input
Reference
junction
sensor
T
Note: Thermocouples must be electrically isolated from each
other to avoid current loops and subsequent measurement errors.
Note: Not recommended for connection to ac line without
external transient suppression.