Specifications

7
Agilent 34902A
16-Channel
High-Speed Multiplexer
• 250 ch/s scanning
• Two- and four-wire scanning
• Built-in thermocouple reference
junction
The 34902A employs reed relays to
achieve scan rates up to 250 chan-
nels-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.
Agilent 34908A
40-Channel
Single-Ended Multiplexer
• 60 ch/s scanning
• Single-wire switching for common-
low applications
• Built-in thermocouple
reference junction
Use the 34908A for the greatest den-
sity in common-low applications,
such as battery test, component char-
acterization, and benchtop testing.
Each module switches 40 one-wire
inputs. All two-wire internal meas-
urements except current are supported.
The module low connection is isolated
from earth and can float up to 300V.
Backplane Switches
Internal
DMM Input
01
08
Com
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
T
Com
(4W Sen
s
09
16
Internal
DMM Input
(4W Sense)
Reference
Junction
Sensor
Channel Switches
Bank Switch
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: Not recommended for connection to
ac line without external transient suppression.
Note: Thermocouples must be electrically isolat-
ed from each other to avoid current loops and
subsequent measurement errors.