Datasheet

Page 22
Find us at www.keysight.com
34902A
16-Channel High-Speed Multiplexer
– Scanning up to 250 ch/s
– Two- and four-wire scanning
– Built-in thermocouple reference junction
The Keysight 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 Keysight 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 measurements 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.