TECHNICAL MANUAL
620020E05
Due to the continuous products improvement, the indications of the present manual can be modified without previous warning and in any
case are a contract commitment. The present information publishing does not represent resignation of intellectual property or patent.
Copyright
2009-2010 S.A. Sistel -E 08211 BARCELONA
Pag. 6
3. Description and main features
The multiplexer YAV904X8 is designed for the isolated switching of DMM signals. Its four
branches are featuring 8 double relays each. By joining the common pins of each branch, a
32 relays multiplexer can be set.
In the case the system requires high precission measurements, a two branch matrix can be
configured, allowing 4-wire measurements (resistors), voltage measurements by using
guards or bridges excitation while measuring (the case of load cells).
The board is organized in 4 groups of 8 bipolar relays, with double contact acces to each
branch, therefore, we have the possibility to set up different multiplexer configurations,
depending on the connections we make inside the test fixture:
Set up
Connections inside the fixture
1x 32 relays multiplexer
Join pin 30 to pin 36
Join pin 31 to pin 37
Join pin 63 to pin 67
Join pin 64 to pin 68
Join pin 94 to pin 5
Join pin 95 to pin 69
2x 16 relays multiplexer
Join pin 30 to pin 36
Join pin 31 to pin 37
Join pin 94 to pin 5
Join pin 95 to pin 69
Four times 1x 8 multiplexer
Don’t join anything
Two times 1x 8 + 1x 16 multiplexer
Join pin 94 to pin 5
Join pin 95 to pin 69
1x8 + 1x 24 multiplexers
Join pin 63 to pin 67
Join pin 64 to pin 68
Join pin 94 to pin 5
Join pin 95 to pin 69
3.1 General features
32 DPST relays up to 60V 1A
Configurable as matrix or scanner mode
Lab View drivers available
3.2 Typical applications with YAV904X8
Two or four wires measuring instruments switching
2 wire floating loads selection
