Agilent Technologies 34980A User's Guide download pdf (Page 12)

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34980A matrix switch modules

The 34980A matrix modules are full cross-

point matrices that allow you to connect

any row to any column. This is a convenient

way to connect multiple test instruments to

multiple points on a device under test.

Choose from the following features:

• Latchingarmaturerelays—300V,1A

• High-speedreedrelays—150V,0.5A

• Configurabledual4x8,dual4x16orquad

4x32 modules

• Single-wireconfiguration

(34933A or 34934A)

• Highdensitymatrixwithautomaticsurge

protection and row disconnect for flex-

ible measurements (34934A)

• Analogbusexpandablerowsto

create larger matrices

(34931A, 32A, 33A)

• Connectionsviastandard50or78-pin

Dsub cables or detachable

terminal block

Each cross-point in the matrix switch has

two wires—a high and a low for the mea-

surement. Or, if you prefer, the 34933A and

34934A can be configured as a single-wire

matrix, increasing the number of channels.

The 34933A also has in-rush resistors on

each column for added protection.

The 34934A also has in-rush protection

resistors, but also has an automatic bypass

switch for flexibility in making low-level

measurements.Rowdisconnectswitches

also reduce the capacitance loading when

combining modules to create larger matri-

cies.

Multiple matrix modules can be combined

through the analog bus or the row expan-

sion kit (34934A only) to create a larger

matrix. The matrix can then be connected to

the internal DMM for easy measurements.

Combine your matrix with a multiplexer

switch to achieve the desired switching

topology and get a lower-cost solution with

better specifications. All the matrix switches

include a relay counter to help predict

when relays need to be replaced. Use

the sequencing feature to easily change

between different cross-point setups.

L

H

L

H

L

H

L

H

921

L

H

922

L

H

923

L

H

924

L

H

LHLHLHLHLH

ABus1 DMM

(MEAS)

ABus2 DMM

(SENS)

ABus3

ABus4

Figure 7. 34932A dual 4x16 armature matrix

Note: The 34933A and 34934A have 100

ohm input protection resistors to limit cur-

rent and protect the reed relays.

Figure 8. 34934A quad 4x32 matrix (1 of 4 matricies shown)

. . .

R 2

R 4

R 3

R 1

C 1 – C 32

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 31 32

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