14 | Keysight | 34980A Multifunction Switch/Measure Unit - Data Sheet

Table 4. Matrix selection table—speciications and characteristics

34931A

34932A

34933A

34934A

Channels/conigurations

dual 4x8

8x8

4x16

dual 4x16

8x16

4x32

dual 4x8

8x8

4x16

quad 4x8, 1-wire

quad 4x32

4x128

8x64

16x32

Switch type

Armature

latching

Armature

latching

Reed

non-latching

Reed

non-latching

Input characteristics (per channel)

Max volts

± 100 V peak

Max current (DC, AC RMS)

Switch current

Carry current

1 A

2 A

1 A

2 A

0.5 A

0.5 A

60 W

60 W

10 W

Volt-Hertz limit

< 1.5 Ω

< 1.5 Ω

< 1.5

nominal

< 1Ω/100 Ω

General Speciications

< 3 uV

< 3 uV

< 50 uV

< 100 uV 1-wire

< 20 uV

< 50 uV 1-wire

DC Isolation (ch-ch, ch-earth)

> 10G Ω

> 10G Ω

> 10G Ω

10G Ω

AC characteristics

30 MHz

30 MHz

2 MHz 1-wire

35 MHz 2-wire

15 MHz 1-wire

300 kHz

1 MHz

20 MHz

–65 dB

–55 dB

–30 dB

–65 dB

–55 dB

–30 dB

–65 dB

–55 dB

–40 dB

–65 dB

–55 dB

–33 dB

Capacitance at terminal block

HI-LO

LO – earth

50 pF

80 pF

50 pF

80 pF

80 pF

75 pF

45 pF

250 pF

General characteristics

Relay life, typical

No load

10 V, 100 mA

Rated load

100 M

10 M

100 k

100 M

10 M

100 k

1000 M

10 M

10 k

1000 M operations

Open/close time

4 ms/4 ms

4 ms/4 ms

0.5 ms/0.5 ms

0.35 ms/0.10 ms

Analog bus backplane connection

Bank 2

Bank 2

Bank 2

No

[1]

DC or AC RMS voltage, channel-to-channel or channel-to-earth

[2]

Peak voltage, channel-to-channel or channel-to-earth

[3] Into analog bus. System errors are included in the internal DMM measurement accuracy specifications

[4] 50 Ω source, 50 Ω load, differential measurements verified (Sdd21)

[5] With input resistors bypassed. Bypassing resistors will reduce lifetime of relays. See the rated load relay life characteristics.

[6]

Limited to 6 W channel resistance power loss per module

[7] Power restrictions allow only 20 channels to be closed at one time

[8]

Protection Resistors:

34933A - 100Ω ±5%; 0.5W; TC = ±200ppm/°C.

34934A - 100Ω ±1%; 0.25W; TC = ±100ppm/°C.

If this resistance is not bypassed in the low side source line of a 4-wire resistance measurement, the 100 Ω range is limited.

[9] Channel resistance is typically < 1.5 Ω but can go as high as 50 Ω when a channel is used in measurement applications with < 10 mA

load current. Increased relay channel resistance for measurements with load currents below 10 mA can occur on cards that have been

out of service or following relay inactivity for periods of greater than 1 week. Switching relays for 2K cycles prior to use may reduce

the variation in channel resistance. Applies to the 34931A and 34932A. Keysight recommends the use of 4-wire Ohms for resistance

measurements. For high accuracy voltage measurements, select the DMM input resistance setting of > 10 G ohms to minimize the

impact of relay contact resistance.