14 | Keysight | 34980A Multifunction Switch/Measure Unit - Data Sheet
Table 4. Matrix selection table—speciꢁcations and characteristics
34931A
34932A
34933A
34934A
Channels/conꢀgurations
dual 4x8
8x8
dual 4x16
8x16
dual 4x8
8x8
quad 4x32
4x128
4x16
4x32
4x16
8x64
quad 4x8, 1-wire
16x32
Switch type
Armature
latching
Armature
latching
Reed
non-latching
Reed
non-latching
Input characteristics (per channel)
Max volts
± 300 V [1]
± 300 V [1]
± 150 V peak [2]
± 100 V peak
Max current (DC, AC RMS)
Switch current
Carry current
1 A
2 A
1 A
2 A
0.5 A [5]/0.05 A [8]
1.5 A [5]/0.05 A [8]
0.5 A
0.5 A
Power (W, VA) [2, 6]
60 W
108
60 W
108
10 W [7]
108
10 W
108
Volt-Hertz limit
Initial closed channel res [3][9]
< 1.5 Ω
< 1.5 Ω
<
1.5 Ω [5]/200 Ω [8]
< 1Ω/100 Ω
nominal
General Speciꢀcations
Offset voltage [3]
< 3 uV
< 3 uV
< 50 uV
< 20 uV
< 100 uV 1-wire
< 50 uV 1-wire
DC Isolation (ch-ch, ch-earth)
AC characteristics
> 10G Ω
> 10G Ω
> 10G Ω
10G Ω
Bandwidth at terminal block [4]
30 MHz
30 MHz
30 MHz [5]/4 MHz [8] 35 MHz 2-wire
2 MHz 1-wire
15 MHz 1-wire
Crosstalk at terminal block (ch-ch) [4]
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
Bank 2
4 ms/4 ms
Bank 2
0.5 ms/0.5 ms
Bank 2
0.35 ms/0.10 ms
No
Analog bus backplane connection
[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.
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