20 | Keysight | 34970A Data Acquisition/Switch Unit Family - Technical Overview
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Modules specifications
The Keysight 34970A/34972A accuracy specifications already
include the switching offset and reference junction errors shown
below� These errors are listed separately for determining system
error with external measurement devices�
Up to three modules, in any combination, can be inserted
into a single mainframe� The 34970A/34972A’s internal DMM
connections are accessible only through the 34901A, 34902A,
and 34908A low-frequency multiplexers�
On-module screw terminals accept wire sizes from
16 gage to 22 gage� Twenty-gage wire is recommended for
high channel count applications� The 34905A and 34906A RF
Multiplexers use SMB connectors� A standard set of (10) BNC-
to-SMB adapter cables is provided with each
RF module for convenient BNC connections�
Multiplexer Actuator Matrix RF multiplexer Multifunction
34901A 34902A
[1]
34908A 34903A 34904A 34905A 34906A 34907A
General
Number of channels 20 + 2 16 40 20 4 x 8 Dual 1 x 4 See page 25
for module
specifications
2/4 wire 2/4 wire 1 wire SPDT 2 wire 50 Ω 75 Ω
Connects to internal DMM
● ● ●
Scanning speed
60 ch/s 250 ch/s
[1]
60 ch/s
Open/close speed 120/s 120/s 70/s 120/s 120/s 60/s
Input
Voltage (dc , ac rms)
[2]
300 V 300 V 300 V 300 V 300 V 42 V
Current (dc , ac rms) 1 A 50 mA 1 A 1 A 1 A 0.7 A
Power (W , VA)
50 W
2 W 50 W
50 W
50 W 20 W
DC characteristics
Offset voltage
[3]
< 3 uV < 6 uV < 3 uV < 3 uV < 3 uV < 6 uV
Initial closed channel R
[3]
< 1 Ω < 1 Ω < 1 Ω < 0.2 Ω < 1 Ω < 0.5 Ω
Isolation ch-ch, ch-earth > 10 GΩ > 10 GΩ > 10 GΩ > 10 GΩ > 10 GΩ > 1 GΩ
AC characteristics
Bandwidth
[4]
10 MHz 10 MHz 10 MHz 10 MHz 10 MHz 2 GHz
[5]
2 GHz
[5]
Insertion loss (dB) 10 MHz — — — — — –0.1 –0.1
100 MHz — — — — — –0.4 –0.4
500 MHz — — — — — –0.6 –0.5
1 GHz — — — — — –1 –1
1.5 GHz — — — — — –1.2 –1.5
2 GHz — — — — — -3 -2
SWR 0-9.99 MHz — — — — — 1.02 1.02
10-99.99 MHz — — — — — 1.05 1.05
100-499.99 MHz — — — — — 1.20 1.25
500-999.99 MHz — — — — — 1.20 1.40
1-1.499 GHz — — — — — 1.30 1.40
1.5-2 GHz — — — — — 1.40 2.00
ch-ch cross talk (dB)
[4]
10 MHz –45 –45 –18
[6]
–45 –33 –100 –85
100 MHz — — — — — –85 –75
500 MHz — — — — — –65 –65
1 GHz — — — — — –55 –50
1.5 GHz — — — — — –45 –40
2 GHz — — — — — –35 –35
Risetime < 300 ps
Signal delay < 3 ns
Capacitance HI - LO < 50 pF < 50 pF < 50 pF < 10 pF < 50 pF < 20 pF
LO - Earth < 80 pF < 80 pF < 80 pF < 80 pF < 80 pF —
Volt-Hertz limit 10
8
10
8
10
8
10
8
10
8
10
10
Other
T/C cold junction accuracy
[3]
(typical) 0.8°C 0.8°C 0.8°C
[8]
Switch life No load (typical) 100 M 100 M 100 M 100 M 100 M 5 M 5 M
Rated load (typical)
[7]
100 k 100 k 100 k 100 k 100 k 100 k 100 k
Temperature Operating all cards: 0 to 55°C
Storage all cards: –20 to 70°C
Humidity (non-condensing) all cards: 40°C to 80% RH
[1] Not recommended for connection to ac line without external
transient suppression� Up to 250 ch/s to internal memory�
See scanning rates for measurement condition and rate on each
instrument�
[2] Channel-to-channel or channel-to-earth
[3] Errors included in DMM measurement accuracy specifications
[4] 50 Ω source, 50 Ω load
[5] Bandwidth direct to card SMB connectors
[6] Isolation within channel 1 to 20 or 21 to 40 banks is –40 dB
[7] Applies to resistive loads only
[8] Thermocouple measurements not recommended with 34908A
module due to common lo configuration
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