Low Frequency Modules
Module	Description	Max Volts	Max Current	BW (MHz)	Scan Ch/Sec	Thermal Offset	Comments
Multiplexers
34921A	40-ch armature multiplexer w/ low thermal offset	300 V	1 A	45 MHz	100	<3 µV	· Temp reference · 4 current channels · Config as 2- or 4-wire
34922A	70-ch armature multiplexer	300 V	1 A	25 MHz	100	<3 µV	Config as 2- or 4-wire
34923A	40/80-ch reed multiplexer	80 V peak	0.5 A	45 MHz	500	<50 µV	Config as 1-, 2- or 4-wire
34924A	70-ch reed multiplexer	80 V peak	0.5 A	25 MHz	500	<50 µV	Config as 2- or 4-wire
34925A	40/80-ch optically isolated FET multiplexer	±80 V	0.05 A	1 MHz	Contact Factory	<3 µV	Config as 1-, 2- or 4-wire
Matricies
34931A	Dual 4x8 armature matrix	300 V	1 A	30 MHz	100	<3 µV	Backplane expandable
34932A	Dual 4x16 armature matrix	300 V	1 A	30 MHz	100	<3 µV	Backplane expandable
34933A	Dual/Quad 4x8 reed matrix	80 V peak	0.5 A	30 MHz	500	<50 µV	Backplane expandable Config as 1- or 2-wire
General Purpose
34937A	28-ch Form C and 4-channel Form A	300 V 30 VDC/250 VAC	1 A 5 A	10 MHz	N/A	3 µV
34938A	20-ch 5 Amp Form A	30 VDC / 250 VAC	5 A	10 MHz	N/A	3 µV

RF and Microwave Modules
Module	Description	Insertion Loss	Cross Talk	Bandwidth	SWR	Input Impedence	Comments
34941A	Quad 1x4 50 Ù 1.5 GHz RF multiplexer	Contact factory	Contact factory	Contact factory	Contact factory	50 Ù	Specs @ 100 MHz
34942A	Quad 1x4 75 Ù 1.5 GHz RF multiplexer	Contact factory	Contact factory	Contact factory	Contact factory	75 Ù	Contact factory
34945A	Microwave switch/attenuator driver
34946A	Dual 1x2 SPDT terminated microwave switch	<0.42 dB <0.69 dB	>85 dB >67dB	4 GHz or 20 GHz	<1.15 <1.30	50 Ù	@ 4 GHz @ 20 GHz
34947A	Triple 1x2 SPDT unterminated microwave switch	<0.42 dB <0.69 dB	>85 dB >67 dB	4 GHz or 20 GHz	<1.15 <1.30	50 Ù	@ 4 GHz @ 20 GHz

System Control Modules
Module	Description
34950A	64-bit digital I/O with memory and counter	Eight 8-bit digital I/O channels with programmable polarity, thresholds up to 5 V, 7 handshaking protocols and pattern memory. Two 20 MHz frequency counter/totalizers.
34951A	4-channel isolated D/A converter with waveform memory	Output DC voltage up to ±16 V or DC current up to ±20 Output waveforms with a 200 kHz update rate and 16 bits of resolution. Use on-board memory to create waveforms with more than  500,000 points.
34952A	Multifunction module with 32-bit DIO, 2-ch D/A and totalizer	Four 8-bit digital I/O channels, two ±12-V analog outputs, and a 100 kHz gated totalizer.
34959A	Breadboard module	Create your own custom designs with access to the +12 V and +5 V supplies, 16 GPIO ports and 32 drive lines.