The Keysight 34921A module for the 34980A Multifunction Switch/Measure Unit is the most versatile multiplexer for general purpose scanning. It has low thermal offset characteristics and a built-in thermocouple reference on the terminal block, making it ideal for temperature measurements directly to the internal DMM. The dense, multi-function switching with 100 channel/second scan rates addresses a broad spectrum of data acquisition applications.
Four additional fused inputs (44 channels total) route up to 1A of current to the internal DMM, allowing AC and DC current measurements without the need for external shunt resistors. Standard 50-pin Dsub connectors allow for use with standard cables, terminal blocks, or mass interconnect solutions.
| Key Features |
| 40 2-wire channels |
| 300V, 1A switch; 2A carry current |
| 100 ch/s scanning |
| Mix 2- or 4-wire configurations |
| Built-in thermocouple reference junction |
| 4 current channels |
| Latching armature relays, with relay counter |
| Specifications |
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| Multifunction Switch/Measurement Unit |
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| Model Overview |
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| Model | Description | Information |
| 34980A | Multifunction data acquisition mainframe
Holds up to 8 Plug-in-Modules
| Comes standard with “DMM” option and BenchVue DAQ |
| BV0006B | BenchVue Data Acquisition Control and Analysis (DAQ)
Holds up to 8 Plug-in-Modules
| BenchVue makes it simple to connect, control instruments, and automate test sequences.
Supported plug-in modules:
34921A
34922A
34923A
34924A
34925A
34931A
34932A
34933A
34937A
34938A
34952A
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| Specifications |
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| Multifunction Switch / Measure Low Frequency Modules |
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| Module Overview |
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| Model | Description | Max. Volts | Max. Current | Scan Ch/Sec |
| Multiplexers |
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| 34921A | 40 Channel Armature | +/- 300V | 1A | 100 |
| 34922A | 40 Channel Armature | +/- 300V | 1A | 100 |
| 34923A | 40/80 Channel Reed | +/- 150V | 0.5A | 500 |
| 34924A | 70 Channel Reed | +/- 150V | 0.5A | 500 |
| 34925A | 40/80 Channel Optically Isolated FET Multiplexer | +/- 80V | 0.5A | 1000 |
| Matrix Switches |
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| 34931A | Dual 4x8 Armature | +/- 300V | 1A | 100 |
| 34932A | Dual 4x16 Armature | +/- 300V | 1A | 100 |
| 34933A | Dual/Quad 4x8 Reed | +/- 150V | 0.5A | 500 |
| GP/Actuator Switches |
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| 34937A | 28 Channel Form C
4 Channel Form A
| 300V
250AC
| 1A
5A
| N/A
N/A
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| 34938A | 20 Channel 5 Amp Form A | 250AC | 5A | N/A |
| Specifications |
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| Multifunction Switch / Measure RF and Microwave Modules |
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| Module Overview |
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| Model | Description | Insertion Loss | Frequency Range | VSWR |
| RF Switching |
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| 34941A | Quad 1x4 50Ohm | 0.6 dB | 3 GHz | < 1.25 |
| 34942A | Quad 1x4 75Ohm | Contact Factory | Contact Factory | Contact Factory |
| Microwave Switching |
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| 34945A | Microwave Switch/ Attenuator Drive | Drive up to 64 external switch coils;
32 SPDT switches
8 multiport switches
8 attenuators
or custom combination
| Drive up to 64 external switch coils;
32 SPDT switches
8 multiport switches
8 attenuators
or custom combination
| Drive up to 64 external switch coils;
32 SPDT switches
8 multiport switches
8 attenuators
or custom combination
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| 34946A | Dual 1x2 SPDT Terminated | < 0.42dB to < 0.69dB | 4 GHz or 20 GHz | < 1.15 to < 1.30 |
| 34947A | Triple 1x2 SPDT Unterminated | < 0.42dB to < 0.69dB | 4 GHz or 20 GHz | < 1.15 to < 1.30 |
| Specifications |
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| Multifunction Switch / Measure System Measurement and Control Modules |
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| Module Overview |
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| Model | Description | Information |
| 34950A | 64 Bit DIO with Memory Counter | Eight 8-bit digital I/O channels
Up to 5 V thresholds
7 handshaking protocols
Pattern memory
Two 10 MHz frequency counter/totalizers
10 MHz programmable clock output
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| 34951A | 4 Channel Isolated D/A Converter with Waveform Memory | Output DC V up to +/-16V or DC current up to +/-20 mA
Output wave forms w/200 kHz update rate and 16 bit resolution
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| 34952A | Multifunction Module with 32 Bit DIO, 2 Channel D/A and Totalizer | Four 8-bit digital I/O channels
2 +/- 12V analog outputs
100 kHz gated totalizer
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| 34959A | Breadboard | Access to +12V and +5V supplies
16 GPIO ports
32 relay drive lines for custom designs
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| Specifications |
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| 34980A Data Acquisition System Module Overview |
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| Model | Description |
Terminal Blocks used for Discrete Wiring.
Supports 20 AWG Wire for 100 Connections
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| 3492xT | Multiplexer terminal blocks |
| 3493xT | Matrix and GP terminal blocks |
| 3495xT | Measurement and control terminal blocks |
