The Keysight 34901A is a 20-channel multiplexer module designed for the 34970A and 34972A Data Acquisition/Switch Units. It provides high-performance multi-function switching with a scanning rate of up to 60 channels per second, integrated cold junction compensation, and two dedicated fused 1A current channels, making it the most versatile and dense multiplexing solution for diverse data acquisition applications.
Specifications
General
| Parameter | Value |
|---|---|
| Interfaces | Internal backplane interface to 34970A/34972A mainframes |
Physical
| Parameter | Value |
|---|---|
| Power Supply | Powered directly from mainframe backplane |
| Operating Temperature | 0 °C to 55 °C |
Channel & Configuration
| Parameter | Value |
|---|---|
| Number of Channels | 20 (configured as 2-wire) or 10 (configured as 4-wire) |
| Dedicated Current Channels | 2 channels (fused, 1 A max switching current) |
| Total Channels | 22 channels |
| Configurable Channel Pairs | Yes, for 4-wire resistance measurements |
| Internal Cold Junction Compensation Sensor | Yes (built-in thermocouple reference junction) |
| Connection Type | Built-in screw terminals |
| Relay Technology Type | Armature latching |
| Measurement Configuration Types | DC Volts, AC Volts, 2-wire Ohms, 4-wire Ohms, Temperature (Thermocouple, RTD, Thermistor), Frequency, Period, DC Current, AC Current |
Input Voltage & Current Limits
| Parameter | Value |
|---|---|
| Maximum Switching Voltage (DC) | 300 V |
| Maximum Switching Voltage (AC RMS) | 300 V |
| Maximum Switching Current (DC) | 1 A |
| Maximum Switching Current (AC RMS) | 1 A |
| Maximum Switching Power (W) | 50 W |
| Maximum Switching Power (VA) | 50 VA |
| Maximum Common Mode Voltage (Channel to Channel) | 300 V |
| Maximum Common Mode Voltage (Channel to Earth) | 300 V |
DC & Signal Integrity Characteristics
| Parameter | Value |
|---|---|
| Thermal Offset (Thermal EMF) | < 3 µV |
AC & RF Performance
| Parameter | Value |
|---|---|
| Bandwidth (-3 dB limit) | 10 MHz (with 50 Ω source/load) |
Switching Dynamics & Lifetime
| Parameter | Value |
|---|---|
| Maximum Scanning Speed | 60 channels/second |
| Mechanical Life Expectancy | 100,000,000 cycles |
| Electrical Life Expectancy (at rated load) | 100,000 cycles |
| Built-in Relay Cycle Counter Support | Yes (stored in non-volatile memory on module) |
Physical & Hardware Specifications
| Parameter | Value |
|---|---|
| Terminal Block Type | Integrated screw terminal |
Environmental & Safety Compliance
| Parameter | Value |
|---|---|
| Storage Temperature Range | -40 °C to 70 °C |
| Operating Humidity Limit | 80% R.H. at 40 °C (non-condensing) |
| Operating Altitude Limit | 2000 meters |
System Compatibility & Accessories
| Parameter | Value |
|---|---|
| Compatible Mainframes | Keysight / Agilent 34970A, 34972A |
Measurement Capabilities
| Parameter | Value |
|---|---|
| Supported Thermocouple Types | B, E, J, K, N, R, S, T |
Technology
Armature Relay
Applications
Data Acquisition, Multiplexing, Temperature & Electrical Testing