# Keysight DAQM904A 4x8 Two-Wire Matrix Switch Module # Keysight DAQM904A 4x8 Two-Wire Matrix Switch Module ## Key Features At A Glance - Built-in 6½-digit (22-bit) DMM with 0.003% basic 1-year DC voltage accuracy - Directly measures 12 input types — temperature, DC/AC volts, 2-/4-wire resistance, frequency, current and capacitance - 3-slot mainframe accepts nine plug-in modules, including a 4-channel 24-bit simultaneous-sampling digitizer - Up to 120 channels per system with scan rates up to 450 ch/s (up to 500 ch/s on the DAQ973A) - 1 million-reading nonvolatile memory with automatic time-stamping - 4.3-inch color display with numeric, bar-graph, trend-chart and histogram views - LAN and USB standard for PC connectivity; GPIB (IEEE-488) added on the DAQ973A - Code compatible with 34970A/34972A; BenchVue DAQ software included The Keysight DAQ970A and DAQ973A form a three-slot data acquisition system built around a 6½-digit (22-bit) internal DMM. Keysight embedded the measurement engine from its high-performance benchtop DMM inside a compact mainframe, pairing proven measurement performance with universal inputs, built-in signal conditioning, and modular flexibility. The internal auto-ranging DMM directly measures twelve different functions, eliminating the need for external signal conditioning while delivering both bench-grade accuracy and the channel-count scalability of a modular data acquisition front end. The system serves two roles: an easy-to-use data logger for monitoring and characterization, and a data acquisition front end for automated test. Typical data-logging applications include environmental chamber monitoring, component inspection, benchtop testing, process troubleshooting, and temperature profiling. It suits both the R&D engineer characterizing a new design and the manufacturing engineer building a test system or troubleshooting a process, with a flexible modular design scalable from 4 to 120 channels. ## Brand Heritage Keysight Technologies traces its roots to Hewlett-Packard. HP's test-and-measurement business was spun off as Agilent Technologies in 1999, and Agilent's electronic measurement division became Keysight Technologies in 2014. ## Compare Other Models in This Series The DAQ970A/DAQ973A series consists of two three-slot mainframes that share the same 6½-digit internal DMM, the same nine plug-in modules, and the same core measurement performance — 0.003% basic 1-year DC voltage accuracy, scan rates up to 450 ch/s, 120-channel capacity, and one million points of nonvolatile memory. Both deliver the same combination of a simple user interface, low per-channel cost, modular flexibility, and standard connectivity. The two models differ in their built-in computer interfaces. Both mainframes include Gigabit LAN and USB 2.0; the DAQ973A additionally provides a built-in GPIB (IEEE-488) interface for integration into bus-based automated test systems. The comparison table below summarizes the interface and throughput differences between the two mainframes. Each model below links to its own dedicated product page with condition-matched pricing for the configuration you need. Select the new mainframe that matches your interface and throughput requirements; plug-in modules are ordered separately so you can build only the channel count and switching functions your application requires. The DAQ973A is the interface-complete mainframe of the pair, adding built-in GPIB alongside LAN and USB, and reaching scan rates up to 500 ch/s with the DAQM900A multiplexer where the DAQ970A reaches 450 ch/s on the same module. The functional difference between the two mainframes is connectivity: the DAQ970A offers USB and LAN, while the DAQ973A offers USB, LAN, and GPIB. That GPIB interface is the deciding factor for buyers integrating the system into an existing IEEE-488 instrument bus. For reading stored memory out over GPIB, the DAQ973A reaches up to 2,500 readings per second, while both mainframes reach up to 120,000 readings per second over LAN and 55,000 per second over USB. Throughput on most plug-in modules is identical across both mainframes, with one exception shown in the comparison table: the DAQM900A solid-state multiplexer scans DC voltage and resistance channels at up to 450 ch/s on the DAQ970A and up to 500 ch/s on the DAQ973A. Both mainframes are otherwise code compatible with the earlier 34970A/34972A and run the same nine modules, so the choice between them comes down to whether GPIB is required. Model Type Channels Max Voltage **DAQM904A** 4x8 Matrix, 2-wire armature 4 x 8 (32 cross-points) 300 V DAQ970A DAQ Mainframe + 6½ digit DMM (USB, LAN) Up to 120 300 V DAQ973A DAQ Mainframe + 6½ digit DMM (USB, LAN, GPIB) Up to 120 300 V DAQM900A 2-wire solid state (4-wire selectable) 20 120 V Additional differences in specifications beyond the few shown above are not listed here — see each model's full specifications below. ## Product Core & Specifications Specification Value General Number of channels 4 x 8 (32 two-wire cross-points) Type 2-wire armature matrix Open/close speed 120 ch/s Maximum cross-points per frame 96 Input (Typical) Maximum voltage (dc, ac rms) 300 V Maximum current (dc, ac rms) 1 A Maximum power (W, VA) 50 W Bandwidth 10 MHz DC Characteristics (Typical) Offset voltage (incremental to DMM specs) < 1 µV Initial closed channel R < 1.0 Ω Isolation Ch-Ch, Ch-Earth \> 10 GΩ AC / Other Characteristics (Typical) Ch-Ch crosstalk (at 1 MHz) \-50 dB Capacitance (Hi-Lo) < 50 pF Capacitance (Lo-Earth) < 80 pF Volt-Hertz limit 10^8 Switch life (no load) 100 M Switch life (rated load) 100 K Operating temperature 0 to 55 ºC Storage temperature \-40 ºC to 70 ºC > **Important:** The DMM input section provides up to 300 V of input isolation from the instrument's earth-referenced circuitry and computer interface. > **Important:** The internal DMM connections are accessible only through the DAQM900A, DAQM901A, DAQM902A, and DAQM908A low-frequency multiplexers; at least one plug-in module must be installed (and is ordered separately) to route measurements to the DAQ970A/DAQ973A internal DMM. > **Important:** On-module screw terminals accept wire sizes from 16-gage to 22-gage; 20-gage wire is recommended for high channel count applications. > **Important:** The DAQM902A requires user-provided shunt resistors for current measurements. > **Important:** All VAC ranges are limited to 8 x 10^7 Volt-Hz. > Recommended pairing: combine the DAQM909A 4-channel simultaneous-sampling digitizer with the included BenchVue DAQ software to access FFT, THD, THD+N, and SINAD frequency-domain measurements. ValueTronics supplies both new and used test and measurement equipment. New units ship factory-sealed, exactly as received from the manufacturer; every used unit is inspected and functionally verified in-house at our 20,000 sq ft secure facility in Elgin, Illinois before it ships. Our Test Architects can help you select the condition, calibration, and configuration that fit your application. **Please review the Manufacturer's Data Sheet to verify published specifications. Feedback on this webpage is always welcome — please reach out to your Test Architect at any time for questions or concerns. Thank you, we truly appreciate you being our customer.** ## Details - **Price:** 895.0 USD - **Vendor:** Keysight - **Type:** Module - **Tags:** 904, Agilent, consignment-active, DAQM904, DAQM904A, Data Log, Factory New, Inc., Keysight, Keysight Technologies, Mainframe, Manufacturers, Model 904, Module, Other Equipment, product_manual_group_1, product_manual_group_3, Product_new, Switch ## Variants | Variant | Price | Available | |---------|-------|-----------| | Default Title | 895.00 USD | In stock | ## Images - DAQM904A Keysight Technologies Module --- > Source: [ValueTronics](https://valuetronics.com/products/daqm904a-keysight-module-new) > Updated: 2026-06-02