4-wire
resistance measurement using an ohmmeter's two each, force and sense leads.
See Also: Resistance
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Product
PXI Switch - 24-CH 2-Wire Multiplexer Module
PXI-7921
Matrix Switch Module
ADLINK PXI-7921 is a relay multiplexer which consists of 24 2-wire relays (DPDT, 2 Form C). As a multiplexer, the PXI-7921 provides 48x1 1-wire, 24x1 2-wire and 12x1 4-wire configurations. Users could choose one of the configurations by software. PXI-7921 typically connects one instrument, such as a DMM, a digitizer or a signal source, with many points which need measurement or excitation. The contact position of the relays can be changed either by direct software commands or by following the instructions previously stored in the on-board scan list. The scan list advances upon the trigger from external measurement devices, such as a DMM. The scan list could also advance when the scan-delay timer expires. In the PXI-7921, PXI trigger functions are supported and software programmable. Multiple modules can therefore be synchronized without additional field wiring.
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Product
MAX31855 T-Type Thermocouple Arduino Shield
SEN-30004-T03
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Four channel MAX31855 digital thermocouple Arduino Shield. Two versions of this shield are avaliable for each thermocouple type: either 'Ch 0-3' (CS pins use Uno/Mega IO pins 7-10) or 'Ch 4-7' (CS pins use Uno/Mega IO pins 3-6), with the only difference being which set of zero-ohm resistors are populated on the board. This allows use of other SPI devices that may be 'hard coded' to specific digital pins on the Arduino, or simply stacking one of each type together to get a total of eight thermocouple channels on one Arduino.Each order comes with one board and a set of four female, long extension, headers that can be soldered to the board. If stacking two of these modules on top of each other, please order both a Ch 0-3 and a Ch 4-7 board, as well as an additional set of headers for stacking. We're working on sourcing even longer headers, but the ones currently available are not long enough to stack as-is (they need to be double-stacked).The MAX31855T supports a measured temperature range of -270C-400C with known thermal characteristics and output resolution of 0.25C. Included thermocouple connectors are type-specific to provide proper material continuity as close to the IC as possible. The SEN-30004 is interfaced via 3 or 4-wire SPI and a high-speed level shifter is included to allow the board to plug directly into an Arduino Uno or MegaNote: we also offer a universal version of this board in a smaller for factor, the SEN-30003-T.FeaturesType-specific, miniature-sized vertical thermocouple connectors (vertical flat blades, see pics)Measures four (4) thermocouple channels, full extended range.Boards are stackable. Up to 8 thermocouple channels may be connected to an Arduino.14-bit SPI interfacePlugs directly into an Arduino Uno or Mega form factor with built-in voltage level translation on-board.Standard Arduino female headers required for easy configuration, one set included with order (1-6x1, 2-8x1, 1-10x1 0.1" female stackable headers), not soldered on.Detects shorts to GND or VccDetects open thermocoupleOther versions available (K, J, and T stocked). Contact Customer Service to place a custom order.Mounting holes for 4-40 sized screwsConnections are spaced for 0.1" pin headerDesigned, manufactured, tested and shipped from the USA The MAX31855T supports a measured temperature range of -270C-400C with known thermal characteristics and output resolution of 0.25C. Included thermocouple connectors are type-specific to provide proper material continuity as close to the IC as possible. The SEN-30004 is interfaced via 3 or 4-wire SPI and a high-speed level shifter is included to allow the board to plug directly into an Arduino Uno or Mega
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Product
Process Analyzers
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Knick Elektronische Messgeräte GmbH & Co. KG.
Industrial meters for pH, ORP, conductivity and oxygen. In 2- and 4-wire technology, explosion-proof.Bus Communication: HART, FOUNDATION Fieldbus, Profibus DP and PA. Robust industrial housing with high IP protection. Suitable for outdoor use. For analog and digital sensors. Simple intuitive operation. From DIN rail transmitters up to the modular system.
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Product
Resistive Touch Controllers
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Analog Devices offers a range of controller ICs for use with 4-wire resistive touch screens. These controllers can be used in human machine interface applications in consumer, automotive, and other products. Analog Devices’ controllers have 12 bits of resolution, SPI/I2C interface options, and low power consumption, making them ideal for use in handheld devices.
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Product
Kelvin Clip Set
11062A
Accessory Kit
Create custom Kelvin probes for 4-wire resistance measurements; set contains only the two gold-plated clips
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Product
Rugged Igniter Tester
4314 KV
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Model 4314 KV is a 4-wire ohmmeter designed to use low test currents for its measurement. Additional circuitry proprietary to Valhalla Scientific is used to ensure that test current levels do not exceed the specified “fail-safe current” even in a worst-case component failure situation.
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Product
3-Slot Data Acquisition Mainframe With GPIB And Three 20-Channel Multiplexer Modules
DAQ973MB
Mainframe
The DAQ973MB Better Multiplexer Bundle offer includes a DAQ973A three-slot data acquisition mainframe and three 20-channel DAQM901A multiplexer modules. This bundle provides the following:3-slot mainframe with USB, LAN, and GPIB6.5-digit (22-bit) internal DMM60 channels of multiplexer switches6 channels of dedicated current measurements2- and 4-wire scanning300 V switching80 channels/s scanningbuilt-in thermocouple reference junctionbuilt-in signal conditioning to measure thermocouples, RTDs and thermistors, AC / DC volts and current; resistance, frequency / period, diode test, and capacitance
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Product
MAX31856 Thermocouple Sensor Arduino Shield
SEN-30007-T
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Quad channel thermocouple Arduino shield based on the MAX31856 universal digital thermocouple interface IC. This is an exciting update of the MAX31855, with improvements in resolution (19 vs 14 bits), on-board temperature reference (6 vs 4 bits), and compensation (fully compensated vs nonlinear correction required). The MAX31856 is interfaced via 4-wire SPI with options for interrupt triggering. An LDO and a high-speed level shifter are included on ALL device pins to allow interfacing with to any Arduino - both 3.3V and 5.0V variants - without sacrificing device performance in any operating condition.
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Product
PXI-2530B, 128-Channel, 1-, 2-, or 4-Wire PXI Multiplexer Switch Module
778572-30
Multiplexer Module
128-Channel, 1-, 2-, or 4-Wire PXI Multiplexer Switch Module—The PXI‑2530B is a high-density, multiconfiguration reed-relay switch. With four multiplexer and three matrix configurations, the PXI‑2530B is an excellent solution for complex or high‑channel‑count systems. Multiplexer configurations include 128x1 (1‑wire), 64x1 (2‑wire), 32x1 (4‑wire), or eight banks of 16x1 (1‑wire). Matrix configurations include 4x32 (1‑wire), 8x16 (1‑wire), or 4x16 (2‑wire). You can implement these configurations by selecting the appropriate terminal block.
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Product
D.C Milli-Ohm Meter with Advanced Features, 4-Wire, Handler/RS-232C/USB Device/GPIB
T3MIL50X
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D.C Milli-Ohm Meter with Advanced Features, 4-Wire, Handler/RS-232C/USB Device/GPIB.
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Product
PXI/PXIe LVDT/RVDT Simulator Module, 2-Banks
41-670-103-AABBCC
Simulator
The 41/43-670-103 is ideal for the simulation of variable differential transformers (VDT), both linear (LVDT) and rotary (RVDT) types. It has two banks, each capable of simulating the output of a single 5 or 6-wire VDT or resolver, or dual 4-wire utilizing a shared excitation signal. This allows the module to simulate up to 2 channels of 5 or 6-wire or 4 channels of 4-wire.
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Product
RS232 / RS485 / RS422 Isolators/ Isolated Converters
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From 3-wire to 7-wire RS232 isolators, 2-wire RS485 to 4-wire RS422 / RS485 isolators, and USB isolators to USB / RS232 / RS485 / RS422 optically-isolated converters, CommFront has all the industrial-grade optical-isolation devices to protect your assets from the unexpected. If off-the-shelf product does not provide enough security for you, we can even tailor-make the devices, which are customizable right down to the nuts and bolts.
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Product
Contact Probe for Solar Panels
TP878.1SS.O
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Contact temperature probe for solar panel. 1/3 DIN 4-wire Pt100 sensor.
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Product
Digital Micro Ohm Meters
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Is used to measure DC low resistance through 4-wire method. Its features are: Comparison function to determine if the device is in good condition, unkown wire length calculation (FT/M); two-way data transmission by USB interface.
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Product
Power Analyzers
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National Meter Industries Inc.
is a panel mounted multimeter that records energy values. Compact and intuitive, with 4-quadrant measurement (Consumption and Generation). Is suitable for Low Voltage installations, in both 3 and 4-wire three-phase circuits,two-phase circuits with or without neutral, single-phase circuits or ARON connections.
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Product
Digital Milliohm Meter and Resistance Tester
4338 mO
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Standard Electric Works Co., Ltd
● Protection class: IP65 (Lid closed)● 4-Wire method for mΩ.● It's about 100mA at 1100.0mΩ range.● It's about 10mA at 11000mΩ range.● Measures down to 100µΩ (0.1mΩ).● Maximum resolution of 100µΩ.● Large LCD (68×34mm).● Relative mode. ● Data hold function.● MAX/MIN function.● Power source: 1.5V "C" battery × 8● Long battery life and stable power. ● Low battery indication.
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Product
PXI Matrix Switch: 4x32, 2-Wire, 100Vrms/2A, Armature Relays
M9120A
Matrix Switch Module
The M9120A high-density matrix offers higher voltage switching of multiple channels in a single instance. Any row can be connected to any column, making it ideal for routing instrument signals to the device under test. This 2-wire switch matrix provides the durable armature switches allowing multiple channels to be connected at one time, up to 60W per channel. The 4-wire wide bus can be used to route signals between test instruments and the device under test. Choose from the durable connector block or standard cable connections.
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Product
SparkFun Triple Axis Accelerometer Breakout
ADXL345
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This new version adds two standoff holes as well as an extra decoupling capacitor. The ADXL345 is a small, thin, low power, 3-axis MEMS accelerometer with high resolution (13-bit) measurement at up to +-16 g. Digital output data is formatted as 16-bit twos complement and is accessible through either a SPI (3- or 4-wire) or I2C digital interface.
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Product
16 Channel Multiplexer (2/4-wire) Module for 34970A/34972A
34902A
Multiplexer Module
The Keysight 34902A module for the 34970A/34972A Data Acquisition/Switch Unit employs reed relays to achieve scan rates up to 250 channels-per-second. Use this module for high-throughput automated test applications as well as high-speed data logging and monitoring tasks.
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Product
MAX31855 K-Type Thermocouple Arduino Shield
SEN-30004-K03
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Four channel MAX31855 digital thermocouple Arduino Shield. Two versions of this shield are avaliable for each thermocouple type: either 'Ch 0-3' (CS pins use Uno/Mega IO pins 7-10) or 'Ch 4-7' (CS pins use Uno/Mega IO pins 3-6), with the only difference being which set of zero-ohm resistors are populated on the board. This allows use of other SPI devices that may be 'hard coded' to specific digital pins on the Arduino, or simply stacking one of each type together to get a total of eight thermocouple channels on one Arduino. The MAX31855K supports a measured temperature range of -270C-1372C with known thermal characteristics and output resolution of 0.25C. Included thermocouple connectors are type-specific to provide proper material continuity as close to the IC as possible. The SEN-30004 is interfaced via 3 or 4-wire SPI and a high-speed level shifter is included to allow the board to plug directly into an Arduino Uno or Mega
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Product
Ground Bond Tester
HYAMP® Series
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HYAMP III includes productivity-enhancing features and proven safety technology to reduce the compliance bottleneck on the production line. All models verify the integrity of your product's ground circuity with accurate 4-wire measurements and offset capability.
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Product
16-Channel RTD Signal Conditioning Card
ProDAQ 5821
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The ProDAQ 5821 series of Signal Conditioning Cards is designed to interface with a variety of sensors, principally RTDs, Thermistors, Cryogenic Diodes and Voltage type sensors. Each version of the 5821 provides the capability of precise 4-wire measurement. In order to achieve this, a precise 500μA constant current source is provided per channel. The current source can be disabled on a per channel basis and is monitored to ensure that current is flowing. The value of the output current is stored on-board after calibration. In order to achieve the highest accuracy the output current may be automatically calibrated 'on-the-fly' using the ProDAQ 3416 24-bit Sigma-Delta ADC card and an on-board precision resistor.
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Product
6.5" VGA Industrial Panel Mount Monitor
IDS-3206
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6.5" VGA LCD panel with LED backlight for 20% power saving and environmental protection. 0° C ~ +50° C range operating temperature, 4-wire resistive touchscreen solution or 3mm tempered smudge resistant protected glass. USB touch interface, Dual signal interface with VGA & DVI, Standard integrated frame.
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Product
Modbus Register Converter
Model 2390
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* Converts Modbus Registers and variables for replacement Modbus devices.* Maintain existing software when upgrading Modbus systems.* Provides serial control of Modbus RTU devices from any ASCII source.* User defined Register Conversion Table supports all Modbus RTU devices.* Internal Register Conversion Tables for Watlow F4-to-EZ-ZONE and F4-to-F4T conversion.* Serial ports support RS-232 and 2-wire/4-wire RS-485 signals.* Includes baud rate conversion capability.* Uses SCPI commands to load the Conversion Table and set serial settings.* Small metal case mounts on a DIN rail or on any flat panel.* 239x Table Loader Program uploads the 2390 Register Conversion Table from an Excel csv file.* 239x Serial Keyboard Program provides instant control of the 2390 and Modbus Slave Devices without writing a program.
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Product
PXI Dual 12x8 Matrix, 2 Pole Switching
40-522-022
Matrix Switch Module
Medium density PXI dual 12x8, 2-pole matrix - it is also available in reed relay formats of 2-pole and 1-pole screened (see "also in this range" on right). The screened version is suitable for switching signals up to 50MHz. Typical applications include signal routing in ATE and data acquisition systems. The two banks may be used for operating a 4-wire measurement system (bank-1 for source, bank-2 for measure). Larger matrices may be constructed by daisy chaining the common signals from multiple PXI Modules.
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Product
I-V Measurement Systems
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The I-V Curve Data Acquisition includes a fixture for holding cells for testing (see Figure 1 below). This fixture can accommodate cells from small to up to 100 mm x 100 mm. Adjustable cell stops, in the X & Y-axis, are provided to consistently locate the cells for testing. Two micro-manipulators are provided as shown in Figure 1. Each micro-manipulator has two spring loaded contacts to allow 4-wire measurement even for cells that have top contacts only. Two back-side voltage contacts are embedded in the Plate (galvanically isolated from the Plate) and make good electrical contact when the cell is held down by vacuum to the plate. All voltage and current probes are gold-plated. The cell is held down with vacuum during testing (built-in vacuum pump).
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Product
Power Quality Analyzers
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3-Phase 4-Wire Power Quality Analyzer Compliant to IEC61000-4-30 Class A Standards with Dynamic 1300V Range, Harmonic and Inter-harmonics Analysis Capabilities
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Product
6.5" VGA 640x480 800nit LVDS LCD With 4W RES. T/S KIT
IDK-1106
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6.5" LCD supports 640 x 480 pixels and wide operating temperature, 4-wire resistive touch solution. Brightness of 800 cd/m2 with LED backlight, LVDS signal interface, LED driver built in.
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Product
Banana-Triax Adapter For 2‑Wire (Non-Kelvin) Connection
N1297A
Accessory Kit
The N1297 Series is a collection of banana-triax adapters for the Keysight B2900 Series precision source measure unit (SMU). It consists of both 2-wire as well as 4-wire connection requirements.
