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4 wire Resistance Meters

[^] Model INT2-R digital 4 wire resistance meter
The INT2-R is a low cost yet highly precise, stable, flexible and easy to use 1/8 DIN scalable resistance display, and our top seller, for both display-only and display + output applications. It has a number of useful plug-in options which make it ideal in many control and monitoring applications. It also has a 10 point linearising function, which lets you correct for non-linearities. The front panel buttons can be locked, and there is an optional plain front panel with no buttons, which can be put in place of the standard front, after calibration. If you need to be able to read the display in a reflection, for example in a heads-up display system, you can switch it to display a mirrored image. Interesting fact The INT2-R is the latest release of this well established display, which was first sold 12 years ago. The fact that it is still a popular seller after all these years is proof that it is 'right' for the job. We designed it, we build it, we know it inside out, so you can count on us for first class support. Plus... You can now order this display with digits up to 400mm high! Exactly the same well-proven software and hardware, but with digits of 57mm, 102mm, 150mm, 200mm, 300mm or 400mm high. Ideal for large factories, or anywhere where you need to see your important measurements from far away, inside or outside. The large version is known as the Fusion family, sealed IP65 all round. See here.
See operating Manual (new Mk2 version)
See operating Manual (old Mk1 version)
See datasheet
See model number & pricing calculator

INT2-R Specifications
Approvals	Produced to IPC 610 Class 2 Standard UL ISO9001:2008 QA CERT.
Input connections	4 wire.
Input Signal	Ranges available: 0-2.000 Ohm 50mA excitation, 100mV sense 0-20.00 Ohm 5mA Excitation, 100mV sense 0-200.0 Ohm 50uA Excitation, 10mV sense
Excitation	Constant current depending on range 5mA for 20 Ohm Range, 50mA for 2 Ohm range
Digits	6 digits, 14mm high. Legible up to 7 metres away. 10 readings per second. Variable brightness from front panel.
Digit colour	Red - standard. Green - optional
Scaling	Digital menu-free system, direct. In addition, separate Offset and Scale variables allow you to convert the reading, without affecting calibration.
Filtering	Adjustable 0 to 25 Seconds
Last digit Round-up	Selectable 1,2,5,10,20,50
User linearisation	Up to 10 points, direct or theoretical calibration.
Front panel controls	Calibration, Tare, Reset, Max/Min, Alarms
Power	100-240 VAC std, 11-30VDC option. 10VA Power burden, max.
Accuracy	+/-0.1% of range
Thermal stability - range	+/- 50ppm/^oC
Thermal stability - offset	+/- 30ppm/^oC
Analogue output	Optional plug-in 16 bit module Linearity +/- 0.02% of range 0-20/4-20mA into 0 to 500 Ohms Resolution 0.4uA 0-10V into loads >600 Ohms Resolution 0.2mV -10 to+10V into loads >600 Ohms Resolution 0.4mV Accuracy 0.1%of range Stability 50ppm/C Fully isolated from input and power Fully scalable with digital precision Special features Forward and reverse action possible Can be set to operate from nett or gross value.
Alarm output	Optional plug-in relay SPST modules 2 Alarms rated 5A 250VAC, SPST 4 Alarms rated 2A 250VAC, SPST Selectable normally open or normally closed Optional plug-in relay SPDT modules 2 Alarms rated 5A 250VAC, SPDT Optional plug-in solid state modules 2 Alarms rated 50V 100mA DC. Adjustable hysteresis In-flight compensation facility. Energise or de-energise on trip Special features Adjustable timers to set energise and de-energise delays. Can also be set to pulse for applications needing less than 100% duty cycle. In-band and out-of-band alarm function. Manual and automatic in-flight compensation. Can be set to operate from nett or gross value.
Serial data output	Optional plug-in modules. RS232 RS485 Addressable On demand or continuous output. Special features Can include time and date with RTC option fitted. Can be set to operate from nett or gross value.
Logic inputs	3 logic inputs, individually configurable for Hold, Reset, Tare, Peak/valley, Nett/Gross, Memory Address Normally open, NPN or contact closure input to activate. 5V open circuit, 1mA switched current.
Real time clock option	Accuracy better than 2 minutes per year. Allows date and time to be included in serial data, for example for printing time-stamped records. Automatic summer/winter time correction for Europe and USA Battery backup to maintain timing whilst switched off. Type = CR1620 3V Lithium
Environmental	Storage -20 to +70C Operating 0 to 50C Non condensing. Optional IP67 cover SPC4
Connectors	Detachable screw terminals
Bezel size	96mm wide x 48mm high. 13mm forward.
Panel cutout	92mm wide x 45mm high. +1mm, -0mm
Depth behind panel	125mm including connectors + cable.
Sealing	IP65 standard, IP67 with optional SPC4 cover

Resistance measuring panel meter with compensation

The problem...
Many people use resistance meters to check that a coil winding has the correct number of turns, or to check for shorted turns.

The problem is, the resistance of some materials, such as copper, changes with temperature - more than most people realise.

For every 10 deg.C temperature change, the resistance of a coil of copper will change by around 4%. This sensitivity means that normal resistance readings have little meaning in QA applications, unless you monitor the temperature of the resistance.

Let's say you measure the resistance of a copper coil at 30 degrees C.

Assume it reads 5.000 Ohms

At 20 degrees C it would read 4.803 Ohms.

The solution...
We've developed a meter which will compensate for changes in ambient temperature. It gives a constant reading for any given coil, regardless of ambient temperature.

Temperature compensated resistance measurement system

This means you don't need to refer to a chart to correct for temperature changes.

Model INT-R-COMP.
Options include:
Alarm relay outputs (2 or 4 relays)
Isolated analogue output, 4-20mA or 0-10V
Serial data output, RS232 or RS422

Resistance ranges include: