Your local contact:test method
Temperature compensation
Temperature compensation of electrical resistors
Temperature compensation is not a standalone test method, but a mandatory prerequisite for being able to meaningfully compare temperature-dependent resistances with each other. Manufacturer specifications for products with temperature-dependent resistances therefore always refer to a defined reference temperature, for example 20 °C.
If a resistance measurement is subsequently performed at a different temperature, for instance 33 °C, the measured value without temperature compensation is not directly comparable with the factory specifications. Only by converting to the reference temperature is a correct evaluation and comparability of the measurement results enabled.
Temperature Compensation for Ohmic Resistances
Ohmic resistances change their resistance value with temperature. This is caused by the temperature-dependent resistivity of the material used, e.g., copper or aluminum. This property is described by the temperature coefficient (TC or TCR). Using a mathematical relationship, the resistance at a specific temperature can be calculated – and conversely, the temperature can be determined from the measured resistance.
Temperature Compensation for Insulation Resistances
Insulation resistances exhibit a pronounced dependence on temperature. With increasing temperature, insulation resistance typically decreases significantly, often by several orders of magnitude. This is caused by physical effects such as increased charge carrier mobility, material-specific conduction mechanisms, and influences from moisture and aging. In contrast to ohmic resistances, this behavior is not described by a linear temperature coefficient, but frequently by empirical or exponential relationships.
For temperature-dependent insulation resistances to be comparable and correctly evaluated, the temperature of the device under test must be known. It is determined either via an ambient temperature sensor or – for higher measurement accuracy – via a temperature sensor directly attached to the device under test. Alternatively, a radiation pyrometer can be used for non-contact measurement.
Based on the determined temperature, the measured insulation resistance is converted to the value it would have at a defined reference temperature (e.g., 20 °C or 40 °C). This conversion is referred to as temperature compensation of the insulation resistance.
Test devices and Test systems
GLP2-R
For EOL testing
For fast automation processes and inline quality assurance
For laboratories and manual measurements
- Four-wire technology, eliminates line and contact resistances
- Measurement cable break detection
- Contacting error detector
- Temperature compensation for temperature-dependent resistances
- Surface or ambient temperature measurement
- Automatically executing test steps
- Built-in switch-over between different test points
- Test points modularly expandable with relay matrices
Communication with
«» PC
«» PLC
«» LabVIEW®
«» MES / ERP
«» Fieldbus e.g. PROFIBUS …
«» Industrial Ethernet e.g. PROFINET, EtherCAT, EtherNet/IP, Modbus-TCP …
GLP2-MODULAR
Multifunction test device with up to 25 test methods
- “All in one”
- Safety test devices
- Safety & functional test devices
- Modularly combinable from over 25 test methods
- Up to 250 test connections
- Switching matrixes for all types of test methods
- PL e, SIL 3, two-hand control Type III C, Cat. 4 safety circuit (depending on device variant and degree of hazard)
- Network
- Protocol & label printing
- Scanner …
- Technology Package for even greater ergonomics
GLP3
Class-leading test technology unlimited
The top class of test and measurement technology for safety & function test.
- “All in one”
- Safety & functional test devices
- For complex projects
- For complex automation
- For highest demands
- Modularly combinable from over 30 test methods
- Up to 350 test connections
- Switching matrices for all types of test methods
- PL e, SIL 3, Cat. 4 safety circuit, two-hand operation 2-channel safety
- Windows 11®
- Network
- Protocol & label printing
- Industry 4.0
- Interfaces for automation such as PROFINET, EtherCAT, TCP/IP, …
- Interfaces to MES, ERP, CAQ systems, …
GLP3-M
Electric motor Test - EOL, Series and Laboratory
For production, EOL and automation
For test laboratories
Test benches for functional and safety testing of all types of Motors.
- Asynchronous Motors
- Synchronous Motors
- Linear Motors
- Stepper Motors
- BLDC
- DC Motors
- …
- Motor attachments
– Brake
– Temperature sensors
– Humidity sensors
– Auxiliary heating
– Fan
– Centrifugal switch
– Rotor position sensors, Encoders, Resolvers, Multiturn encoders …
– Electronic nameplate
MotorAnalyzer1
The entry-level model for your Motor service
CHECK YOUR MOTOR’S HEALTH!
For electric motor service and repair
For electric motor repair
For maintenance, servicing, and service
- Universal stator, armature, Motor, and transformer Test device
- 10 built-in test methods
- Automatic measurement between the three Connections of a three-phase Motor
- Built-in results database
- Transmission of the results via RS-232 or USB interface to the PC
- Mains-independent battery operation with battery status indicator
- Extremely compact design
- Ideal tool for on-site use and for the workshop
MotorAnalyzer3
The mobile ALL-IN-ONE professional model for your Motor service
CHECK YOUR MOTOR’S HEALTH!
For electric motor service and repair
For electric motor repair
For maintenance, servicing, and service
- Globally unique – the mobile ALL-IN-ONE test device
- AutoTest – the fastest troubleshooting
- Battery operation – Test nonstop
- surge test up to 3 kV | 0.45 Joule
- High voltage DC up to 6 kV
- Insulation up to 500 GΩ
- Polarization index and DAR
- LCR measurement
- Automatic measurement between the four relevant Connection points of the three-phase Motor
- three winding Connections
- one housing Connection (laminated core or Motor housing)
- Communication with
«» PC via Bluetooth
MTC2 R7
Universal winding Test devices 6, 12, 15, 30, 40 and 50 kV
MTC2 winding Test systems are very compact, fully automatic high-end Test devices for a wide variety of winding goods in development, production, and Test laboratory.
For production, EOL, automation
For test laboratory, R&D, approval, certification tests
For repair, maintenance, and service
surge test
-
- Ultra-fast 50 measurements per second
- Phase comparison between phases
- Patented peak-to-peak measurement
Partial discharge compliant with DIN EN 60034-18:2014
-
- Passive or active antenna
- Conducted coupling
ohmic resistance
-
- Winding
- Temperature sensor
insulation resistance
-
- IR
- PI
- DAR
High voltage AC optional
Test connections
-
- Standard: 4
- Optional: 7 and more
MTC3 R2
The high-end test systems for Motor production – without limit
MTC3 winding test systems are fully automatic high-end test devices for various winding goods in development, production, and test laboratories.
For production, EOL, automation
For test laboratory, R&D, approval, certification tests
- Testing of stators, rotors, transformers and inductors
- Surge test up to 15 kV
- Fully built-in partial discharge test according to IEC 61934 and DIN EN 60034-18-41
- Resistance measurement in four-wire technology with temperature compensation
- Insulation resistance test with automatic PI measurement
- Inductance test | LCR inductance measurement bridge
- High voltage test AC according to VDE standard
- Partial discharge at high voltage AC
- Insulation test DC
- Precise four-wire resistance measurement with temperature compensation down to the µΩ-space
- Rotating field test with static probe
- Expansion to up to 150 connections
- Temperature sensor test for 1, 2, 3 … x sensors
* indicates required fields