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Grant Maloy Smith
Tuesday, March 14, 2023 · 23 min read
How To Measure Current Using Current
Transducer
In this article we will discuss how electrical current is measured with respect to Data Acquisition (DAQ)
applications today, with enough detail so that you will:
See which current sensors and transducers are available today
Learn the basics of accurate current measurement
Understand how various sensors are applied in current measurement applications
Are you ready to get started? Let’s go!
Introduction
Like voltage, current can be alternating current (AC) or direct current (DC). The electrical current is the intensity
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Measure current with current tranducer
or rate of flow of an electric charge. Similar to measuring the voltage, we sometimes need to measure very tiny
currents, i.e., in the microamp range, while other times we may need to measure very high currents into the
thousands of amperes.
AC and DC current
To handle this wide range of possibilities Dewesoft offers a variety of current transducers and sensors, which
have a voltage output or current that is compatible with one of the voltage signal conditioners available for
our data acquisition test equipment.
Dewesoft DAQ systems can measure electric properties of all major types, including voltage, current, and more.
This combination of sensor and signal conditioner seamlessly converts a wide range of currents to a low-level
output which can be digitized for display, storage, and analysis.
But which sensor should you choose? This article aims to describe the different kinds of current sensors
available, their pros and cons, and which applications each type handles best.
What is electrical current?
As mentioned above, the current is the intensity or rate of flow of an electric charge. In DC systems, the current
flows in one direction, “unidirectionally.” Familiar sources of DC current include batteries and solar cells.
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AC vs DC current
In AC systems the current reverses directions at a given frequency. In our businesses and homes, we have AC
power based on either 50 or 60Hz (depending on your country). This Alternating Current is typically sinusoidal
(e.g. in the shape of a sine wave).
The most typical source of AC is your local power plant. The current created by photovoltaic cells is DC and
must be inverted to AC in order to power our homes. The same is true of a UPS, or computer battery backup
system -- energy is stored in a battery and must be inverted to AC in order to provide household power.
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Alternating current is also used in a non-sinusoidal fashion to modulate information onto the circuit such as in
radio signals and transmission of sound.
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Typical audio signal
The International System of Units (SI) term for current is Ampere, commonly abbreviated to the word “amps”
and written with the symbol A.
Current is also often written with the letter I. This goes back to the French phrase intensité de courant (“current
intensity” in English). Both A and I are acceptable abbreviations for current.
AC current and DC current are often abbreviated as AAC and ADC, respectively.
One ampere equals one coulomb of electrical charge moving past a given place in one second (one coulomb
contains roughly 6.242 × 1018 electrons).
A current always produces a magnetic field. The stronger the current, the stronger the field. By measuring this
field using various techniques: Hall Effect, Induction, or magnetic flux, we can measure the electron flow
(current) in the electric circuit.
HowBlog
can we
measure
current?Base
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Measure current with current tranducer
Since current always creates a magnetic field, there are Hall Effect and other sensors that allow us to measure
this field and thereby measure the current.
It is also possible to connect a shunt resistor within the circuit itself and directly measure the current, as in the
classic ammeter and current shunt. We will look at both methods in the sections that follow.
Open loop vs. closed loop current sensors
You may hear about the open-loop and closed-loop current sensors. What are the differences?
Open-loop current sensors are less expensive than closed-loop varieties such as Zero Flux current sensors.
They consist of a Hall effect sensor mounted in the gap of a magnetic core. The output from the Hall effect
sensor is amplified and measures the field created by the current without making any contact with it. This
provides galvanic isolation between the circuit and the sensor.
Open-loop current sensor
Some open-loop current sensors have compensation electronics that help to offset the drift caused by changes
in ambient temperature. Compared to closed-loop sensors, open-loop sensors are smaller and less expensive.
They have low power requirements and can be used for measuring both AC and DC currents. At the same time,
they are not as accurate as their closed-loop cousins: they are subject to saturation and provide inferior
temperature compensation and noise immunity.
Closed-loop current sensors employ a feedback control circuit to provide an output that is proportional to the
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input. Compared to open-loop sensors, this closed-loop feedback design inherently provides enhanced
accuracy and linearity as well as better temperature drift compensation and resistance to noise.
Closed-loop current sensor
With open-loop sensors, drift caused by temperature, or any non-linearities in the sensor will cause an error. On
the other hand, closed-loop sensors employ a coil that is actively driven by creating a magnetic field that
opposes the current conductor’s field. This is the “closed-loop” that provides enhanced accuracy and saturation
performance.
So which is better? This depends entirely on the application. The lower cost, size, and power requirements make
open-loop current sensors very popular. This is offset somewhat by the fact that their susceptibility to saturation
means that they must be “oversized” in some applications in order to avoid this problem.
Closed-loop current sensors are the clear favourite in applications that require the best possible accuracy and
resistance to saturation, or which are used in environments with wide temperature extremes or electrical noise.
Open-loop current sensors are found in applications like:
Battery-powered circuits (due to their low power profile)
Drive applications where torque accuracy need not be high
Fan and pump current measurement
Welding machines
Battery management systems
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Variable speed drives
Uninterruptible power supply applications
Closed-loop current sensors are found in applications like:
Variable speed drives (when accuracy and linearity are paramount)
Servo controls
Overcurrent protection
Ground fault detectors
AC and DC industrial drives
Robot control
Energy measurement applications
As with every sensor, the desired end result should be the driving factor in choosing a sensor type.
Current measurement applications
As a fundamental component of electricity, current and accurate measurement is essential in countless
applications. Can you imagine a power company not knowing how many amperes it is generating? Or that they
wouldn’t know how much energy its customers were using?
That would be absurd, of course. But there are millions of other purposes and requirements for current
measurement. In fact, these requirements can be categorized as either an open loop or a closed loop.
Note that this is not to be confused with open-loop or closed-loop sensors, as described in the previous
section. Here we are talking about the current measurement application itself as being either an open or closed
loop.
In a closed-loop current measurement application, we need to know the current because we need to control it
in real-time. Applications include:
Components where the current must be limited not to exceed a certain level, e.g., switching power supplies
and battery chargers, to name a few.
Automatic shutdown functions of critical systems based on the current draw.
Current-controlled solenoid valves are used in automobiles, aircraft, etc.
The power amplifier biases current control.
And many more.
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In open-loop current measurement applications, there is no requirement for real-time control, but we need to
know the current value for a variety of purposes, including:
R&D on electro-motors in automobiles, trains, consumer products, etc.
Energy consumption for revenue purposes.
Testing the performance of actuators used in aircraft, rockets, etc.
Measuring the current supply and consumption of electric trains and the third rail and catenary systems
that power them.
Power quality applications for both producers and consumers of energy.
Literally millions of applications in research, manufacturing, automotive, aerospace, military, health sciences,
education, industrial automation, and more.
Major current sensor types
Current sensors
Different current sensors and current transducers are thus available for these various methods, each adapted to
the measuring environment as well as the current range that is intended to be measured. For example, the
requirements for measuring microamps (µA) are greatly different from those required to measure thousands of
amps. We will look at each sensor type and describe its theory of operation as well as its application.
SHUNT
HALL EFFECT
CT
ROGOWSKI
ZERO FLUX
Connection Type
Direct
Indirect
Indirect
Indirect
Indirect
Current
AC and DC
AC and DC
AC
AC
AC and DC
Accuracy
High
Medium
Medium
Low
High
Range
Low
Medium
High
Medium
High
Drift
Low
Medium
Medium
High
Low
Isolation
No 1)
Yes
Yes
Yes
Yes
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1) Shunts can be isolated via either an internal or external signal conditioner, but they are not inherently
isolated
As mentioned earlier, there are two major methods of measuring current:
By direct contact with the current (aka a shunt/ammeter)
By measuring the electromagnetic field or flux of the current
Direct contact with the current
The most common way to measure current is to connect the ammeter (a meter to measure current) or shunt
resistor in series with the circuit. An ammeter or ammeter shunt is really nothing more than a highly accurate
resistor. When we place a precision resistor across a circuit, a voltage drop will occur across it. The shunt
sensor’s output is measured by the data acquisition system, which applies Ohm’s law to determine the
amperage flowing through the circuit.
Note that the maximum current range that a given ammeter is capable of measuring is limited by its resistor’s
value. Therefore a common practice is to add an additional shunt resistor in parallel to increase the maximum
measuring range of our test equipment.
This limitation is why the direct connection to the electrical conductors of a circuit is more widely used in low
current applications, but rarely in high current applications, where indirect measuring sensors like current
clamps and flex coils are far more prevalent.
Shunt current measurement
When you connect a low ohm resistor in parallel with a circuit, the current flows through the shunt resistor -Rand generates a voltage drop.
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Typical shunt measurement hook-up in a simple circuit
We can measure this drop and apply Ohm’s law to calculate the current.
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Graphical
representation
Ohm’swith
Lawcurrent tranducer
Data Acquisition Knowledge
Base
Measureofcurrent
Ohm’s law describes the relationship between voltage (V), current (I), and resistance (R). If we know two out of
three of those, we can easily calculate the third via simple arithmetic. The diagram above illustrates the three
ways that Ohm’s law can be expressed:
V
I =
V
or V = I ⋅ R or R =
R
I
So if we know the voltage (drop) and resistance, we can calculate the current using I = V/R.
The shunt resistor should be chosen for the appropriate voltage range and current range, because too high of
resistance will affect the measurement, and will also waste energy and distort the measurement as the resistor
heats up. This energy loss is equal to:
I
2
⋅ R
In addition, the accuracy of the resistor is an important factor, since this directly affects the accuracy of the
measurement itself.
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Dewesoft DSIi-10A Current Shunt
Dewesoft offers several compact-size current shunts, each designed with a different resistor inside, intended to
measure different current ranges. These shunts have been engineered to have the least possible effect on the
circuit itself.
DSI adapters can be plugged into virtually all Dewesoft data acquisition devices. The isolated analog
inputs of Dewesoft amplifiers are an important factor in ensuring accurate measurements, since the shunt is
connected directly to the circuit being measured, and isolation between the circuit and the measuring system is
always important. Isolated inputs mean that you can place your shunt on the low-side or high-side of the circuit,
and not worry about a ground loop or common-mode measuring errors.
Check out Dewesoft's modern, digital data acquisition systems
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Considering Ohm’s law again and the interlocking nature of voltage, current, and resistance, it is absolutely clear
that a DAQ system must be able to make a very accurate voltage measurement and resistance measurement in
order to make an accurate current measurement.
IOLITE STG with built-in current shunt
Certain Dewesoft signal conditioners have a built-in shunt for measuring small currents. Take for example
the IOLITE and IOLITE modular data acquisition series STG signal conditioner. This module is a universal type,
meaning that it can handle a wide range of sensors and input types.
For example, it can handle strain gages in full-bridge, half-bridge and quarter-bridge configurations, voltages
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up to 50V, potentiometric sensors, and currents up to 20 mA. In addition, DSI series adapters can be used to
allow it to handle thermocouples, RTD sensors, LVDT position sensors, voltages up to 200V, currents up to 5A,
IEPE accelerometers, and more.
IOLITE DAQ system with various modules
The IOLITE 6xSTG features six differential inputs with over-voltage protection and sensor power from each of its
universal inputs and sample rates up to 20 kS/s/ch.
For current measurements, It has a built-in 50 Ω shunt resistor that can be applied in software, allowing
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engineers to measure current either up to 2 mA or 20 mA, user-selectable.
IOLITE chassis are available in an “IOLITEs” benchtop model, which accepts up to 8 multi-channel modules (seen
in the picture above). For permanent installations, there is the “IOLITEr” model, made for standard 19” rackmounting. This model has 12 slots for modules:
IOLITEr rack
Both IOLITE models feature dual-redundant power supplies for reliable performance in critical applications. They
also both have dual EtherCAT buses running in parallel. The primary bus is used for full-speed buffered data
acquisition to a PC computer hard drive running DEWESoft X software. The secondary bus is mainly used for the
real-time low-latency data feed to any 3rd party EtherCAT-based control system.
IOLITE is a unique DAQ system that bridges the worlds of real-time control and high-speed data acquisition,
combining them in one reliable instrument.
Measuring the electromagnetic field or flux of the current
Because current always generates a magnetic field that is proportional to the amount of current, we can
measure this field using a variety of sensors and thus measure the current.
Now let’s look at some of the most common current sensors and transducers, their basic working principles, and
how they are best used.
Hall effect sensor measurement
Hall effect sensors operate in principle by measuring magnetic fields. In 1879, twenty years before the electron
was discovered, American physicist Edwin Hall observed that when current flows through a conductor, the
electrons move in a straight line. However, when this conductor is exposed to a magnetic field, the Lorentz force
acts upon it, and the path of the electrons bends.
Furthermore, when the electrons are pushed more to one side of the conductor than the other, creating a
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potential difference between the two sides of the conductor. Hall observed that this potential difference was
directly and linearly proportional to the strength of the magnetic field.
This potential voltage difference, as measured between sides (or “planes”) of the conductor, is called the Hall
voltage.
The Hall effect has been adopted for thousands of applications, including proximity switches, motor speed
control circuitry, tachometers, LVDT sensors, and even fuel level sensors in automobiles. But we will focus on its
application specifically with current sensors.
Typical Hall Effect Current Sensor
Hall effect current clamps work by passing the conductor through their open core. They, therefore, provide a
non-contact method of measuring AC and DC currents. They require very little power, so they can be powered
directly from a SIRIUS preamplifier with a DSUB9 connector. No additional power supply is needed.
They are not as accurate as flux gate current clamps or zero flux transducers, but they offer a much wider
measuring range.
Hall effect sensors are available in both open-loop and closed-loop varieties. Closed-loop sensors add
compensation winding and enhanced onboard signal conditioning, making them more accurate than their
open-loop siblings.
DS-CLAMP-150DC
DS-CLAMP-150DCS
DS-CLAMP-1800DC
Type
Hall sensor
Hall sensor
Hall sensor
Range
200 A DC or 150 A AC
rms
290 A DC or 150 A AC
rms
1800 A DC or AC rms
DS-CLAMP-150DC
DS-CLAMP-150DCS
DS-CLAMP-1800DC
DC to 100 kHz
DC to 100 kHz
DC to 20 kHz
Accuracy
1 % + 2 mA
1 % + 2 mA
0 - 1000 A: ±2.5 % of reading ±0.5
A1000 - 1500 A: ±3.5 % of reading1500 1800 A: ±5 % of reading
Sensitivity
20 mV/A
20 mV/A
1 mV/A
Resolution
±1 mA
±1 mA
±1 mA
Overload
Capability
500 A DC (1min)
500 A DC (1min)
2000 A DC (1min)
TEDS
Fully supported
Fully supported
Fully supported
Dimensions
205 mm x 60 mm x 15
mm(Clamp opening d =
32 mm)
106 mm x 100 mm x 25
mm(Clamp opening d =
25 mm)
205 mm x 60 mm x 15 mm(Clamp
opening d = 32 mm)
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Dewesoft brand Hall Effect Current Sensors
The DS-CLAMP 150DC and 150DCS can be connected directly to a Sirius® LV or Sirius® HS-LV amplifier with a
DSUB9 connector. The DS-CLAMP-1800DC can be connected directly to all DEWESoft® amplifiers with DSUB9
connector (e.g. Sirius® LV-DB9).
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Typical Hall Effect Sensor from Dewesoft
Detailed Specifications about Dewesoft's current sensors:
Current Transducers
High-Accuracy Sensors for Current Measurement
Current transformer (CT) measurement
Current transformers (CTs) are used to measure alternating current (AC). They are inductive sensors that consist
of a primary winding, a magnetic core, and a secondary winding.
Essentially, a high current is transformed into a lower one using a magnetic carrier, thus very high currents can
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be measured safely and efficiently. In most CTs, the primary winding has very few turns, while the secondary
winding has many more turns. This ratio of turns between the primary and secondary determines how much the
magnitude of the current load is stepped down.
Typical Current Transformer
The AC detected by the primary winding produces a magnetic field in the core, which induces a current in the
secondary winding. This current is converted to the output of the sensor.
They are available as split-core configurations from Dewesoft, which allows convenient hook-up possibilities
since the circuit does not need to be altered in any way. You can simply open the jaws and release them around
the wire, making these AC current clamps especially convenient to use.
Dewesoft brand CT Current Transformers
DS-CLAMP-5AC
DS-CLAMP-15AC
DS-CLAMP-200AC
DS-CLAMP-1000AC
Type
Iron-Core
Iron-Core
Iron-Core
Iron-Core
Range
5A
15 A
200 A
1000 A
Bandwidth
5 kHz
10 kHz
10 kHz
10 kHz
Accuracy
0.5 % for 12A0.5
% for 5A1% for
500mA2% for
5mA
1% for currents of
1-15A2.5% for
currents < 1A
1% for currents of 100240A2.5% for currents of
10-100A3.5% for currents
of 0.5 - 10 A
0.3% for currents of 100A
- 1200 A0.5% for currents
of 10A - 100 A2% for
currents < 1A
DS-CLAMP-5AC
DS-CLAMP-15AC
DS-CLAMP-200AC
DS-CLAMP-1000AC
Phase
≤ 2,5°
≤3° for currents of
1-15A≤5° for
currents <1A
≤2.5° for currents of 100240A≤5° for currents of
10-100ANot specified for
currents of 0.5 - 10 A
0.7° for currents of 100A
- 1200 A1° for currents of
10A - 100 ANot specified
for currents of < 1A
TEDS
Fully supported
Fully supported
Fully supported
Fully supported
Sensitivity
60 mV/A
100 mV/A
10 mV/A
1 mV/A
Resolution
0.01 A
0.01 A
0.5 A
0.001 A
Overload
Capability
Crest Factor of 3
Crest Factor of 3
Crest Factor of 3
1200 A for 40 minutes
Dimensions
102 mm x 34 mm
x 24 mm(Clamp
Opening d = 15
mm)
135 mm x 51 mm
x 30 mm(Clamp
Opening d = 20
mm)
135 mm x 51 mm x 30
mm(Clamp Opening d =
20 mm)
216 mm x 111 mm x 45
mm(Clamp Opening d =
52 mm)
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Dewesoft Iron Core CT Current Transformer
Iron Core AC current sensors offer the convenience of requiring very little power, so they can be powered
directly from a SIRIUS preamp with a DSUB9 connector. No additional power supply is needed. They have
bandwidths from 2 Hz to 10 kHz (2 Hz to 5 kHz for the DS-CLAMP-5AC), and up to 10kHz for the other models
in the series). These clamps can be connected directly to all Dewesoft amplifiers with DSUB9 connectors (such as
the Sirius-LV).
Detailed Specifications about Dewesoft's current sensors:
Current Transducers
High-Accuracy Sensors for Current Measurement
Rogowski current sensor measurement
Rogowski sensors have the advantage of going around large cable bundles, bus bars, and irregularly shaped
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conductors in a way that regular clamps cannot.
They’re made for AC measurements, and their low inductance means that they can respond to fast-changing
currents. And their lack of an iron core makes them highly linear, even when subjected to very large currents.
They provide excellent performance when measuring harmonic content. A small integrator and power circuit are
needed and are built into each DS-FLEX sensor.
Typical Rogowski Coil Scheme
The number in their model name like 300, 3000 or 30,000 refers to the maximum amperage that they can read.
The final number refers to the length of the “rope” in cm. So for example, the DS-FLEX-3000-80 can read up to
3000 AAC and has a “rope” length of 80cm (i.e., 800 mm or 31 inches).
Dewesoft Rogowski coil “FLEX” current sensors
DS-FLEX-3000-17
DS-FLEX-3000-35
DS-FLEX3000-35HS
DS-FLEX-3000-80
DS-FLEX-30000120
Type
Rogowski coil
Rogowski coil
Rogowski
coil
Rogowski coil
Rogowski coil
Range
3, 30, 300, 3000
AACrms
3, 30, 300, 3000
AACrms
3000
AACrms
3, 30, 300, 3000
AACrms
30, 300, 3000,
30000 AACrms
Bandwidth
3A: 10 Hz to 10
kHzOthers: 10 Hz
to 20 kHz
3A: 10 Hz to 10
kHzOthers: 10 Hz
to 20 kHz
5 Hz - 1MHz
3A: 10 Hz to 10
kHzOthers: 10 Hz
to 20 kHz
3A: 10 Hz to 5
kHzOthers: 10 Hz
to 20 kHz
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DS-FLEX-
DS-FLEX-3000-17
DS-FLEX-3000-35
DS-FLEX-3000-80
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3000-35HS
DS-FLEX-30000120
Accuracy
<1.5 %
<1.5 %
<1.5 %
<1.5 %
<1.5 %
Coil
length
170 mm (Ø 45
mm)
350 mm (Ø 100
mm)
350 mm (Ø
100 mm)
800 mm (Ø 250
mm)
1200 mm (Ø 380
mm)
TEDS
Not supported
Not supported
Fully
supported
Not supported
Not supported
Dewesoft DS-FLEX-3000 Rogowski coil current sensor
These clamps can be connected directly to all DEWESoft® amplifiers with DSUB9 connectors (e.g. SIRIUSi LV).
Note that AC current is normally output as a true RMS reading, while DC current is output as a discrete value.
Detailed Specifications about Dewesoft's current sensors:
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High-Accuracy Sensors for Current Measurement
Zero Flux sensors measurement
A Zero Flux aka “FluxGate” current sensor is similar to a Hall effect current sensor, except that it uses a
magnetic coil instead of a Hall effect system. The higher accuracy that results makes these sensors ideally suited
for industrial, aerospace, and other applications that require high accuracy measurements. Zero Flux current
transducers measure current with galvanic isolation. They reduce the high voltage currents to much lower levels
which can be easily read by any measurement system.
Typical Zero Flux / FluxGate Sensor
They have two windings which are operated in saturation to measure the DC current, one winding for the AC
current and an additional winding for compensation. This kind of current measurement is very precise because
of the zero flux compensation. Why? Normally a magnetic core retains a residual magnetic flux, which ruins the
accuracy of the measurement. In zero flux transducers, however, this parasitic flux is compensated for.
Zero flux transducers are ideal when high AC/DC accuracy and/or high bandwidth (up to 1 MHz). They are very
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linear and have a low phase and offset error. But they are not so handy for making simpler measurements that
don’t require as much accuracy or bandwidth. For those applications, the current sensors in the previous
sections are recommended.
Flux technology extends this principle by using a magnetic coil as a detection element instead of a Hall element.
In addition, this is a closed-loop sensor, meaning that a secondary winding is used to eliminate offsets which
can lead to measurement inaccuracies. Flux sensors can handle even very complex AC and DC waveforms, are
generally regarded to provide excellent accuracy, linearity, and bandwidth, and are an essential part of
any power quality analyzer or power analyzer.
Learn more:
Power Quality Analyzer
Power Analyzer
Dewesoft FluxGate current clamps
Dewesoft offers several FluxGate current clamps that have been paired with our SIRIUS systems, including
mating and power cables. These FluxGate clamps must be powered by the SIRIUSi-PWR-MCTS2 power supply
unit.
DS-CLAMP-200DC
DS-CLAMP-500DC
DS-CLAMP-500DCS
DS-CLAMP-1000DS
Type
Flux gate sensor
Flux gate sensor
Flux gate sensor
Flux gate sensor
Range
200 A DC or AC RMS
500 A DC or AC RMS
500 A DC or AC RMS
1000 A DC or AC RMS
Brandwidth
DC to 500 kHz
DC to 100 kHz
DC to 200 kHz
DC to 20 kHz
Accuracy
±0.3 % of reading
±40 mA
±0.3 % of reading
±100 mA
±0.3 % of reading
±100 mA
±0.3 % of reading
±200 mA
Sensitivity
±10 mV/A
±4 mV/A
±4 mV/A
±2 mV/A
Resolution
±1 mA
±1 mA
±1 mA
±1 mA
Overload
Capability
500 A (1min)
1000 A DC
720 A DC
1700 A DC
TEDS
Fully supported
Fully supported
Fully supported
Fully supported
Dimensions
153 mm x 67 mm x
25 mm(Clamp
opening d = 20 mm)
116 mm x 38 mm x
36 mm(Clamp
opening d = 50 mm)
153 mm x 67 mm x
25 mm(Clamp
opening d = 20 mm)
238 mm x 114 mm x
35 mm(Clamp
opening d = 50 mm)
Detailed Specifications about Dewesoft's current sensors:
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Current Transducers
High-Accuracy Sensors for Current Measurement
Dewesoft Zero Flux current transformers
Dewesoft offers several Zero Flux current transformers that have been paired with our SIRIUS DAQ systems,
including mating and power cables. These sensors must be operated with the SIRIUSi-PWR-MCTS2 or SIRIUSirPWR-MCTS2 power supply units.
Dewesoft zero flux current transducers
IT-60-S
T-200-S
IT-400-S
IT-700-S
IT-1000-S
IN-1000S
IN-2000-S
Primary
Current Range
DCRMS Sinus
60 A
200 A
400 A
700 A
1000 A
1000 A
2000 A
Overload
Ability Short
Time (100 ms)
300 Apk
1000 Apk
2000 Apk
3500 Apk
4000 Apk
5000 Apk
10000 Apk
Max. burden
resistor (100 %
of Ip)
10 ohm
10 ohm
2.5 ohm
2.5 ohm
2.5 ohm
4 ohm
3.5 ohm
di/dt
(accurately
followed)
25 A/μs
100 A/μs
100 A/μs
100 A/μs
100 A/μs
100A/μs
100A/μs
Temperature
influence
< 2.5
ppm/K
<2
ppm/K
<1
ppm/K
<1
ppm/K
<1
ppm/K
< 0.3
ppm/K
<0.1
ppm/k
Output Ratio
100 mA
at 60 A
200 mA
at 200 A
200 mA
at 400 A
400 mA
at 200 A
1 A at
1000 A
666 mA
at 1000 A
1A at 2000
A
Bandwidth
(0.5 % of Ip)
DC ... 800
kHz
DC ... 500
kHz
DC ... 500
kHz
DC ... 250
kHz
DC ... 500
kHz
DC ... 440
kHz
DC ... 140
kHz
Linearity
< 0.002
< 0.001
< 0.001
< 0.001
< 0.001
< 0.003
< 0.003 %
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IN-1000-
T-200-S
IT-400-SMeasure
IT-700-S
IT-1000-S
Data IT-60-S
Acquisition Knowledge
Base
current with
current tranducer
S
IN-2000-S
%
%
%
%
%
%
Offset
< 0.025
%
0.008 %
< 0.004
%
< 0.005
%
< 0.005
%
< 0.0012
%
< 0.0012
%
Frequency
Influence
0.04
%/kHz
0.06
%/kHz
0.06
%/kHz
0.12
%/kHz
0.06
%/kHz
0.1
%/kHz
0.1 %/kHz
Angular
Accuracy
< 0.025°
+
0.06°/kHz
< 0.025°
+
0.05°/kHz
< 0.025°
+
0.09°/kHz
< 0.025°
+
0.18°/kHz
< 0.025°
+
0.09°/kHz
< 0.01° +
0.05°/kHz
< 0.01° +
0.075°/kHz
Rated isolation
voltage RMS,
single
isolationCAT
III, pollution
deg. 2IEC
61010-1
standardsEN
50178
standards
2000
V1000 V
2000
V1000 V
2000
V1000 V
1600
V1000 V
300 V300
V
X
X
Test voltage
50/60 Hz, 1
min
5.4 kV
5.4 kV
5.4 kV
4.6 kV
3.1 kV
4.2 kV
6 kV
Inner diameter
26 mm
26 mm
26 mm
30 mm
30 mm
38 mm
70 mm
DEWESoft®
Shunt
5Ω
5Ω
2Ω
2Ω
1Ω
1Ω
1Ω
Detailed Specifications about Dewesoft's current sensors:
Current Transducers
High-Accuracy Sensors for Current Measurement
Isolation and filtering
Isolation and filtering are critical aspects of any data acquisition instrument or test system.
Isolation
Isolation is especially critical when making direct measurements of the circuit, i.e. using the shunt method. The
isolation built into virtually all Dewesoft signal conditioners and preamplifiers is quite high and sufficient to
properly isolate the measuring system from the object under test.
This ensures the integrity of your measurements and protects against short circuits. In addition, it allows you to
place the shunt across either the low side or the high side of the circuit most of the time, providing additional
flexibility. Low-side shunt measurements are typically preferred because the relatively low current drop across
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Data Acquisition Knowledge Base
Measure current with current tranducer
the shunt means that a high impedance output is provided to the signal conditioner. But there are two
drawbacks to low-side measuring:
The shunt will not detect a fault if the resistor gets shorted to ground
Low-side shunts are not suitable for measuring multiple loads, or those which are turned off and on
independently.
Therefore, sometimes high-side shunt current measuring is sometimes required, using Dewesoft’s differential
and isolated preamplifiers.
Filtering
Filtering is another critical function of any high-performance data acquisition system. Electrical noise and
interference are an everyday challenge for test engineers. It can be induced by fluorescent lights, other electrical
equipment, and countless other sources.
Dewesoft signal conditioners provide powerful low-pass filtering in hardware that allows engineers to suppress
frequencies above a certain level. And in DEWESoft software, a broad palette of low-pass, high-pass, band-pass
and band-stop filtering is available - and can be applied in real-time or after the measurement is done.
Learn more:
Voltage Measurement in Data Acquisition Applications
In this article, you'll learn what voltage measurement is, which voltage sensors and transducers are
available today, and the basics of voltage measurement.
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Measure current with current tranducer
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What is a sensor
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Data logger vs DAQ system
Replacing chart recorders with digital DAQ system
What is a strain gauge
Strain gauge applications
How to measure weight with load cells
What is a thermocouple
Voltage measurement
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Measure current with current tranducer
Types of current sensors
Current transducers vs current transformers
Measure current with current tranducer
What is an inertial navigation system
Measure with RTD sensors
Measure with LVDT sensors
How to measure torque
Sound and noise measurement
Test and measurement standards
What is a signal amplifier
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Measure current with current tranducer
AC/DC Current Transducer
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Correlating power with vibration
DAQ Cooks Up the Perfect BBQ
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Pratt Miller’s test bench control
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