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TTi Iprober 520 Positional Current Probe

 

Made in the UK

3 Year Warranty

TTi Iprober 520
         
4 of 5
Positional Current/Field Probe DC-5MHz 5mA-20A

Features

  • Observe and measure current in a PCB track
  • Make measurements via non-contact probing
  • Suitable for observation and measurement of current in component leads & ground planes as well as PCB tracks
  • Wide dynamic range of 10mA to 20A pk to pk
  • Wide bandwidth of DC to 5MHz
  • Low noise equivalent to <6mA rms at full bandwidth
  • Minimal disturbance to circuit conditions through very low insertion impedance and stray capacitance
  • Safety rated to 300V Cat II (600V Cat I)
  • Suitable for connection to any oscilloscope
  • High accuracy general purpose H-field probe
  • Convertible into closed magnetic circuit current probe
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TTi Iprober 520 Positional Current Probe

TTi Iprober 520 Positional Current Probe

         
4 of 5
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Product Information

Positional Current Probe


TTi_Iprober_520_des_1

Wide bandwidth of DC to 5MHz

Current measurement from insulated probing of conductor

Safety Rated to 300V Cat II (600V Cat 1)

Suitable for observation and measurement of current in PCB tracks, component leads and ground planes

High Accuracy

Wide dynamic range of 10mA to 20A peak to peak

 

TTi Iprober 520 Positional Current Probe


TTi_Iprober_520_des2_tn

The Aim I-prober 520 positional current probe is unlike any other current measurement device available.

Calibrated measurement of current normally requires the current to be passed through a closed magnetic loop. Typically this is done using some form of split clamp device. Whereas this is suitable for individual wires, it is of no use for measuring current in PCB tracks.

The I-prober 520 is a compact hand-held probe which is used with an oscilloscope. By placing the insulated tip of the probe onto a PCB track, the current flowing in the track can be observed and measured.

The I-prober 520 positional current probe is unlike any other current measurement device available.

Calibrated measurement of current normally requires the current to be passed through a closed magnetic loop. Typically this is done using some form of split clamp device. Whereas this is suitable for individual wires, it is of no use for measuring current in PCB tracks.

The I-prober 520 achieves something radically new. It can observe and measure currents in PCB tracks and other conductors where conventional current probes can’t be used.  This includes captive wires into components, the legs of integrated circuits, and PCB ground planes.

The I-prober 520 achieves something radically new. It can observe and measure currents in PCB tracks and other conductors where conventional current probes can’t be used. This includes captive wires into components, the legs of integrated circuits, and PCB ground planes.

Conventionally, current can only be measured by either breaking the circuit to insert a shunt resistor, or by surrounding the conductor by a loop of magnetic material as in a standard current probe. The I-prober 520 enables currents, from dc up to 5MHz, to be observed and measured simply by placing its insulated tip onto the conductor.
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Aim I-prober 520 - a innovative and flexible measurement tool

The I-prober 520 in use
The magnitude of the signal from a positional current probe is critically related to its position relative to the conductor. The size of the conductor (e.g. the width of a PCB track) also has a significant effect.

This means that the sensitivity of the I-prober has to be adjusted to match the track width when quantitative measurements are required. A calibrator within the control box enables sensitivity adjustment in conjunction with a calibration graph.

The measurement result will also include other field effects present at the tip of the probe and not just that coming from the current through the conductor. This may include DC effects from adjacent magnetised components and from the earths magnetic field, plus AC effects from transformers and other field radiating sources.

Current in adjacent tracks, or tracks on the opposite side of the PCB will also affect the measurement. There are solutions to these potential problems. The unwanted DC can be nulled out by observing the measurement without power to the circuit, whilst AC interference can be attenuated using bandwidth filters. The I-prober control box includes a wide range DC offset control and switchable filters.

Nevertheless, the use of the I-prober 520 requires interpretation based upon a proper understanding of circuits and systems. It is a tool for the professional engineer.

Closed-loop current measurement
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Whereas the primary purpose of the I-prober 520 is as a positional current probe, the are many circumstances where current measurements can be made in the conventional way by enclosing the conductor.

To increase its overall usefulness, the I-prober 520 is supplied with a clip-on toroid assembly which converts it into a closed magnetic circuit probe for measuring current in a wire.

The toroid is open until the probe is attached, allowing insertion of the wire without disconnection. The wide bandwidth, dynamic range and low noise of the probe are retained but higher accuracy, repeatability and unwanted field rejection are achieved.
 
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Minimal circuit disturbance

With many high frequency switching circuits and high bandwidth signal paths, inserting even a short loop of wire into the track path can change the inductance sufficiently to alter the circuit performance. Unlike a conventional current probe, the I-prober 520 has an extremely low insertion impedance and negligible stray capacitance. This enables current observations and measurements to be made without disturbance to the circuit.
 

Safe for higher voltage use

The I-prober 520 is safety rated to 300V CAT 11 (600V CAT 1). This enables it to be used on circuits with direct connection to AC line at up to 300V rms, and on isolated circuits at voltages up to 600V rms. A finger guard is incorporated to maintain user safety at higher voltages.

The probe can be used to measure high temperature PCB tracks and component leads up to 120oC continuous or 150oC short term.

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Measurement of electromagnetic field

The very small size of the field sensor within the I-prober 520 gives it some unique capabilities when used to measure magnetic fields.

The variation of field with position can be accurately determined enabling the precise source of fields to be located and their variation in space measured. A switch on the control box re-scales the output voltage to measure in Teslas or in amps per metre.

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What's In The Box

  • Current probe with fixed cable to control box.
  • Control box/calibrator with fixed output cable with BNC plug.
  • Clip-on toroid assembly.
  • Universal power supply including interchangeable plugs for UK, Europe, USA and Australia.
  • Printed Instruction Manual (multi language).
  • Laminated card showing calibration graph.
  • Fitted case as shown.

Specifications

General Specifications (All Modes)
Output Signal
Maximum Output ± 10V .
Oscilloscope Input Suitable for an input impedance of 1MW in parallel with < 30pF.
Trace Position Wide range DC offset control within control box.
Safety
Max. Circuit Voltage 300V Cat II (on AC line circuits).
600V (on uncategorised secondary circuits inside equipment).
Max. Tip Temperature 150°C maximum allowable temperature at probe tip.
Conformance Complies with EN61010-1 & EN61010-031
HF Performance (bandwidth switch at Full)
Propagation Delay 60ns typical (to 10%).
Bandwidth DC to 5MHz (small signal)
Slew Rate 15A/µs (equivalent).
Overload Indication
Indicator Threshold Indicator LED within control box will light if output voltage exceeds ± 10V or if large magnetic fields cause the system to saturate.
Power Source
Power Supply 5.2V at up to 5 watts from AC line adaptor (supplied).
Mechanical
Probe Dimensions 155mm x 38mm x 28mm max; 2.8mm x 1.8mm at tip
Cable Length 2m from probe tip to output BNC
EMC
Conformance Complies with EN61326
MAGNETIC FIELD MEASUREMENT (Mode = Field)
Scaling Factor 250µT (or 200A/m) per Volt.
Accuracy and Linearity ±3%
Maximum Field ±2·5mT (2000A/m).
CURRENT MEASUREMENT USING TOROID (Mode = Wire)
Scaling Factor 1 Amp per Volt.
Accuracy and Linearity ±5%
Current Range ±10mA to ±10A (DC + peak)
Max. Wire Diameter 3.5mm (unbroken) or 6mm (end fed)

TTi Iprober 520 Product Specifications Summary:
(for full specs please see the full specs tab or the data sheet)

Accessories/Probes/Oscilloscope Probes/Oscilloscope Current Probes Template

Type (Probe)AC/DC
Maximum Bandwidth5 Mhz
Maximum Current What's This?20 A
Minimum Current10 mA (10000 uA)
CAT Voltage RatingI, II
Safety Voltage Rating300V, 600V

Test Equipment General Attributes

Unique FeaturesNo requirement to break or surround the conductor
Observe and measure currents in PCB tracks directly
Minimal disturbance to circuit conditions through very
low insertion impedance and stray capacitance
Useable in confined and difficult to access spaces
Measures current into surface mount components,
IC legs and short component leads
Can observe currents flowing within ground planes
Useable on high voltage conductors and in high
temperature areas
Warranty3 YEARS
Warranty DetailsFor all Aim-TTi products purchased after 1st June 2013, the warranty can be extended to three years from the date of purchase.
Customers can extend the standard 1 year warranty on their product to three years by registering within 3 months of purchase. Registration is free and will ensure that products purchased from our worldwide distributors are warranted from the purchase date, rather than the date of manufacture, in order to fully utilise the warranty period.
Up to five products can be registered simultaneously using the form.
Country of OriginUnited Kingdom

Reviews

Q & A

Q: Are these probes compatible with all Tektronix and KeySight scopes or is the compatibility limited?
A: The I-prober is intended for use with all scopes with a standard 1MΩ input impedance.   


Q: Does the Iprober 520 come calibrated from the factory with a certificate including the data?
A: They do not come with a calibration certificate as standard, this needs to specified at the time of purchase as it is an additional accessory. 
 

Reviews

TTi Iprober 520 Customer Reviews

2 Reviews
5 stars
 (1)
4 stars
 (1)
3 stars
 (0)
2 stars
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1 star
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Average Customer Review
         
4 of 5
2 customer reviews
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Product: TTi Iprober 520
          5.0
 
mike.vc
Location: Valley Center CA USA
Recommended: Yes

Current Probe with added features

Current probes able to measure DC current and have some reasonable bandwidth are not cheap. I like this probe for its price point and added features. It measures DC current using the toroid attachment within the specified accuracy of /- 5%. I saw 3% accuracy measuring 800mA DC load. The added feature of being able to make qualitative measurements without breaking a trace and adding a wire loop was nice for quick analysis of currents without damaging the PCB. Having the 5Mhz bandwidth allow for analyzing currents in most boost / buck regulators. Using the positional current probe feature to measure current through a trace, you must follow the instructions in the manual to get the best performance out of the probe. Overall I feel it was money well spent.
0 out of 0 found this review helpful. Did this help? Yes No
 
Product: TTi Iprober 520
          4.0
 
G Yundt
Location: USA
Recommended: Yes

TTi Iprober Contact Current Sensor/Probe

The TTi Iprober is a medium to high quality product. Used as a general purpose current probe around a wire with the clip it measures accurately and with decent bandwidth. Using a function generator square wave the rise time was in the 50 nSec range implying 7 MHz bandwidth which is comfortably above the 5 MHz bandwidth spec.

It is a little sensitive to the position of the wire in the clip. With 1 Adc flowing in an AWG #22 wire I could see on the order of 2-5% shifts in the measure level by moving the wire around in the hole. Just the wire location not the angle of the probe itself.

When used as a contact probe to see the current in a PC board trace it does work but it is a bit finicky. First you have to calibrate the probe which is easy, quick but in this mode the Earth's magnetic field will show measurable dc offsets that change with the orientation of the probe. So, you have to be precise in holding the orientation while taking a measurement.

All in all we have used it for a couple of weeks and the engineers in the lab like it.

Compared to a "standard" high bandwidth Tektronix current probe it does have performance issues. As a general purpose medium bandwidth current probe it is OK. But,the contact probe functionality and the magnetic field measurement capability make it unique.

Overall a well equipped lab that has multiple standard current probes could ;use this probe for those special cases. But, I would not recommend this probe as the only current probe for a lab.
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