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30/300/3000 A AC 3-phase flex current probe, BNC connector

The TA325 is a 3-phase AC current probe utilizing the Rogowski coil principle, used to measure AC current up to 3000 A when used with oscilloscopes, recorders or data loggers. The flexible probe allows current measurements on hard-to-reach conductors. 

Rogowski coil technology has a couple of advantages over CT (current transformer) technology: when measuring multiple phases, the phase difference is small and predictable for higher frequency harmonic analysis applications; also, Rogowski coils do not have magnetic materials to saturate and so have excellent linearity. 

The probes provide a 3 V full-scale AC output proportional to the current being measured with three selectable ranges: 30 A, 300 A and 3000 A. 

When using the TA325 with a PicoScope 4444 differential scope, ensure that you purchase three TA271 D9-BNC adaptors. These can be found under the Accessories tab on this page.

Image taker overhead showing coiled TA325 current probe with its 3 BNCs and 3 coils and integrator.
In stock. Available for despatch.
Title Language Issue Size Updated All products All languages All documents Status
TA325/TA326 AC current probes user’s guide english
1 2 MB Jan 18 2017 english
TA325 and TA326 Flex Current Probes EU Declaration of Conformity english 1 291 KB Mar 30 2017 english open

Accessories for the 30/300/3000 A AC 3-phase flex current probe, BNC connector

Product Price Quantity
D9 to single BNC adaptor
TA325 and TA326 flex current probe specifications
Measuring ranges 30 A / 300 A / 3000 A AC
Output sensitivity (AC coupled) 100 mV / 10 mV / 1 mV per A
Accuracy (45 to 65 Hz) ±1% of reading ±0.1 A 30 / 300 A
±1% of reading ±1 A 3000 A
Minimum load 100 kΩ for specified accuracy
Frequency range 10 Hz to 20 kHz (–1 dB)
Phase (45 to 65 Hz) < ±1°
Position sensitivity ±2% of reading
External field ±0.25% of range with cable > 100 mm from the probe
Noise 80 mA RMS 30 A
400 mA RMS 300 A / 3000 A
Temperature coefficient ±0.1 % /°C
Power supply Two AA MN1500 LR6 alkaline batteries or an external power supply (+3 V / 100 mA)
Battery life 1000 hours typical (TA325)
2000 hours typical (TA326)
External power Via 2.1 mm (0.08") mini power connector
Low battery Indicated by an orange LED
Overload Indicated by a red LED
Material ARNITE T06-200SNF, UL94 V0
Degree of protection IP40
Dimensions 110 (L) x 65 (W) x 23 (D) mm
Output connection 0.5 m coax cable with 3 shrouded BNC connectors
Probe length 610 mm (24”), double-insulated
Probe diameter 9.9 mm (0.39”)
Output cable 2 m (78.7”), probe to integrator
Material Alcryn 2070 NC, LATI LATENE 7H2W V0
Degree of protection IP65
General characteristics
Operating temperature –20 °C to +65 °C (–4 °F to +149 °F)
Storage temperature –40 °C to +75 °C (–40 °F to +167 °F)
Operating humidity 15% to 85% (non-condensing)
Safety standards EN 61010-1
EN 61010-2-032
EMC EN 61326-2-2
Pollution Degree 2 (probe and integrator)
30 V maximum between output and ground
RoHS and WEEE compliant
Rated for continuous use