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The PP179 and PP266 current clamps are ideal for use with a PicoScope automotive oscilloscope to display starter current waveforms, charging currents and for performing quick compression tests (see waveforms below).
The current clamp can measure up to 600 A (AC or DC). In use there is no need to break into the circuit or disturb the isolation as the opening jaws simply clamp around the current carrying conductor. No electrical contact is required.
PP179 - 600 A clamp with 4 mm connectors
PP266 - 600 A clamp with BNC connector
Connecting the Current Clamp
The PP179 current clamp is supplied with 4mm (banana) plug type connectors so can not be plugged directly into the PicoScope. To connect to the PicoScope we recommend the use of the TA000 BNC to 4mm test lead, alternatively the MI078 BNC to 4mm plug adaptor can also be used.
The PP266 current clamp features a BNC connector and can be plugged directly into the PicoScope.
Once connected to the PicoScope, switch the current clamp on (green LED should light) and then clamp the jaws around the current carrying conductor as shown.
Advice for Low Current Measurement
Although the current clamp is designed primarily for measuring ‘high’ currents, the high resolution and flexible input ranges of the PicoScope PC Oscilloscope allow much lower currents to be measured than with most automotive oscilloscopes.
To make measurements at low currents, the following advice may help:
- Before connecting the clamp, use the zero adjust wheel to trim out any offset
- If possible, loop a number of turns of the cable to be measured through the jaws. The actual current is the measured value divided by the number of turns
- At low currents, noise pickup from ignition / injectors etc may be a problem. Keep the clamp and its connecting cable as far away from the noise sources as possible
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