Adaptors and Oscilloscope Attenuators
With high bandwidth and fault-protection, the 10:1 oscilloscope attenuator has been designed to allow fuel injector and primary ignition waveforms to be measured using PicoScope oscilloscopes.
The PICO-TA197 is a passive 10:1 attenuator. This means that a 10 V signal at its input will appear as a 1 V signal on the output. The PICO-TA197 allows voltages of up to 400 V to be measured. Note the PICO-TA917 attenuator is designed for ground referenced signals only as it only attenuates the signal path and not the ground path.
The PICO-TA197 attenuator also increases the input impedance of the oscilloscope from 1 MΩ to 8 MΩ and can also be used when measuring the output of high-impedance sensors such as piezo knock sensors where connecting an automotive scope can attenuate the signal or induce a fault code.
Note : When using a PicoScope 4225 or 4425 oscilloscope the oscilloscope attenuator may not be needed for measuring injectors because the voltage spike is usually under 200 V (however, we recommend that you always use an attenuator when probing inductive circuits because of the unpredictablity of back EMF). It will always be required however when using older generations of PicoScopes which only measure to 50 V or 100 V. The 10:1 attenuator is an improved version of the 20:1 attenuator previously available from Pico.
|Input impedance||8 MΩ|
|Input capacitance||27 pF|
|Bandwidth||20 MHz (–3 dB)|
|Max. input||400 V|
The PICO-TA197 is designed for measuring automotive signals such as fuel injector and primary ignition voltages (nominally 6, 12 or 24 volts). This attenuator must not be used to measure mains voltages, secondary ignition or other hazardous voltages.
Fuel injector and primary ignition signals contain short duration high voltage spikes “inductive kicks”. We therefore recommend (especially when using the older Automotive Oscilloscopes) the use of two ground connections between the oscilloscope and the vehicle under test. One ground connection is made using the measurement test lead. A second ground lead should be connected between one of the other BNC connectors on the oscilloscope and a secure ground point on the vehicle such as the negative terminal of the battery. Misconfiguration and/or failure to follow these warnings may cause damage to the product and/or computer and could cause injury to yourself or others.
BNC to 4mm Adaptor
The BNC to 4 mm adapter connects two 4 mm (“banana”) plugs to a BNC socket. If you have a sensor such as a current clamp with 4 mm plug outputs, for example, this adapter allows you to plug it into a PicoScope Automotive Oscilloscope with a BNC input. The 4 mm sockets and BNC plug are fully shrouded for safety.
- Length: 63mm
- Width: 34mm
- Height: 18,5mm
Have a look at our Ignition Accessories.