Measurement probes
Oscilloscope probes enable the measured signal to be faithfully transmitted to the instrument without altering its form or dynamics. They determine the accuracy, bandwidth and safety of measurements. Their input impedance, typically 10 MΩ / 10 pF, limits the load on the circuit under test, while their bandwidth varies from 20 MHz to over 4 GHz depending on the model. In R&D, they are used to characterise high-speed analogue or digital signals; in production, they are used to check power supply, control or synchronisation signals. The probes are available in passive, active, differential, current or high-voltage versions, adapted to each type of measurement. BNC, SMA or TekProbe connectors ensure compatibility with most modern oscilloscopes. Insulated models guarantee safety in accordance with IEC 61010 and CAT II / CAT III standards.
It is an essential accessory for guaranteeing the fidelity, accuracy and safety of oscilloscope measurements.
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N2862A
KEYSIGHT / AGILENT / HP
Passive 10:1 probe, 150 MHz, 1.2 m for accurate measurements.
10074C
KEYSIGHT / AGILENT / HP
Passive 150 MHz probe with retractable tip for hands-free measurements.
P2220
TEKTRONIX
200MHz passive voltage probe with selectable attenuation, ideal for Tektronix oscilloscopes.
AMPFLEX A193
CHAUVIN ARNOUX
Capteur de courant flexible 100 mA–10 kA AC, Ø100/190 mm, CAT III/IV
N2863B
KEYSIGHT / AGILENT / HP
Passive oscilloscope probe, 300 MHz bandwidth and 10:1 division ratio.
P6138A
TEKTRONIX
Sonde de tension 400 MHz, 10X, 300V, CAT II pour des mesures précises.
1158A
KEYSIGHT / AGILENT / HP
Sonde active 4GHz pour oscilloscope INFINIUM avec temps de montée de 88ps.
1157A
KEYSIGHT / AGILENT / HP
Sonde active 2,5GHz avec temps de montée rapide et faible capacité d’entrée.
N7007A
KEYSIGHT / AGILENT / HP
Passive 10:1 2 m probe, 400 MHz bandwidth, for extreme temperatures.
HFP3500
TELEDYNE LECROY
Versatile, lightweight active probes, ideal for high-speed signals.
concrete questions about Measurement probes
01
What is an oscilloscope probe used for?A probe is used to connect a circuit to the oscilloscope while preserving signal shape, correct impedance and user safety. It adapts the measurement to avoid disturbing the system under observation and to guarantee a faithful representation of the voltages.
02
What is the difference between a passive and an active probe?Passive probes (often 1:1 or 10:1) are robust, versatile and suitable for most general measurements. Active probes have a built-in amplifier: they offer a wider bandwidth, low capacitive load and are suitable for fast or load-sensitive signals.
03
How do I choose the attenuation ratio (1:1, 10:1, 100:1)?The attenuation ratio determines the maximum measurable voltage and the effect of the probe on the circuit. A 10:1 ratio is common for most electronic signals. 100:1 ratios are used for high voltages, while 1:1 ratios are suitable for low voltages requiring minimal load.
04
Why are bandwidth and input capacity critical?Insufficient bandwidth attenuates high frequencies and distorts fast edges. Too high an input capacitance can alter the behaviour of the circuit being measured, particularly on fast signals. Active or high-frequency probes are preferred for RF or fast digital applications.
05
Do the probes need to be compensated before measurement?Yes for passive 10:1 probes. Poor compensation causes overshoot or rounding in square wave signals. Most oscilloscopes have a dedicated test point for compensation, which can be adjusted in a matter of seconds using a screw or a built-in adjuster.
