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X10 / X100 active differential probe

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Differential Probe X10/X100


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The ADF25A (MI053) is an active differential probe for use with the Pico range of virtual instruments. The probe permits the measurement of signals which are not referenced to earth using a conventional earthed oscilloscope. This enables mains voltages to be tested. It is possible to measure and observe the waveforms of three phase supplies or the gate / control signals of semiconductor circuits. It is ideal for investigation of motor speed controls, uninterruptible power supplies, switch mode power supplies and process controllers.
The probe comprises a dual differential balanced input circuit with switch selectable attenuation of 10:1 / 100:1. The output of the attenuator is fed into a differential amplifier which produces a single ended output for feeding into the ADC unit. The output is fed to the unit via a coaxial cable terminated with a BNC plug.
 
Attenuation ranges 10:1 / 100:1
Input Voltage ±70 V d.c. Inc Pk (10:1)
±700 V d.c. Inc Pk (100:1)
Max. Differential a.c. @ 10:1 or 50V r.m.s. Cat III ±700V d.c. Inc Pk
a.c. @ 100:1 or 500V r.m.s. Cat III ±2400V d.c. Inc Pk
Bandwidth d.c. -25MHz (-3dB)
Accuracy ±2%
Rise time 14ns
Input Impedance 4MΩ / 5.5pF each side to ground
Output voltage ±7 (Minimum 2KΩ load
Power requirements 4 X AA cells or 6V 60mA d.c. mains adaptor
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