The Testec is an active differential oscilloscope probe that enables a conventional oscilloscope to display and measure in-circuit waveforms that are referenced to high common-mode voltages. It is capable of safely measuring differential voltages up to ±1000VAC and 1400VAC/DC. It supports bandwidths up to 25MHz.

This oscilloscope probe can measure signals below 70V by selecting the attenuation ration to 1:20 to obtain higher resolution and less noise ratio. When measuring signals up to 1400V dc change the attenuation ratio to 1:200.

Bandwidth is DC to 25MHz
Attenuation is 1:20/1:200
Rise time is 14ns
Differential mode input voltage is 1:20 ±140V (DC+peak AC) or 140Vrms 1:200 ±1400V (DC+peak AC) or 1000Vrms
Input impedance is 4Mohm ll5.5pF each side to ground
Common mode voltage range is 1:20 and 1:200 ±1400V (DC+peak AC) or 1000Vrms
Non-destructive Max input voltage is 1:20 and 1:200 ±1400V (DC+peak AC) or 1000Vrms
CMRR (typical) is -80dB at 50Hz and -60dB at 20kHz
Offset (typical) is <±5mV
Noise (typical) is 0.7mVRMS
4 x AA batteries
Dimensions (L x W x H): 170 x 63 x 21 mm
Length: BNC cable 950mm, Input leads 450mm

Oscilloscope probes are used with oscilloscopes to enable the signals on the circuits being tested to be connected to the oscilloscope so that signals can be measured. These oscilloscope probes can be found in:

Performance conversion
Inverters
Motor speed indicators
Switch mode power supplies