Cal Test CT3681 Rental - 7kV Differential Probe 70MHz

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Cal Test 7kV Differential Probe

  • Up to ±7 kV differential and common mode
  • 70 MHz bandwidth (-3 dB) & High accuracy (±2%)
  • Selectable attenuation settings of 100x/1000x
  • Ideal for Surge Pulse Verification 

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Verification/Monitoring Devices



Differential probes allow safe, accurate measurement between two voltage points where neither point is referenced to ground. The CT3681 and CT3683 both offer a 70 MHz bandwidth and can test up to ±7 kV (DC + AC peak). Compatible with oscilloscopes from all major manufacturers, the probes can be battery operated, powered by a universal adapter (optional), or powered by USB power lead (optional) if the oscilloscope is so equipped

Data Sheet


Electrical Specifications

CT3681 & CT3683


Bandwidth (-3dB)

70 MHz (driving 1 MΩ oscilloscope input)

Rise Time (10%- 90%)

5 ns

Attenuation ratio




CMRR (typical)

-80 dB @ 50 Hz
-60 dB @ 20 kHz

Maximum Differential
Input Voltage
(DC + AC peak)

±700 V @ 100x attenuation
±7000 V @ 1000x attenuation

Maximum Common
Mode Input Voltage
(DC + AC peak)

±700 V @ 100x attenuation
±7000 V @ 1000x attenuation

Absolute Maximum
Rated Input Voltage
(each side to ground)

5000 Vrms CAT I

Mechanical Characteristics 



500 g (probe only)


202 x 83 x 38 mm

BNC Cable

 90 cm

Input Leads

60 cm each

CT3681 Probes

1000 V, CAT III, 20 A

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