• on Test & Measurement
  • Published in issue 9/2010 on page 60
About the article

High-voltage Probe

Home made and differential, too

High-voltage Probe
Measuring small differences between high voltages normally calls for special ‘differential’ test probes, which do not come cheap. But you won’t bust your budget on expensive components building the DIY solution described here and you’ll pick up plenty of practical know-how in the process.
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Characteristics

- Differential attenuation switchable in two stages (–20 dB/–40 dB)
- Bandwidth 1 MHz, switchable limit at 500 kHz
- Maximum input voltage ±1000 V (peak value)
- Maximum output voltage ±10 V (at min. terminating impedance 1 kOhm)
- Common-mode suppression 55 dB at 6 kHz, 35 dB at 600 kHz


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