The introduction of digital recording system in the high-voltage measuring technique has a great influence on the measuring technique and the evaluation procedures. The formerly used analogue recording instruments were developed for high-voltage measurements and in particular for impulse measurements under very noisy conditions or in other words for high electromagnetic interferences. One of the best measures against the electromagnetic interference was the high signal-to-noise ratio, reached by a high signal voltage level up to 1,500 V for impulse voltage measurements. This high signal level leads also to a high deflection level of about 100 V/cm and requires no amplifier within the analogue oscilloscope.

Chapter Contents:

• 18.1 Introduction
• 18.2 Requirements on the recording device
• 18.3 Requirements on the evaluation software
• 18.4 Application of digital recording systems
• 18.4.1 DC and AC voltage measurements
• 18.4.2 Impulse voltage or current measurements
• 18.4.3 Partial discharge measurements
• 18.5 Application examples of evaluation procedures
• 18.6 Conclusions
• References

Inspec keywords: recorders; electromagnetic interference; voltage measurement; digital instrumentation

Other keywords: high-voltage measuring technique; signal-to-noise ratio; noisy conditions; digital measuring technique; electromagnetic interferences; impulse voltage measurements; digital recording system

Subjects: Computerised instrumentation; Display, recording, and indicating instruments; Voltage measurement; Display, recording and indicating instruments; Electromagnetic compatibility and interference