Comparison of the division ratios measured on different high voltage pulse calibration systems Page: 3 of 7
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O. T. Fundingsland describes the fundamentals of pulse voltage measurements via
parallel RC dividers . General assumptions to allow pulse measurements are discussed.
For measuring pulse voltages, two types of dividers are common: resistive and capacitive.
Fundingsland considers both.
Resistive dividers are normally 2 noninductive resistors connected in series. The resistors
are designed to have small reactive components over the frequency range of use. A short
coaxial cable terminated in 50 Q connects the resistive divider to a digital recorder. In
Figure 1, Rhi and Rlo form the resistive divider. The 50 0 resistor Rm at the digitizer
input eliminates reflections. Thevalue of Rm normally influences the divider ratio. The
resistive divider ratio, which is typically in the range 1000 to 10,000, is:
RioRhi + RmRhi + RloRm Rhi
RR RloRm RloIRm
When Rm is external to the digitizer, the input resistance of the digitizer Rdig is high and
normally 1 M2. The output resistance of the pulse forming network is Rs. If the value of
Rs is unknown, proper measurement of the high voltage requires that Rs is small relative
Rio Rm Rdigy ignzer
Figure 1. Pulser with Resistive Divider and Digitizer
Capacitive dividers are a pair of capacitors connected in series. The smaller capacitor
connects to the high voltage. Capacitive dividers normally contain an internal 50 Q
resistor to limit reflections: In Figure 2, Chi, Clo and Rm form the capacitive divider.
Coaxial cable with a low capacitance per length rating connects the divider to a digital
recorder. The capacitance of this coaxial cable influences the division ratio. The
Clo +Cc +Chi
capacitive divider ratio is: Rc Chi , where Cc is the capacitance of the cable.
The input impedance of the recorder is high and normally 1 MQ. The main advantage of
capacitive divider over resistive dividers is a higher input impedance.
1998 NCSL Workshop & Symposium 1:34 PM PAGE 2
4/20/98 13 MPG
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Solomon, O. Comparison of the division ratios measured on different high voltage pulse calibration systems, article, April 1, 1998; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc712223/m1/3/: accessed April 26, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.