Prema DMM 5017 - Measurement of AC Voltage; Frequency, Period; RMS to DC Converter

8 Construction
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8-5
8.3 Measurement of AC Voltage
An attenuation path was devised for the measurement of AC Voltages, which pro-
vides high band widths and sufficient measurement speed.
Diagram: Measurement of AC Values
Frequency, Period
Frequency and Period are primarily measured through an impulse-counting circuit.
Even small frequencies can thereby be measured through the period length, with small
gate times.
RMS to DC Converter
AC Voltage measurements are effected through a highly precise RMS to DC Con-
verter. This converter determines a proportional DC Voltage from the AC Voltage
being measured, equivalent to the true RMS value of the signal.
Front or
Rear Connectors
or Scanner
Reference PLL
Micro-
con-
troller
Relays Control
(PREMA-ASIC)
Integr. Converter
(PREMA-ASIC)
AC
Attenuator
RMS to DC
Converter
Frequency
Measurement
OP2
Current
Shunts