Kikusui PFX2000 Series, Руководство по эксплуатации

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PFX2000 Appendix A-1
Appendix
A.1 Measurement Function of the Charge/
Discharge Power Supply Unit
This section describes the method and the characteristics of voltage and current
measurement on the charge/discharge power supply unit.
A.1.1 Overview
This unit is equipped with a 26-kHz high-speed A/D converter with 24-bit resolu-
tion for making measurements. This allows high-speed and high-accuracy measure-
ments at high resolution.
In addition, the PFX2021 is equipped with a voltage-to-frequency converter (VF
converter) for measuring pulse charge/discharge currents which enables capacity
calculations at high accuracy even during pulse charge/discharge operation.
A.1.2 Measurements during Normal Operation
■
High-speed conversion and averaging
To obtain highly accurate measurement results using the high-speed A/D converter
that performs one conversion in 38
µ
s, this unit performs six consecutive conver-
sions as shown in Fig. A-1 and uses the average value as the measurement result.
This conversion method applies both to voltage and current measurements.
Fig.A-1 Analog-to-Digital Conversion Method
38
µ
s
One conversion Voltage or current value
Conversion
result
1) 2) 3) 4) 5) 6)
≈ 230 µ s
Time needed to make one measurement
Measurement result = 1)+2)+3)+4)+5)+6)/6