Hioki SM7860 Series, Instruction Manual

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50
Basic Specifications
0.1
1.0
10.0
100.0
10 100 1000
Capacitance [µF]
Charging interval [ms]
Applied voltage 250 V
Applied voltage 500 V
Applied voltage 1000 V
Figure 2: Charging Interval by Applied Voltage and Capacitance
(SM7860-52, -54, -56, -62, -64, -66)
Graph description and operating precautions
Since the SM7860 is designed to be embedded in an automated system in applications in which it
charges capacitors, it cannot be used with a continuous load.
Figures 1 and 2 define the minimum cycle times at which this automated system can operate based on
the output voltage and capacitor capacitance.
For example, when charging a 25 V, 30 μF capacitor, a charge interval of approximately 37 ms can be
read from the point at which a line extending from the 30 μF position on the vertical axis intersects the
25 V line. This figure (37 ms) defines the minimum cycle for the automated system.
The time (T) representing the interval during the 37 ms for which the SM7860 charges the capacitor at the
full power of 50 mA or 10 mA can be calculated as follows:
T = C × V / I
C : Capacitor capacitance (μF)
V : Voltage (V)
I : Current (50 mA)
Using values of 25 V, 30 μF, and 50 mA yields:
T = 30 μF × 25 V / 50 mA
= 15 ms