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16
Appendix
16.1 Internal Circuit Block Diagram
LOW
Filter
HIGH
Power supply
Voltage detection
(Protective impedance)
Current
detection
RS-232C
GP-IB
USB
LAN
LCD
EXT. I/O
CPU
A/D
A/D
PWM
Rectification
High voltage power supply
B
A
DUT
100 V to 240 V AC
• A switching power supply with a wide input range between 100 V and 240 V is used for the power
supply unit. This enables stable measurements even in environments where the power supply is
unstable (A).
• Direct voltage from 10 V to 8 kV is output. Stable voltage can be output even if the test target
contains capacitive components (B).
• A measurement signal is converted to a digital value by the high-speed and high-resolution
A/D converter through the voltage and current detection circuit and stable measured values and
waveform display that is very close to the actual waveform can be achieved (C, D).
•
The voltage detection circuit also fulfills the role of protection impedance. To satisfy the IEC
61010 safety standard, the accessible parts (i.e., interface and case) and high-voltage circuits are
isolated.
16 Appendix
Appendix
HIOKI ST5680A961-00
Содержание ST5680
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