High accurate measurement for parameter: 
Voltage, 0.15%FS+4COUNT;
Current, 0.2%FS+4COUNT; 
Frequency, 0.1%;
Power, 0.3%FS+4COUNT.
Output voltage: 5~300V continuous adjustable. Quick & convenient 3 scales of preset voltage for high and low voltage simulation: 
High: +10%~+25% of preset voltage; 
Medium: preset voltage; 
Low: -10%~-30% of preset voltage.
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