专利准确的双重显示了华盛顿电压米JDV-

Patent dual-display DC voltage meter JDV-21 Voltmeter1.Technical Specifications (1)Basic precision and laboratory precision0.5level(2)Range0 2V 200V 500V(3)Digital Display4½ Digital Display(4)Instrument appearancelength: 25.5cm width: 20.5cm height: 12.5cm(5)Auto-locking function(6)Manual reset function(7)Over range measurement protection, audible-visual alarm, automatic recording, extra overload sustainability, automatic overload clamping and reading resuming2. Precautions for use of meter(1)Meter power220V±5%, 50HZ(2)Work environmentTemperature: -5 40°CRH: ≤85%No corrosive gas around(3)The meter must be preheated for 15sec after being connected to power supply3. Main characteristics (1). Multifunctional A/D dual-display meter combining a 4 1/2 bit D meter and a pointer A meter of 0.5 grade calibration accuracy (2). Wide-and multi-range measurement options (3). Extra-strong overload capacity to protect the meter in case of any incorrect wiring or operation during experiment and measurement, without affecting power connection to other parts (4). Automatic sound-light alarm when overloaded; automatic retrieval of measurement after overload is eliminated (5). Automatic record of overload times to facilitate examination and check-ups during teaching (6). The AC wattmeter has voltage display, current display, single and combined overload display to facilitate troubleshooting (7). Wide frequency response (50KZ-20KHZ) for the AC meter (8). The sub-ideal meter does not change the circuit state when connected to the circuit, and can greatly increase the experimental test accuracy. (9). Reading latch functions (10). With independent protection system and independent stabilized power supply, independently workable away from experiment bench (11). Variable ranges for continuous circuit measurement. No need to disconnect and reconnect power supply (12). With data communication interfaces4. Certificate of Invent Patent 5.Factory View