JDA-21 Precision dual-display DC meter

dc meter Special instruments laboratory Model JDA-21Basic accuracy: 0.5 grade (by readings of the Digital meter)Range: 0-2mA-20mA-200mA0-1A-2A-5AMeter power: 220V±5%, 50HZWork environment Temperature: 0-40RH: ≤85%No corrosive gas around!Technical Specifications multi-purpose combination meter with four bit and one dot digital display and also analog display with precision of class 0.5wide range and multi Measuring rangeDC within the ammeter is close to zero impedanceUltra strong overload capacity, guarantee no damage to the appliances when doing something incorrect in experiment, and no affects to other appliancesAcoustic-optics alarm when overloaded and self-recovery when notSelf-record overload times, convenient for inspectionAssociate ideal meters, do not change current circuit state, can greatly improve the measurement accuracyButton switch for selection of milliamp range,the DC milliamp range has three tap positions, namely 2mA, 20mA and 200mAButton switch for selection of ampere range,the DC ampere range has three tap positions, namely 1A, 2A and 5Alock reading functionInternal/external transfer switch,toggle the switch upwards for external connection, and the pointer meter can be used separately; toggle the switch downwards for internal connection, and the two meters can be synchronized in displayindependence safeguard and independence power supply, canuse independentlyNone stop measuring for measuring range adjust, no need for power off and Re-connectedInstrument appearance length21cmwidth26.5cm Certificate of Design Patent