KV-DVM100V Non-Isolated Interface Digital Display Voltmeter 5-bit High-precision DC Voltmeter 0-99.999V

KV-DVM100V Non-Isolated Interface Digital Display Voltmeter 5-bit High-precision DC Voltmeter 0-99.999V

Description:
- The voltmeter head adopts the scheme of high-precision reference + high-precision sampling resistance, with accurate measurement and high resolution.
- The 1M ohm high resistance input resistor can be used to measure the weaker (low current drive capability requirement) signal, which has little impact on the measured system.
- The bipolar design scheme is adopted, which can measure two-way positive and negative voltages up to ± 100V. The voltage can be measured normally without deliberately distinguishing wiring.
- The module will not work when the power supply is connected reversely, but it will not damage the circuit.
- If the input overload voltage is high and the input voltage reaches 150V, the circuit will not be damaged. When the voltage recovers to plus or minus 100V, the module will immediately measure the voltage normally without restarting.
- The module integrates serial port communication function (non-isolated version: TTL serial port; isolated version: 485 interface). The module voltage data can be read back by SCM, computer (USB to serial port module is required) and other devices. For Modbus protocol is adopted for large-scale integration and industrial application.

Parameter:
- Model: KV-DVM100V (Non-isolated version)
- Type: voltmeter
- Power supply voltage: 4~30V
- Measuring range: 0~±100V
- Input impedance: 1M Ω
- Product power consumption: 15mA (min: 14mA typ: 15mA max: 16mA)
- Display resolution: 1mV
- Measurement accuracy: 0.02%+0.04%, ±(the quantity range%) (Tcal23℃±5℃)
- Reverse connection protection of power supply: reverse connection voltage≤30V)
- Maximum input voltage: 150V
- Communication interface: UART_3.3V (9600Baud; 8Bits; None Parity; 1Stop Bit)
- Communication protocol: Modbus (support OXO3, OXO6 order)
- Weight: 14.5 ± 1g
- Size: 29 x 48 x 22mm (error±1mm)
- Operating temperature: -15 - +85℃

FAQ:
Q: What happens when the voltage measurement shows that it is always drifting?
A: When testing after receiving the product, users need to ensure the stability of the voltage to be tested before accurately measuring the stability of the product. Common error operations collected so far include:
1. The battery string resistance scheme is adopted to provide the voltage to be measured:
As the voltage of the battery decreases gradually during use, the voltage of the voltage divider also decreases gradually, indicating a natural gradual decrease (please use a stable power supply to generate a voltage test).
2. Use small package resistor or small resistance value resistor to generate voltage:
Small package resistors tend to have low power and poor heat dissipation. They will become hot when passing through the current. The resistance value will drift with the temperature drift, and the distributed voltage will also drift. (It is recommended to directly measure the power output terminal to test the module performance, or use a high-power resistor to generate a stable voltage.)
Q: Can I use battery for power supply?
A: Yes. The module has a wide power supply voltage. As long as the battery voltage is within the nominal power supply range of the module, the battery can be used for power supply.

Package Included:
- 1 x KV-DVM100V (Non-isolated version)
- 1 x cable

Note:
- Battery is not included.
- Do not use a power supply that exceeds the nominal supply voltage range to power the module.
- The voltage shall not exceed 30V when the power supply is connected reversely.
- The non-isolated meter is a common ground design. If the meter and the circuit to be tested are powered by the same power supply, only the voltage between the negative power supply and other nodes in the circuit can be measured. If multiple meters are required to monitor the voltage between any nodes in the circuit at the same time, please use isolated meters.
- The non-isolated meter head is a common ground design, and the negative pole of the meter head power supply terminal and the negative pole of the voltage test terminal are completely connected. If the meter head and the object to be tested are powered by the same power supply, the negative pole of the meter head can only be connected to the negative pole of the power supply of the object to be tested, and the negative pole of the meter head can never be connected to the nodes of the network to be tested other than the negative pole of the power supply, otherwise the network to be tested may not work normally or the network to be tested may be damaged. Wiring rules shall be: measuring positive pole -- connecting -- any point to be measured in the circuit; Measure negative pole -- connecting -- circuit supply negative pole. The black measuring line can only be connected to GND. The isolated type header does not have this problem.