Digital frequency meter, digital frequency meter, power frequency meter

Used to measure the operation and frequency of the power gridOptional:

1. Relay alarm output module;

2. RS485 communication interface, using standard Modbus RTU protocol,

Provide upper computer software;

3. Analog transmission output, with optional DC4-20mA output signal DC0-

20mA, DC0-5V, DC0-10V, etc.

2、 Main technical indicators

IIIrelay alarm

The relay alarm mode can be set to upper limit, lower limit, or upper and lower limits, etc. The alarm value is set through the menu.

4、 Transmission output
Provide one analog transmission output, with analog transmission output signals ranging from 0~20mA, 4~20mA, 0~5V, 1~5V, 0~10V, etc.
Electrical parameters: accuracy level 0.5; When outputting current, the load resistance is less than 510 Ω, and when outputting voltage, the load resistance is greater than 100K Ω.

5、 Communication module
RS485 interface; Electrical connection: Three wire connection, namely A, B, 0V (signal ground); Connection type: asynchronous, half duplex; International standard Modbus RTU protocol, instrument address: 1-247, baud rates: 2400, 4800, 9600, data format: 10 bit asynchronous communication mode (1 start bit, 8 data bits, 1 stop bit, no parity bit); At present, the machine has opened the 03H and 04H read commands (used to read measurement data), and the 10H write register command. The 03H and 04H read commands have the same function. If the instrument receives an error in the command, it will not respond.