Analog and Digital Frequency Meter Connection Diagrams

Hi, in this article, we are going to see Analog and Digital Frequency Meter Connection Diagrams for Single Phase 230V and Three-phase 440V. Frequency meters are essential measuring instruments in electrical engineering. They are used to measure the frequency of electrical signals in power systems. Both analog and digital frequency meters have unique advantages and applications. Even both analog and digital frequency meters play vital roles in ensuring the stable and efficient operation of electrical systems, whether single-phase (230V) or three-phase (440V). While analog meters provide simplicity and low cost, digital meters offer precision and advanced features essential for modern electrical infrastructure. Although nowadays, digital frequency meters are mostly used but in some applications nowadays also analog frequency meters are also used. So, here we will see the wiring diagrams for both.

Frequency Meter Terminals Identification

Before going to properly connecting frequency meters to the electrical system we must identify all the terminals and their functions.

Analog Frequency Meter Terminals:

Common (COM): Reference point for the meter. This terminal should be connected to the Neutral terminal of the power supply when measuring a 230V single phase. And it should be connected to the Line 2 terminal of the power supply when measuring 440V three phase.

230V Terminal: This terminal is to be connected to the phase terminal of the power supply when measuring 230V single phase and needs to be kept disconnected when measuring 440V three phase.

440V Terminal: This terminal is to be connected to the Line 1 terminal of the power supply when measuring 440V three phase and needs to be kept disconnected when measuring 230V single phase.

Digital Frequency Meter Terminals:

230V Power Terminals (L and N): Provide power for the meter to operate. A 230V single-phase AC supply is to be provided to these terminals.

0-1000V Input Terminals (Uh and Ul): Measure the input voltage for frequency measurement, with Uh for high voltage input and Ul for the reference (low voltage input). The power supply up to 1000V is to be applied to these terminals that is to be measured.

Analog Frequency Meter Connection Diagram

Here, you can see the connection diagram of an Analog Frequency Meter for 230V single and 440V three-phase.

Connection Description

For Single Phase 230V

1. The Common terminal is connected to the Neutral terminal of the power supply.
2. The 230V terminal is connected to the phase terminal of the power supply.
3. The 440V terminal is disconnected or kept open.

For Three Phase 440V

1. The 440V terminal is connected to the Line 1 terminal('R' phase) of the power supply.
2. The Common terminal is connected to the Line 2 terminal('Y' phase) of the power supply.
3. You can connect the meter to any two phases from the three phases.
4. The 230V terminal is disconnected or kept open.

Digital Frequency Meter Connection Diagram

Here, you can see the connection diagram of a Digital Frequency Meter for 230V single and 440V three-phase.

Connection Description

For Single Phase 230V

1. The 230V power terminals are connected to a 230V AC power source.
2. The 0-1000V input terminals are connected to the same power source as here we will measure the same power source. If you want to measure another power supply you can connect that power supply to these input terminals.

For Three Phase 440V

1. The 230V power terminals are connected to a 230V AC power source by taking any one phase from the three-phase and the neutral.
2. The 0-1000V input terminals are connected to the 'R' and 'Y' phases. You can connect the meter to any two phases from the three phases e.g. R-Y, R-B, Y-B, etc.

Read Also: 

• Three(3) Phase Digital Panel kWh Meter Connection Diagram
• Ammeter Connection Diagram with Selector Switch and CT
• Voltmeter and Selector Switch Connection for Three (3) Phase Supply
• Digital Voltmeter Wiring Diagram and Connection Procedure
• Digital Ammeter Wiring Diagram and Connection with CT

Thank you for visiting the website. Keep visiting for more updates.