Description
Rectangular AC voltmeter 69L7-V AC voltmeter refers to a meter used to measure the effective value of AC voltage. In the field of strong electricity, AC voltmeters are often used to measure the voltage of the monitoring line.
Usually, the AC voltmeter first amplifies the small signal and then measures it as an input stage to minimize the impact of the measuring instrument on the circuit under test. At the same time, a circuit with a high input impedance is used as the input stage to minimize the influence of the measuring instrument on the circuit under test.
The AC voltmeter can be divided into amplification-detection type, detection-amplification type and heterodyne type according to the composition of the circuit.
The commonly used AC voltmeter belongs to the amplification-detection type electronic voltmeter. It is mainly composed of attenuator, AC voltage amplifier, detector and rectified power supply.
The measured voltage is first attenuated by the attenuator to a value suitable for the input of the AC amplifier, then amplified by the AC voltage amplifier, and finally detected by the detector to become a direct current flowing through the magnetoelectric meter, and the meter head indicates the magnitude of the measured voltage.
1. Uses:
Embeddedly installed on ships, locomotives, power stations, mines, metallurgy, petrochemicals or other mobile power equipment, measuring AC current voltages with rated operating frequencies of 50, 400, and 427 Hz.2. Main technical performance:
Class 2.5, splash proof and vibration resistant.
3. Conditions of use:
Ambient temperature: -25 ～ + 55 ℃, relative temperature: <98% RH
4. Measurement range:
|
Model and Name |
Measuring range |
Access method |
|
69L7-A rectangular AC ammeter |
0, 5, 1, 2, 3, 5, 10, 20A |
Direct access |
|
5, 10, 20, 30, 50, 75, 100, 150, 200, 300, 400, 600, 750, 800A 1, 1.5, 2, 3, 4, 5, 6, 7.5, 10KA |
Access via current transformer (Secondary current 5A) |
|
|
69L7-V rectangular AC voltmeter |
30, 50, 75, 100, 150, 300, 450, 500, 600V |
Direct access |
|
3, 6, 7.2, 12, 18, 42KV |
Access via voltage transformer (secondary voltage 100V) |
