HDM210Harmonic Distortion Meter User Manual
I. Overview:
HDM210 is a harmonic distortion meter, which mainly detects the ratio of the fundamental wave of a sine wave signal to the third harmonic. Most harmonic problems are caused by the third harmonic. Because the third harmonic is the second highest energy of the fundamental component. Therefore, we are only concerned with finding the third-order harmonic distortion in Equation 1.
THD = V3 / V1 * 100% (1)
Note: V1: Fundamental wave; V3: 3rd harmonic; THD: Harmonic distortion;
Product application:
● Harmonic distortion meter;
● Frequency meter;
Third, the technical parameter table:
sequenceItem parameter unit Remark
1 Measurement frequency range 10 ～ 1000 Hz
2 Measuring voltage range 1 ～ 10 VDC Maximum amplitude 10.0Vpp AC signal
3 Measuring distortion 0.1 ～ 100.0%
4 Operating Voltage 7 ～ 12 VDC
5 Working current <50 mA
6 size 56 * 45 * 20 mm Length X width X height
Interface display and operation instructions:
(1) Key Description:
SEL: select monitoring parameters;
LCD display font: Note:
# 1,1st = 0.0 to display the fundamental value;
2,3st = 0.0 0.03th harmonic value is displayed;
3, THD = 0.0%, display harmonic distortion
4, Fre = 0Hz, measuring frequency is displayed
Function of potentiometer RW1: Adjust the moderate voltage value signal to the meter for measurement.
Light-emitting diode LED: Lights up when the input measurement voltage is too high.
Five, wiring
P1 wiring definition:
Serial number symbol meaning
1 VDD Module power positive (7V ~ 12V)
2 GND Module power negative
P2 wiring definition:
Serial number symbol meaning
1 AC AC signal input (maximum input 10Vpp)
2 AC AC signal input
Interface display:
