20HZ to 20KHZ Distortion Meter W SG

Brand: ISC(HK)

Model: DM2020

Description :

20HZ to 20KHZ Distortion Meter 

with low distortion signal generator ,AC voltmeter ,power line tester

(Like Hameg HM8027 , Kenwood HM250, GW )

 for tube pre ,power amp. testing like EL34,84,KT88,300B ,6P14,6BQ5

This meter can test the noise ,harmonic & interference for AC Power line using

AC noise & harmonic adaptor (standard accessories) & oscilloscope  See figure 2 & 6 

So you can verify your AC filer , AC socket ,AC power supply ok or not.

Figure 1 showing the cal signal (0.1%,1V gen. by DM2020K )

Figure 2 & 6 showing the harmonics,distortion, interference & noise for AC source (AC220V ,50HZ) .

Figure 7 showing the harmonics for tube amp  come out from monitor output.

Send email address to me for above photo .

Unit is never use ,100% new & all function work with one month limited warranty

Function

The DM2020K is an easy-to-use distortion meter that can measure total harmonics distortion (THD)

in audio amplifier & equipment. It covers audio band form 20HZ to 20KHZ with high resolution (0.01%) display.

This distortion meter is designed for testing all the audio device, like tube pre-amplifier ,tube power amplifier, transistor pre-amplifier, transistor power amplifier, FET pre-amplifier, FET power amplifier. Combined with an audio test disc, the DM2020K can test CD quality of CD , SACD, DVD,VCD player.

The DM2020K can also test distortion or sensitivity (12 dB SINAD =25% distortion).of FM radio & receiver with RF signal gen. e.g. FM tuner,144MC,409MC transceiver.

It is an useful instrument for manufacturer, laboratory, or audio amateur.  

Feature

3 digits LED display for distortion & AC Voltage measurement

One knob for tuning distortion ,with High/Low direction indication. for fast distortion Measurement

 Input attenuator (10dB, 20dB)

 Input voltage 0.3Vrms -- 50Vrms for distortion measurement ,

0.1V-50V for AC voltage measurement

 True RMS Display for distortion & AC voltage measurement

High resolution (0.01%)for distortion measurement

Intensity control of LED display for different environment

Build-in High Pass filter(400HZ) & Low Pass Filter(30KHZ) in reducing interference for accurate distortion measurement

High impedance input(100K ohm)

Build-in low distortion oscillator(option),100HZ,1K,10K, variable output (0-2Vrms.) 

Build-in distortion calibration signal (0.1%,1KHZ) for self testing & panel setting verification. It is very useful for unskilled operator.

Distortion Monitor output for waveform of harmonics & noise analyzes .

Specification ( 23 ?  +/ - 5? )  

Distortion Meter

Frequency Range = 20HZ to 20KHZ,3 ranges

Testing Range & resolution = 0.01%to 9.99%,0.1%to 50%,2 ranges

Accuracy =+/- 5%of reading + / - 1 digit (distortion > 0.1 %)

Test Method=True RMS display

Test Bandwidth=app.80KHZ

Residual Distortion & Noise <1 digit

Input voltage=min for 100%cal (0.3Vrms) ,max for 100%cal (50 Vrms)

Input Impedance=app 100K ohm

Input attenuation=10db,20db,2 ranges

Monitor output Impedance=app 10K ohm

Filter=High Pass(400HZ),Low Pass(30KHZ),-3dB

Display=3 digits LED

     AC Voltmeter

Test Range & resolution=0.1Vrms to 50.0Vrms,0.1V

Frequency response =20HZ to 30KHZ (+/- 1 db ,1KHZ reference) 

Accuracy=+/- 3% of reading +1 digit

Low Distortion Signal generator

Output frequency =100HZ,1KHZ,10KHZ ,3 ranges

Distortion : < 0.01 % @ 1 V output .

Frequency Accuracy = +/-3%,

Output Range= 0 to 3 Vrms (open circuit) ,0 to 1.5 Vrms (600 ohm loading)

Flatness = +/- 3% (refer to 1 KHZ ,1Vrms)

Attenuation=10dB

Output Impedance=app. 600 ohm

Distortion Calibration Signal

Frequency accuracy = 1KHZ(+/- 3%)

Distortion signal = 0.1%( +/-5% )

Output Range=0 to 3 Vrms (open circuit) ,0 to 1.5 Vrms (600 ohm loading)

Output Impedance=app. 600 ohm

Other

Operating Voltage=AC 110V or 200V (50HZ,60HZ)

Dimension= (130H X 215W X 310D) mm         

Weight= 3 KG net, Packing 5 kg 

Operating temperature = ( 10 ?  to 40 ? )  

Come with AC noise & harmonic adaptor 

detail manual (English or Chinese) 1 pc, power cord 1pc, BNC to BNC cable 1pc,

T joint connector (BNC) 1 pc, RCA (M) to BNC(F) connector 1 pc , BNC(M) to RCA (F) connector 1 pc

Power resistor 8 ohm 50W 1pc, Resistor 600 ohm 0.25W 1pc

Test disc 1 pc (CDR ,20 HZ to 20KHZ, 15 frequency points) for CD test ,

Picture CDR for power amp, DVD ,tuner, transceiver test setup. 

 Detail information (data sheet ,more photo) is available. Please ask if you have question.
Thanks