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Please ask ship cost & handling charge before bid . 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 3 months 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 Frequency Accuracy = +/-3%, Voltage 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% ) Voltage 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
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