牌子: ISC ISC
價錢: $2000
本中心現介紹一台多功能的失真計。定能為你解決許多音頻問題。
各位Hi Fi發燒友。DIY製作者可能有下列經驗我的DIY或廠機前置或後級,經示波器測定，發覺波形很漂亮(感覺沒有失真)。但試音時還不夠理想。是的，只用示波器測量波形的失真是不夠的。因示波器可觀察到的失真波形為大於3%。所以細於3%失真是難觀察的。應該採用失真計來測量。失真計還可顯示(配合示波器)波形的諧波的形狀,，例如是單次或偶次諧波,噪音特性，如電源紋波等,其他不知名波形也顯示出來。從而作出適當措施.
配合專用adapter 還可測量你家中交流電源是否有噪音干擾, 質量 .加了濾波器，改了電源線，從新拉線，再用本失真計測量是否有改善。它還可幫你測量或調校各類音響設備，請看下文，總之失真計是你的Hi Fi 好幫手。
牌子:ISC (香港)
型號: DM2020K
100 % 新品
保用 : 1 年
附件 : 電源線 , 同軸線 (BNC to BNC) 1pc, 使用手冊, 測試碟(20-20KHZ, 15點),Power resistor 8 ohm 50W 1pc, resistor 600 ohm 1pc, AC noise adapter 1 pc ,
有干擾噪音波形demo Video (約1分鐘 )可試看.
如有疑問，請留下電郵，本人定當盡快回覆。
Trade at any MTR station or our centre .
可在本中心試機及教用.
本失真儀，可測量各音頻裝置,如各類半導體或真空館前置放大，後級功率放大器，均衡器,分音器，濾波器，5.1聲道擴音機,或各類音頻電子線路，配合CD測試碟，更可對各CD，DVD,SACD，VCD, Disman，CD ROM，作出失真測試，配合RF信號發生器，可對FM收音機， Tuner，對講機，如144MC，409MC，作靈敏度測試。配合測試唱片可測試唱頭唱針,在唱臂上的校準位置是否正確及及磨損,
配AC adapter (附件),可測電源噪音,干擾,質量
本機可調校各DIY制作,麼機,如改各電容，膽，電阻，火牛後，把失真調至最低，從而獲得最佳音質.
3位數字式錶頭作失真及電壓顯示
單旋鈕調校,設有失真方向指示燈(過高或過低)，迅速測定失真
兩級失真輸入電壓衰減器(10db, 20db)
失真輸入電壓範圍 0.3V -- 50Vrms
真有效電壓及失真顯示True RMS Display for distortion & AC voltage
高分解度(0.01%) 失真顯示
顯示器光暗控制到適合不同環境
內置高通(400HZ)，低通(30KHZ) 濾波器, 減少各種干擾，評估各失真特性，使測量更穩定
高阻抗 (100KΩ)輸入，減小負載效應.
內置100,1K,10KHZ,＜0.01% ,及幅度可調, 0 – 2 Vrms ,低失真穩定訊號源,不需外信號，使測量更快捷
內置(0.1%) 失真校準信號 (選件)，(全球首創)，迅速驗証失真計準確度及面板操 作是否正 確,這初次使用者非常有用
諧波監察輸出，可觀察基波濾波後產物, 如失真成分,諧波形狀,噪聲等,作出評估及分析
附送大量附件:測試碟(20-20KHZ),測試信號線,詳細說明書(詳述各前後級功放,膽機,CD, DVD ,SACD ,Tuner及其他音響設備測試方法) 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.
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 Voltage
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 = +/-1%,
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(+/-1%)
Distortion signal = 0.1%( +/-3%)
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= 5.5KG net Packing 7 kg
Operating temperature = ( 10 ℃ 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.
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