A2_Manual 电路图.pdf

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1、 V3.1 / July 01 / Ben N:A2Proj#ManualsUser ManualEnglisha2um_31e_nti.doc Test the key will in this case toggle between WTD and Off. NOTE The optional filters are handled exclusively; if they are activated, they automatically switch Off any other active filter. Applications The LEVEL measurement is t

2、he most widely used measurement function in the Audio field. It is useful to Check the signal level Line up tape machines Calculate the output impedance of a DUT out of the level over a certain impedance Measure the frequency response Measure the balance between two channels Calculate the power from

3、 the level over a certain impedance To learn more about how to measure a frequency response, read chapter 6. Sweeps. Overview The A2/A2-D analyzer provides a bandwidth of 2Hz-250kHz in the Level mode The menu behind the key allows to set the unit to either between 1-chn. (mono) or 2-chn. (stereo) me

4、asurements. All standard frequency weighting filters as well as installed filter options may be activated. The unit of the generator output level may be altered in the Level measurement mode only. A2 Audio Test within these groups, the standards are functionally identical. One group consists of IEC

5、386, DIN 45 507, BS 4847 and CCIR-409. They measure with quasi-peak rectifier. Fig. 23 W there is no need to buy two different test tapes. User Manual A2 Audio Test ! = compulsory). Meas. Function /400Hz LP /22-22k Audio BP Notch IMD W level typical 3Vpp, Rout = 600. General Data Dimensions 274 x 39

6、6 x 132mm (11 x 15 x 5) Weight Approx. 9kg (20lbs) Fab. Requirements 100 / 120 / 230 / 240VAC, 50 / 60Hz, 85VA Temperature Range 0-45C (32-113F) Humidity 10-90% R.H. non condensing User Manual A2 Audio Test & Measurement System 100 / 104 V3.1 11. INDEX % % CROSSTALK .59 IMD.52 L.REL.48 N.REL .57 SIN

7、AD.51 THD+N.51 * *1 CROSSTALK .59 L.REL.48 N.REL .57 3 3rd Level Unit Menu . 45 A A2 Setup Menu. 85 Accessories. 95 ADDITIONAL (Measurement Function). 67 Agents. 100 Alt Input Channel.21 Monitor Output.26 Signal Menu.29 Signals .29 Alternate .See Alt Amplitude Sweep . 79 AOx Options. 89 Auto Range .

8、24 Scaling of Bar-graph.36 Scaling of Sweep Graph .39 B Backlight. 21 Balance of Input Channel. 48 Balanced Connection .25 Operation.28 Band Reject.See Notch Filter Bandpass Filter.59, 61 Bandwidth of IMD Measurement.52 of Noise Signal.31 of Sine Output Signal.31 Bar-graph. 36 Baudrate Menu. 90 Beam

9、 Finder. 36 Block Diagram Input Section .22 Output Stage.27 BNC Connectors.26 BS 4847.63 C Calibration.85 CCIR 409.63 468.35, 55, 57 CDs with Reference Tracks.78 CE Declaration of Conformity.3 Centronics Connector Pin Assignment.87 Interface.82 Channel Balance .48 Clock (internal).21 Coarse Mode .16

10、, 31 Connection Balanced.25 Unbalanced.25 Contrast.21 Crest Factor of IMD Signal.53 of Pink Noise.31 Crosshair.74 Crosstalk.59 Cursor.39, 74 D dB.51 IMD .52 Signal-to-Noise.48 dBm .45 L.SEL.62 dBq.55 dBr CROSSTALK .59 L.REL .48 N.REL.57 dBu.44 L.SEL.62 dBV .44 L.SEL.62 Degree.66 Deskjet.83 Different

11、ial Inputs .23 DIN 45403/4.53 45507 .63 Standard for IMD .30 Display Backlight .21 Contrast.21 A2 Audio Test & Measurement System User Manual V3.1 101 / 104 GRAPH Mode.38 METER Mode .34 Mode Overview .34 of Measurement Results.35 Overview .16 SCOPE Mode .42 Screen Saver.21 Distortion. 49 Drift (W&F)

12、. 64 Duty Cycle. 30 E Earth . 14 Environmental Conditions. 13 EPSON Printer. 83 External Notch Filter Synchronization.50 Sweep Control .77 Sweep Synchronization .70 Synchronization of Narrow BP Filter . 60, 62 F Fab Requirements. 13 Filter 80kHz Lowpass.94 Availability.67 A-Weighting.91 C-Message.93

13、 Custom Specific.92 External Control .50 Internal Control .50 Level .45 Narrow BP. 59, 61 Notch / Band Reject.49 Options.91 Overview .67 Synchronization . 60, 62 Fine Mode.16, 31 Fixed Range . 24 Floating Operation. 28 Flutter. 63 Freeze SCOPE Display. 43 Frequency Sweep.73 Front Panel Overview. 18

14、Fundamental Frequency. 49 Fuse (Mains Power). 13 G Gen. Status Line Menu.32, 35 Generator . 27 Block Diagram.27 Frequency. 16, 31 Frequency Display.35 Frequency Limits.31 Level . 16, 32 Level Display .35 Level Limits.32 Level Unit.36, 45 Mute .16, 33 Mute in Crosstalk Mode.59 Readback.32 Settings.29

15、 Signal in THD+N Mode .49 Signals.29 Graph Display Mode .38 Upload to PC.81 X-Scaling .40 Graphics Cursor.74 Menu .71 Ground Loop.25 Grounded Operation.28 Grounding.14 H hp Printer.83 I IBM Printer.83 IEC 268/3 .53 386.63 IEEE-488 Connector .87 Interface.14 IMD.52 Default Menu.53 Standards .53 Test

16、Signal.30 Impedance Menu .23 of Inputs.22, 23 of Muted Outputs.33 of Outputs.23 Input Block Diagram.22 Frequency.37 Impedance.22, 23 Level.37 Main / Alt Channel.21 Instrument Setup .85 Interface RS232 / IEEE-488 .14 Internal Notch Filter Synchronization.50 Sweep Synchronization.70 Synchronization of

17、 Narrow BP Filter .59, 61 Inventory.13 J JIS C 555 .63 User Manual A2 Audio Test & Measurement System 102 / 104 V3.1 K Keep a Sweep . 71 Key . 21, 24 .67 .59 .70 .31 .29 . 71, 72 .52 . 22, 23 .50, 60, 62, 71 .47 .61 .44 .32, 34, 35 .33 .57 .55 .66 .37, 43, 82 . 70, 80 .15 .42 .47, 57, 85, 90 . 69, 7

18、3 . 69, 73 .70 .69, 71, 73 .49 .35 . 45, 48 .64 .46 L Laserjet. 83 Level Display Menu.44 Measurement.44 Ratio of IMD Signal .30 Relative Measurement.47 Selective.61 Loudspeaker (Internal). 26 M Main Input Channel.21 Monitor Output.26 Mains Power. 13 Manual Range Setting.24 Scaling of Bar-graph.36 Scaling of Sweep Graph .39 Measurement CROSSTALK .59 IMD.52 L.REL .47 L.SEL.61 LEVEL .44 N.REL.57 NOISE.55 PHASE.66 Result Display .35 SINAD.51 THD+N .49 W&F.