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LMS speaker tester is introduced from 25 years up to now, many speakers around the world to develop and manufacture widely used in the r&d and production quality control, the traditional LMS speaker tester adopts ISA card provided, so is facing more and more parts out of date, so in order to solve these problems thoroughly, 25 years later new USES USB architecture model and LMS - V new product COM architectural patterns. Lms-v system hardware: LMS consists of low distortion sinusoidal oscillator, bistable adjustable tracking filter, microphone preamplifier, gated peak/average level detection circuit. Contains a set of line level output, balance line input and active microphone input. One of the four methods can be used for measurement. The external microphone preprocessor can be used for level calibration. The test frequency range is from 12Hz to allow up to 200 logical spatial frequency data points, which is equivalent to one data point for each pixel on the screen. Dual tracer filter can be used to measure flat, low pass, high pass, band pass and band stop responses. Measuring accuracy and flexibility are comparable to those of other expensive systems, making it easier for both novice and experienced users to set up and operate the lms-v, which covers all the features and functions of previous LMS versions of hardware and software, and extends new features:

> high performance, high precision, full analog signal frequency domain test, range of 10hz-100khz

> high performance optional multiplicative DAC architecture

> is suitable for RMS truth measurement for high precision noise and signal testing

> anti-noise phase truth measurement can continuously measure 360 degrees

> low error edited sinusoidal signal, accuracy of 0.001%, 10hz-100khz

> accurate noise generator, flat PINK filter (0.05dB), 10Hz-40kHz

>8- pole editable filter combinations are available for low - pass, high - pass, and bandpass applications

> filter combinations can be inserted into the output path for bandwidth-limited noise generation

> universal 4-pass limited bandwidth filter: 10Hz, 20Hz, 22.4hz, 400Hz

> extends 4 low pass limited bandwidth filters: 20KHz, 22.4KHz, 30KHz, 80KHz

> extends weight filter: ansi-a, ansi-b, ansi-c, ansi-d, itu-r-arm, itu-r-468

>140DB dynamic range, minimum: -120db, maximum: +20DBM

USB interface, WINDOWS compatible software

Single test multiple curves, multiple measurements