]Keithley 2015 系列：THD 和音频分析万用表_数字万用表_通用测试仪器_产品中心

产品描述：
我们的音频分析万用表将音频带质量测量和分析与多用途 6½ 位 DMM 集于一体，一切尽在一台半机架仪器中。它们可以测量 20 Hz 至 20 kHz 音频带范围内的总谐波失真 (THD)，还可以计算总谐波失真+噪声和信纳比 (SINAD)。 2015P 和 2016-P 设备可直接识别频谱峰值。

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产品特点

Dual Output Source

The 2015 and 2015-P include an internal audio band sine wave source for generating stimulus signals. A second output, the inverse of the first output, is also available, simplifying the testing of differential input circuits for common mode or noise cancellation performance. The 2015 and 2015-P have a 4 Vrms single-ended output and 8 Vrms differential source output.

Wide Selection of Audio Filters

Five industry-standard bandpass filters are provided for shaping the input signal for audio and telecommunication applications. Available filters include the CCITT weighting filter, CCIR filter, C-message filter, CCIR/ARM filter, and “A” weighting filter (see Figures 5a–5e). The 2015 and 2015-P provide programmable, high cutoff (low pass) and low cutoff (high pass) filters. Furthermore, the two filters can be implemented together to form a bandpass filter. The programmable filters can be used to filter out noise generated by electromechanical machinery on the production floor or to simulate other types of system transmission characteristics.

Broad Measurement Flexibility

In addition to their THD, THD+Noise, SINAD, and individual harmonic measurement capabilities, the instruments provide a comprehensive set of DMM functions, including DCV, ACV, DCI, ACI, 2WΩ, 4WΩ, temperature, frequency, period, dB, dBm, and continuity measurements, as well as diode testing. This multifunctional design minimizes added equipment costs when configuring test setups.

Wide Band or Narrow Band Noise Measurements

The 2015 and 2015-P are capable of measuring both wide band noise and narrow band noise. Alternatively, these instruments’ DSP (digital signal processing) capabilities allow users to make frequency domain measurements of RMS voltage noise over the 20 Hz–20 kHz frequency audio band or a narrow portion of the band. Furthermore, noise measurements can be extracted in the presence of a stimulus signal for fast signal-to-noise computations.

Spectrum Analysis

The 2015-P has internal computational capabilities that allow it to characterize an acquired signal spectrum. This instrument can identify and report the frequency and amplitude of the highest value in a complete spectrum or within a specified frequency band. It can also identify additional peaks in descending order of magnitude (see Figure 6). The 2015-P’s onboard capabilities make it simple to obtain a thorough analysis of a frequency spectrum more quickly and with little or no need for external analysis software.

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