Models 2015 and 2015-P 6-1/2 Digit THD Multimeters and Models 2016 and 2016-P 6-1/2 Digit Audio Analyzing Multimeter0 pages

The Models 2015-P and 2016-P Audio Analyzing
Digital Multimeters and the Models 2015 and 2016
Total Harmonic Distortion Multimeters combine
audio band quality measurements and analysis
with a full-function 6½-digit DMM. Test engineers
can make a broad range of voltage, resistance,
current, frequency, and distortion measurements,
all with the same compact, half-rack measurement instrument. The Model 2016 and 2016-P
have twice the sine wave generator output of the
Model 2015 for applications that require test signals
greater than 8Vrms. The Model 2015-P and 2016-P
offer additional processing capacity for frequency
spectrum analysis.

•t THD, THD+Noise, and SINAD
measurements
•t 20Hz–20kHz sine wave
generator
•t Fast frequency sweeps
•t 2015-P, 2016-P: Identifies peak
spectral components
•t 2015, 2015-P: 4Vrms singleended or 8Vrms differential
output

Frequency Domain Distortion Analysis
For applications such as assessing non-linear distortion in components, devices, and systems, DSPbased processing allows the Models 2015-P, 2015,
2016, and 2016-P to provide frequency domain analm
ysis in conventional time domain instru­ ents. They
can measure Total Harmonic Distortion (THD) over the complete 20Hz to 20kHz audio band. They
also measure over a wide input range (up to 750Vrms) and have low residual distortion (–87dB). The
THD reading can be expressed either in decibels or as a percentage.
In addition to THD, the Models 2015, 2015-P, 2016, and 2016-P can com­ ute THD+Noise and Signalp
to-Noise plus Distortion (SINAD). For analyses in which the individual harmonics are the criteria of
greatest interest, the instruments can report any of the (up to 64) harmonic magnitudes that can be
included in the distortion measurements. The user can program the actual number of harmonics to
be included in a computation, so accuracy, speed, and complexity can be optimized for a specific
application. (See Figure 1.)
Figure 1. Frequency Spectrum of 1kHz Square Wave
0.35

•t 2016, 2016-P: 9.5Vrms singleended or 19Vrms differential
output

0.3

•t Individual harmonic magnitude
measurements
•t 5 standard audio shaping filters
•t 13 DMM functions (6½ digits)
•t GPIB and RS-232 interfaces

Applications
•t Wireless communication device
audio quality testing
•t Component linearity testing
•t Lighting and ballast THD limit
conformance testing
•t Telephone and automotive
speaker testing

Audio analyzing and total harmonic distortion DMMs

6½-Digit THD Multimeters
6½-Digit Audio Analyzing Multimeters

0.25

Ratio to
Fundamental

0.2

0.15

0.1

0.05

0
2

3

4

5

6

7

8

9

10

11 12

13

14

15

16

17

18

19

20

21

Harmonic

Figure 1 shows a plot of a square wave’s harmonics (frequency components) computed and
transmitted to a personal computer by the Model 2015 or 2016. A square wave’s spectral
content consists of only odd harmonics whose magnitudes are (1/harmonic number × the
magni­ ude of the fundamental). For example, the magnitude of the third harmonic is 1⁄3 the
t
magnitude of the fundamental.

1.888.KEITHLEY (U.S. only)
www.keithley.com
A Greater Measure of Confidence

DIGITAL MULTIMETERS & SYSTEMS

Audio analyzing and total harmonic distortion DMMs

2015, 2015-P,
2016, 2016-P