2015, 2016
2015-P
Ordering Information
2015
6
1
⁄
2
-Digit THD Multimeters
6
1
⁄
2
-Digit Audio Analyzing Multimeter
Wide Selection of Audio Filters
Five industry-standard bandpass filters are provided for shaping the input signal for audio and telecom-
munication applications. Available filters include the CCITT weighting filter, CCIR filter, C-message filter,
CCIR/ARM filter, and “A” weighting filter. The Models 2015-P, 2015, and 2016 provide programmable, high cut-
off (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
multi-functional design minimizes added equipment costs when configuring test setups.
Audio analyzing and Total Harmonic Distortion DMMs
Total Harmonic
Distortion 6
1
⁄
2
-Digit
Multimeter
2015-P Audio Analyzing DMM
2016
Total Harmonic
Distortion 6
1
⁄
2
-Digit
DMM w/9V Source
Output
These products are available
with an Extended Warranty.
Accessories Supplied
Model 1751 Safety Test Leads,
User Manual, Service Manual.
Figure 1. Total Harmonic Distortion
Analysis and Frequency
Response of a Portable Wireless
Telecommunication Device
Device Under Test
Figure 2. THD and 2nd, 3rd, and 4th Harmonics as a Function of Frequency
0
THD:
–10
–20
–30
–40
Levels relative to fundamental:
2nd harmonic
3rd harmonic
4th harmonic
Relative
Output
Level (dB)
Output
Transducer
Input
Transducer
–50
–60
–70
–80
–90
–100
100
1000
10000
Source
Output
Signal
Input
Frequency, Hz
2015
MULTIMETER
Figure 3. Frequency Response
10
Model 2015
5
D I G I T A L M U LT I M E T E R S
Figures 1, 2, and 3
demonstrate how the Model
2015-P, 2015, or 2016 can provide both time
domain and frequency domain measurements
in a single test protocol.
Figure 1
shows a
sample test system schematic with a telecom-
munication device in a loop back mode test.
The Model 2015 source provides a stimulus
frequency sweep, and the Model 2015 meas-
ures the response from the microphone circuit.
Figure 2
shows the resulting frequency domain
analysis of the THD and the first three harmon-
ics as a function of frequency.
Figure 3
shows
the time domain analysis of microphone circuit
output voltage as a function of frequency.
0
Relative
Output
(dB)
-5
-10
-15
-20
100
1000
10000
Frequency (Hz)
1.888.KEITHLEY
(U.S. only)
www.keithley.com
A
G R E A T E R
M E A S U R E
O F
C O N F I D E N C E
ETC [ ETC ]
