Keithley 2015 – Total Harmonic Distortion and Audio Analyzer Multimeter, 6.5-Digit

The Keithley 2015 is a 6.5-digit digital multimeter engineered for audio analysis and precision electrical measurement. This dual-line display instrument combines high-accuracy DMM functionality with dedicated audio testing capabilities—measuring Total Harmonic Distortion (THD), THD+Noise, Signal-to-Noise and Distortion Ratio (SINAD), and frequency across the 20 Hz to 20 kHz audio band. DC voltage accuracy reaches 0.003%, while 4-wire Kelvin resistance measurement spans 200 Ω to 100 MΩ at 0.05% accuracy. The instrument supports True RMS AC measurements, multiple temperature sensor types (RTD, thermistor, thermocouple), and GPIB remote control via IEEE-488 interface.

– Technical Specifications

Voltage & Current Measurements
• DC Voltage: 200 mV to 1000 V, 0.003% accuracy (6.5-digit)
• AC Voltage (True RMS): 200 mV to 750 V, 0.1% accuracy (5.5-digit)
• DC Current: 20 mA to 10 A, 0.05% accuracy (6.5-digit)
• AC Current (True RMS): 20 mA to 10 A, 0.3% accuracy (5.5-digit)

Resistance & Temperature
• Resistance (4-Wire Kelvin): 200 Ω to 100 MΩ, 0.05% accuracy (6.5-digit)
• Temperature Sensors: RTD, thermistor, thermocouple types

Audio Analysis
• THD: 0.001% to 100%, ±1% of reading + 0.1% distortion accuracy
• THD+Noise: 0.01% to 100%, ±1% of reading + 0.1% distortion accuracy
• SINAD: 0 dB to 80 dB, ±0.5 dB accuracy
• Frequency: 20 Hz to 100 kHz, 0.01% accuracy

Performance Characteristics
• Display: 6.5-digit dual line
• Input Impedance (Voltage): 10 MΩ || 140 dB at 50/60 Hz (DCV)
• NMRR: >60 dB at 50/60 Hz (DCV)

– Key Features

• Selectable test frequencies 20 Hz to 20 kHz for audio measurements
• Dedicated audio test signal output and banana jack inputs
• High input impedance with superior rejection of common and normal mode interference
• Configurable sampling rate for audio signal acquisition

– Typical Applications

• Audio equipment characterization and verification
• Telecommunications device testing
• Electronic component analysis
• Laboratory and production measurement environments

– Compatibility & Integration

GPIB (IEEE-488) interface enables remote instrument control and automated data acquisition in test systems.