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

The Keithley 2015/J is a 6.5-digit multimeter that combines precision DC/AC voltage and current measurement with specialized total harmonic distortion (THD) and audio analysis. It delivers comprehensive signal characterization across the audio band (20 Hz to 20 kHz) while providing full multimeter functionality for voltage, current, resistance, frequency, and temperature measurements. The instrument measures THD, individual harmonic magnitudes up to the 64th harmonic, THD+Noise, and SINAD with low residual distortion of –87 dB. Its dual capability—high-resolution metrology plus audio-specific analysis—makes it essential for audio equipment development, telecommunications testing, and production line validation.

## Technical Specifications

**Voltage & Current**
• DC Voltage: 100 mV to 750 V, 1 MΩ input impedance paralleled by <100 pF, 1000 V protection
• AC Voltage: up to 750 V rms, 1 MΩ input impedance paralleled by <100 pF
• DC Current: maximum 3 A (3 A, 250 V fuse protection)
• AC Current: maximum 3 A

**Resistance & Temperature**
• Two-Wire Resistance: up to 100 MΩ
• Four-Wire Resistance: up to 100 MΩ with lead resistance limits
• Temperature: J, K, T thermocouple types, –200°C to +1372°C, 0.001°C resolution, ±0.5°C accuracy

**Frequency & Distortion Analysis**
• ACV Frequency: 3 Hz to 500 kHz (±0.01% of reading accuracy)
• THD Measurement: 20 Hz to 20 kHz fundamental, 40 Hz to 50 kHz harmonics
• THD Accuracy: ±0.8 dB, 0.004%, or –87 dB (1 year, 23°C ±5°C)
• THD+Noise Accuracy: ±1.5 dB, 0.056%, or –65 dB
• SINAD Accuracy: ±1.5 dB
• Harmonic Reporting: up to 64 individual harmonics
• Audio Filters: 5 standard weightings (CCITT, CCIR, C-message, CCIR/ARM, A-weighting) plus programmable high-pass and low-pass filters

**Additional Functions**
• dB and dBm measurement (1 to 9999 Ω reference resistances)
• Continuity testing with 1 Ω to 1000 Ω threshold adjustment
• Diode test capability

## Key Features

• Measures THD and THD+Noise simultaneously with individual harmonic magnitude reporting
• User-programmable harmonic count for speed and accuracy optimization
• Low residual distortion ensures measurement integrity in low-distortion environments
• Five standard audio weighting filters plus custom bandpass filtering
• 6.5-digit resolution across all measurement ranges

## Typical Applications

• Audio amplifier and speaker characterization
• Power supply and converter THD assessment
• Telecommunications signal quality verification
• Production line acceptance testing
• Component distortion profiling

## Compatibility & Integration

The 2015/J operates as a standalone benchtop instrument with local front-panel control and supports integration into automated test systems through standard interfaces.