Fully functional Audio Precision Portable One Plus. In good physical condition. Located in Denmark. From AP:? Audio Precision Portable One Plus is a compre- hensive two-channel audio test set. It includes the measurement functions of level (two channels simul- taneously), noise or signal-to-noise ratio (wideband, weighted, or selective), THD+N (total harmonic dis- tortion plus noise), SINAD (ratio of {signal + noise + distortion} to {noise + distortion}), phase (inter- channel or input-to-output phase shift through a de- vice), SMPTE/DIN intermodulation distortion (op- tion), real-time two-channel amplitude ratio (inter- channel balance or device gain/loss), wow and flut- ter, real-time frequency-selective crosstalk, ac mains check (voltage, frequency, and distortion of the ac power line), and ac resistance of the input of the de- vice connected to the generator output. Generally, three measurements are simultaneously displayed in PANELS mode. Portable One Plus can also sweep across any specified frequency range and display measurements in graphic form on the LCD display. Graph top and bottom values may be user-set as desired, and may be changed after a sweep with the data dynamically re-scaling. A graphic cursor provides numeric read- out of any point on the graph. High-resolution graphs, fast screen dumps, tabular data from a sweep or from self test, bargraphs, and panels may all be printed to an attached Epson-compatible paral- lel-connected printer. Portable One Plus is self-contained, requiring no external computer to operate. All measurements are displayed on a fluorescent back-lighted LCD (liquid crystal display). Signals within the audible range may be audibly monitored via the built-in loud- speaker or headphones. Amplitude and level meas- urements may be displayed in user-selectable units from the list of Volts, dBm (user-specified impedance reference), dBu, dBV, dBr (dB relative to a stored measured value), dBg (dB relative to the pre- sent generator output amplitude), and Watts (user- specified impedance reference). Distortion may be expressed in % or dB, and the absolute value of THD+N may further be displayed in most of the am- plitude units listed above. Units selected are remem- bered for each measurement function and will be automatically displayed when that function is next selected.

What you see here is a true gem and if youre looking at it you probably know what it is: an Audio Precision Portable One Dual Domain P1DD Audio Analyzer capable of incredible performance in either the analog or digital (96k) domains. This unit is in fantastic shape and passes all self tests. Full performance testing of Amps, DACs, you name it, including jitter, THD, Frequency Response, and many more tests, with no need for an external computer to run it. It is fully self-contained. This unit includes a few extra features: Intermodulation Distortion measurementGPIB interface- 96kHz digital FLP-A20K filterAudio Precision Carry CaseUser manual Low Distortion:Analog System THD+N 80 kHz BW –92 dBDigital Distortion THD+N –140 dBHigh Analog BandwidthSignal Generation to 120 kHz Low Noise:22 Hz–22 kHz < –114 dBuA-weighted < –118 dBuWide Input Voltage RangeInput Range 80 mV–250 V in 10 dB steps Flat Response:20 Hz–20 kHz ±0.05 dB Low Crosstalk:Input < –120 dBOutput < –110 dB Low Jitter:Generator < 0.8 nsAnalyzer < 1.6 ns

Fully functional Audio Precision Portable One Plus. In good physical condition. Located in Denmark. From AP:? Audio Precision Portable One Plus is a compre- hensive two-channel audio test set. It includes the measurement functions of level (two channels simul- taneously), noise or signal-to-noise ratio (wideband, weighted, or selective), THD+N (total harmonic dis- tortion plus noise), SINAD (ratio of {signal + noise + distortion} to {noise + distortion}), phase (inter- channel or input-to-output phase shift through a de- vice), SMPTE/DIN intermodulation distortion (op- tion), real-time two-channel amplitude ratio (inter- channel balance or device gain/loss), wow and flut- ter, real-time frequency-selective crosstalk, ac mains check (voltage, frequency, and distortion of the ac power line), and ac resistance of the input of the de- vice connected to the generator output. Generally, three measurements are simultaneously displayed in PANELS mode. Portable One Plus can also sweep across any specified frequency range and display measurements in graphic form on the LCD display. Graph top and bottom values may be user-set as desired, and may be changed after a sweep with the data dynamically re-scaling. A graphic cursor provides numeric read- out of any point on the graph. High-resolution graphs, fast screen dumps, tabular data from a sweep or from self test, bargraphs, and panels may all be printed to an attached Epson-compatible paral- lel-connected printer. Portable One Plus is self-contained, requiring no external computer to operate. All measurements are displayed on a fluorescent back-lighted LCD (liquid crystal display). Signals within the audible range may be audibly monitored via the built-in loud- speaker or headphones. Amplitude and level meas- urements may be displayed in user-selectable units from the list of Volts, dBm (user-specified impedance reference), dBu, dBV, dBr (dB relative to a stored measured value), dBg (dB relative to the pre- sent generator output amplitude), and Watts (user- specified impedance reference). Distortion may be expressed in % or dB, and the absolute value of THD+N may further be displayed in most of the am- plitude units listed above. Units selected are remem- bered for each measurement function and will be automatically displayed when that function is next selected.

Fully functional Audio Precision Portable One Plus. In good physical condition. Located in Texas. I believe the last time it was serviced was in 2008, it looks like thats what the sticker says. I bought this second hand, but I didnt experience any issues. I only used it a handful of times. From AP: Audio Precision Portable One Plus is a comprehensive two-channel audio test set. It includes the measurement functions of level (two channels simul- taneously), noise or signal-to-noise ratio (wideband, weighted, or selective), THD+N (total harmonic dis- tortion plus noise), SINAD (ratio of {signal + noise + distortion} to {noise + distortion}), phase (inter- channel or input-to-output phase shift through a de- vice), SMPTE/DIN intermodulation distortion (op- tion), real-time two-channel amplitude ratio (inter- channel balance or device gain/loss), wow and flut- ter, real-time frequency-selective crosstalk, ac mains check (voltage, frequency, and distortion of the ac power line), and ac resistance of the input of the de- vice connected to the generator output. Generally, three measurements are simultaneously displayed in PANELS mode. Portable One Plus can also sweep across any specified frequency range and display measurements in graphic form on the LCD display. Graph top and bottom values may be user-set as desired, and may be changed after a sweep with the data dynamically re-scaling. A graphic cursor provides numeric read- out of any point on the graph. High-resolution graphs, fast screen dumps, tabular data from a sweep or from self test, bargraphs, and panels may all be printed to an attached Epson-compatible paral- lel-connected printer. Portable One Plus is self-contained, requiring no external computer to operate. All measurements are displayed on a fluorescent back-lighted LCD (liquid crystal display). Signals within the audible range may be audibly monitored via the built-in loud- speaker or headphones. Amplitude and level meas- urements may be displayed in user-selectable units from the list of Volts, dBm (user-specified impedance reference), dBu, dBV, dBr (dB relative to a stored measured value), dBg (dB relative to the pre- sent generator output amplitude), and Watts (user- specified impedance reference). Distortion may be expressed in % or dB, and the absolute value of THD+N may further be displayed in most of the am- plitude units listed above. Units selected are remem- bered for each measurement function and will be automatically displayed when that function is next selected.