OSA103 Mini
PC based USB multifunction measuring device


  • Multi channel mixed signal oscilloscope
  • Multi function generator
  • Frequency meter
  • Spectrum analyzer
  • Frequency and phase response analyzer
  • Vector antenna analyzer
  • LC Meter
  • Reflectometer
  • SDR transceiver


1 analog channel + 4 digital channels + generator virtual channel.
Analog channel input impedance – 50 Ohms
Analog channel bandwidth – 1 Hz … 400 MHz (AC coupling only)
Analog channel real time sample rate – 200 MHz
Equivalent time sample (ETS) rate – 10 GHz
Memory depth – up to 40k samples

Base input sensitivity – 0.1 V/Div
Digital channels with adjustable threshold levels and real time sampling rate of 1.6 GHz.
Advanced flexible fully digital triggering.
Fully digital ETS mode that provides stable triggering from noisy and high frequency (up to 1 GHz) signals.
Peak detector and high resolution mode.

Function Generator 0.001 Hz … 50 (100) MHz (50 MHz – with flatness better than 0.5 dB).
AM, FM, PM modulation and signals 
summation. Built-in modulation generator 0.001 Hz … 100 MHz.
Oscilloscope synchronous frequency sweep mode.
generator 5 ns … 5 s, noise generator and arbitrary waveform generator with scripting language to describe waveforms.
Small overshoot/undershoot and high slew rate of
pulse signals.
Auxiliary multifunctional digital output.

Frequency meter
The hardware frequency counter can work with any input channel, as well as with the oscilloscope trigger. It has 8 digits in the frequency counter mode and a constant relative accuracy over the entire range (reciprocal counting). It can count pulses and measure a period. The adjustable temperature compensated system clock generator (VCTCXO) provides accuracy better than 1 PPM.

Spectrum analyzer
Principles of operation – FFT, combined multi-frequency FFT that forms spectrogram up to 1 GHz without aliasing. The spectrum analyzer has adjustable FFT size, 9 window functions, averaging and scaling for different impedances, an advanced algorithm for accurate measurements of the peak level and frequency, clean internal spectrum (without parasitic spectral components). Subtractive dither technology is used to improve performance.

Frequency and phase response analyzer
Principles of operation – frequency sweep and tracking synchronous digital quadrature receiver.
Amplitude and phase characteristics, linear and logarithmic scales, customizable range.
Calibration (amplitude and phase normalization).
Frequency range – 100 Hz … 100 MHz
Dynamic range (10 kHz … 60 MHz) – more than 90 dB

Vector antenna analyzer
Principles of operation – frequency sweep and tracking synchronous digital quadrature receiver.
Measuring complex impedance of a connected circuit using shunt-
thru method.
Frequency range – 10 kHz … 100 MHz
OSL calibration and “mathematical subtraction” of the connecting cable.
Measurement (calculation) VSWR, Return Loss for cables 
(lines) with user defined  Zo in the range of 10…320 Ohms. 
Measurement (calculation) Q, Rs, Xs, | Z |, Phase Z, Rp, Xp.

LC meter
Capacitance measurement range – 0.5 pF … 30000 uF
ESR measurement range (C> 0.5 uF) – 0.050 Ohm … 1 kOhm
Inductance measurement range – 50 nH … 3 H

SDR transceiver
The device can work as a DDC / DUC transceiver in conjunction with SDR programs supporting Winrad API. Tested with HDSDR, Zeus Radio, SDRuno, SDRSharp ver 1361.

Reception mode (HF bands):
ADC Sampling – 200 MSPS, 8 bit
MDS (500 Hz) – -97 dBm
ADC overflow level – +2 dBm
Input frequency range 3 dB flatness (through Nyquist zones, filters required) – 1 Hz … 400 МНz
IMD3 – 60…70 dB
Panadapter maximum span – 65 kHz

Transmission mode:
Max output power – +5 dBm
Output frequency range 1 dB flatness – DC…60 MHz
AM, FM, LSB, USB, CW modes.
Transmission mode is fully implemented in the device. An external mic. amp. is required for voice transmission.

The device is powered from a USB port and requires no additional power supply.