MiniSonic MS20 Specifications

General Information

Size215 x 160 x 33 mm. Weight 600g.
Display128 x 64 pixel OLED graphic display with 180° viewing angle. Brightness and power-off time configuration options are provided.
MicrophoneDual low-noise microphone inputs (two 3.5mm mini-jacks) with 5V power, calibrated to UniSon standard (-30dBu=100dBSPL). Precision calibrated miniature measuring microphones (1/4″) available at extra cost – see Microphones and Recording
UniSonInput and output sockets carry stereo balanced audio and power (6 to 9V 1A max). MS20 supplied with breakout cables to XLRs and phonos.
Headphone socket3.5mm stereo mini-jack for headphones 32Ω or greater. Automatic muting of internal speaker for stereo listening.
PowerSlot-in Sony NP500/530/560 style rechargeable lithium-ion battery included (15hrs use) or external 12V (11-14V) DC from 500mA mains adapter (included) via 2.1mm power jack. Battery charges internally in 15hrs (half charged in 4hrs) with power connected.
Monitor loudspeakerBuilt-in 65mm speaker and volume control for listening – monitors left channel on all measurements.
Accessories includedManual, UniSon to XLR and UniSon to phono input and output adapter leads (1m), mains lead, RS232 lead, Windows 11 compatible USB to serial convertor, 12V 1A mains PSU, lithium-ion battery and Lin4Win (running under all versions of Windows) support software supplied on USB memory stick.

Analyser Specification

InputsTwo-channel 44kΩ balanced or 22kΩ unbalanced on UniSon D-type socket (with 6-9v ‘PowerBus’ for microphone preamps etc).
Level measurementTwo-channel simultaneous level measurement: -50dBu to +19dBu in 10dB ranges (auto-ranging/manual). Accuracy ±0.05dB -20dBu to +19dBu. Quasi-peak reading as standard with fast option.
Frequency MeasurementFrequency readout to over 50kHz with high precision (±1Hz resolution).
Phase Measurement±180° 20Hz – 20kHz phase readout with ±2° resolution and accuracy (up to 40kHz with reduced accuracy).
NormalisePress and hold to normalise to any level in the range +19dB to -50dB. Toggle normalised or absolute.
PPM ModeBright, two-channel simultaneous display with PPM dynamics to IEC268 type II (BBC) standard. This mode also allows for -60 to +30dB precision variable gain on the loop-through output, with very low noise (-84dBu ITU-R 468 weighted) and distortion (-76dBu Distortion Residue) for studio use.
Noise measurementITU-R 468 weighting and quasi-peak dynamics. Residual input noise -88dBu weighted.
Distortion Residue MeasurementInstantly normalises and then nulls the fundamental and measures the residue on a 1kHz tone weighted according to IEC268 (ITU-R 468 curve and quasi-peak detector). Fully auto-ranging display relative to normalised level. Typical null depth -76dBu.
Crosstalk measurementMeasures weighted crosstalk, automatically muting the channel selected, while driving the other at the selected frequency and level.
Sequence ModeReceives over 30 Lindos test segments. Displays the results of all sequence segments on the OLED screen with up-down cursor on all graphs. Stores up to four complete sets of results for later transferring to a PC.

Oscillator Specification

OutputsTwo-channel (10Ω source impedance) balanced centre-grounded UniSon on 9-pin D-type plug. Unbalanced with phono or mini-jack leads.
Gain output for studio use provided on second 9-pin D-type plug. 10Ω source impedance, balanced centre-grounded. Unbalanced with phono or mini-jack leads.
Frequency Range4Hz to 40kHz sine in third and twelfth-octave steps, 1kHz 5kHz 10kHz square waves.
Frequency Accuracy±0.05% of specified synthesised frequency.
Flatness±0.02dB typical from 20Hz to 20kHz, -0.05dB at 31kHz, -0.6dB at 16Hz and 40kHz.
Level Range-90dBu to +19dBu in 0.5dB steps, balanced, centre-grounded; -96dBu to +13dBu single-ended.
Level Accuracy±0.02dB at 0dB; ±0.05dB at -60dBu and +19dBu.
Distortion-76dB distortion residue (weighted) (-86dB/0.005% THD) at 1kHz (22Hz-22kHz bandwidth) typical.
Minimum Load600Ω (-72dB THD).
Mute, restore, and channel selectionAuto-mute on selecting noise measurement. Auto-signal source selection on crosstalk and distortion. Residual noise when muted: -86dBu ITU-R 468 weighted.
Sequences19 pre-defined sequences and over 30 selectable test segments for user assembly including sweeps 20-20k and 40-40k, noise, crosstalk, distortion residue, noise vs time plot, headroom plot and phase plot.
Line-up segments Special segments for repetitive GLITS and channel ident tests. Also PPM and ITU-R 468 inverse-weighted tone-burst tests.
Presets4 level and 4 frequency presets (user programmable).
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