VA-2230A

Audio Analyzer VA-2230A

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Outline

The VA-2230A is a high-performance??A??i multifunction audio analyzer featuring a measuring signal generator with fast response and high stability and 10 measuring functions. It consists of a measuring signal generation block incorporating a programmable (DDS) oscillator and high-speed measurement block which processes signals using a notch filter??A??i HPF and LPF and applies DSP computations. The 10 measuring functions include the frequency measurement??A??i AC level measurement with a wide bandwidth up to 210 kHz??A??i wattage measurement??A??i total distortion measurement??A??i total harmonic distortion measurement??A??i high-order harmonic analysis??A??i S/N ratio measurement??A??i L/R ratio measurement??A??i SINAD measurement and DC level measurement. These functions can be used independently or can also be combined with the signal generation block to build audio measuring systems with low noise??A??i high accuracy and high speed. With digital technology invested everywhere??A??i the VA-2230A makes possible fully automated measurements including automatic range switching and automatically synchronized measurement data output. In addition??A??i it is also packed with a multiplicity of versatile functions including a preset memory for storing and recalling up to 100 measure-ment condition settings??A??i a limiting function using zone display with GO/NO-GO judgment of the measurement results??A??i an auto sequencing function which recalls the preset memory settings in sequence??A??i a printer output for printing the measurement results??A??i an EXT I/O for remote control and a GP-IB as standard.

Features

●DSP for Measurements Based on FFT Computations True rms measurements based on FFT are made possible by the DSP. The distortion measurements include the total distortion measurement (THD N) as well as the total harmonic distortion measurement (THD) and the harmonic analysis (HD) which have previously been available only with high-grade tools. ●DDS Signal Generator with Low Distortion The signal generator is capable of low-distortion signal oscillation based on the DDS (Direct Digital Synthesizer) method with a high 50 ppm frequency stability.  The setting can be made at a high speed. ●Large LCD for Versatile Display Three display modes include a numeric display mode (PAGE 1), an analog meter mode (PAGE 2) and a limit mode for use in GO/NO-GO judgments (PAGE 3). ●Excellent Operability Menu operations are performed based on selections using function keys， while direct keys are used to switch the output channels and measuring items. The output value settings can be modified using the numeric keys or the jog /shuttle keys. ●GP-IB Provided as Standard The GP-IB is now standard production line item. It also makes system expansion easy by enabling the transfer of memory contents between tools of the same model (memory copy), and the synchronized recalling of preset memory, etc. ●Floating Switching The GND circuits of the signal generation block, AC measurement block and DC measurement block are separate and each can be floated from the cabinet independently of the others. ●SINAD Measurement The SINAD measurement makes the analyzer usable in the field of communications equipment as well as in the field of audio equipment. ●Two Input/Output Channels While the signal generation and measurement blocks are composed of single-channel circuitry, signal switchers are built in to allow the input and output of 2 channels of signals. This makes possible the measurements of crosstalk, signal separation and L/R ratios. ●Other Major Features ●The frequency range of the frequency counter and AC level measurement functions is expanded up to 210 kHz to enable the head bias adjustment of the tape decks. ●Relative measurement is possible in AC level measurement while wattage display (virtual load) is possible when simulating a loudspeaker, etc. ●The BAL/UNBAL input capabilities make possible the non-grounded measurement of high-power amplifiers, etc. ●100-step sequence memory, which can be divided into 10 groups. ●I/O ports for external control and printing out. ●SPECIFICATIONS SPECIFICATIONS Signal Generator for Measurement ??A?…ÐOscillator??A?…I Frequency range 5Hz to 20.09kHz (DDS system) 20.1kHz to 110.0kHz (CR oscillator) Frequency setting resolution 1Hz (5Hz to 2.009kHz) 10Hz (2.01kHz to 20.09kHz) 100Hz (20.1kHz to 110.0kHz) Frequency accuracy ±0.005% (5Hz to 20.09kHz) ±3% (20.1kHz to 110.0kHz) Display digits  4-digit max. Spot oscillator??A??A1 20Hz (±0.005%) Spot oscillator??A??A2 1kHz (±0.005%) Spot oscillator??A??A3 20kHz (±0.005%) Output channels 2CH (L,R :Only common output) Output impedance 600Ω±2% (unbalanced) Output level range 14.0 to -85.9dBV/16.2 to -83.7dBm Output level resolution 0.1dB Output level accuracy ±0.5dB of set value (??A?†B-40dBV) ±0.8dB of set value (≤-40dBV) 1kHz??A?‘600Ω load Spot oscillator??A??A1 20Hz (±0.5dB) Spot oscillator??A??A2 1kHz (±0.5dB) Spot oscillator??A??A3 20kHz (±0.5dB) Frequency response ±0.05dB (20Hz to 20kHz)/±0.5dB (All ranges) Noise at OFF state ≤10μVrms Distortion (THD N) ≤0.0063% (20Hz to 20kHz, 80kBW) ≤0.01% (All ranges) Spot oscillator??A??A1 20Hz (0.001%THD N, 80kBW) Spot oscillator??A??A2 1kHz (0.001%THD N, 80kBW) Spot oscillator??A??A3 20kHz (0.001%THD, 80kBW) Measurement function block <Measuring items> Frequency measurement, AC level measurement (relative display/wattage display), DC level measurement, total distortion measurement (THD N), harmonic distortion measurement (THD), harmonic analysis measurement (HD), SINAD measurement, S/N measurement, ratio measurement (R/L, L/R). <Frequency measurement> Measuring range 5Hz to 210kHz Measurement resolution 5-digit (≥100Hz)/0.01Hz (??A?†I100Hz) Measuring accuracy ±5×10-4±1digit Input level range 1mV to 100Vrms <AC level measurement> Measuring range V (mV) dBV dBm 100V 40.0dBV 42.2dBm 30V 29.5dBV 31.7dVm 10V 20.0dBV 22.2dBm 3V 9.5dBV 11.7dBm 1V 0.0dBV 2.2dBm 300 mV -10.5dBV -7.8dBm 100mV -20.0dBV -17.8dBm 30mV -30.5dBV -27.8dBm 10mV -40.0dBV -37.8dBm 3mV -50.5dBV -47.8dBm 1mV -60.0dBV -57.8dBm 0.3mV -70.5dBV -67.8dBm Measuring accuracy ±2% of full-scale indication (1kHz) Frequency response ±5% (20Hz to 20kHz) reference : 1kHz ±10% (5Hz to 110kHz) reference : 1kHz ±20% (5Hz to 210kHz) reference : 1kHz Vestigial noise ≤4μV??A?…²80kBW??A?…± Response characteristics actual value Relative measurement range 0 to ±130dB Wattage display Power calculation based on AC level measurement and virtual load (RL) Resolution of watt display 5 digits max. Setting range of RL 2 to 5000 Ω <DC level setting> Input channel 1CH: for DC input Input impedance 1M Ω DC level measuring ranges 5 ranges (100V/30V/3V/300mV/30mV) DC level measuring accuracy ±(0.3%fs 0.75% of measuring value) <Distortion measurement common specifications> Fundamental frequency range 10Hz to 110kHz Distortion measurement range 100%  0.0dB 30% -10.5dB 10%  -20.0dB 3%  -30.5dB 1% -40.0dB 0.3%  -50.5dB 0.1%  -60.0dB 0.03% -70.5dB 0.01%  -80.0dB Secondary harmonic deviation ±1dB??A?…²20Hz to 20kHz??A?…± ±3dB??A?…²all range??A?…± Fundamental wave removal ratio 110dB or more 60dB (NOTCH) -50dB(FFT) Response characteristics (input) actual value Response characteristics (distortion) actual value Input level range 1mV to 100V Input ranges V??A?…²mV??A?…± dBV dBm 100V 40.0dBV 42.2dBm 30V 29.5dBV 31.7dVm 10V 20.0dBV 22.2dBm 3V 9.5dBV 11.7dBm 1V 0.0dBV 2.2dBm 300mV -10.5dBV -7.8dBm 100mV -20.0dBV -17.8dBm 30mV -30.5dBV -27.8dBm 10mV -40.0dBV -37.8dBm 3mV -50.5dBV -47.8dBm (30mV to 3mV ranges: manual only) Display units Input level: V, dBV, dBm Distortion: %, dB <Total distortion measurement> Measuring mode harmonic distortion noise(THD N) Residual noise/distortion (100V, 30V, 10V, 3V & 1V ranges??A?…± ≤-94dB (10Hz to 20kHz, 80kBW) ≤-80dB (all limits, 500kBW??A?…± input≥1/3 of full scale (300mV range) ≤-86dB (10Hz to 20kHz, 80kBW) ≤-66dB (all limits, 500kBW??A?…± input≥1/3 of full scale (100mV range) ≤-74dB (10Hz to 20kHz, 80kBW) ≤-60dB (all limits, 500kBW) input≥1/3 of full scale (3mV range) ≤-45dB (10Hz to 10kHz, 20kBW) input??A?†@2mVrms ??A?…ÐHarmonic distortion measurement??A?…I Measuring mode Nos. 2 - 10 harmonic waves are detected and measured Residual noise/distortion (100V, 30V, 10V, 3V & 1V range??A?…± ≤-100dB (10Hz to 20kHz, 80kBW??A?…± ≤-80dB (all limits, 500kBW) input≥1/3 of full scale (300mV range) ≤-94dB (10Hz to 20kHz, 80kBW) ≤-74dB (all limits, 500kBW) input≥1/3 of full scale (100mV range) ≤-86dB (10Hz to 20kHz, 80kBW) ≤-74dB (all limits, 500kBW) input≥1/3 of full scale <Harmonic analysis measurement> Measuring mode Nos. 2 - 10 harmonic waves are set to any value and measured Residual <SINAD measurement> SINAD measuring range 0 to 40dB (1 range) Residual SINAD Same as <Total distortion measurement> <S/N measurement> Input level 30μV to 100Vrms (both S component & N component) Measuring range 0 to 130dB (80kHzBW) S/N accuracy ±1.2dB Response characteristics actual value <Ratio measurement> Input level range 30μV to 100Vrms (both numerator and denominator) Ratio range 0 to ±130dB (80kHzBW) Ratio accuracy ±1.2dB (1kHz, full scale input) Frequency response ±2dB (standard: 1kHz) Display unit dB, % Response characteristics actual value <Measurement block common specifications> Input channels AC input: 2 CHs, alternate (Balanced and unbalanced switchable) Input impedance AC input: 10 kΩ, 100 kΩ ≤ 200 pF Maximum allowable input 150 V (DC AC peak) Grounding Floating and non-floating switchable (independently for DC, AC and signal generator) Averaging count 2, 4, 8, 16, OFF Built-in filters HPF (100 Hz/200 Hz/Optional), LPF (15 kHz/20 kHz/80 kHz /Optional), PSOPHO (IHF-A/CCIR-ARM/DIN-AUDIO/Optional) Optional filters 3kHz BPF/1kHz BPF/315Hz BPF/ CCITT P53TEL/C-MESSAGE/IEC-C <Other functions> <Sequence function> Operation specifications 1) Single Up; 2) Single Down; 3) Repeat Up; 4) Repeat Down <GP-IB function> SH1, AH1, T8, L4, SR0, RL1, PP0, DC1, DT1, C1, C2, C3, C27 1) Panel status; 2) Measurement value output; 3) Memory copy (between same models); 4) Memory synchronization (between same models, same versions) <EXT I/O function> 1) Level or frequency setting from an external rotary encoder; 2) Direct memory call; 3) Control output; 4) Limit judgment output; 5) Memory listing;6) 8-bit data read;7) Measurement data print-out. <Memory function> Memory point count 100 steps (Can be divided into 10 groups.) Setting contents 1) Panel setting; 2) EXT CONTROL I/O; 3) Limit data batch memory. <General specifications> Temperature/humidity for operation 0 to 40°C, RC 90% max. Temperature/humidity for characteristics in spec. 5 to 35°C, RC 85% max. LCD Temperature/humidity for operation 0 to 30°C, RC 90% max. 0 to 40°C, RH60% max. Power source 100/120/220/240V AC, ±10% (max. 250V)/Approx. 48W Dimensions 426 (W)×99 (H)×400 (D) mm Weight Approx. 10kg Accessories Instruction manual (1), cable (1), power cord (1)