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Bruel & Kjaer testplaat - mida sellega mõõta ja milleks?

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    Bruel & Kjaer testplaat - mida sellega mõõta ja milleks?

    Kas keegi seda veel kasutab?
    Bruel&Kjaer QR2007 Monophonic Gliding Frequency Record – 20-20000 c/s 45 rpm
    Frequency Sweeps: logarithmic 20 c/s to 20 kc/s in 15 seconds
    Recording Characteristic: IEC Standard no 3 without treble emphasis (constant velocity above 1 kc/s)
    Recorded Velocity at 1 kc/s: 3.16 cm/s rms
    Bands 1-10: lateral cut

    Bruel&Kjaer QR2008 Pick-up Test Record: spot frequencies, reference tones, lateral and vertical tracking, log sweep
    Section 1: spot frequencies 20-16-12.5-10kc/s,0.6cm/s rms at 45deg
    Band 1: 45 deg left modulation (A)
    Band 2: 45 deg right modulation (B)
    Section 2: reference tones 1kc/s, 4x60 sec, 2.24 cm/s rms at 45deg (3.16 cm/s lateral or vertical)
    Band 1: 45 deg left (A)
    Band 2: 45 deg right (B)
    Band 3: lateral (A+B)
    Band 4: vertical (A-B)
    Section 3: lateral tracking test, 100 c/s (A+B), 6x15 sec
    Band 1: 0.001 cm/s peak amplitude
    Band 2: 0.002 cm/s peak amplitude
    Band 3: 0.003 cm/s peak amplitude
    Band 4: 0.004 cm/s peak amplitude
    Band 5: 0.005 cm/s peak amplitude
    Section 4: vertical tracking test, same as section 3, vertical (A-B) modulation
    Section 5: log frequency sweeps, 10 c/s – 100 c/s, 16.6 sec, 0.00113 cm/s peak constant amplitude
    Band 1: 45 deg left (A)
    Band 2: 45 deg right (B)
    Band 3: lateral (A+B)
    Band 4: vertical (A-B)
    Section 6: same as section 1 but with small groove speed

    Bruel&Kjaer QR2009 Stereophonic Gliding Frequency Record, 20 - 20000 c/s, 45rpm
    Frequency Sweeps: logarithmic 20 c/s to 20 kc/s in 50 seconds
    Recording Characteristic: IEC Standard no 3 without treble emphasis (constant velocity above 1 kc/s)
    Recorded Velocity at 1 kc/s: 2.24 cm/s rms in 45 deg modulation, (3.16 cm/s rms in lateral and vertical modulations)
    Bands 1 and 5: 45 deg left modulation (A)
    Bands 2 and 6: 45 deg right modulation (B)
    Bands 3 and 7: lateral modulation (A+B)
    Bands 4 and 8: vertical modulation (A-B)


    Digital is like formaldehyde, first it kills the music, then it stores it forever.

    #2
    Vs: Bruel & Kjaer testplaat - mida sellega mõõta ja milleks?

    Esmalt postitatud martk poolt Vaata postitust
    Kas keegi seda veel kasutab?
    Raske küsimus. Kindlasti keegi kuskil.
    Et mõõta nii nagu tootja poolt ette nähtud, oleks vaja veel mitmeid B&K ühilduvaid seadmeid, näiteks Type 4416. Tavaliselt on iga plaadiga põhjalik juhend kaasas.

    Tahad tõesti teada, mida ja milleks?
    "Dreams are nothing more than wishes
    and a wish is just a dream you wish to come true."

    Comment


      #3
      Vs: Bruel & Kjaer testplaat - mida sellega mõõta ja milleks?

      Esmalt postitatud Yxz poolt Vaata postitust
      Raske küsimus. Kindlasti keegi kuskil.
      Et mõõta nii nagu tootja poolt ette nähtud, oleks vaja veel mitmeid B&K ühilduvaid seadmeid, näiteks Type 4416. Tavaliselt on iga plaadiga põhjalik juhend kaasas.

      Tahad tõesti teada, mida ja milleks?
      Mul on võimalus seda plaati laenutada. Pole ise seda plaati veel näinud. Omanikul plaadi ümbrist pole. Miski info on etiketile trükitud. Plaat on kunagi vist tele- või raadiomajas kasutusel olnud. Niiet ootan ära kuniks saabub ja siis uurin edasi.
      Digital is like formaldehyde, first it kills the music, then it stores it forever.

      Comment

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