Voltage/Current Calibrator - CC421


  • Source and measure voltage and current
  • Current calibrator drives loads up to 500Ω
  • Measures from 30 to 130 dB with 0.1dB resolution
  • Measures Lp, Leq, LE, Lmax, Lmin
  • A, C and Flat frequency weightings
  • Fast and Slow time weighting
  • 4-digit LCD with bargraph indication and large dot matrix display with backlighting
  • Maximum memory of 10,000 records of Lp data
  • Real time clock with calendar
  • RS-232 serial interface
  • Analog AC and DC outputs
  • Includes adjustment screwdriver, wind shield ball, PC software diskette, RS232 connecting cable, 9-pin to 25-pin gender changer, 3.5" plug, 4 AA batteries, AC/DC adapter, instruction manual and carrying case


  • Measurement Range: 30 dB to 130 dB
  • Resolution: 0.1 dB
  • Accuracy: ±1.5 dB (ref 94 dB @1kHz)
  • Frequency Range: 25 Hz to 10 kHz
  • Frequency Weighting: A,C and Flat
  • Time Weighting: Fast and Slow 1/1-1/3 Octave Range: 5 ranges in 10 dB step, 20-90dB, 30-100 dB, 40-110dB, 50-120dB, 60-130dB
  • Band Filter Freq.: 1/1 Octave: 9 bands, 31.5Hz,63Hz, 125Hz, 250Hz, 500Hz, 1kHz, 2kHz, 4kHz, 8kHz; 1/3 Octave: 27 bands, 25Hz, 31.5Hz, 40Hz, 50Hz, 63Hz, 80Hz, 100Hz, 125Hz, 160Hz, 200Hz, 250Hz, 315Hz, 400Hz, 500Hz, 630Hz, 800Hz, 1kHz, 1.25kHz, 1.6kHz, 2kHz, 2.5kHz, 3.15kHz, 4kHz, 5kHz, 6.3kHz, 8kHz 10kHz
  • Microphone: 1/2" Electret condenser microphone
  • Display: 160 x 160 dot matrix display w/ backlight, 4-digit LCD, updated every 0.5s.; quasianalog bar indicator 4 dB steps, 100dB display range, updated every 10ms
  • Memory Capacity: Manual: 1024 data sets; Auto: Sound level; 10,000 data sets, 1/1-octave; 6140 data sets, 1/3-octave: 3070 data sets
  • Analog Output: 2VACrms ( f.s.), 10mVDC/dB
  • Power Supply: Four 1.5V LR14/C-size alkaline batteries, 6V, 1A external DC power supply
  • Battery Life: About 2 hours
  • Dimensions: 345(H) x 100(W) x 60(D)mm
  • Weight: Approx. 950g