G.R.A.S. 50GI-R CCP Intensity Probe with Remote Control

Freq range: IEC 61043 Class 1
Dyn range: 27 dB(A) to 163 dB
Sensitivity: 12.5 mV/pa
  • 50GI-R Intensity Probe with Remote Control
  • 50GI-R Intensity Probe with Remote Control

Typical Applications and Uses

  • Sound intensity measurements
  • Sound source location
  • Sound power measurements
  • IEC 61043 standard measurements
  • Sound source ranking
  • Sound intensity mapping


The probe set includes solid interchangeable spacers for microphone separations from 12 mm to 100 mm so that the probe can cover the frequency range from 50 Hz to 10 kHz.

All components are made specifically for sound intensity applications. Each small ¼" diameter by 40 mm long microphone preamplifier is housed in a robust stainless steel casing, which enables novel probe designs for reducing disturbances to the soundfield otherwise brought about by the effects of shadows and diffraction, and a symmetry which enables reliable calibrations as described in the proposed standard (ISO/DIS 9614-2) for sound power measurements using sound intensity measurements.

The 50GI-R CCP Intensity Probe comprises a 40GK sound Intensity Microphone Pair, two 26CB CCP Microphone Preamplifiers, four solid spacers of various lengths, windscreen, and probe handle with remote control.

The 50GI-R is delivered in a carrying case as a ready-to-use kit, complete with all the above accessories. The microphones are ½" free-field prepolarized microphones with a uniquely-designed pressure equalization system which ensures extremely well defined phase characteristics.

The microphones and preamplifiers are mounted on a swivel head on the telescopic arm of the Remote control handle. To cover the full frequency range from 50 Hz to 10 kHz, the 50GI-R probe is delivered with four solid spacers for spacing the microphones at 12 mm, 25 mm, 50 mm and 100 mm. These spacers can be easily interchanged without dismantling the probe.

Frequency range (±2 dB) Hz IEC 61043 Class 1
Weight g / oz 400 / 14.110


G.R.A.S. 40GK Microphone set
G.R.A.S. 26CB Set ¼" CCP Preamplifier
G.R.A.S. RA0003 Adapter for 1/2" microphone and 1/4" preamplifier
G.R.A.S. RA0001 Right-angled (90º) Adapter for 1/2" microphone and 1/4" preamplifier
G.R.A.S. AA0021 5 m cable for Intensity Probe
G.R.A.S. AC0024 Coupler for two-port Calibration
G.R.A.S. AA0084 Cable, SMB-Microdot, 30 cm (male-male)
G.R.A.S. KE0132 Serial to USB Adapter
G.R.A.S. AI0048S Probe handle
G.R.A.S. AI0001 Windscreen


G.R.A.S. 51AB Phase Calibrator according to IEC 61043
G.R.A.S. 42AP Intelligent Pistonphone, Class 0
G.R.A.S. RA0024 Coupler for two-port Calibration