G.R.A.S 50GI-RP CCP Rugged Intensity Probe

Freq range: IEC 61043 Class 1
Dyn range: 27 dB(A) to 163 dB
Sensitivity: 12.5 mV/Pa

Typical applications and use

  • 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 50 mm so that the probe can cover the frequency range from 100 Hz to 10 kHz.

All components are made specifically for sound intensity applications. Each small 1/4" diameter by 40 mm long microphone preamplifier is housed in a robust stainless steel casing. The probe head is symmetrical which enables reliable calibrations as described in the proposed standard (ISO/DIS 9614-2) for sound power measurements using sound intensity measurements.

The G.R.A.S. 50GI-RP CCP Intensity Probe is a two-microphone sound intensity probe especially designed for use in conditions calling for a rugged design. It is equipped with CCP transducers and a remote control handle for direct connection to an intensity analyzer. The remote-controlled intensity probe comprises a 40GK-S1 sound Intensity Microphone Pair, two 26CC CCP Microphone Preamplifiers, three solid spacers of various lengths, windscreen and a probe handle.

The 50GI-RP is delivered in a carrying case as a ready-to-use kit, complete with all the above accessories.

The microphones are 1/2" free-field prepolarized microphones with a uniquely-designed pressure equalisation system, which ensures extremely well defined phase characteristics.

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

Polarization voltage V 0

Frequency ranges for different microphone spacers


G.R.A.S. RA0213 Rugged Probe Head
G.R.A.S. 40GK-S1 1/2"' Intensity Microphone Set
G.R.A.S. RA0001 Right-angled (90º) Adapter for 1/2" microphone and 1/4" preamplifier
G.R.A.S. GR0040 Holder for spacer
G.R.A.S. RA0264 Spacer, 50 mm
G.R.A.S. RA0265 Spacer, 25 mm
G.R.A.S. RA0266 Spacer, 12 mm
G.R.A.S. 26CC Set 1/4" CCP Preamplifier set
G.R.A.S. AA0021 5 m Extension Cable, 5 m, 12 pin LEMO male - male
G.R.A.S. AC0024 Adapter cable, 12-pin LEMO to D-sub + 2xBNC
G.R.A.S. KE0122 Serial (D-sub) to USB adapter
G.R.A.S. AI0048 Probe handle
G.R.A.S. AM0376 Windscreen


G.R.A.S. AA0010-S1 3 m LEMO 12-pin - Lemo 12-pin, Cable for Intensity Probe
G.R.A.S. AA0010 10 m LEMO 12-pin - Lemo 12-pin, Cable for Intensity Probe
G.R.A.S. 51AB Intensity Calibrator
G.R.A.S. 42AP Pistonphone with built-in barometerand thermometer (recommended)
G.R.A.S. 42AA Pistonphone
G.R.A.S. RA0024 Two-port Calibration Coupler (for G.R.A.S. 42AP or 42AA Pistonphones)