Type 40GI/40GK

Type 40GI/40GK
Prepolarized Sound-intensity Pair Type 40GK
The Type 40GK is a complete set of two phase-matched ½" intensity microphones, solid spacers and adapters for a pair of ¼" Preamplifiers Type 26CB. The microphones have a free field response optimised for use in face-to-face configuration intensity probes and have high a sensitivity to enable low-level measurements.

The pair of microphones fulfil the phase requirements for Class 1 intensity microphones according to IEC International Standard 1043. The Type 40GK includes solid spacers for intensity-probe configurations with 12 mm, 25 mm, 50 mm and 100 mm microphone separations to cover the full frequency range from 50 Hz up to 10 kHz, even under the most adverse measurement conditions.

The 40GK also includes one straight and two right-angled adapters to connect the microphones with a pair of ¼" Preamplifiers such as the Type 26CB.

½" Sound-intensity Pair Type 40GI
A pair of phase-matched ½" intensity microphones similar to the Type 40GK but without spacers and adapters for ¼" preamplifiers. The Type 40GI is used in the G.R.A.S. Intensity Probe Type 50GI.
Specifications Type 40GI / 40GK
12.5 mV/Pa
Upper limiting dynamic range:
<23 - 154 dB re. 20µPa (< 1% THD at 100 Hz)
Frequency response:
IEC 60651 Type 0
Phase response:
IEC 1043 Class 1
Polarisation voltage:
0 V
13.2 mm
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