High Temperature Probe Microphone Model 377A26
Probe Microphones are compact units designed for use in challenging measurement conditions, such as those found in small cavities, harsh environments, close proximity to the sound source, or in high temperatures up to 800 °C (1472 °F). The acoustic signal is guided to the microphone through a detachable, probe. The high acoustic input impedance of the probe tip minimizes its influence on the acoustic field. Probe Microphones are internally compensated to equalize the static pressure at the probe tip with the internal microphone pressure. Model 377A26 is a prepolarized probe with BNC jack output connector.

In-line “A-weighting” Filter
Model 426B02
The Model 426B02 in-line A-weighting filter is powered by constant current excitation and is compatible with ICP® microphone preamplifiers. When using this filter, however, a minimum of 4 mA excitation current is required of the ICP® sensor signal conditioner or readout device, which incorporates ICP® sensor power.