Inficon WHISPER - Whisper Heterodyne Feature for Sound Isolation; Using the Whisper Laser Pointer for Pinpointing; Operating Whisper in High Noise Environments

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Heterodyne Feature
Whisper features heterodyne capability, which converts the ultrasonic frequencies
to sounds that can be heard by the human ear. This allows you to easily isolate
the ultrasonic source.
Plug the included headphones into the jack on the right side of Whisper to enable
heterodyne capability. Dragging your finger upward/downward on the sensitivity
touch pad will increase/decrease the volume of the headphones.
NOTE: Sensitivity defaults to a lower level when headphones are plugged in to
protect against hearing damage. Use the touch pad to increase sensitivity
if needed.
Laser Pointer Feature
Whisper (if equipped) features an integrated laser pointer. This feature is
designed to aid in pinpointing leak sites. To enable/disable the laser pointer
feature, briefly press the power button. The laser pointer will automatically disable
if Whisper is turned Off.
NOTE: Laser pointer not available in Japan.
WARNING
Do not aim the laser pointer at any person or animal.
High Noise Environments
In noisy environments, it may be necessary to “tune out” unwanted signals from
other areas in close proximity to where you are scanning for leaks. Begin by
pushing the rubber extension probe over the nose piece. When the extension is
attached, Whisper’s sensing angle is reduced, increasing the directional capability
and reducing the effects of the adjacent noise sources. This allows Whisper's
detection capabilities to become more directional. If you suspect the reading
originates from a source other than what you are scanning, point the probe toward
the suspected source (maybe a compressor, V-belt, discharging steam line, etc.)
and slowly decrease sensitivity until the alarm stops. Turn the probe back in the
direction of the suspected leak and continue to scan. This step may have to be
repeated as you move around to other locations in search of leaks. If the probe is
close to internal moving parts of equipment, and the alarm sounds, push the
rubber probe against the equipment housing. If the alarm still sounds, internal
friction of moving parts, and not a leak source, may be causing the alarm.