G.R.A.S. Sound & Vibration
Pistonphone Types 42AA/42AA-S1 - Page 10
3. Handling and Operation
3.1 Shipment and Transport
Before any major shipment where rough handling is to be expected, remove the batteries to pro-
tect connectors and other internal parts from accidental damage.
Before shipment, remove the batteries and wrap separately.
Assure cautious handling during transport.
3.2 Batteries
The Pistonphone runs on four 1.5 V batteries (type AA [LR6]). To install or replace the batteries,
remove the lid of the battery compartment which is held in place by the screw shown in Fig. 3.1.
Slide the lid in the direction shown after removing the screw. Insert four new batteries observing
the correct polarity as indicated on the gure inside the battery compartment.The Pistonphone
can operate continuously for about 20 hours on a new set of batteries.
Remove the battery as soon as it is discharged or if the 42AA is stored for a
prolonged period of time. Leakage from the batteries may otherwise destroy
the electronic components.
3.3 Calibrating Microphones
3.3.1 Microphone Size
The Pistonphone is normally delivered ready to calibrate ½-inch microphones. For ¼-inch and
⅛-inch microphones, special adapters are included and for 1-inch microphones, a 1-inch cou-
pler (available from G.R.A.S.) has to be tted. Each case is described in the following sections.
3.3.2 ½-inch Microphones
To calibrate a ½-inch measurement microphone, rst loosen the microphone retention collar as
shown in Fig. 3.2. Then insert the microphone into the ½-inch coupler
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as shown in Fig. 3.3.
Make sure that the microphone is all the way in, then tighten the microphone retention ring so
that the microphone is held rmly in place.
Fig. 3.1 Access to batteries
Fig. 3.2 Loosening the microphone retention collar
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The ½-inch coupler is individual calibrated with the pistonphone, and these must be considered as a pair
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