7
LI0056 – Revision 28 May 2015
Removing and Installing the Microphone
This section describes how to remove and install the microphone, for example, when
you need to calibrate it.
The main user-accessible parts of the blast probe are shown in Fig. 5. The two tube
parts are held in place with a short M2 hex screw (item 3) and an O-ring in a recess
inside the front part (Item 1).
Disconnecting the Two Parts of the Tube
1. Loosen the short M2 hex screw (item 3).
2. Pull the two halves apart. Because of the drag provided by the O-ring (item 7),
you may have to wriggle the parts slightly while pulling. Do not use excessive
force.
4
8
2
3
6
5
1
7
The parts of the probe as shown in Fig. 5 are
1.
Probe tube – front.
5.
Probe tube – rear.
2.
Long M2 hex screw (for 1.5 mm hex
key) for securing the microphone assem-
bly against the tube wall.
6.
Clamp for microphone assembly.
Note:
This clamp is only shown outside
the front tube for clarity; it is actually fixed
inside the tube where it holds the micro-
phone in place.
3.
Short M2 hex screw for securing the
two halves of the blast probe.
7.
O-ring.
4.
Microphone/preamplifier assembly.
8.
Hole for microphone.
Fig. 5.
Exploded view of the blast probe.