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3.3. 2. Connecting an Accelerometer
Special adaptors JJ 2614 and JP 0028 required to connect the miniature plug of the ac-
celerometer cable to the Preamplifier Type 2642 as shown in Fig.3.4. The adaptor JP
0028 is supplied with accelerometer sets.
Fig. 3. 4.
Connecting an accelerometer to the Preamplifier Type 2642 using special adaptors JJ 2614 and
JP 0028
3.3.3. Connecting External Signal Sources
An adaptor JJ 2614 allows an external source, such as a sinewave generator or output
from an accelerometer preamplifier for example, to be connected via a standard B
&
K
plug to the Type 2642 Preamplifier. See Fig.3.5.
Fig. 3. 5.
Connecting an external signal source to the Preamplifier using special adaptor JJ 2614
3.4. CONNECTING THE EXCITATION SOURCE
Connection of the signal from the external generator to the excitation source is via the
socket labelled OUTPUT on the rear panel of the instrument.
The corresponding 4-pin DIN plug of the output cable is secured by a threaded locking
ring. The pin connections are shown in Fig.3.6
.
The external source of excitation may be a loudspeaker, for example that in the Ane-
choic Test Chamber Type 4222 for testing the performance of hearing aids, a small vi-
brator, e.g. for testing bone vibrators, or a telephone or headphone earpiece
.
Ground
790346
Fig. 3. 6.
Pin connections of the OUTPUT socket viewed looking into
the socket or from the soldering side of the corresponding
plug
3.5. MOUNTING THE PEN
14
The 211 6 uses a fibre pen which is mounted as follows:
1.
At the end of the writing arm is a plastic holder. (See Fig.3.7.) If a pen is already
mounted, slide it off the end of the pen holder gently but firmly, while holding the
writing arm in position at the top of its travel.
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