G.R.A.S. SOUND & VIBRATION
Power Module Type 12AQ
Page 10
Fig. 2.3 7-pin LEMO female socket 1B
(external
view)
Fig. 2.4 9-pin female D-sub connector socket for
connecting directly to an RS232 computer
port
(external
view)
SysCheck
Adjustment potentiometer
Use a small screwdriver to adjust the level of the SysCheck signal applied to pin 1 (see Fig. 2.3) of
this
Mic .
Input
socket. Signal adjustment ranges from 0 to 5.6 V RMS.
The SysCheck signal is activated via the
SysCheck
button on the front panel (Fig. 2.1) or via the
syschk
command.
CCP Input
BNC input socket for driving IEPE transducers such as G.R.A.S. CCP Preamplifiers Type 26CB
(¼″) and Type 26CA (½″), as well as G.R.A.S. Array Microphones. Source voltage and current are
respectively 28 V and 4 mA.
Mic . Input
7-pin LEMO input connector for microphone preamplifier. Wiring diagram shown in Fig. 2.3.
Output
BNC socket for the output signal via the current settings of the conditioning amplifier.
Ext . Supply
Input socket for an external power supply of 8 - 18 V DC; centre pin +terminal. The use of an exter-
nal power supply automatically disables power from the batteries.
RS232
9-pin female D-sub connector socket for connecting directly to an RS232 computer port. Wiring
diagram shown in Fig. 2.4.
