Power Module - Type 12AK

Power Module - Type 12AK
The Power Module Type 12AK is a single-channel, battery-operated, microphone power supply, amplifier and filter unit. It has a 7-pin LEMO 1B input connector for a microphone preamplifier and a BNC output socket.

It has both instantaneous and latched overload indicators and a gain that can be set to 0dB, +10dB, +20dB, +30dB, +40dB or +50dB.

The A-weighting network fulfils the requirements of IEC 60651 for Type 0 Sound Level Meters. The high-pass filter is a 3-pole butterworth filter with a cut-off frequency at 20 Hz.

The Type 12AK has a battery indicator to monitor battery condition and an input socket for an external power supply. It also has a built-in 1 kHz precision calibration generator with an adjustable level. The generator can be activated either via a front-panel button or remotely.

The cabinet width is 1/12th of a standard 19” rack. With the rack mounting system Type AK0040, 12 of these Power Modules can be mounted in a standard 19” rack.

19" Rack-mounting System AK0040
The AK0040 is a shelf for mounting instrument cabinets, e.g. G.R.A.S. Power Modules, and can itself be mounted in a standard 19" instrumentation rack via its flanges. It can house instruments 133 mm high and is wide enough to contain instruments amounting up to a total width of 430 mm.

Specifications Type 12AK
Input channel:
7-pin LEMO 1B connector
Outputs channel:
BNC socket
Gain settings:
0 dB, +10 dB, +20 dB, 
+30 dB, +40 dB, +50 dB
Preamplifier supply:
28 V or 120 V
Polarisation voltage:
0 V or 200 V
Frequency response:
3.5 Hz - 200 kHz
A-weighting network:
IEC 60651 Type 0
Output impedance:
30 Ohm
Power supply:
10 × AA alkaline batteries or 12 - 18 V DC mains/line adaptor for 220/115 V
height: 132.6 mm
width: 34.6 mm
depth: 196 mm
770 g
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