GRAS 12AL 1-Channel CCP Power Module with A-weighting filter

Connection: CCP
Channel(s): 1

Technology

Typical applications and use

  • Power supply for CCP transducers and preamplifiers
  • General-purposes measurements
  • Precision measurements
  • Wide-band measurements
  • Switchable A-weighting network
  • Low noise
  • Battery operated

Design

The 12AL will supply a transducer with a constant current of 4 mA. It has a wide operating frequency range from about 1 Hz (depending on load impedance) to well over 200 kHz. It also has an A-weighting filter which can be switched in or out.

The 12AL can be powered either by two internal AA alkaline batteries or from an external DC supply of 3 - 6 V. A regulated mains/line adapter AB0005 is available for supplying external DC power.

LEDs are used to indicate battery condition; green for power OK and red for battery low. Another red LED is used to indicate cable break, short circuit and overload.

The 12AL has zero gain since the output signal from the transducer is wired directly via 22 μF to the output connector. Zero gain is also preserved at 1 kHz when the A-weighting network has been switched in.

The size and weight of the 12AL make it a compact and handy power supply for CCP transducers both in the laboratory and in the field.

Warranty

All GRAS products are made of high-quality materials that will ensure life-long stability and robustness. The 12AL is delivered with a 2-year warranty. The warranty does not cover products that are damaged due to negligent use.

Service and Repairs

All repairs are made at GRAS International Support Center located in Denmark. Our Support Center is equipped with the newest test equipment and staffed with dedicated and highly skilled engineers. Upon request, we make cost estimates based on fixed repair categories. If a product covered by warranty is sent for service, it is repaired free of charge, unless the damage is the result of negligent use or other violations of the warranty.

Specifications

CONDITIONING
.
Frequency response (±3.0 dB) (with 10 kΩ load)
Hz
0.7 to 200 k
Frequency response (±3.0 dB) (with 100 kΩ load)
Hz
0.07 to 200 k
Output channel(s)
1
Output impedance, with A-weighting
Ω
100 in serial with 22µF
Output impedance, without A-weighting
Ω
As source in serial with 22µF
Direct coupling input to output
No
Inherent noise, A-filter "on" and with dummy microphone (20 Hz to 20 kHz),
µVrms
15
Inherent noise, A-filter "off" and with dummy microphone (20 Hz to 20 kHz),
µVrms
4
A-weighting filter according to
IEC 61651 Type 0
Linear mode
Yes
Type
Constant Current Power (CCP)
Input channel, CCP
1
Input channel(s), traditional power supply
1
CCP preamplifier supply @ +28 V
mA
4
Overload indication
Yes
PC controlable
No
External filter option
No
Power amplifier overload detection
No
POWER SUPPLY
.
Power supply, battery
2 x LR6 (AA)
Power supply, external
Vdc
3 to 6
Power consumption
mA
50 to 120
Battery life
h
24
Battery low indication
No
Weight
g / oz
110.00 / 3.88
Weight with batteries
g / oz
160 / 5,6
Specification Conditions

GRAS Sound & Vibration reserves the right to change specifications and accessories without notice.

Ordering info

GRAS AB0005 Mains/line adapter

 

GRAS Sound & Vibration reserves the right to change specifications and accessories without notice.

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