G.R.A.S. 12HM 10-Channel Power Module for Lownoise Systems

Connection: Traditional 200 V
Channel(s): 10

The 12HM provides:

  • polarization voltage (200 V) for up to 10 condenser microphones
  • voltage supplies (±15 V) for powering up to 10 microphone preamplifiers
  • individual response setting, pressure or free field, for each channel
  • individual gain adjustement of ±3 dB for each channel

When connected to the 40HF/40HH/40HT Low-noise Microphone Systems, each channel of the Type 12HM supports the specifications of a G.R.A.S. low-noise measuring system, and can be used in sound-power measurements of low-noise products, such as disk drives, under anechoic or semi-anechoic conditions in accordance with IEC 745:1977.

CONDITIONING .
Output channel(s) 10
Output impedance Ω 30
Type Traditional power supply (LEMO)
Input channel(s), traditional power supply 10
Channel separation (20 Hz to 20 kHz) dB >90
Preamplifier supply V +-15
Polarization voltage V 200
Overload indication Yes
POWER AMPLIFIER .
Power supply, external (±10 %) Vac 115 to 230
Power consumption W 35
Fuse 230 V / 115 V mA 160 / 315
Weight g / oz 5,500 / 194.01