G.R.A.S. Sound & Vibration
Single-channel Low-noise Measuring System consisting of: Type 40HT and Type 12HF - Page 13
4.
Specifications
4.1
½-inch Low-noise Microphone System Type 40HT
Low-noise Microphone System Type 40HT comprising:
½-inch Microphone:
Type 40AH
Preamplifier:
Type 26HH (with 3 m cable and LEMO FGA.1B.307 plug)
Frequency response:
12.5 Hz - 10 kHz
±1.0 dB
10 Hz - 16 kHz:
±2.0 dB
6 Hz - 20 kHz:
+2.0 dB, –3.0 dB
Nominal sensitivity:
System:
800 m V/Pa ±2 dB
Microphone polarization voltage:
200 V
Dynamic range:
Upper limit:
113 dB re. 20 µPa
Lower limit:
6.5 dBA re. 20 µPa (inherent noise)
Microphone capacitance:
20
pF
4.2
Single-channel Power module Type 12HF (separate order)
Input channel:
7-pin LEMO EGA 1B connector
Outputs channel:
BNC socket
Output impedance:
30 Ω
Polarization voltage:
200 V
Power supply:
internal:
6 V from 4 x LR14 (C) standard alkaline cells
external:
6 V - 20 V DC via included Mains Adapter AB0010
Dimensions:
height:
132.6 mm (5¼ in)
width:
34.6 mm (1.3 in)
depth:
196.0 mm (7.7 in)
