33
LI0083 – Revision 22 June 2017
Technical Specifications
All outputs except speaker amp. output have fixed 100 kHz (3 dB) low pass filters to minimize
the need for anti-aliasing filtering in the following analyzing equipment.
There is no phase shift between microphone input and output due to prepolarized or external
polarized microphones. It is designed with no relays in the signal path.
Microphone section
Input for externally polarized microphone
7 pin LEMO 1B series
Input impedance
100 k
Ω
LEMO preamplifier supply
±15 V
Input for prepolarized microphone
BNC
CCP preamplifier supply
4 mA
Polarization voltage
200 V/0 V
Output
BNC floating
(2 k
Ω
//100 nF to power ground)
Output impedance
100
Ω
Gain
0 – 50 dB in 10 dB steps (±0.2 dB)
(remote controlled)
Bandwidth (-3 dB)
1 Hz – 100 kHz
Noise floor (relative to input)
Input shorted (
≥
20 dB gain)
Input loaded with 20 pF dummy mic.
<1.5 μVrms (20 Hz – 20 kHz)
<5 μVrms (20 Hz – 20 kHz)
High pass filter (remote controlled)
1.order
Butterworth 3. order
1 Hz
20 Hz
Overload detection
LED indicators (remote controlled)
Speaker-amplifier section
Amplifier Input connector
BNC floating
(10 k
Ω
//100 nF to power ground)
Input impedance
10 k
Ω
Amplifier output connector
2 pin Lemo (pin 1 is output, pin 2 is return)
Current output connector (remote controlled)
BNC floating
(2 k
Ω
//100 nF to power ground)
Gain (remote controlled)
–20 db to +10 dB in 10 dB steps (±0.2 dB)
Bandwidth (-3dB)
(remote controlled AC or DC coupling)
DC coupled: DC to 80 kHz
AC coupled: 10 Hz – 80 kHz
Phase shift (input to output)
≤
±1° (DC to 20 kHz)
Max output voltage
±13.5 V
Max output current
±1.4 A
