Duplex RDX
In order to separate the excitation high voltage signal from the weak voltage signal from the probe, a duplexer is needed to isolate the high voltage amplifier and preamplifier.
Advantages and Characteristics
Bandwidth: 50 KHz-40 MHz
Low input/output impedance: 50 ohms
port
|
IN port |
Connect the high-voltage amplifier or ultrasonic transmitter port |
|
OUT port |
Connect the ultrasound probe |
|
ToREC port |
Connect the preamplifier, oscilloscope/acquisition card or ultrasonic receiver port |
Panel switch
|
IN/OUT switch |
Noise suppression switch |
|
0 dB/1dB switch |
Impedance modulation attenuator |
|
0 dB/2dB switch |
Impedance modulation attenuator |
Panel damping adjustment knob
|
Position |
Damping Resistor |
|
name |
Damping resistor |
|
1 |
1300 Ohms |
|
2 |
619 Ohms |
|
3 |
310 Ohms |
|
4 |
162 Ohms |
|
5 |
80 Ohms |
|
6 |
41 Ohms |
|
7 |
22 Ohms |
|
8 |
10 Ohms |
Panel low-frequency filter knob
|
Position |
Inductance |
Approx. 3 dB point |
|
name |
inductance |
3dB frequency point |
|
A |
Open |
30 kHz |
|
B |
27μH |
275 kHz |
|
C |
10μH |
750 kHz |
|
D |
4.7μH |
1.6 MHz |
|
E |
2.2μH |
3.4 MHz |
|
F |
1 μH |
7.5 MHz |
|
G |
0.47μH |
16 MHz |
|
H |
0.22μH |
34 MHz |
