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Aerogage HB-01 Instruction Manual

Hiband amplifier
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Model HB-01
HiBand Amplifier
Instruction Manual
Rev: 01
8/6/02
1

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Summary of Contents for Aerogage HB-01

  • Page 1 Model HB-01 HiBand Amplifier Instruction Manual Rev: 01 8/6/02...

  • Page 2: Principle Of Operation

    100 volts for biasing the capacitive probe. The change in the amplifier output voltage is proportional to the change in the capacitance of the probe. The output stage of the HB-01 is capable of driving 50-ohm cables up to 1000 feet or more in length.
  • Page 3 HB-01. As a result, the length of the coaxial cable between the HB-01 and any A/D converter or data acquisition system can be quite large: at least 1000 feet, if desired.
  • Page 4 The result of all the shielding is that the noise at the output of the HB-01 due to the switching converter is considerably less than the noise due to the preamp input stage.
  • Page 5 Input/Output Connections Figure 3 shows the input and output connectors for the HB-01. The input to the HB-01 is a BNC connector for connecting a coaxial cable to the capacitive probe. The output to the HB-01 is a BNC cable for connecting a coaxial cable to the data acquisition system. A cable with a characteristic impedance of 50 ohms is recommended.
  • Page 6 Output: Coaxial Cable to A/D Input: Coaxial Cable from Cap Probe Input: Power Cable from Power Supply Figure 3. Input/Output Connections to HB-01 Power requirements for the HB-01 are: Input connected to Capacitive Probe: Voltage Current (typical) + 15 volts...

  • Page 7: Safety Issues

    Turn-On Delay When power is first applied to the HB-01, the high-voltage switching power supply must charge up to 100 volts. During this time, the output of the HB-01 will be saturated at approximately +/- 4 volts. The dc voltage for the capacitive probe reaches approximately 90 volts in about 1-2 minutes, at which point the amplitude of the output pulses due to targets passing in front of the probe are at approximately 90% of their final value.
  • Page 8 If the impedance of the probe is less than about 35 K ohms, the HB-01 cannot maintain a 100-volt bias on the probe. If this occurs, check the probe and the probe cable. 4. If the output of the HB-01 appears excessively noisy, disconnect the probe cable at the input to the HB-01 and recheck the output noise.

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