Acoustic Ground Detector
Technical data: ZEB/HG-1U
Ground-borne sound transducer
1 three-directional frequency detector 1/14 (3 geophones), natural (characteristic)
frequency 14 Hz ± 5%
The three geophones are mechanically coupled and housed in an aluminium block of at least 1 kg.
Connector: waterproof jack
Control unit
On-Off switch, volume control
On-Off switch for filter
Control for low pass: approx. 3 kHz – 20 Hz
Control for high pass: approx. 20 Hz – 3 kHz
Airborne sound transducer
1 airborne sound microphone MS, equally suitable as loudspeaker, for introduction into a communication borehole of 45 mm diameter
Power supply
4 dry batteries 1.5 V type MIGNON LR6
Rechargeable batteries incl. charger as an option
Connection cables
10 m shielded measuring cable, pull-relieved, with a waterproof connecting plug to connect the probe or the microphone-loudspeaker
Headphones
One pair of headphones with build-in microphone and coiled cord for intercom facility
Amplifier
Housed in an aluminium casing with shoulder strap
Amplification: max. 114 dB
Frequency response: > 10 Hz – 10 kHz ± 3 dB
input impedance: apporx. 1 kΩ
Signal-to-noise ratio: ≥ 70 dB
Distortion factor: < 0,5 %
One input, one jack for headphones/microphone headset.
Temperature range
-20 °C up to +60 °C
Transport casing
One plastic case, all parts fixed in supports. Dimensions of case: approx. 460 x 310 x 150 mm, Weight: approx. 5 kg
Technical data: ZEB/HG-1S
Ground-borne sound transducer
1 three-directional frequency detector 1/30 (3 geophones), natural (characteristic)
frequency 30 Hz ± 5%
1 three-directional frequency detector LF (3 geophones), natural (characteristic)
frequency 4.5 Hz ± 5%
The three geophones are mechanically coupled and housed in an aluminium
block of at least 1 kg.
Connector: waterproof jack
Control unit
On-Off switch, volume control, selector switch for ground-borne and airborne sound transducers On-Off switch for filter Control for low pass: approx. 3 kHz – 20 Hz Control for high pass: approx. 20 Hz – 3 kHz Combination switch to select a piezo transducer with approx. 2.5 kHz for ground-borne sound with frequencies between 2 Hz up to the auditory sensation area of the human ear or selection of an optical indication (LED-display) Push-to-talk switch for intercom facility
Airborne sound transducer
1 airborne sound microphone MS, equally suitable as loudspeaker, for introduction into a communication borehole of 45 mm diameter The 3 probes are supplied with 3 special cable drums each 20 m cable and lateral supports for stowing away and for the transport of the probes.
Power supply
2 dry batteries 9 V type BLOCK 6F22 Rechargeable batteries incl. charger as an option
Connection cables
Shielded measuring cable, pull-relieved, with a waterproof connecting plug to connect the probe or the microphone-loudspeaker
Headphones
One pair of headphones with build-in microphone and coiled cord for intercom facility
Amplifier
Housed in an aluminium casing with shoulder strap Amplification: max. 120 dB Frequency response: > 2 Hz – 3 kHz ± 3 dB input impedance: approx. 4.7 kΩ Signal-to-noise ratio: ≥ 70 dB Distortion factor: < 0,5 % Inputs mechanically non interchangeable, one jack for headphones/microphone headset.
Temperature range
-20 °C up to +50 °C
Transport casing
One aluminium case, all parts fixed in supports. Dimensions of case: approx. 520 x 520 x 325 mm, Weight approx. 20 kg
Technical data: ZEB/HG-6U
Ground-borne sound transducer
6 three-directional frequency detector 1/30 (6×3 geophones), natural (characteristic)
frequency 30 Hz ± 5%
1 three-directional frequency detector LF (3 geophones), natural (characteristic)
frequency 4.5 Hz ± 5%
The three geophones are mechanically coupled and housed in an aluminium
block of at least 1 kg.
Connector: waterproof jack
Control unit
On-Off switch, volume control, selector switch for ground-borne and airborne sound transducers (summing-up and individual listening mode) On-Off switch for filter Control for low pass: approx. 3 kHz – 20 Hz Control for high pass: approx. 20 Hz – 3 kHz Switch to select a piezo transducer with approx.
2.5 kHz for ground-borne sound transducer, aural perception of ground-borne sound with frequencies between 2 Hz up to the auditory sensation area of the human ear. Push-to-talk switch for intercom facility. The input levels of the 6 ground-borne sound transducers are alternatively displayed by means of an LCD bar-graph display. For comparison of the input levels, the unit possesses a hold function for the actual peak value. Reset switch to erase the peak values.
Airborne sound transducer
1 airborne sound microphone MS, equally suitable as loudspeaker, for introduction into a communication borehole of 45 mm diameter
Power supply
4 dry batteries 1.5 V type MONO LR20
An external power supply is available by means of the power supply cable and the “9-24 VDC”.input jack. The DC-voltage must be between 9 V and 24 V. Automobile-connection-set, external power supply unit and rechargeable batteries incl. charger as an option
Connection cables
The cables (6 x 5 m and 2 x 20 m) are packed in 4 canvas bags. A cable coupling (T-connector) enables the realisation of two chains with the 30 Hz-geophones
The LF- and MS-probes are provided with 20 m pull-relieved and waterproof cable housed in a cable drum with support. Reflecting cables as an option.
Headphones
One pair of headphones with build-in microphone and coiled cord for intercom facility and a pair of headphones of the same type without microphone.
Amplifier
Housed in an aluminium casing with shoulder strap
Amplification: max. 120 dB
Frequency response: > 2 Hz – 3 kHz ± 3 dB
input impedance: approx. 4.7 kΩ
Signal-to-noise ratio: ≥ 70 dB
Distortion factor: < 0,5 %
Inputs mechanically non interchangeable, one jack for headphones/microphone headset.
Temperature range
-20 °C up to +50 °C
Transport casing
Two aluminium case, all parts fixed in supports. Dimensions of case A: approx. 600 x 400 x 250 mm, Weight approx. 20 kg Dimensions of case B: approx. 600 x 400 x 340 mm, Weight approx. 25 kg