System Features

• High reliability, low power cost- Uniquely home and abroad, all-Chinese PDA based blue-tooth wireless communication technique controlled receiver. Refined power circuit, fastened sealed mechanical structure, ensure the high reliability, low power cost, and convenience.
• Strong anti-interference- program controlled hardware filter, unique and accurate power supply frequency, and data stack result in strong anti-interference.
• Multi-channel, high accuracy- linear or logarithmic distributed, operator controllable channel number. High accuracy tropic crystal oscillator accomplished timing result in stable and precise time–depth relation. Reasonable sampling window images the true subsurface structure. It is fitted for complex geological problems.
• Quick turnoff transmitter- all transmitters are equipped with quick turnoff switcher. Possibly extended shallow detecting range. Turnoff time function provides interpretation software accurate turnoff time so that resolution is enhanced.
• All-day depth detection- large power transmitter ensures the detecting depth from tens of meters to thousand of meters. Optional small power transmitter fulfills the detection of several meters to tens of meters.
• Friendly and powerful interface- all-Chinese PDA fulfils man-machine interface and sampling control. Parameters setup, data display and storage, plot can be done locally. Fieldwork is easy.
• Simple and convenient synchronization – Transmitter and receiver can be synchronized through synchronization cable, or quartzite clock (optional Transmitter quartzite clock synchronization controller needed).

Technical specifications

　　(1) Receiver

• Channel: 1
• Frequency pass band: 0～50KHz(linear phase filter)
• Industrial frequency depression: ≥80dB
• A/D bit: 16-bit
• Minimum sampling gap: 1μs
• Crystal oscillator frequency difference: ≤5×10-9
• Channel number: ≤50
• Stack number: 1～2048

　　(2) Large power transmitter

• Transmitter voltage: ≤200V
• Transmitter current: ≤50A
• Current measurement accuracy: ±1%
• Power supply frequency: 0.0625Hz、0.125Hz、0.25Hz、0.5Hz、1Hz、 2Hz、4Hz、8Hz、16Hz、32Hz
• Transmitter waveform: +ON、OFF、-ON、OFF，equal width dual polarity wave.
• Turnoff delay measurement: 1μs～1000μs
• Synchronization mode: external (cable)

　　(3) Super-small power transmitter (optional)

• Transmitter voltage: 12V，24V
• Transmitter current: ≤5A
• Current measurement accuracy:±1%
• Power supply frequency: 4Hz、8Hz、16Hz、32Hz
• Transmitter waveform: +ON、OFF、-ON、OFF，equal width dual polarity wave.
• Turnoff delay measurement: 0.1μs～100.0μs
• Synchronization mode: external (cable)

　　(4) Transmitter quartzite clock synchronization controller（optional）

• Crystal oscillator frequency difference: ≤5×10-9

　　(5) Other

• PDA：Pocket PC 2003 system，320×240 true color，64Mb memory (no less than 1000 point data), blue-tooth, infrared, serial ports.
• Battery adapter: 12V，recharging current ≤20A，recharging time: ≤10 hours (manageable)
• Working temperature: -10℃～+50℃

　　(6)Processing software

• 1-D, 2-D inversion software under Windows version. SURFER, data transfer and format transfer. Quick data playback, processing and plotting.