Features

• One machine with multi-function: The WTEM-1J/GPS TEM exploration system receiver could be applied together with the large power transmitter WTEM-1D for deep exploration, also could be applied together with small power transmitter WTEM-1X for shallow exploration.

• Advanced synchronous mode: cable synchronous mode and GPS synchronous, synchronous speediness、simplicity of operation.

• High reliability, low power cost- Refined power circuit, fastened sealed mechanical structure, ensure the high reliability, low power cost, and convenience.

• Uniquely home and abroad, all-Chinese PDA based blue-tooth wireless communication technique controlled receiver.

• 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.

• 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.

  
  

Technical specifications

1. WTEM-1J/GPS TEM exploration system receiver
□ Channel number: 1
□ Pre-amplifier gain: 8,32 times
□ Main amplifier gain: 1,2,4,8,16,32,64,128 times
□ Band pass: 0~50kHz (liner phased filter), full band 0~400kHz.
□ A/D bit: 16 bit
□ The minimum sample interval: 1μs
□ Crystal oscillation total error: ≤5x10-9
□ Trace number: 50
□ Stack number: 1~9999
□ Synchronization mode: (1) cable synchronization (2) GPS synchronization
□ Power supply: built-in 12V rechargeable battery (support outside power), working time>10 hours
□ Pocket PC: pocket PC 2003 system, 320x240 real-color, 64MB Flash Rom/ 64MB SDRAM, CF card, store more than 100000 sampling points. Blue-tooth, infrared, serial port.
□ Dimensions (L×W×H): 340 mm×260 mm×140 mm
□ Weight: 6kg
□ Working temperature :-10℃~50℃

2. WTEM-1D 10KW Large Power Transmitter
□ Transmitting voltage: 200V
□ Transmitting current: 50A
□ Current measurement precision: 1%
□ Power supply frequencies: 0.0625Hz, 0.125 Hz, 0.25 Hz, 0.5 Hz, 1 Hz, 2 Hz, 4 Hz, 8 Hz, 16 Hz, 32 Hz.
□ Transmitting wave: equal width and dual polarity, +ON, OFF, -ON, OFF.
□ Switch-off time measurement range: 1μs~1000μs
□ Switch-off time: ≤1.2μs (pure resistance), changed with the transmitting current and transmitting loop when connected to loops
□ Transmitting loop: 0.1kmx0.1km to 2kmx2km for a single cycle.
□ Synchronization mode: (cable, quartz clock, GPS)
□ Transmitting power voltage display: liquid crystal display unit V, display resolution 0.1 V.
□ LED index: power switch-on, positive supply, negative supply, over-power, over-heat, internal voltage shortage
□ Data storage: capable of data saving of month, date, hour, minute, transmitting current, switch-off time to storage by setting interval. No more than 8000 data points.
□ RS-232 standard serial port: transfer the data (month, date, hour, minute, transmitting current, switch-off time) to computer for later processing
□ Power: built-in 12V rechargeable battery (support outside power), working time>10 hours
□ Dimensions: 525mmx436mmx217mm
□ Weight: 18.5kg
□ Working temperature :-10℃~50℃
□ Storage temperature:-20℃～+70℃

3. WTEM-1X low power transmitter（optional fittings）
□ Transmitter voltage input: 12V，24V
□ Transmitter voltage: ① 5.5V～ 8V（Transmitter voltage input 12V）continuous adjustable
　　　　　　　　　　　　② 5.5V～20V（Transmitter voltage input 24V）continuous adjustable
□ Transmitter current: ≤10A
□ Current measurement accuracy:±1%
□ Power supply frequency: 4Hz、8Hz、16Hz、32Hz
□ Transmitter waveform: +ON、OFF、-ON、OFF，equal width dual polarity wave.
□ Turn off delay measurement: 0.1μs～100.0μs
□ Typical turn off time: 2.5μs @ Transmitter current 3A，Energizing loop: 40m×40m single turn
　　　　　　　　　　　　　　　Energizing loop: 5m×5m single turn～100m×100m single turn
□ Programmed control damping resistance: 50Ω～1600Ω，50Ω step size programmable.
□ Synchronization mode: external (cable)
□ Dimensions (L×W×H): 406mm×330mm×174mm
□ Weight: 7kg
□ working temperature :-10℃~+50℃

4. WTEM-1T/GPS Transmitter Synchronized Controller（optional fittings）
□ Satellite number: 12
□ Synchronization time needed: 2min
□ Synchronization error: 250ns
□ Optional frequencies:1/16Hz,1/8Hz,1/4Hz,1/2Hz,1Hz,2Hz,4Hz,6Hz,8Hz,16Hz,32Hz
□ Working current: 120mA
□ Power: built-in 12V rechargeable battery (support outside power), working time>50 hours
□ Dimensions (L×W×H): 320mmx240mmx180mm
□ Weight: 5kg
□ working temperature :-10℃~+50℃