Chongqing Gold Mechanical & Electrical Equipment Co.,Ltd
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WDJD-4A New Generation Insulation Resistance Tester Induce Polarization Test Multifunction Tester
What's the WDJD-4A Multiple Function DC resistivity meter?
WDJD-4A Multi-Function Digital DC Resistivity/IP Meter , based on WDJD-3A, meets user’s most and latest needs. It features multiple functions, high accuracy, fast speed, high reliability and excellent expandability. Measured data of WDJD-4A can be processed by other multi-electrode resistivity software, which makes the interpretation more convenient. The single WDJD-4A can conduct general electrical resistivity/IP survey. If WDJD-4A is used together with WDZJ-4 multiplex electrode switcher (hereafter also referred to as WDZJ or WDZJ-4 switcher), it can conduct multi-electrode 2D Resistivity imaging.
What's can WDJD-4A measure?
(1)If you conduct general (1D) electrical resistivity survey, system configuration and layout is as shown in Fig.2-1. The system consists of one WDJD-4A mainframe, electrodes, transmitting power source.
Positive pole (red) of the transmitting power source connects to the “DC HV +” terminal (red, positive terminal) of WDJD-4A.
Negative pole (black) of the transmitting power source connects to the “DC HV –” (black, negative terminal) of WDJD-4A.
Electrode A and B connect respectively to A, B terminals, and potential electrodes M and N respectively to M, N connecting terminal
(2)If you conduct general (1D) induced polarization (IP) survey, system configuration and layout is as shown in Fig. 2-2. The system consists of one WDJD-4A mainframe, electrodes, solid non-polarized electrodes, transmitting power source.
Positive pole (red) of the transmitting power source connects to the “DC HV +” terminal (red, positive terminal) of WDJD-4A.
Negative pole (voltage, in black) of the transmitting power source connects to the “DC HV –” (black, negative terminal) of WDJD-4A.
Electrode A and B connect respectively to A, B connecting terminals
Solid non-polarized electrode M and N connect respectively to M, N connecting terminal. For use and maintaining of solid non-polarized electrode, please refer to Appendix
Application of the WDJD-4A?
Application of WDJD-4A can be in metal and nonmetal mineral resources detection, city geophysical exploration, railway and bridge inspection and so on; as well as in hydrology and engineering geology such as seeking for ground water, inspect dam base and flood protection levee for incipient faults.
Technical specification:
| Receiving part | |
| Voltage precision | ±24V, ±0.4% ±1LSB, 24 bit A/D |
| Input impedance | ≥50MΩ |
| Apparent polarizability precision | ±1% ±1LSB |
| SP compensation range | ±10V |
| Current channel | 6A, ±0.4% ±1LSB, 24 bit A/D |
| Resolution | Voltage: 0.1 micro volt, Current: 0.2 micro ampere |
| Suppression | ≥80dB for 50Hz industrial frequency(common mode interference or differential mode interference) |
| Transmitter part | |
| Maximum power | For general Res/IP sounding, 6600W. For mulit-eletrode Res imaging, 1125W, limited by WDZJ-4 switcher For Res cable, 1350W For IP cable, 2400W |
| Maximum supply voltage | For general Res/IP sounding, ±1100V(2200V peak to peak) For multi-electrode Res/IP imaging, 450V DC(limited by WDZJ-4 switcher) |
| Maximum supply current | For general Res/IP sounding, ±6A For multi-electrode Res imaging, 2.5A DC(limited by WDZJ-4 switcher) |
| Pulse width | 1~60s, duty rate 1:1 |
| Others | |
| Display | 160*160 dot matrix LCD |
| Storage | ≤1GB |
| Working temperature | -10℃~+50℃, 95% RH |
| Storage temperature | -20℃~+60℃ |
| Instrument power | Internal 12V 9Ah rechargeable battery, lasts for 30 hours(or 12V external power supply) |
| Weight | ≤4.4kg |
| Dimension(L*W*H) | 270mm*246mm*175mm |
Standardconfiguration list of WDJD-4A
| No. | Details | Qty |
| 1 | WDJD-4 mainframe | 1 set |
| 2 | USB communication line | 1 set |
| 3 | Charger | 1 PC |
| 4 | 12V power input line | 1 PC |
| 5 | Instrument backpack | 1 PC |
| 6 | Windows software U Disk | 1 PC |
| 7 | Operational manual | 1 PC |
| 8 | Unpolarized electrodes | 1 Pair |
| 9 | Iron electrodes | 10 PCs |
Shipping and delivery
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Company Profile
Chongqing Gold Mechanical & Electrical Equipment Co., Ltd is specialized in manufacturing and developing of Geophysical Exploration Instrument such as Resistivity Meter, IP Instrument, Resistivity Image, Seismic Instrument, Electromagnetic Instrument, Borehole Camera, Borehole Logging System, Water Level Meter; Borehole Drilling Equipment including Core/ Water Well/ Tunnel/ Engineering/ Anchor Drilling Rigs&Accessory and Geodetic Surveying Instrument(GNSS RTK System, Total Station, GIS Mapping and Echo Sounder).
Our service
1. We provide one-year warranty, during this period, we are responsible for any mechanical failures or faults caused by design technology or material and handle any improper errors for free; we will still provide free technical assistance beyond this period (only charge parts' cost price and traveling allowance).
2. If there are any failures because of our products' quality in use, we will provide the phone instructions within 2 hours to help solving the problems, and we will supply on-line video technical communication if necessary.
3. We can dispatch the experienced engineer for installation and debugging after receiving the customer's notification.
4. We will provide free training, installation, debugging service in China, it is also available to send professional staff overseas for installation and debugging, only the traveling costs and labor costs will be borne by you.
5. After sale, we provide regular phone service to collect the customer's suggestions and advice.