Search result for:  id10=WA 0821 1305 0400 Rental Handheld XRF Mineral Analyzer Brebes Jawa Tengah [[Tiga Pillar]]

General information The most common symptoms of intermittent connection issues are shown below: D_CY shows a background decay signal is either much higher than normal, and/or C_CY is a flat line (doesn’t decay). Figure 1 Intermittent connection issue. Where is the failure occurring? The two most common places where intermittent issues occur are at the two ends of the Rx cable: the joint between the Rx cable and the Cart and the joint between the Rx cable and the EDA box (orange box). Now we need to identify which joint has the intermittent issue. Set up the MM2x2 in DAM mode. Collect DAM data while keeping the Cart stationary but tapping one joint. Collect another DAM data while tapping the other joint. Analyze the DAM data by plotting the “Monostatic_5” for all 12 Rx channels in Geosoft. The channels having intermittent issues will appear much noisier. If you have MatLab software, you can download the MatLab code to analyze the DAM data. Example plots are shown below. It is obvious that “ZA” channel has the intermittent issue in Figure 2 and “XB” channel is open in Figure 3 (very flat line, no noise at all). Click here to download the code: Attachment : Intermittent_noise_full.zip . If both DAM and IVS data have the same problematic channel(s), we are confident that the intermittent issues observed in IVS data are repeated in DAM data, and by tapping at that location, we are able to identify the intermittent joint. Figure 2 Intermittent "ZA" channel. Figure 3 Open "XB" channel. What to do next? Disconnect the problematic joint and clean the connectors on both sides thoroughly (using an acid brush and a can of compressed air). Reconnect and try the tapping method again. If the problem goes away (no more noisy channels), the intermittent issue is likely caused by dust. If cleaning doesn’t fix the problem, swap out the Rx cable and repeat the tapping method. If the problem goes away, it is likely caused by a bad Rx cable. If there is another set of EDA and Cart available, swap out the EDA and the Cart to identify the problematic part. If not, use the tapping location to identify the problematic part. Fill out the RMA form at . If it is the Cart, send in the whole system for inspection/repair. You can contact Geometrics for MM2x2 Rental if you need to continue your work during the down time. If it is the EDA, we recommend sending in the EDA only. It will save your repair time since it is much faster to unpack/pack/ship the EDA than the whole system. You can contact Geometrics for EDA Rental if you need to continue your work during the down time. Warning Please note that this tapping method should ONLY be tried when intermittent issues have been observed in IVS tests. It is NOT recommended to use it as a daily QC test because it does put extra stress on connectors and likely leads to a shortened connector lifetime if applied too often.

List of approved fluids is as follows: n-Decane Shell Sol-71 (Shell oil product) Isopar-G (Exxon oil Co.) Odorless Mineral sprits (Naptha) Mineral Spirits (Naptha) Charcoal Lighter Fluid Kerosene lamp oil Kerosene Mineral Oil (medicinal Grade) Diesel Fuel (may degrade diaphragm on marine systems) Camp Stove fuel White Gas Unleaded gas The preferred fluids are items 1-7 above. Items 3 & 4 are not the same as paint thinner. Paint thinner will damage the sensor coils, as will Acetone, and should not be used. Items 11 - 13 have a very low flash point and should be used with extra caution, although any petroleum product must be handled carefully. There are several Alcohols which will produce an acceptable signal, but will tend to absorb water. This will degrade the performance of the sensor over time. These should be replaced as soon as possible with an alternate fluid from the above list. Usable alcohols: Ethanol (Grain Alcohol) at least 190 proof Methanol (wood alcohol) Denatured Alcohol (ethanol made poisonous) All of these fluids must be as clean as possible to ensure that no water or contaminates (rust) are in them. Use a filter to make sure the fluids do not contain rust from the storage container.

A common question many have with magnetic surveys is "How wide of a survey swath does a single magnetometer sensor cover on a single pass?" The answer is it depends on what is being searched for. Magnetometers are passive instruments, meaning they don’t actively send out signals or have a limited swath or depth of exploration. When planning a magnetic survey the grid (line spacing and waypoint spacing) should be designed using the best possible model of the target. There are some general rules of thumb that can be used to determine typical detection ranges for common iron objects. For example, a 10lb sledgehammer has been lost and needs to be found, and assuming this is 10lbs of pure iron, it would be expected to see a 1nT anomaly when the magnetometer sensor passes 6 meters over the top of the tool. Knowing this, survey line spacings should not be any narrower than 6 meters. With a line spacing of 3 meters, the chances of getting a clear anomaly goes up 8 fold as the 10lb iron sledgehammer would be at a minimum a 8nT anomaly vs a 1nT anomaly. In a geological sense, let's say we have a mafic dike intrusion that we believe is running E-W and it extends at least 25 meters in the near-surface in a somewhat linear fashion. It's difficult to model the amount of iron in a geological structure like this, so the survey should be designed to cross the dike perpendicularly every 5 meters or so, making sure to cross over the dike several times. Each pass over the dike may exhibit an anomaly of similar amplitude, and the feature will show up as a clear linear feature in the final processed map. For general mapping of geology, you have a lot of options. Most commonly Mineral exploration surveys are done over very large areas, so the line spacing is wider to save time as the lower resolution model that results still accomplishes the task of finding large Mineral deposits. If more detail is required, then a more fine-grained survey can be done later. 20m-50m line spacing is typical for Mineral exploration surveys. Design a survey grid to completely encompass the area of interest (i.e. make sure you get some data outside of the areas of interest, in case an interesting anomaly lies right along the edge). The founder of Geometrics the late Sheldon Breiner called this the Law of Search, as he often found his targets of interest along the edges of his archaeological magnetic surveys. It is important to make sure the operator of the magnetometer is magnetically clean before surveying with the magnetometer. This means no steel toe boots, glasses or hats with metal fittings, cellphone, belt buckle, etc. Magnetometer data acquisition is fairly simple, but data interpretation can be complex. You may need a base-station too. Please refer to the Base-Station information.

One of the primary uses of our magnetometers is Mineral exploration. Iron ore is one of the easiest targets because of its magnetic properties. Because of this, magnetometer surveys are almost always part of the initial phase of any iron exploration program. Briefly stated, the exploration strategy is to use portable magnetometers to measure the magnetic field strength over the entire survey area by traversing it along many parallel survey lines with the magnetometer. This field work provides measurements that are used to construct a magnetic anomaly map. Using this map, an economic geologist or geophysicist will infer the probable location of iron concentrations. Based on their assessment, drilling or sampling sites are chosen and, using the chemical assay of the samples, the iron ore reserves are calculated. You or your customer should be working with a geologist or geophysicist who is familiar with the region where the prospect area is located. Conducting a magnetometer survey and making a useful anomaly map are inexpensive activities as compared with survey data interpretation, sampling, and assay work. If your customer wants to learn more about magnetic survey practice, a good way to start is by downloading and reading the free Application Manual for Portable Magnetometers.

That depends on a variety of factors such as the amount of explosives to be used per shot, your desired depth of exploration, etc. The answer is ideally that you drill the shot holes deep enough to avoid blowouts, but no deeper. If you are using explosives we recommend the use of the HVB-1 Blaster. We have HVB-1 Blasters available through our Rental Department as well.

@ahmed_ramadan_geo Hi Ahmed, The remaining noise after compensation is likely from 3 main sources: 1. The intrinsic sensor noise. At 10Hz, 5pT/rt-Hz rms sensor noise is equivalent to about 0.08 nT peak-to-peak noise. 2. Remaining drone noise. Our EM customers use 5m suspension cables, instead of 3m, to further reduce the drone interference. But this depends on your drone. 3. Compensation noise. The compass reading is very noisy. Part of it will enter the data after compensation. If you want to further reduce the noise, you can apply LPF at lower frequencies. For Mineral explorations, I don't think you need 10Hz data. Regarding your other question, the coordinates in the sample file is NOT at the real survey site. We intentionally shifted the coordinates for privacy reasons. MagArrow is based on the scalar sensor technology. Its readings are absolute, not relative.

Your need of a magnetometer base station like the G-862RBS depends on the objective of the survey. If one is performing a geologic survey to investigate deep structure (exploration for Mineral deposits, oil/gas, geology) then the wavelengths of the "target" body are typically “long” (long in meters, therefore long in data acquisition time). The rate at which the Earth's natural magnetic field responds to interaction with the solar wind is also typically many seconds to minutes (diurnal variations). Since the geologic and diurnal variations are of similar wavelengths, a geologic mag survey usually requires a base station. Please read the introductory sections of the Applications Manual for Portable Magnetometers offered on our website for more details. If you are moving fast (fast in the sense of a brisk walk, ~1m/s) and looking for small targets (UXO, archaeological artifacts, environmental targets like drums, pipes, etc.) then you are “up and over” them in a matter of seconds and typically the earth’s field does not change in this time frame. So there is less need for a base station for these type surveys. Of course, it never hurts to have a base station running and if you are surveying over multiple days, having a reference station will allow easier “block leveling” of multiple day surveys.

A bit more about option #4: In Canada many people call this "Varsol" even though that is a brand name rather than the real name of the chemical. The term "odorless" really means that it doesn't smell nearly as much as the other type of Mineral spirits. It still has a smell that is strong enough to be easily noticed.