Geonics EM31 troubleshooting almost always starts with checking the batteries. Turn on the EM31 and set the knob to BATT to read the voltage. If the needle reads between the battery marks of an analog display or between +/- 4.4V on a digital display, then the batteries should not be an issue. Note, the plus and minus values should be …
Will the EM61 detect both ferrous and nonferrous metals? Yes! The EM61 does, in fact, respond to both ferrous and non-ferrous metals! Let’s first quickly review how the EM61 detection occurs. The EM61’s transmitter coil carries a current that creates a strong primary magnetic field that has the potential to intercept a metal target. Once the transmitter current is stopped, the …
Why won’t my EM61 files open on the DAT61MK2 program? EM61 files are stored in the data logger as a different file type than the DAT61MK2 program can open. If the files that you are trying open have the .R61 extension, they will need to be converted to .M61 extension to open in the DAT61MK2 program. Assuming the DAT61MK2 program is …
Compare Geonics EM31 and EM38 Both measure apparent conductivity per meter as well as the inphase ratio of secondary to primary magnetic field in parts per thousand. Their measurement resolution is +/-0.1% of full scale, making their ability to discern targets about the same. Their components and operating controls look fairly similar. Essentially, the EM31 and EM38 work on the same principles and …
A little variation in the EM61 response may not be problem if looking for large response targets. However, when looking for smaller targets, baseline measurements must have as little variation as possible. So why are your EM61 readings varying more than+/-1.5 mV? Good question! I don’t know. That’s for you to discover. Variances as small as +/- 1.5 mV can happen …
Why won’t my EM-31 files open on the DAT31 program? Well, I promise, it’s not because they don’t like you. However, EM-31 data logger files (.R31) are a different flavor than the DAT31 program likes. So, they have to be converted to DAT31 program files with the .G31 file extension. To open EM-31 files collected on the EM-31-MK2 in the …
There are four different kinds of EM-61 Noise. Determining the source of noise is important because a target response can only be established when the response is greater than the background noise. Instrument EM-61 Noise The EM-61 was made by design to have little instrument noise. However, the instrument itself is not noise free. A well calibrated and maintained EM-61 …
How deep can Geonics equipment explore? That depends on what piece of equipment the user is using. The maximum exploration depth of Geonics equipment that measures ground conductivity and magnetic susceptibility, such as the EM-31, EM-38, and EM-34, is dependent on the selected intercoil spacing and orientation of the coils. In other words, the distance between the transmitter and receiver …
Convert to UTM Geonics’ EM-38 Continuous Readings With GPS configured to output NMEA String $GPGGA. Recording continuous apparent conductivity data with a Geonics EM-38 and converting the GPS to UTM is fairly straight forward. 1) Start EM38Mk2 on the datalogger (Allegro CX or TK6000 are often used). Turn on the data logger and find EM38. It is often located on …