MGM, DC Milligaussmeter for Weak Magnetic DC fields up to 2000mG
The Model MGM measures weak DC magnetic fields. This is a 1-axis instrument.
- High dynamic range and sensitivity: reads up to 1999.99 milligauss with .01 milligauss resolution including polarity.
- Turns on instantly, updates three times a second, no setup or initial calibration required.
- 0.5% accuracy at room temperature.
- Flexible probe, battery and AC power supply included.
- Optional rubber boot and hard carrying case are available.
- CE compliant.
An improvement on the flux gate magnetometer, the DC Milligauss Meter measures magnetic fields (technically "flux density") up to several times the strength of the Earth field. It has a resolution of 0.01 milligauss (1 nanotesla) and a range of ±2000 milligauss (200 microteslas). The meter's magnetoresistive sensor is a major improvement over an uncompensated fluxgate magnetometer both in cost and stability. In fact, this sensor approaches a proton precession magnetometer in temperature stability. However, at only 1 mm x 0.2 mm, the active sensor area is much smaller than fluxgate magnetometer or proton sensors. This allows very precise magnetic measurements in small areas (such as thin films) or with high gradients, when necessary.
The display is 5 1/2 digits, which reads from -1999.99 to +1999.99 milligauss, with a resolution of 0.01 milligauss over the entire range. (Compared to the Earth field, which is on the order of 500 milligauss). Update is three times per second.
This wide dynamic range of the display (199,999 counts; both polarities), and high stability of the meter allow for stable detection of small changes in a large background field.
The sensor is at the end of an eight-wire cable that is normally four feet long, but other custom lengths are available. The sensor is "axial", which means it detects the component of the field that's in the same direction as the cable points (see arrow photo). The meter reads negative when the sensor is pointing towards the south pole of a magnet and positive towards north. The small active area of the sensor is in the center of the dark square.
Measurement parameter: DC magnetic flux density
Measuring range: 1,999.99 mG (200 microteslas) with polarity indicator
Resolution: 0.01 mG (1 nanotesla)
Frequency range: DC to 3Hz (DC to 300Hz upon request)
Accuracy: ±0.5% of reading (0 to 45°C)
Housing dimensions: ca. 180mm x 90mm x 50mm
Weight: 325 g
Battery: 9V alkaline, "Low Battery" indicator
- Analog output jack (mono headphone plug): 1mV/mG
- Analog BNC output jack: 1mV/mG
- Detachable rubber boot
- Hard carrying case