MFK2
THREE FREQUENCY KAPPABRIDGES FOR MEASUREMENTS
OF MAGNETIC SUSCEPTIBILITY
- ANISOTROPY
- FREQUENCY VARIATIONS
- FIELD VARIATIONS
- TEMPERATURE VARIATIONS
General description
MFK2 series of Kappabridges are the updated versions of the advanced Multifunction Kappabridges MFK1. These are the world's most sensitive commercially available laboratory instruments for measuring anisotropy of magnetic susceptibility (AMS) and bulk magnetic susceptibility in weak variable magnetic fields (field range from 2 A/m to 700 A/m, peak values). Besides the in-phase bulk susceptibility, relative changes of the phase angle can be measured. The MFK2-FA and MFK2-FB models are capable to measure, besides at the basic frequency of 976 Hz, also at two additional frequencies of 3904 Hz and 15616 Hz.
Updated electronic circuits, redesigned measuring coils and enhanced firmware and software bring better reproducibility of the results, improved mesurements of the field and frequency variations of magnetic susceptibility and refinement of the relative changes of the out-of-phase component of magnetic susceptibility measurements.
Spinning specimen method uses 3D rotator or classic rotator for easy, rapid and precise AMS measurements. Automatic routines for investigation field variations of AMS as well as bulk susceptibility are incorporated for better user comfort. Optional attachment CS4 and CS-L enables measurements of temperature variation of bulk susceptibility from -192°C up to 700°C.
Versions
MFK2-FA
Three frequency Kappabridge fully equipped with special Up/Down mechanism and rotator for spinning specimen method of AMS measurements. Automatic measurements of field variations of bulk susceptibility. Full support of CS4 and CS-L apparatuses is present as well.
MFK2-FB
Basic version of three frequency Kappabridge for manual measurements of AMS, bulk susceptibility and field variations of magnetic susceptibility without Up/Down mechanism, rotator and CS4 or CS-L support. To faciliate AMS measurements magnetic susceptibility must be manually measured in 15 different orientations. Can be upgraded to MFK2-FA version, but such upgrade has to be done in AGICO facility.
Software
Data acquisition software Safyr controls all particular functions of the Kappabridges, calculate results of individual measurements as well as advanced statistics on measured data. Standard visualisation of the results is also incorporated. For more in-depth analysis of AMS AGICO provides Anisoft - advanced software for processing of AMS datasets.
Main features
| ■ | High sensitivity 2 x 10-8 (SI) |
| ■ | Fully automatic zeroing system |
| ■ | Three operating frequencies |
| ■ | Field variations of magnetic susceptibility |
| ■ | Rapid AMS measuring (MFK2-FA) |
| ■ | Autoranging |
| ■ | Built-in circuitry for controlling optional CS4 Furnace and CS-L Cryostat |
| ■ | Advanced diagnostics |
| ■ | Sophisticated software support |
| ■ | Optionally 3D rotator (MFK2-FA) |
Technical specifications
| Operating frequencies | 976 Hz |
| 3904 Hz | |
| 15616 Hz | |
| Field intensity ranges | |
| Frequency 976 Hz | 2 - 700 A/m (peak) |
| Frequency 3904 Hz | 2 - 350 A/m (peak) |
| Frequency 15616 Hz | 2 - 200 A/m (peak) |
| Sensitivity | |
| 976 Hz, 400 A/m peak | 2 x 10-8 SI (400 A/m) |
| 3904 Hz, 200 A/m peak | 6 x 10-8 SI (200 A/m) |
| 15616 Hz, 200 A/m peak | 12 x 10-8SI (200 A/m) |
| Field homogeneity at 976 Hz | 0.5 % |
| Measuring range | up to 0.5 (SI) at 976 Hz |
| Accuracy within one range | ±0.1 % |
| Accuracy of absolute calibration | ±3 % |
| Pick-up coil inner diameter | 43 mm |
| Power requirements | 100, 120, 230, 240 V, 50/60 Hz, 40 VA |
Specimens to be measured
| For spinning method | |
| Cylinder (regularly shaped specimens) | |
| Diameter | 25.4 ± 1 mm |
| Length | 22.0 ± 1 mm |
| Cube | 20x20x20 mm |
| For static method as for spinning method plus | |
| Cube | 23x23x23 mm |
| ODP type | 26x25x19.5 mm |
| Fragments | up to 40 cm3 for bulk susceptibility |
Kappabridges versions comparison
Kappabrige comparison in more detail can be found here.
| MFK2-FA | MFK2-FB | KLY5-A | KLY5-B | |
| Bulk susceptibility | ✔ | ✔ | ✔ | ✔ |
| Anisotropy of magnetic susceptibility | ✔ automatic |
✔ manual |
✔ automatic |
✔ manual |
| Field variations of bulk susceptibility | ✔ automatic |
✔ manual |
✔ automatic |
✔ manual |
| Field variations of anisotropy of susceptibility | ✔ automatic with 3D Rotator |
✔ manual |
✔ automatic with 3D Rotator |
✔ manual |
| Frequency variations of bulk susceptibility | ✔ | ✔ | ✖ | ✖ |
| Frequency variations of anisotropy of susceptibility | ✔ semi-automatic |
✔ manual |
✖ | ✖ |
| High-temperature variations of bulk susceptibility | ✔ in combination with CS4 |
✖ | ✔ in combination with CS4 |
✖ |
| Low-temperature variations of bulk susceptibility | ✔ in combination with CS4 and CS-L |
✖ | ✔ in combination with CS4 and CS-L |
✖ |
| Absolute out-of phase susceptibility | ✖ | ✖ | ✔ | ✔ |
| Relative changes out-of phase susceptibility | ✔ lower precision |
✔ lower precision |
✔ higher precision |
✔ higher precision |