AMH-25 Hysteresisgraph
For evaluating hard and soft magnetic material
The AMH-25 Automatic Magnetic Hysteresisgraph
is a precision personal computer controlled system designed for measuring the DC and AC magnetic properties of a broad range of soft, i.e., non-permanent magnetic materials in either toroid or strip form (with optional strip test fixture) with an electromagnet option can be used to measure permanent magnet materials. With a system accuracy of better than 1% and a color display monitor to enhance the data presentation, the AMH-25 provides both research and production with fast, reliable and comprehensive test results.
The AMH-25 system is suitable for testing
samples in a configuration that allows the magnetizing field strength to be derived from the magnetizing current. This includes test methods applicable to closed magnetic circuits of uniform sections such as ring core tests, 25
cm Epstein frame tests, stacked lamination tests and solenoid tests on samples for which
self demagnetizing effects can be controlled or evaluated.
The AMH-25 system consists of two major components. The first is the system computer with color monitor, keyboard and mouse. The
second is the instrumentation and data acquisition unit that includes an integrating fluxmeter, function generator, power amplifier, and sample connection terminals. The AMH-25 system is completely menu-driven using a
Windows NT or XP operating system. No programming skills are required for setup and operation. Once test parameters have been entered, the operator can automatically evaluate samples at production rates.
The AMH-25 features both manual and automatic control of the system components. The manual mode provides direct control of the fluxmeter, function generator and amplifier.
Real time display of readings, numeric and graphic, allows the operator to easily manipulate or calibrate the system. Attaching an external laser printer or any
MS-Windows compatible output device can produce Hardcopy results. Data may also be "uploaded" or networked to another computer for further analysis.
The AMH-25 can be used with various power amplifiers that allow sample testing at a wide bandwidth at frequencies from 0.01 Hz to 50 kHz. Hysteresis loop parameters, with
curves, are displayed on a high-resolution color monitor. Laser printers can easily be attached to allow printing of both the test data and hysteresis (BH) curve. The test data
may also be saved to the computer hard disk for later analysis.
To measure permanent magnet materials standard electromagnet options include the following models:
Model Pole Diameter: inches (mm) 4” (101) 7” (178) 10” (254) Maximum Field: 15 kOe 20 kOe 25 kOe Air Gap 0 to 3.25" 0 to 4.25" 0 to 5.5" Shipping Weight 425 lbs 1200 lbs 3000 lbs
1 inch (25 mm) air gap
The high precision and ease of operation of the AMH-25 make it a suitable tool for both
the research and production environments. Applications include the analyzing the magnetic properties of permanent magnet materials, soft ferrites, amorphous cores and
electrical steels and evaluating the effects of heat treatment.
The following magnetic values are reported on the AMH-25: Remanence (Br), Coercivity (Hc), Maximum Induction (Bmax), Maximum Magnetizing Force (Hmax), Hysteresis Loss
(Wh), Initial Permeability (µinit) Maximum Permeability (µmax), Permeability at Selected "H" (µH), Permeability at Selected "B" (µB), Frequency (f).
Features of the AMH-25 include:
- DC and AC tests to 50kHz
- Keyboard Selectable SI or CGS units
- Automatic fluxmeter drift compensation
- Automatic sample demagnetization
- 64k buffer memory for fast sample testing
- Windows NT or XP operating system and software
- Internal hard drive capable of storing results from thousands of tests
- Programmable pass/fail limits for quality control applications
- Plot initial induction curve with four quadrant curve and list of data values
- User password protection
- System accuracy better than 1.0%
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(800) 962-4638
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