AMH-15

AMH-15 Hysteresisgraph

For evaluating hard and/or soft magnetic material

The AMH-15 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. The AMH 15 is limited to a frequency range of DC to 1-kHz. With a system accuracy of better than 1% and a color display monitor to enhance the data presentation, the AMH-15 provides both research and production with fast, reliable and comprehensive test results.

The AMH-15 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, 15 cm Epstein frame tests, stacked lamination tests and solenoid tests on samples for which self demagnetizing effects can be controlled or evaluated.

The AMH-15 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-15 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-15 can be used with various power amplifiers that allow sample testing at a wide bandwidth at frequencies from 0.01-Hz to 1-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

HV-4V

HV-7V

HV-10V

Pole Diameter: inches (mm)

4” (101)

7” (178)

10” (254)

Maximum Field:
1 inch (25 mm) air gap

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

The high precision and ease of operation of the AMH-15 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-15: Remanence (B_r), Coercivity (H_c), Maximum Induction (B_max), Maximum Magnetizing Force (H_max), Hysteresis Loss (W_h), Initial Permeability (µ_init) Maximum Permeability (µ_max), Permeability at Selected "H" (µ_H), Permeability at Selected "B" (µ_B), Frequency (f).

Features of the AMH-15 include:

DC and AC tests to 1-kHz
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%

AMH System Specifications

How to Choose the Correct Hysteresisgraph

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