User`s manual

7800 Series Hysteresisgraph System User's Manual
Operation 4-1
CHAPTER 4
OPERATION
4.0 GENERAL
This chapter describes the operation of the 7800 Series Hysteresisgraph System Software. A description of the
software screens is provided in Paragraph 4.1. Calibration is detailed in Paragraph 4.2. Finally, a suggested
sequence of operation is provided in Paragraph 4.3.
4.1 SOFTWARE DESCRIPTION
The Windows NT/2000-based Hysteresisgraph software provides instant feedback, software prompts to guide the
operator, and highly fault-tolerant operation. An advanced closed-loop feedback control system controls the power
supply current and the applied field in the electromagnet gap. By mapping applied field, current, gap, and pole
face geometry and composition data, the control algorithm accommodates non-ideal electromagnet characteristics.
Real-time field-dependent response tracks B flux changes for accurate curve shape definition and parameter
extraction. A pattern recognition algorithm enhances second quadrant loop shape definition for high accuracy in
extracted data results.
Three operating modes accommodate a full range of application needs. Manual control mode provides data
analysis while the user manually controls applied H field. Full automation provides the highest repeatability with
the least number of operator tasks. Automatic probe identification, automatic drift nulling, adaptive software, and
advanced feedback control simplify and streamline the measurement process. Semi-automatic control mode allows
users to automate custom experiments. Programs of up to 20 steps can be defined. Field sweeps to a particular H,
B, or target B-H value can be specified. Rates of H field change can be programmed, or advanced feedback
control can be selected. Custom program capability helps to ensure that the 7800 Series will not become outdated.
Other features include extensive QC data analysis, criteria testing capability, and operator and password-protected
supervisor operating modes. In password-protected supervisor mode, upper and lower tolerance limits can be
defined for each test parameter. In operator mode, nonconforming data is automatically flagged, with percent
deviation calculated in real time. Error flagging and comprehensive QC data analysis simplify the QC process to
aid in statistical process control.
Basic Sample
Information
CGS Results
QC Non-
Conformance
Flags
SI Results
Permeance
Data
SI Axes
Intrinsic Induction
Remanence
Normal Induction
Max. Energy
Product
Permeance
Intrinsic Coercivity
Normal Coercivity
CGS Axes
Main Screen.eps
Figure 4-1. Main Screen Definition