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                                                                               H



Impedance Measurements of Magnetic Heads
using Constant Current in Production and
Quality Control Departments
Application Note 369-3
                                                                                HP 4284A Precision LCR Meter


Introduction                                                 2. GO/NO-GO Testing of Several Frequency Points

Measuring the impedance of a magnetic head is a              The List Sweep function3 allows sweeping of any of
valuable technique for checking its quality. This type       10 frequencies. Since it is possible to limit the
of measurement involves the following difficulties           measurement value per frequency, GO/NO-GO
and demands.                                                 testing of constant current measurements can easily
                                                             be performed at several frequencies.
 It must be possible to conduct constant current
 measurements at a number of frequency points,               3. A Memory Card Allows for Easy Setups
 not only in the development department, but also
 in the production and quality control departments           A maximum of ten instrument settings for
 as well. It should also be easy to change from one          measurement conditions can be recorded on a single
 set of measurement conditions to another when               memory card. By preparing measurement conditions
 testing different devices.                                  for different samples it is easy to go from one type of
                                                             measurement to another without making mistakes.
 The additional errors caused by test fixtures,
 measurement cables, and the like prevent reliable           4. A Powerful Error Compensation Function
 measurements. These types of errors must be                    Reduces the Additional Errors Caused by
 minimized.                                                     Test Fixtures, and Measurement Cables

 Discrepancies between measurement values of                 This function minimizes the influence of test fixtures
 different channels when a scanner is used must be           on the test results.
 able to be compensated for.
                                                             5. Multi-Channel Compensation Minimizes
Conventional instruments cannot meet these demands.             Discrepancies Between Scanner Channels

Solutions Offered by the HP 4284A                            The use of a scanner interface4 compensates for
                                                             channel discrepancies for up to a maximum of 128
1. Easy Constant Current Measurements                        channels. This function prevents discrepancies in
                                                             measurement values between different channels,
The ALC1 function allows easy constant current               and ensures stable measurements.
measurements within a range of 100 

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