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Introduction
• This manual is a quick reference source with examples for the
8420-51, 8421-51, 8422-51 MEMORY HiLOGGER for measure-
ment purposes.
For more detailed description of operations, refer to the Instruc-
tion Manual. In particular, before operating the instrument, be
sure to read carefully and understand the Safety Notes and
Chapter 2 "Measurement Preparations" (page 21) in the Instruc-
tion Manual.
• Refer to the Instruction Manual and the Communications/ Wave
Viewer Instruction Manual provided with this instrument.