1.3 About this operating manual
Narda NBM-520 5
Symbols and marks used in this document
Terminology
! Important instruction
Indicates an instruction that must be followed to avoid dan-
ger.
✓ Requirement
Indicates a requirement that must be met before the next
instruction can be carried out, e.g.
✓ The instrument is switched off.
Instruction
Indicates a single instruction, e.g.
Switch the instrument on.
1.
2.
3.
Sequence of instructions
Indicates a sequence of instructions that must be carried
out in the order given.
Result
Indicates the result of carrying out an instruction, e.g.
The instrument starts a self test.
Bold type Control element
Indicates a control element on the instrument, e.g.
Press the MODE key
Blue type Cross reference (in PDF document only)
Indicates a cross reference to another part of the docu-
ment. Click on the blue type in the PDF document to jump
directly to the cross reference.
Item Meaning
Battery Rechargeable battery
Dry battery Non-rechargeable battery
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