Calibration Security Code
This feature allows you to enter a security code (electronic key) to
prevent accidental or unauthorized calibrations of the multimeter.
When you first receive your multimeter, it is secured. Before you can
adjust calibration constants you must unsecure the meter by entering
the correct security code. See example 1 in chapter 3, “Menu Tutorial,”
starting on page 53.
•
The security code is set to “
HP034401
” when the multimeter is shipped
from the factory. The security code is stored in non-volatile memory,
and does not change when power has been off or after a remote
interface reset.
•
To secure the multimeter from the remote interface, the security code
may contain up to 12 alphanumeric characters as shown below.
The first character must be a letter, but the remaining characters can
be letters or numbers. You do not have to use all 12 characters but
the first character must always be a letter.
A _ _ _ _ _ _ _ _ _ _ _
(12 characters)
•
To secure the multimeter from the remote interface so that it can be
unsecured from the front panel, use the eight-character format shown
below. The first two characters must be “HP” and the remaining
characters must be numbers. Only the last six characters are
recognized from the front panel, but all eight characters are required.
(To unsecure the multimeter from the front panel, omit the “HP” and
enter the remaining numbers as shown on the following pages.)
H P _ _ _ _ _ _
(8 characters)
If you forget your security code, you can disable the security feature by
adding a jumper inside the multimeter, and then entering a new code.
See the procedure on the following page for more information.
4
Chapter 4 Calibration Procedures
Calibration Security Code
73
Summary of Contents for 34401A
Page 1: ...Keysight 34401A 6 Digit Multimeter Service Guide ...
Page 2: ......
Page 17: ...Contents 10 ...
Page 18: ...1 Specifications 1 ...
Page 33: ...26 ...
Page 34: ...2 Quick Start 2 ...
Page 54: ...3 Menu Tutorial 3 ...
Page 65: ...58 ...
Page 66: ...4 Calibration Procedures 4 ...
Page 98: ...5 Theory of Operation 5 ...
Page 115: ...108 ...
Page 116: ...6 Service 6 ...
Page 132: ...7 Replaceable Parts 7 ...
Page 143: ...136 ...
Page 144: ...8 Backdating 8 ...
Page 149: ...9 Schematics 9 ...
