Calibration; Introduction; Safety Requirements; Calibration Interval - HP 16532A Service Manual

4-1. Introduction

This section provides information on calibrating
the HP 16532A 1 GSa/s Oscilloscope module.
Information is included about when to calibrate the
module, the module warm up interval required
prior to calibration, and how to do the actual
calibration of the module. Also included are safety
requirements to observe when working on the
equipment, a list of recommended test equipment,
and equipment setups for the different calibration
procedures. Although the module has no
hardware adjustments, it does contain a
calibration PROTECT/UNPROTECT switch that
you use before and after calibration. Actual
calibration of the module is performed in software.

4-2. Safety Requirements

Read the safety summary at the front of this
manual before any replacement, maintenance, or
repair is performed.
Specific warnings, cautions, and instructions are
placed wherever applicable throughout the
manual. These must be observed during all
phases of operation, service, and repair of the
module. Failure to comply with them violates
safety standards of design, manufacture, and
intended use of this module. Hewlett-Packard
assumes no liability for the failure of the customer
to comply with these safety requirements.

4-3. Calibration Interval

To maintain proper calibration, perform calibration
at approximately six-month intervals, or every 1000
hours, when the instrument is being used under
normal operating conditions. Immediate
calibration is required if one of the following
occurs:
•
Oscilloscope module is installed, repaired, or
replaced, or if the card slot configuration is
changed.
•
The oscilloscope software changes revision
number and asterisks (* ) are on the calibra-
tion menu.
•
Ambient temperature changes more than
10 °C.
If you add or delete a card(s) from a calibrated
multicard oscilloscope module, you must perform
the Time Null calibration.

4-4. Maintaining System Integrity

Calibration factors depend on the mainframe,
module, and module configuration all staying
together. If oscilloscope modules are
interchanged between mainframes, or the
oscilloscope module slot configuration is changed,
calibration must be repeated. In an environment in
which the possibility of sharing oscilloscope
modules exists, Hewlett-Packard recommends
taking the following precautions in order to
maintain system integrity:
With the system turned off, place the
PROTECT/UNPROTECT switch (all switches in a
single or a chained, multiple oscilloscope module
configuration) in the UNPROTECT position.
Boot the system and perform calibration for each
module.
Turn off the system, place the
PROTECT/UNPROTECT switch (all switches in a
single or a chained, multiple oscilloscope module
configuration) in the PROTECT position, then seal
the mainframe.

4-5. Calibration Protection Switch

Each HP 16532A board stores the calibration
factors for that board in non-volatile RAM on the
board itself. The HP 16532A board contains a
calibration protection (PROTECT/UNPROTECT)
switch. With the switch in the PROTECT position,
calibration values cannot be changed.
HP 16532A - Calibration
SECTION IV

Calibration

4-1