Section 2. Adjustments; Introduction; Safety Considerations - Agilent Technologies 4284A Service Manual

2-1. INTRODUCTION

This section describes the adjustments required to ensure that the HP 4284A Precision LCR
Meter is within its published specifications after it has been repaired. These adjustments
should be performed along with periodic maintenance to keep the HP 4284A in optimum
operating condition. T h e recommended calibration cycle is six months. I f proper perfor-
mance cannot be achieved after calibration refer to the troubleshooting procedures in this
service manual.
To ensure proper results and correct instrument operation, Hewlett-Packard sug-
gests a 30-minute warm-up and stabilization period before performing any of the
following adjustments.

2-2. SAFETY CONSIDERATIONS

This manual contains NOTEs, CAUTIONs, and WARNINGs which must be followed to ensure
the safety of the operator and to keep the instrument in a safe and serviceable condition.
The adjustments covered in this section must be performed by qualified service personnel.
ANY INTERRUPTION OF THE PROTECTIVE GROUND CONDUCTOR (INSIDE OR
OUTSIDE T H E INSTRUMENT) O R DISCONNECTION O F T H E PROTECTIVE
GROUND TERMINAL CAN MAKE THE INSTRUMENT DANGEROUS. INTENTION-
AL INTERRUPTION OF THE PROTECTIVE GROUND SYSTEM FOR ANY REASON
IS PROHIBITED.
The removal or opening of covers for adjustment, or removal of parts other than those which
are accessible by hand will expose circuits containing dangerous voltage levels.
Remember that even though you have turned the HP 4284A off, and unplugged it, the ca-
pacitors in the HP 4284A can remained charged for several minutes.
SECTION 2
ADJUSTMENTS
NOTE
WARNING'
2-1
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