3
Adjustment Procedures
36
Keysight 3458A Calibration Manual
Introduction
This section contains procedures for adjusting the 3458A multimeter. The 3458A
uses closed-box electronic adjustment. No potentiometers or other
electro-mechanical adjustments are used and the complete adjustment is done
without removing any of the multimeter's covers. Only a voltage standard. A
resistance standard, a low-thermal short, and an AC signal source are needed to
perform all of the adjustments. This chapter contains the following adjustment
procedures.
1
Front Terminal Offset Adjustment
2
Rear Terminal Offset Adjustment
3
DC Gain Adjustment
4
Resistance and DC Current Adjustment
5
AC Adjustment
You must perform the adjustments in the order presented in this chapter. All of
the adjustments can be performed in approximately one hour (you must allow 4
hours of warm-up time from the time power is applied to the multimeter before
performing any adjustments). Whenever adjusting the multimeter, always
perform the adjustments numbered 1 through 4 in the above list. Adjustment
number 5 (AC Adjustment) is required only once every 2 years or whenever the
03458-60502 or 03458-66503 PC assembly has been replaced or repaired.
Product Note 3458A-3 in
discusses the purpose of each adjustment
in detail.
An Adjustment Record is located at the back of this chapter. You should make
photocopies of this record and complete the record whenever the multimeter is
adjusted. The record contains information such as the date, which adjustments
were performed, the calibration number, and the multimeter's adjustment
temperature. You can then file the adjustment records to maintain a complete
adjustment history for the multimeter.
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