Fluke 123 - Dual Input Meter; DC Voltage (VDC); True RMS Voltages (VAC and VAC+DC); Frequency (Hz)

Calibration Adjustment
4.1 General 4
4-3
4.1 General
4.1.1 Introduction
The following information, provides the complete Calibration Adjustment procedure for
the test tools Fluke 123 and 124 with firmware V02.00 and onwards and for Fluke 125.
The test tool allows closed-case calibration using known reference sources. It measures
the reference signals, calculates the correction factors, and stores the correction factors in
RAM. After completing the calibration, the correction factors can be stored in
FlashROM.
The test tool should be calibrated after repair, or if it fails the performance test. The test
tool has a normal calibration cycle of one year. The Calibration Adjustment procedure is
identical for Fluke 123, 124 and 125.
4.1.2 Calibration number and date
When storing valid calibration data in FlashROM after performing the calibration
adjustment procedure, the calibration date is set to the actual test tool date, and
calibration number is raised by one. To display the calibration date and - number:
1. Press
to open the USER OPTIONS menu.
2. Press
to show the VERSION&CALIBRATION screen (see Figure 4.1).
3. Press
to return to normal mode.
VERSION.BMP
Figure 4-1. Version & Calibration Screen
4.1.3 General Instructions
Follow these general instructions for all
calibration steps:
• Allow the 5500A to satisfy its specified warm-up period. For each calibration point ,
wait for the 5500A to settle.
• The required warm up period for the test tool is included in the WarmingUp &
PreCal calibration step.
• Ensure that the test tool battery is charged sufficiently.