Performance Testing and Calibration
4
4-7
Table 4-3. Performance Tests for mA Current Functions
Function Range (Rate) Input Level Frequency Display
Min Max
C (mA) 30 mA
100 mA
+30 mA
+100 mA
-
-
29.982
99.93
30.018
100.07
D (mA) 30 mA
100 mA
30 mA
100 mA
1 kHz
1 kHz
29.840
99.40
30.160
100.60
Table 4-4. Performance Tests for Current Functions
Function Range (Rate) Input Level Frequency Display
Min Max
C 10 A +10 A - 9.975 10.025
D 10 A 10 A 1 kHz 9.890 10.110
4-4. Front Panel Calibration
The Fluke 45 features closed-case calibration using known reference sources. The
multimeter automatically prompts you for the required reference sources, measures
them, calculates correction factors, and stores the correction factors in the nonvolatile
calibration memory.
Closed-case calibration has many advantages. There are no parts to disassemble, no
mechanical adjustments to make, and the Fluke 45 can be calibrated by an automated
instrumentation system.
The Fluke 45 should normally be calibrated on a regular cycle, typically every 180 days
or 1 year. The chosen calibration cycle depends on the accuracy specification you wish
to maintain. The Fluke 45 should also be calibrated if it fails the performance test or has
undergone repair. To meet the specifications in Chapter 1, the Fluke 45 should be
calibrated with equipment meeting the minimum specifications given in Table 4-1.
The following paragraphs first present a basic calibration procedure for use with front
panel control. This is followed by a description of editing prompts for different
calibration points, then by a description of calibration using the IEEE-488 or RS-232
computer interface.
4-5. Introduction
The basic calibration consists of sets of steps for DC Volts, AC Volts, DC and AC
Milliamps, DC and AC Amps, Ohms, Continuity/Hysteresis Threshold, and Frequency.
Normally, it is recommended that the entire calibration procedure be performed.
However, it is possible to calibrate any function individually. This might be useful
during troubleshooting, when looking for a problem in a specific function. Whenever the
VDC function is calibrated, the entire calibration procedure for all functions should be
performed. Any function except VDC can be calibrated independently without affecting
calibration of another function.
If calibration of any function is discontinued prior to completion, no changes are made to
nonvolatile calibration memory for that function.
Some calibration steps take longer to execute than others. When the Fluke 45 is
executing a calibration step, it ignores all of the front panel buttons and postpones
execution of all computer interface commands.
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