Performance Testing and Calibration
Front Panel Calibration
4
4-11
Table 4-5. Front Panel Calibration (cont)
Ohms Calibration
Step Initial Meter Cal
Prompt
5700A Source
Output
Edit Meter Cal Prompt
To:
Meter Settling Time
Before Pressing
E
25
26
27
28**
29**
290.00 Ω
2.9000 kΩ
29.000 kΩ
290.00 kΩ
2.9000 MΩ
190 Ω*
1.9 kΩ
19 kΩ
190 kΩ
1.9 MΩ
5700A Display
"
"
"
"
1 s
1 s
2 s
3 s
3 s
Continuity/Hysteresis Threshold Calibration
Step Meter Cal
Prompt
Source Output Meter Settling Time Before Pressing E
30
31
0.000 V
0.020 V
0.000 mV
20.00 mV
1 s
1 s
Frequency Calibration
32 2.000 V p-p 10 kHz 2 s
* A 190 Ω source calibrates the 300 Ω range on the Fluke 45 to 0.06%+2 digits +0.02 Ω. For calibration of
this range to 0.05%+2 digits +0.02 Ω, use a 290 Ω source and the procedure detailed under Alternate
Ohms Calibration (Front Panel). This procedure can also be used with appropriate discrete resistor
values (such as a decade box) on all ranges.
** Note that the 300 kΩ and 3 MΩ ranges are quite sensitive to noise. Any movement of the input leads
or movement of the hands or body in the vicinity of the leads can cause noisy readings. This causes an
error in the calibration if the
E button is pushed during a bad reading. To avoid this, use shielded
leads during this calibration and hold very steady for several seconds with your index finger resting on
the
E button before pressing it. These two cal points should be verified for accuracy at the
conclusion of calibration.
4-11. DC and AC Amps Calibration (Front Panel)
The dc and ac amps calibration requires a boost amplifier or transconductance amplifier
capable of 10 A output at both dc and 1 kHz.
1. If the meter is already in calibration mode, press the
U or T button to select A
DC calibration. Otherwise, select calibration mode first (press Cal Enable button for
three seconds), then select A DC calibration by pressing the
U button four times.
2. Connect the output of the boost amplifier to the [10 A] and COM inputs of the
meter.
3. Apply the dc amp output indicated in Table 4-5 (step 22), and calibrate using the
E button.
4. Select A AC calibration on the meter by pressing the
U button once.
5. Apply the two ac amp outputs called for in steps 23 and 24 of Table 4-5, calibrating
each step by using the
E button.
4-12. Ohms Calibration (Front Panel)
If you do not have the value resistors (290 Ω, 2.9 kΩ, 29 kΩ, etc.) required by the Fluke
45 calibration prompts, the requested value (prompt) must be edited to the value
available. (See "Editing the Prompt for Different Calibration Points", later in this
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