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Front Panel Operation

Sample Applications 4

4-59

4-66. A/D Calibration

The a/d calibration procedure calibrates the analog-to-digital converter for offset, gain,

and linearity. The 8840A automatically selects the a/d calibration procedure when the

CAL ENABLE switch is first pressed. The procedure must be performed in its entirety,

and may not be performed in part. If the a/d calibration is discontinued prior to

completion, the last complete set of a/d calibration constants will be retained unchanged.

To perform a/d calibration, proceed as follows:

The 8840A displays a prompt for the first reference source, 0V dc (i.e., a short).

Each time the 8840A prompts you for a reference source, set the calibrator to the

requested value, and press the 8840A STORE button. When you press STORE, the

numeric display field blanks while the 8840A performs the necessary calculations.

(Do not change the calibrator’s output while the display is blank.) The 8840A then

displays the next prompt. For reference, all prompts are shown in Table 4-4.

Note

The 8840A automatically checks that the reference input is near the value

prompted and displays ERROR 41 if the reference input exceeds a specific

tolerance. (See Advanced Features and Special Considerations in the

8840A Instruction Manual for more information.)

3. After the last input is stored, the 8840A begins taking readings in the 2V range of the

VDC function. (The 8840A CAL annunciator remains on.) Verify a/d calibration

using settings in Table 4-5. If you wish to repeat the a/d calibration procedure, press

the 8840A A/D button.

Table 4-4. 8840A A/D Converter Calibration Prompts

Step 8840A Prompt

A O.OV DC (short)

B -0.03V DC

C -1.01V DC

D +0.99V DC

E +0.51V DC

F -0.51V DC

G -0.26V DC

H +0.26V DC

I +0.135V DC

J -0.135V DC

K -0.0725V DC

L +0.0725V DC

Fluke 5700A Series II User Manual

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