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5700A/5720A Series II

Operators Manual

4-60

Table 4-5. 8840A A/D Calibration Allowable Errors

Step Calibrator Output Allowable Error

A 0.0V DC (short) ± 2 counts

B -0.03V ± 2 counts

C +0.03V ± 2 counts

D -0.660V ± 3 counts

E +0.660V ± 3 counts

F -1.970V ± 4 counts

G +1.970V ± 4 counts

The a/d calibration procedure is an iterative process. Each pass through the procedure

uses the constants stored previously and improves them. Normally, one pass is adequate.

However, if the calibration memory has been erased or replaced, or the a/d converter has

undergone repair, the a/d calibration procedure must be performed twice.

Because the a/d calibration procedure is iterative, the instrument's performance can be

slightly enhanced by going through the procedure more than twice. However, this is not

necessary to meet the 8840A's published specifications.

4-67. Offset and Gain Calibration

The offset and gain calibration procedure calibrates the 8840A's offsets and gains by

applying a high and low input for every range of each function. To save time, the 8840A

uses each input for as many ranges as possible.

A function is calibrated by pressing the corresponding function button. Once a function is

selected, the 8840A automatically steps through each range of that function, prompting

you for the necessary calibrator outputs. (The prompts are shown in Table 4-6.) The

8840A does not automatically select another function after one function has been

completely calibrated; therefore, the functions may be calibrated in any order.

To perform offset and gain calibration, proceed as follows:

Ensure that a/d calibration has been completed.

Verify the the calibrator is in standby and connected to the 8840A as shown in Figure

4-13A.

Select the 8840A VDC function by pressing the VDC function button. The 8840A

displays the first prompt for that function.

Each time the 8840A prompts you for a calibrator output, apply this output 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 reference

source while the display is blank.) The 8840A then displays the next prompt. For

reference, all prompts are shown in Table 4-6.

Fluke 5700A Series II User Manual

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