Service manual

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8508A

Service Manual

3-14

ADC Calibration

ADC (analog to digital converter) calibration aligns the different resolutions available

from the Multimeter’s analog to digital converter, so that there are no significant

differences in readings when changing resolutions with a constant input value. It is

recommended that

ADC CAL is only performed if performance verification indicates

significant resolution differences. If required, it is recommended that ADC calibration is

performed before any other calibrations.

No external equipment or signals are required to perform ADC calibration.

Procedure

1. Ensure that no signals are present on the Multimeter’s inputs. The Multimeter may be

left connected to the calibrator as shown above provided the calibrator output is set to

STANDBY.

2. On the Multimeter, Press

CAL to enter the CALIBRATION menu, and select SPCL.

3. Select

Adc to initiate the calibration operation, which will take approximately 3

minutes to complete.

Calibration is complete when the

Busy legend goes out.

DC Voltage Calibration

XW Warning

The Calibrator can deliver a lethal electric shock.

To avoid electric shock when performing the following

calibration procedures:

• Never touch any lead or terminal unless you are absolutely

certain that no dangerous voltage is present.

• Make sure that signal leads are in a safe condition before you

handle them in any way.

Initial Setup

1. Press the

DCV key, select the 200 mV range.

2. Press the

CONFIG key. Select Filt.

3. In calibration mode the resolution defaults to

RESL7 in the DCV function. It is

recommended that this resolution is used for calibration of all DCV ranges.

4. Reselect

DCV.

5. Confirm that the Multimeter is configured for internal guard (External Guard is

deselected) by checking that the

Ext Grd legend does not appear on the left-hand

display.

6. Ensure that the calibrator output is set to

STANDBY and configured for Internal

Guard (

EXT GRD is deselected).

7. Connect the Calibrator to the Multimeter as shown above.

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