Agilent Technologies L4400 Performance Verification Tests, L4451A 4-Channel Isolated DAC Module

L4451A and L4452A Calibration Procedures A

Performance Verification Tests

Use the Performance verification tests to verify the performance of the instruments. The performance verification tests use the instrument’s specifications contained in the L4451A and L4452A Product Data Sheets.

L4451A and L4452A Performance Test Considerations

For optimum performance, all test procedures should comply with the following recommendations:

•Assure that the calibration ambient temperature is stable and between 18 °C and 28 °C. Ideally the calibration should be performed at 23 °C

± 1 °C.

•Assure ambient relative humidity is less than 80%.

•Install the plug- in module and allow a 1 hour warm- up period before verification or adjustment.

•Use shielded twisted pair Teflon® insulated cables to reduce settling and noise errors. Keep the input cables as short as possible.

•Remove all user wiring and connections from the instruments before verification or adjustment.

L4451A 4-Channel Isolated DAC Module

Each isolated DAC output channel can be measured and adjusted using a DMM with voltage and current measurement capability.

There are two ways to adjust the DACs, depending upon the state of calibration security:

•If the instrument is secured for calibration when the adjustment is begun, the adjustments are considered volatile. All adjustments are discarded when power is cycled. This provides an easy means to make immediate temperature- compensated adjustments to the DAC outputs without overwriting stored calibration constants.

When this type of adjustment is made, the calibration count (see page 251) is not advanced.

•If the instrument is unsecured for calibration, the adjustments are written to non- volatile calibration memory. The calibration count (see page 251) is advanced.

L4400 User’s Guide 253