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L4451A and L4452A Calibration Procedures A
L4400 User’s Guide 253
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.