Agilent Technologies E1439 manual 144

Agilent E1439 Programmer's Reference

Functions listed alphabetically

Comments

To ensure full alias-free operation the analog anti-alias filter should be ON unless the application inherently bandlimits the input signal to less than fs/2. The analog anti-alias filter has a fixed bandwidth and thus is fully effective only when fs ≥ 100 MHz. If a slower external ADC clock is used, an additional analog filter of the appropriate bandwidth may be required for full alias protection.

When using the analog anti-alias filter, you may need to set the range parameter higher than the actual range of the input signal. The reason for this is that step changes of input voltage cause an overshoot and ringing response at the output of the anti-alias filter. The peak overshoot actually exceeds the input voltage step by about 20%. The range setting must accommodate this overshoot to avoid an ADC overflow.

Return Value

AGE1439_SUCCESS indicates that a function was successful.

Values other than AGE1439_SUCCESS indicate an error condition or other important status condition. To determine the error message, pass the return value to “age1439_error_message” on page 102.

See Also

“age1439_init” on page 132, “age1439_input_autozero” on page 134, “age1439_input_range_ auto” on page 137, “age1439_input_range_convert” on page 138, “age1439_data_scale_get” on page 89

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