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Perform Self-Calibration
When performing self-calibration, no signal is injected into the handheld scope.
During the self-calibration process, the firmware will perform zero, offset, and
TDC calibration.
– For zero calibration, the firmware will acquire samples for a fixed period of time
– Offset calibration (performed after completion of the zero calibration)
– TDC calibration calibrates and corrects for errors (due to temperature
Allow the handheld scope to warm up for at least 30 minutes before performing
self-calibration. It is recommended that you perform self-calibration in the
following situations:
– Every 12 months or after 2000 hours of operation.
– If the ambient temperature is >10 °C from the calibration temperature.
– To maximize the measurement accuracy.
– After experiencing abnormal operation.
– To verify proper operation after repairing.
Disconnect all probe and meter connections to the input terminals of the
WARNING
handheld scope before performing self-calibration.
Keysight U1610/20A User's Guide
corresponding to the zero input condition. The acquired data contains channel
noise and DC offset. The firmware determines this channel DC offset and upon
completion of self-calibration, uses the determined DC offset to subtract from
ADC samples, producing offset-compensated samples. This feature is useful
for removing channel DC offset due to temperature changes and component
aging, thus providing better accuracy.
calibrates the system offset DAC for gain accuracy. During calibration, the
firmware determines the offset DAC code settings required to offset the zero
input signal trace to +4 divisions and –4 divisions (vertical). The codeword
range for the offset DAC to move the zero input trace across ±4 division range
will represent the offset DAC gain. This gain changes due to temperature
variation and component aging. Offset calibration corrects for this drift in the
offset DAC gain.
variation) in the time interval measurement performed by the TDC circuit.
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