42 1000 X-Series Oscilloscopes Service Guide3 Calibrating and AdjustingUser CalibrationPerform user-calibration:• Every five years or after 10000 hours of operation.• If the ambient temperature is >10° C from the calibration temperature.• If you want to maximize the measurement accuracy.The amount of use, environmental conditions, and experience with otherinstruments help determine if you need shorter User Cal intervals.User Cal performs an internal self-alignment routine to optimize the signal path inthe oscilloscope. The routine uses internally generated signals to optimize circuitsthat affect channel sensitivity, offset, and trigger parameters. Disconnect allinputs and allow the oscilloscope to warm up before performing this procedure.Performing User Cal will invalidate your Certificate of Calibration. If NIST (NationalInstitute of Standards and Technology) traceability is required perform theprocedures in Chapter 2 in this book using traceable sources.To perform User Cal1 Disconnect all inputs from the front panel and allow the oscilloscope to warmup before performing this procedure.2 Make sure user calibration protection is not on by pressing the [Utility] > Options> Auxiliary; then, press the Cal Protect softkey to disable calibration protection.3 Press the [Utility] key; then, press the Service softkey.4 Begin the User Cal by pressing the Start User Cal softkey.User Cal StatusPressing the User Cal Status softkey displays the following summary results of theprevious User Cal, and the status of probe calibrations for probes that can becalibrated. Note that AutoProbes do not need to be calibrated, but InfiniiMaxprobes can be calibrated.Results:User Cal date:Change in temperature since last User Cal:Failure:Comments:Probe Cal Status: