Tektronix IsoVu TIVM Series User Manual page 31

Programming
TIVM Series Measurement System User Manual
When you power on the measurement system, the SELF CAL status indicator on
the controller is orange, indicating that the operating point of the measurement
system has not been optimized. As a result, the accuracy of the measurement
system might be degraded. The SELF CAL sequence should always be run
on the system after it is first powered on and has warmed up for 20 minutes.
After pushing the SELF CAL button, the indicator blinks orange during the self
calibration process; it turns solid green when the operation completes or solid
red when the operation fails.
There are situations when further self calibration is required. The SELF CAL
status indicator turns orange to indicate when this is necessary:
The measurement system is first attached to the oscilloscope.
Changes are made to the range (1X|2X) or clamp (ON|OFF) setting.
The temperature in the sensor head changes more than 10 °C.
The internal compensation adjustments have shifted outside their normal
operating ranges.
The sensor tip cable is changed.
Users wanting to initiate the self calibration through the programmatic interface
must configure the measurement system to perform a self calibration every time
it receives the AutoZero command. To link these functions, hold the MENU
button down and momentarily press the SELF CAL button. The OVER RANGE
indicator should blink red twice. This mode is non-volatile, and it also changes
the operation of the AutoZero button in the Probe Setup menu of the oscilloscope.
Restore the original operation by repeating the MENU-SELF CAL button pushes.
In this case the OVER RANGE indicator will blink once.
Operating information
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