Mainframe Calibration
Mainframe calibration allows the oscilloscope to establish the calibration
factors for each slot independent of the plug-ins. These factors are stored in
the oscilloscope’s nonvolatile RAM. Mainframe calibration is initiated from
the "Utility/Calibrate/Calibrate Mainframe" menu, or from the key on the front
panel of the HP 54717A Calibration Plug-in.
Mainframe calibration should be done on a periodic basis (at least annually),
or if the temperature since the last mainframe calibration has changed more
than
±
5
°
C. The temperature change since the last calibration is shown on
the calibration status screen which is found under the
"Utility/Calibrate/Calibrate Status On" menu. It is the line labeled "Current
Frame Temperature
∆
: _
°
C"
The equipment needed to perform mainframe calibration is:
•
HP 54717A Calibration Plug-in
•
Three BNC cables (1 to 2 ft, two cables must be the same length)
•
20-dB BNC attenuator
•
BNC Tee
When the calibration is initiated, instructions appear on the screen on how to
connect the various pieces of equipment to perform the calibration. Note:
you can use the 20-dB attenuator as a 50-
Ω
terminator.
There is a switch on the back panel of the oscilloscope that allows the
mainframe calibration to be enabled or disabled. The rear panel has a
drawing that shows the function of each switch and which is the protected
position. To prevent access to the mainframe calibration switch, place a
sticker over the access hole to this switch.
See Also
The Service Guide for more details about the mainframe calibration, and the
position of the rear-panel memory protect switches.
Calibration Overview
Mainframe Calibration
5–3
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