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7-3
Calibration Commands
You initiate a module calibration from the Modules tab on the All Calibrations dialog
box or by sending the :CALibrate:MODule:VERTical command as shown in the following
example.
DIM Prompt$[64]
OUTPUT 707;":CALIBRATE:MODULE:VERTICAL LMODULE”
OUTPUT 707;":CALIBRATE:SDONE?”
ENTER 707;Prompt$ <Disconnect everything from left module>
OUTPUT 707;":CALIBRATE:CONTINUE”
OUTPUT 707;":CALIBRATE:SDONE?”
ENTER 707;Prompt$ <Done>
NOTE Let the Module Warm Up First. In order for the calibration to be accurate, the temperature of the module must
reach equilibrium prior to performing the calibration.
NOTE Reinserting the module into the mainframe can affect the electrical connections, which in turn can affect the
calibration accuracy.
NOTE ΔT Value. A positive value for ΔT indicates how many degrees warmer the current module temperature is
compared to the temperature of the module at the time of the last module calibration.
NOTE Once the module calibration procedure is started, all access to the instrument’s front panel is blocked, including
the use of the Local button. Pressing Local during a module calibration will not place the instrument in local
mode. The calibration must either be cancelled or finished before you can regain control to the instrument’s front
panel.
CAUTION The input circuits can be damaged by electrostatic discharge (ESD). Avoid applying static discharges to the front-
panel input connectors. Momentarily short the center and outer conductors of coaxial cables prior to connecting
them to the front-panel inputs. Before touching the front-panel input connectors be sure to first touch the frame
of the instrument. Be sure the instrument is properly earth-grounded to prevent buildup of static charge. Wear a
wrist-strap or heel-strap.
Probe Calibration The probe calibration is initiated from the Probe tab on the “Calibrate/All Calibrations” dialog
or by sending either the :CALibrate:PROBe command or the :CHANnel<N>:PROBe:CALi-
brate command. The probe calibration allows the instrument to identify the offset and the
gain, or loss, of specific probes that are connected to an electrical channel of the instrument.
Those factors are then applied to the calibration of that channel. The instrument calibrates
the vertical scale and offset based on the voltage measured at the tip of the probe or the cable
input.
NOTE For passive or non-identified probes, the instrument adjusts the vertical scale factors only if a probe calibration
is performed.
Typically probes have standard attenuation factors, such as divide by 10, divide by 20, or
divide by 100. If the probe being calibrated has a non-standard attenuation, the instrument
will adjust the vertical scale factors of the input channel to match this attenuation.