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Interface
Perform the action requested by the first part of the string and then send CAL MEAS. If the
second part of the prompt is of the form
": Min n.nnn Max m.mmm”
make the requested measurement and enter the value (which will be a voltage measurement); if
the measurement is not in the specified range, something is wrong. The command in this case is
of the form
CAL n.nnn
No units are sent, and the value must be in fixed point format.
If a serious mistake is made when connecting a DUT (such as leaving the fixture OPEN after
being prompted for a SHORT), the calibration MAY fail due to an A/D overload. If the message
“A/D current input ovrrng” is displayed or returned as a prompt, the calibration must be aborted
by sending STOP. There is no way to back up and continue from the last successful part of the
calibration; it must be restarted from the beginning.
NOTE:
The 19xx calibration procedure is designed to allow calibration with a wide range of cables and fixtures. There is no
specification for how big a mistake is required to cause the calibration to fail.
If the FAIL light on the front panel
flashes during calibration, the setup should be rechecked and the calibration repeated.
When a calibration completes normally, the new data are automatically saved to nonvolatile
memory. It is not necessary to send the SAVE:SAVE sequence to cause them to be updated. If
the cal kit data are updated during the calibration, the new values will be saved only after a
successful calibration. If the cal kit data are updated at any other time, it is necessary to send
SAVE:SAVE to cause them to be written to nonvolatile memory.
Unlock the front panel by sending
SYST:
LOCK
OFF
Summary of Contents for 1910
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Page 107: ...Theory Page 103 of 110 Figure 4 4 Detector Circuits Es IL Ex PL PH Voltage Current...
Page 108: ...Page 104 of 110 Theory Figure 4 5 Digital Signal Processor Es Ex CPU DSP A D Vin A Vin B...
