VTI Instruments EX1000A, User Manual

Page: 86 / 320

VTI Instruments Corp.
86 EX10xxA Web Page Operation
Despite having the ability to conduct self-calibration at any time, there may be user applications that
require the use of self-calibration, but demand that it create non-volatile data. The
Store Current
Self Cal Data As Nonvolatile button saves the current self cal data to nonvolatile memory, enabling
it to be loaded upon instrument power cycle and reset. If this button is pressed when no current self
cal data is present, an error is generated. Since the existence of nonvolatile self cal data represents
a permanent (although revocable) change from the factory calibration settings, its presence is noted
on the
EX10xxA Main and Self Calibration pages.
Previously saved nonvolatile self cal data can be cleared through the use of the Clear Nonvolatile
Self Cal Data button. This operation does not clear the current self cal data, only that in nonvolatile
memory. If this button is pressed when no nonvolatile self cal data is present, an error is generated.
Alternatively, previously saved nonvolatile self cal data can be loaded as the current self cal data
through the use of the
Load Nonvolatile Self Cal Data button. If current self cal data previously
existed, it is simply overwritten and need not be cleared in advance. If this button is pressed when
no nonvolatile self cal data is present, an error is generated.
The ability to conduct a self-calibration is not affected by the existence of current self cal data or
nonvolatile self cal data. A performed self-calibration will simply overwrite any current self cal data
that already existed. It is not necessary to utilize the
Clear Current Self Cal Data button prior to
performing a new self-calibration. Similarly, the ability to store current self cal data as nonvolatile
is not affected by the existence of previously saved nonvolatile data. The old data is simply
overwritten and need not be cleared in advance.
NOTE As part of the self-calibration process, the EX10xxA is reset, returning all configuration parameters
to their default values. This reset also clears all volatile self-calibration data.
NOTE EX1044 system requires hard reboot after self-calibration process so that instrument will be
calibrated values gets loaded upon reboot.
NOTE Self calibration is not applicable for RX10xx since during factory calibration process each
instrument will be calibrated in precise manner and calibrated data gets stored in the instrument
memory. The instrument has to be sent to factory to perform subsequent calibration after the initial
calibration date is expired
Refer below section for Dynamic Calibration in RX1032
Dynamic Calibration in RX1032
The dynamic calibration should be conducted to calibrate the measurement drift due to the
temperature change. For every measurement scan, the values are adjusted based on the system
internal temperature.

The initial calculated Voltage and Temperature coefficients are stored into the RX1032
system.

At every measurement the measured values are calibrated dynamically using the stored
coefficients.

Based on the present temperature of the system, the values are calibrated and reported.
Get Calibration Files
This action page allows the user to download calibration data directly from the instrument. The
“Factory Calibration”, “Self Calibration”, and “Non-Volatile Self Calibration” links become active
after a calibration of that type has been performed. Once the link is clicked, an XML file will be
downloaded which contains the current calibration data for that type.