Metrohm NIRS XDS Transmission OptiProbe Analyzer - Manual (Page 49)

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to assure best performance.
7.1.3 IPV Setup (Instrument Performance Verification)
IPV Setup is provided as a method to record initial instrument response to calibrated photometric
transmission standards. This is normally performed upon initial installation, immediately after
Instrument Performance Certification (IPC), when a lamp has been changed, or when standards have
been re-certified.
This operation uses the XC-1310 Standard Set.
This set contains five photometric standards,
labeled beginning with T01, T02, T03, T04, and
T05. For the TSS30020 set, they would be:
• T0130020
• T0230020
• T0330020
• T0430020
• T0530020
This set also contains a polystyrene/didymium
wavelength standard, which is optional in
Wavelength Certification.
When the photometric standards are scanned during IPV Setup, a file is generated, and is stored in
the Vision directory. This file has the same format as the standards file, but a “V” is placed into the
fourth character of the file name. This indicates that it is a “verification” file. For example, if the
standards set has the serial number TSS30020, the IPV Setup file is named TSSV0020.
With the IPV Setup file stored, the user can run Photometric Test to check the repeatability of
instrument performance. This is detailed later in this manual, in “Evaluation Diagnostics.” Photometric
Test compares the current performance of the instrument to the file stored during IPV Setup, and
reports differences. If the instrument differences exceed established tolerance limits, the test reports
that, so corrective action may be initiated.
It is important that IPV Setup, and later Photometric Test, both be run with the same options selected
under Configure, Options. The System Manager should pay particular attention to this. If options are
not consistently applied, there will be a bias in the results of Photometric Test. The bias may be
enough to cause test failure, depending upon selections.
Because the XDS is a sensitive instrument, it can detect differences in temperature of the standards,
and results may be affected slightly. To minimize this effect, be sure the standards are at a stable
temperature before use.
IPV Setup and Photometric Test both require use of the calibration fixture as shown on the next
page. Run IPV Setup as follows: