Metrohm NIRS XDS RapidLiquid Analyzer - Manual (Page 46)

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These will be measured later in Wavelength Certification, as a test of how well the instrument is
maintaining the settings established in Instrument Calibration.
7.1.5 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.
When the standards are scanned during IPV Setup, a spectral 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 TSSV30020.
With the IPV Setup file stored, the user can later 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. That is, if the IPV Setup file is acquired with Blank Correction switched on,
then Photometric Test should be performed using the same settings. 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 is run as follows:
Select IPV Setup from the Diagnostics menu.