95x Series Operating Manual - May 17, 2022
Page 111 of 155
SECTION 10 – PERFORMANCE VERIFICATION AND ADJUSTMENT
The 95x has been designed to give many years of service without needing calibration. However, particularly for
devices used to test for product safety, it is important to periodically ensure that the device is properly working
within its specifications.
There are three strategies recommended for periodic performance verification/adjustment of the 95x. Which one
is selected by the user depends on the user’s specific requirements regarding quality level and the availability of
equipment.
• Periodic Adjustment Calibration Only. This is the simplest of the strategies, while it gives the typical user a
reasonable degree of certainty that the 95x is performing to its specifications, it does not cross-check that
the calibration technique was performed correctly and does not account for some (rare) possible
malfunctions in the 95x.
• Periodic Adjustment followed by Verification. With this strategy the user ensures that the 95x was within
specification as received by performing the adjustment calibration and checking that the adjustments are
within the product specification, then checking that the calibration was correctly performed and checking
for the rare possible 95x malfunctions by means of the post-adjustment verification. This completely
ensures that the outgoing 95x meets its specifications but leaves the possibility of an error made during
the adjustment calibration leading to the incorrect indication that the incoming 95x did not meet
specifications.
• Periodic Verification – Adjustment – Verification. This is the most complete strategy but is also the
costliest in time. The time cost can be reduced by performing the initial verification and then only
performing the Adjustment – Verification components if the initial verification indicates that it is
necessary (as an example, only perform if beyond some percentage of specification in the initial
verification).
ADJUSTMENT CALIBRATION
The 95x employs internal software calibration adjustments, there are no physical adjustments required. These
adjustments are needed to correct for manufacturing tolerances in the components used in the 95x, it is important
to note that there is no calibration of design defects allowed for, giving the end user a high degree of certainty that
the 95x maintains its specifications. Typically, adjustment should be rarely needed; however, the user may wish to
perform it at periodic intervals to ensure optimal performance.
The adjustment calibration procedure for the 95x is an internally prompted sequence dependent on the actual
product model being calibrated.
Please take note of the following–
• The 95x should be fully powered and turned on for at least 10 minutes (1 hour is recommended) prior to
being calibrated. Initially there should be no connections to any of the 95x terminals and it is
recommended to not have any connections to the interface ports during the procedure.
• In many cases the same accuracy determining circuitry is used in several different modes of operation. As
an example, there is no difference between the DC and AC voltage modes of operation in the accuracy
determining circuitry of the 95x. Because of this the entire product can be calibrated with complete
certainty by only a few fairly simple calibrations.
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