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PAT4 incorporates a historic data facility that enables previous test results to be viewed at the time of testing. This powerful feature enables you to spot
any dangerous degradation of the appliance since its last test. Whilst previous and current test results may each be considered acceptable in their own
right against the pre-defined limits, there are instances where two very different readings will indicate significant degradation of appliance safety. e.g.
Insulation test March 1998 = 50 MΩ Pass limit = 7 MΩ
Insulation test March 1999 = 10 MΩ Pass limit = 7 MΩ
Both readings are clearly a pass, but if the degradation continued it would not be long before the asset insulation fell below the limit of 7 MΩ causing
the appliance to fail the pre-set limits.
Historic test data can only be viewed in Manual test mode (see Setup Autopass/Manual testing). When historic test data is available the test result
screen changes slightly. See the insulation test example below.
From previous test
1 The Insulation resistance is displayed. The asterisk symbol (*) in the top left corner indicates that historic
data is present. To view the historic data, press the asterisk key.
2 This example shows that the last insulation test result stored in memory is > 50MΩ and the
3 indicates
that this was a pass at the last test. If the asset had failed the test an 8 would be displayed.
3 To revert to the current test result simply press the asterisk * key again and
PASS or FAIL the test. The
test sequence for the appliance continues.
To next test
PAT4 stores both the current and the previous test results for each asset.
When data is uploaded to
PAT4 from XPress software
TM
, the historic data will also be transferred. However, data will not be transferred if the previous
test was not performed using a PAT4.
Historical Data
* Insulation Res.
FAIL >50MΩ *PASS
* Insulation Res.
Mem >50MΩ
3
* Insulation Res.
FAIL >50MΩ
*PASS
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