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In addition, changes in these ratios over time can be observed and used for pre-
ventative maintenance (e.g. to monitor the aging of the insulation of a population
of rotating machines).
The DAR and PI ratios are calculated as follows:
PI = R 10 min / R 1 min
(2 values to be noted during a 10 minute measurement are at the end of 1 minute
and 10 minutes)
DAR = R 1 min / R 30 sec
(2 values to be noted during a 1 minute measurement are at the end of 30 seconds
and at the end of 1 minute)
Note that the times of 1 and 10 minutes for the calculation of PI and 30 & 60 sec-
onds for the calculation of DAR are those currently considered standards and pro-
grammed as defaults in the instrument. They can be modified in SET-UP mode to
adapt to a possible change in a standard or to the needs of a specific application.
Interpretation of the results:
DAR
< 1.25
< 1.6
> 1.6
4.2.2
Secondary Function - PRINT
The secondary function of this button gives access to the print menu below.
There are two or three choices in the print mode depending on when it is
accessed:
• If you access the print mode right after the completion of a test, you will
see "Print result" as the first choice.
• If you access the print mode without running a test, "Print memory" will be
your first choice.
Print result:
Immediate printing of a measurement
following a measurement or after access
to the MR (Memory Recall) mode.
Print memory:
Printing of stored data.
Baud rate / Port:
Display of baud rate selected in the
SET-UP menu.
32
PI
< 1
< 2
< 4
> 4
Print result
Print memory
Baud rate / Port
Condition of Insulation
Poor or
even Dangerous
Good
Excellent
PRINT
9600 / RS232
Megohmmeter Model 5070
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