4.18.7.2 Spans of Source Currents
In the synthesised active resistance technology used in Option 135, the current sourced
from the UUT must fall within a maximum of two spans of values for each selected
resistance value. This can be extrapolated using Ohm’s law to indicate the maximum
voltage on each range that the UUT can supply to the virtual resistive load the 9100
produces. The internal architecture of Option 135 has been designed to suit the output
voltage versus resistance curves for a typical range of insulation testers, and this is the
default SuperI (Super Current) mode. Under normal circumstances, you should not have
to change this value when performing insulation resistance tests on the 250V, 500V or
1000V range of most insulation meters.
However, if the source currents do not fall within expected parameters, Option 135 will
provide prompts to the user to suggest a course of action.
4.18.7.3 User prompts and messages
Shown on the opposite page is a brief list of the user prompts which may appear during
the operation of the unit, and their implications.
Under normal operating conditions, the only message you should see is ‘UUT polarity
reversed or no applied UUT voltage’. This will occur when you turn the 9100 output
ON before pressing the TEST button on the UUT. The 9100 detects that no current is
flowing through the circuit and presents the user with the above message. This should be
ignored provided that it disappears within a second of pressing the TEST button on the
UUT.
4.18-14 Section 4: Using the Model 9100: Insulation/Continuity Function (Option 135)
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