QuadTech Guardian 2500 Series Instruction Manual page 66

In some cases, the IR value displayed during a test will be the "greater than" symbol followed by
some resistance value, e.g., "> 25.0Mohm". The displayed resistance value is the maximum
resistance which can be measured accurately in the IR range being used by the 2530. Unless the
displayed value is ">5000.0Gohm", this means that the 2530 is unable to increase the sensitivity
for one or more of the following reasons:
1) The Autoranging utility is set to NONE. This locks the 2530 in the least sensitive IR range.
2) The Autoranging utility is set to LIMITED. This prevents the 2530 from selecting any range
more sensitive than the one which would be used if the DUT IR was exactly equal to the
programmed LOW LIMIT for the test in progress.
3) Autoranging is being defeated by a non-DC component of the input current. This may result
from operation in an electrically noisy environment (near large motors, arc welders etc.), but
is most likely the result of a DUT which has a significant parallel capacitance.
Press the UTILITY key and
If Enhanced Features is set for On, press
If Enhanced Features is set for Off, press
right arrow key to select Autoranging.
Press up/down arrow keys to select Autoranging, Full, None or Limited.
Press the UTILITY key to exit, or move to other Utility functions with the
key.
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right arrow key to select Enhanced Features.
Autoranging
Full
Autoranging
None
Autoranging
Limited
right arrow key to select Autoranging.
up/down arrow key to select On and press
Util
Util
Util
Operation/Programming
right arrow