3M
™
Advanced Systems Tester 900AST Series
36
Press the key to select either the wire gauge
menu, the temperature, or the length (Distance
to Strap) for editing. If you select the wire gauge
menu, press the
and keys to select the
desired gauge. If you choose temperature or length,
enter the new value using the blue numeric keys.
Either the Temperature or Length must be specified
as unknown. Use the
key to specify a field as
unknown. The ‘#’ sign will appear in the cleared
field.
Note: Always enter the temperature of the wire
itself, not the ambient temperature.
Press the
key to accept the changes and return
to the previous screen. Press the
key to return
without saving the changes. Press the
key again
to return to the hookup screen.
Other RFL Errors
If the RFL measurement terminates due to a time-
out, a “Yield Sign” will be displayed next to the
DSTF or RSTF. This indicates that the results may
not be accurate. This could be caused by excessive
noise on the circuit.
If the temperature is known and the specified
conductor length is greater than the measured
distance to strap, then the calculated unknown
lengths would be negative. This will cause a “Yield
Sign” to be displayed to the left of the setup boxes
and “***” to be displayed in the “Distance to
Fault” and “Distance Strap to Fault” boxes
If the red and green clips are reversed, the
“Resistance to Fault” calculation may return a
negative value. This will cause a “Yield Sign” to
be displayed next to the DSTF or RSTF result and
“***” in the DTF and DSTF boxes.
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