Triplett 9007-A - Manual (Page 34)

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7.7.5 If the displayed value is less than
“200” (decimal point
not shown), a more accurate reading may be obtained
by setting the RANGE switch to a lower range. Rotate
the RANGE switch to the next lower position and
observe the reading on the LCD display. If the RANGE
switch is already on the lowest position (i.e. 200
Ohms), no greater measurement resolution can
be obtained.
Notes:
a) The 2M, 20M, and 200M ranges require several seconds to stabilize.
b) The 200M range reads about 10 LSD high. To obtain an accurate
reading, short the test leads together and observe the residual
reading (usually 8 to 12 LSD). For the best accuracy, subtract
observed reading from subsequent measurements.
c) To obtain the most accurate reading on the 200
Ω range, short the
test leads together and note the
“residual resistance” reading.
It is typically less than 0.5
Ω . Subtract this value from subsequent
readings on the 200
Ω range.