6.2 Performance of Cable Length
Measurements within the Reference Range
To allow measurement of customer specific cable
types, reference ranges have been integrated in the
UNITEST Echometer 3000. The user can calibrate
and save the reference ranges for the specific cable
types.
6.2.1 Calibration of Customer Specific Cable
Types
" Switch on UNITEST Echometer using the
key.
" Change to the reference range pressing
the key, e.g. reference level I. REF I is
indicated on the display.
" Connect the red test lead to the red socket and
the black test lead to the black socket of the m-
range.
" Connect two leads in parallel of the cable to be
measured using the alligator clamps.
" To set the measurement unit (m/ft) press the
key. ''m'' or ''ft'' is indicated on the dis-
play.
" Set measurement range selection dial to a free
memory location, e.g. switch position 1.
100.0 m is indicated on the display.
" Set the known length of the cable to be calibrat-
ed using the or keys.
" Save the length of the reference cable pressing
and keys. A simple signal
sound is audible.
Note cable type, switch position and reference level
Now the length measurement of the cable type cal-
ibrated can be performed as described in section
6.1.
The reference range accuracy values depend
on the calibration accuracy of the customer
specific cable type. To comply with the accu-
racy values in accordance with the specified
technical data, the user must perform the cali-
bration of the cable type as described in the in-
struction manual.
6.2.2 Deletion of Reference Ranges
If the user requires to assign the reference ranges
to other cable types, the reference range must first
be deleted.
Free memory locations of the reference ranges are
indicated by the display ''100.0''. Already assigned
memory locations are indicated by the display ''- -
-''.
" Set UNITEST Echometer 3000 to the reference
range to be deleted.
''- - -'' is indicated on the display.
" Press the key once. The message
''100.0'' is displayed.
" If the alligator clamps are open press
and keys. An error measure-
ment is generated and indicated by the message
''Error''.
The reference range is deleted.
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