DMTA-10055-01EN, Rev. A, February 2015
Chapter 8
140
— Off
— 0–1 V
— 0–10 V.
• Mapping
Used to select the scale of the output voltage based on:
— Range: The current screen range
— GateWidth: The width of the selected output gate
— Fixed Range: A fixed screen range independent of the current screen
range.
• Fixed Range
Used to set the fixed screen range of the scaled output when Mapping is set
to Fixed Range.
• Load
Used to select the value for the impedance of the peripheral device measuring
the analog output of the EPOCH 650 instrument.
Matching the impedance of the output from the EPOCH 650 with the
impedance of the input to the peripheral device allows the instrument to
properly offset the analog output to produce predictable output voltages
based on screen measurements. For example, a measurement of 10 mm
(.393 in.) on a 100 mm (3.93 in.) screen range, with an analog output range of
0–10 V, should produce an analog output of 1 V. Without impedance
matching, the value can be skewed above or below the expected 1 V output
value (0.95 V or 1.02 V, etc).
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