Fluke Biomedical 190M III Series, Руководство пользователя

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190M Series III
Users Manual
26
Relative Meter Measurements
A relative measurement displays the present measurement result relative to a defined reference
value. You can use this feature to monitor input activity (voltage, temperature) in relation to a
known good value.
To make a relative voltage measurement:
1. Obtain a reference value.
2. Press
M
to show the METER key labels.
3. Measure a voltage to be used as the reference value.
4. Press 2 to set RELATIVE to ON . ON is highlighted.
This saves the reference value as reference for subsequent measurements. Observe the
ADJUST REFERENCE soft key (
3
) that enables you to adjust the reference value.
5. Measure the voltage to compare to the reference.
Now the large reading is the actual input value minus the stored reference value. The
bargraph indicates the actual input value. The actual input value and the reference value are
displayed below the large reading (ACTUAL: xxxx REFERENCE: xxx). See
Figure 16 .
Figure 16. Making a Relative Measurement
To adjust the reference value:
1. Press
3
to open the ADJUST REFERENCE menu.
2. Use
g f
to select the digit to adjust.
3. Use
h i
to adjust the digit. Repeat until finished.
4. Press E to use the new reference value.