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Fluke 8845A Manual

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Front-Panel Operation
Using the Analyze Functions 3
3-13
With the desired digit selected, press the soft key labeled -- to decrement the digit
or ++ to increment the character. The right most character is the multiplier. This
character can be set to p, n, μ, m, k, M, or G.
5. Press ENTER to set the selected limit.
6. Press ENABLE to start the limits testing.
Note
Since the high and low limits are independent of each other, both high and
low limit conditions could be satisfied by a measurement. In this case, the
Meter gives priority to the low limit condition by displaying LOW and
setting the low bit of the questionable data event register.
Refer to the Programmers Manual for instructions on setting the limits remotely.
Setting an Offset Value
The offset function provides a means of displaying the difference between a measured
value and a stored offset value. This type of measurement is referred to as a relative
measurement.
There are two methods of entering an offset value into the Meter. The first method is to
enter a specified number into the offset register either through the front-panel or over the
remote interface. Previously stored values are replaced with the new value. The offset
value is stored in volatile memory and is set to zero when power is applied to the Meter
or the Meter receives a reset through the remote interface.
The second method is to measure the desired reference value through the Meter’s input
connections and press Z. The measured value is placed into the offset register and the
display immediately starts showing the difference between measurements and the stored
value.
Note
The Zero key cannot be used to zero a DB or DBM measurement. Refer to
“Measuring AC Voltage” in Chapter 4 of this manual.
To enter an offset value through the front-panel:
1. Press J.
2. Press the MATH soft key
3. Press the OFFSET soft key.
To select the digit to adjust, press either <-- or -->.
With the desired digit selected, press the soft key labeled -- to decrement the digit
or ++ to increment the character. The right most character is the multiplier. This
character can be set to p, n, μ, m, k, M, or G.
4. Press ENTER to set the value in the offset register.
Note
Limits and Offset are Math functions that cannot be active simultaneously.
Using MX+B
The MX+B function provides a means of calculating a linear value using a measured
value (X) and two constants: M and B. The constant M represents a gain, while the
constant B represents an offset.
… 57 …


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