Using The Read? Command; Using The Initiate Command; Using The Fetch? Command - Fluke 8845A Manual

Digital multimeter
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8845A/8846A
Programmers Manual
Setting Range and Resolution Parameters
The MEASure? and CONFigure commands incorporate parameters for setting the
Meter's function, its range, and its resolution. Placing the input signal's expected
amplitude into the range value causes the Meter to select a range appropriate for the
supplied signal amplitude.
Although the frequency and period functions use a single range for all inputs between 3
Hz and 300 kHz, it is necessary to specify a range whenever specifing a resolution setting
for these functions. When specifying resolution, specify it in the units of the function
instead of number of digits. For ac or dc volts, specify the resolution in volts. The
resolution specification for frequency is in hertz.
A range parameter is required when specifying the resolution parameter.

Using the READ? Command

READ?
Description READ? causes the Meter to take a measurement the next time the trigger
Always process the reading(s) from the output buffer after each READ?
command. Failure to do so may cause some of the data from the previous
READ? command to appear in the response for the last READ? command.
For those times the buffer cannot be read after a READ? command, send a
device clear (DC1) before issuing another READ? command.

Using the INITiate Command

Once the Meter has been configured for a measurement, the INITiate command causes
the Meter to take a measurement when the trigger conditions have been met. The
measurement reading(s) are placed in the Meter's internal memory (up to 5,000 readings)
to be read at a later time using the FETCh? command.
With one exception, the INITiate command stops the Meter from accepting any other
remote commands until the Meter has completed both taking the measurement and
storing the reading. The exception occurs when the trigger source is set to BUS with the
TRIGger:SOURce command. Under this condition, the *TRG command or the IEEE-488
Group Execute Trigger will be processed to start the measurement.

Using the FETCh? Command

To process readings from the Meter's internal memory to the output buffer, send the
Meter a FETCh? command. With readings in the output buffer, a bus controller can then
retrieve the readings over the bus.
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condition is met after the READ? command is received. After the
measurement is taken, the reading is placed in the output buffer. The
READ? command will not cause readings to be stored in the Meter's
internal memory.
All measurements are sent to the output buffer until the buffer becomes
full, at which point the Meter stops taking measurements. To keep the
measurements running, measurements must be continually read out of the
output buffer.
Note
Note

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