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3.5.3 Buffered Data
Streaming
The teslameter provides a buffer of measurements for applications where continuous
data, high speed streaming, or digital input synchronization is desired. The buffer
returns up to 128 of the most recent measurements in a comma separated format.
Each measurement has a time stamp in an ISO 8601 format that is precise to the mil-
lisecond. When the buffer is queried, the data is cleared. To obtain continuous data,
the buffer must be queried faster than it is filled. At a 10 ms averaging window the
buffer is filled every 1.28 seconds, therefor it should be queried about every half sec-
ond. For more information about buffer best practices, applications, and example
code please see the
Fast Magnetic Field Mapping with F71/F41 Teslameters
white
paper (
https://www.lakeshore.com/docs/default-source/product-downloads/fast-
magnetic-field-mapping-with-f-series-teslameters.pdf?sfvrsn=6284a805_6
).
3.5.4 Analog Output
The analog output can provide voltage proportional to:
D
The raw (amplified) Hall voltage
D
The corrected field reading
Be sure to connect the analog output to a high impedance input or it may interfere with
the sensitive measurement circuitry.
3.5.4.1 Corrected Field Reading
Setting the analog output to "corrected" results in an output voltage that is directly
proportional to the front panel field readings.
D
When a multi-axis probe is connected, either the X, Y, Z, or vector magnitude field
reading can be selected.
D
The corrected output voltage updates 2,000 times per second
Corrected input is intended for use in DC mode only. When in AC or high-frequency mode,
the output’s 2,000 times per second update rate results in voltages that represent the
RMS value from the previous 0.5 ms. For alternating fields below 2 kHz, less than a full
period will be contained within the window, resulting in fluctuating output voltages.
FIGURE 3-20
Analog Output
