External Data Logging (Elog)
Select the Measurement Function and Range
Specify the Integration Period
Select the Elog Trigger Source
Initiate and Trigger the Elog
Periodically Retrieve the Data
Terminate the Elog
External Data Logging
The external data logging function can only be programmed using SCPI commands.
The Keysight N7900 models have an "external" data logging function (Elog) that lets you continuously
log voltage and current measurements. Data logging is external to the instrument because it can only
be implemented using SCPI commands. Voltage and current measurement data is temporarily stored
in a FIFO (first-in, first-out) buffer located in the instrument. However, this buffer is only large enough
to hold about 20 seconds of accumulated measurements. This means that you must periodically
empty the internal buffer to an external storage device; otherwise the data in the buffer will be
overwritten.
The following table details the various data logging functions.
Function Description
Data Storage Buffers measurements for about 20 seconds and requires that the computer
periodically reads measurements to prevent the internal buffer from over-
flowing. The computer needs to provide the external data storage.
Measurement Functions Both output voltage and output current can be logged.
Integration Period Minimum integration period is 102.4 microseconds for one parameter with data
format set to REAL. During the specified integration period, the samples are
averaged, and min and max values are tracked.
Data viewing No front panel view or control. Data is collected and viewed externally.
Note that the Elog function uses the acquire trigger process to make the measurements.
Select the Measurement Function and Range
The following commands select a measurement function:
4 Using the Advanced Power System
158 Keysight N6900/N7900 Series Operating and Service Guide
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