Data Log Mode

The Data Log mode is standard on the 34465A and 34470A only, as is available only from the DMM's front panel. Data Log mode provides a front–panel user interface that allows you to set up data logging into the instrument’s non–volatile memory, or to internal/external file(s), without programming, and without a connection to a computer. Once you have finished collecting data, you can view it from the front panel, or you can transfer the data to your computer. Data Log mode allows you to log a specified number of readings, or readings acquired for a specified period of time, to instrument memory or to internal or external data files.

To select Data Log mode, press [Acquire] Acquire > Data Log. You can then select the Sample Interval (time between measurements - for example, 500 ms), Duration as either an amount of Time or a number of Readings, whether to Start after a Delay or at a specific Time of Day, and whether to Log to Memory or Log to File(s). After configuring the data logging parameters, press [Run/Stop]. Data logging will begin following the specified Delay or at the specified Time of Day.

Caution

Loss of data possible - local to remote transition clears instrument memory: When data logging or digitizing to memory, if you access the instrument from remote (send a SCPI or common command)* and then return to local (by pressing [Local]), the readings in memory are cleared and the instrument returns to Continuous mode.

For data logging only, you can prevent this situation by data logging to a file instead of to memory (see Data Log Mode for details). You can also prevent this from happening for data logging or digitizing by taking steps to keep the instrument from being accessed from remote. To prevent remote access, you may want to disconnect the LAN, GPIB, and USB interface cables from the instrument before starting the measurements. To prevent remote access via LAN, you can connect the instrument behind a router to minimize the possibility of remote access. You can also disable the various I/O interfaces from the front panel menus under [Utility] > I/O Config.

To view the status of a data logging or digitizing operation remotely, use the instrument’s Web User Interface. The Web User Interface monitor does not set the instrument to remote.

*When accessed from remote, the instrument will continue data logging or digitizing to completion, and you can retrieve the readings from remote.

Data Log Mode Features

Data Logging and the Trend Chart Display