Data Logging
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 con-
nection 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 fol-
lowing the specified Delay or at the specified Time of Day.
Data Log mode can be used with the DC voltage, DC current, AC voltage, AC current, 2-wire and 4-wire
resistance, frequency, period, temperature, capacitance, and ratio measurement functions (diode and con-
tinuity are excluded). The maximum reading rate is 1000 readings/s and the maximum duration is 100
hours resulting in a maximum number of readings of 360,000,000 to file. The number of readings you can
log to memory depends on the amount of instrument memory. With the MEM option, the limit is
2,000,000 readings; without the MEM option, the limit is 50,000 readings. By default, data logging imple-
ments auto trigger. The level and external trigger sources are not supported for data logging.
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
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
. 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 Logging Overview
This section is a summary of the steps involved in setting up data logging. Detailed steps are described
below in Detailed Data Logging Steps.
Keysight True
volt
Series Operating and Service Guide
81
Features and Functions
