The 34465A/70A can operate in the continuous, data log, or digitize mode as described below.
The 34460A/61A DMMs always operate in the continuous mode -data log and digitize modes are not available on these models.
Continuous mode is the default mode for all Truevolt DMMs. With the factory default settings, the DMM continuously makes DCV measurements with autorange and autozero on, NPLC set to 10 PLCs, etc. (see factory defaults for details).
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.
The digitize mode applies only to the 34465A/70A with the DIG option, and as is available only from the DMM's front panel. The digitized mode provides a front–panel user interface that allows you to quickly set up digitized measurements.
Digitizing is the process of converting a continuous analog signal, such as a sine wave, into a series of discrete samples (readings). The figure below shows the result of digitizing a sine wave. This chapter discusses the various ways to digitize signals. The importance of the sampling rate, and how to use level triggering.
On entering data log or digitize mode, the DMM configures these settings:
On entering data log mode, the DMM configures these settings:
On entering digitize mode, the DMM configures these settings: