Keysight E1412A, User'S Manual And Scpi Programming Manual, Page: 240 / 243

Keysight E1412A Digital Multimer User Guide ccxxxix
General Guidelines for Increasing Measurement Speed Measurement Speed and Accuracy Trade-offs
readings are output until all readings have been taken and stored in internal
memory (RAM). This results in a burst-then-transfer mode of operation. The
multimeter can store a maximum of 512 readings in its internal memory.
READ?
The READ ? command does not store readings in internal memory (RAM) like the
INITiate command does. For example:
CONF:VOLT:DC
SAMP:COUN 200
READ?
! Takes 200 readings and puts them in the output
buffer
The READ? command causes the E1412A Multimeter to start taking readings as
soon as the trigger requirements have been met. For example, if the trigger
source is
IMMediate , the readings are started immediately. If the trigger source is
EXT , then the readings are started when an external trigger is received. The
multimeter immediately places those readings in the multimeter's output buffer
so they can be retrieved via the GPIB bus (or other I/O interface such as VXLink)
by the controller. If the controller cannot take the readings from the output buffer
fast enough, the multimeter will suspend taking measurements until there is
room to place the readings in the output buffer. You can have a variable reading
rate if your controller is busy doing other tasks instead of emptying the output
buffer to make room for more readings.