Agilent Technologies L4400 - Manual (Page 229)

L4450A 64-Bit Digital I/O with Memory and Counter 8
L4400 User’s Guide 217
Totalizer Mode
Totalizer mode is the default operating mode for the counters. When the
counter is configured for
TOTalizer mode, it automatically starts running.
The totalized count can be read, reset, scanned, and monitored.
The simplest way to take a totalizer measurement is to use the MEASure
form of the command. For example, the following command configures the
totalizer on the first bank, initiates the measurement, and returns the
result. The data is returned in a floating point format.
MEAS:COUN:TOT? READ, (@1301)
You can also reset the totalizer count by setting the parameter to RRESet .
For example, the following command configures the totalizer on the first
bank, initiates the measurement, and returns the result. The totalize count
is reset when the data is read.
MEAS:COUN:TOT? RRES, (@1301)
Totalizer counts begin as soon as the channel is configured for the totalize
measurement. You can stop a count by sending
SENSe:COUNter:ABORt
command and restart the count using the SENSe:COUNter:INITiate
command.
The slope of the edges being counted can be configured using the
SENSe:COUNter:SLOPe command. By default, when started, the totalizer
counts rising edges.
Additionally, you can control when the edges are counted by setting the
gate source to external and providing a gate signal on the gate input.

In external gate mode the counter totalizes when the gate is asserted.

The gate time setting controls how long the counter totalizes. Once the
external gate has been de- asserted a new measurement must be armed via
the
SENSe:COUNter:INITiate command. The figure below shows an
externally gated totalizer measurement. The number of totalized counts is
‘5’ in this particular example.
Init
Ext Gate
Input