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4 Measurement Tutorials
Totalizer
The DAQM907A module has a 26-bit totalizer which can count pulses at a 100 kHz rate. You can manually read the
totalizer count or you can configure a scan to read the count.
You can configure the totalizer to count on the rising edge or falling edge of the input signal.
Using the hardware jumper labeled "Totalize Threshold" on the module, you can control the threshold at which an
edge is detected. Move the jumper to the "AC" position to detect changes through 0 volts. Move the jumper to the
"TTL" position (factory setting) to detect changes through TTL threshold levels.
The maximum count is 67,108,863 (226-1). The count rolls over to "0" after reaching the maximum allowed value.
You can control when the totalizer actually records counts by providing a gate signal (
and
terminals on the
module). A TTL high signal applied to the "G" terminal enables counting and a low signal disables counting. A TTL
low signal applied to the
terminal enables counting and a high signal disables counting. The totalizer only counts
when both terminals are enabled. You can use the either G terminal, the
terminal, or both. When a gate is not
connected, the gate terminal floats to the enabled state, effectively creating a "gate always" condition.
Keysight DAQ970A/DAQ973A User's Guide
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