Keysight DAQ970A User Guide

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 (2
26
-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 ( 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 count-
ing. 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.
4Measurement Tutorials
226 Keysight DAQ970A User's Guide

Keysight DAQ970A Specifications

General

Scan Rate	Up to 450 channels/sec
Connectivity	USB, LAN, GPIB (optional)
Display	4.3-inch color LCD
Operating Temperature	0 °C to 50 °C
Number of slots	3 slots
Measurement Types	DCV, ACV, DCI, ACI, 2-wire resistance, 4-wire resistance, frequency, temperature, capacitance
Voltmeter	6.5 digit
Resolution	22 bits
Memory	Non-volatile memory