Agilent Technologies 34901A User Manual page 398

Chapter 8 Tutorial
Multifunction Module
Totalizer
The 34907A 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.
+
Input Signal
(1V to 42V)
–
G
Gate
Input
G
GND
• 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.
0 V Threshold (AC)
• The maximum count is 67,108,863 (2
after reaching the maximum allowed value.
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Totalizer
Signal
Conditioning
TTL AC
Threshold Jumper
26
-1). The count rolls over to "0"
Software
On / Off Reset
Counter
2.5 V Threshold (TTL)
Data
8
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