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Chapter 8 Tutorial
Multifunction Module
Totalizer
The HP 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.
Signal
Conditioning
TTL
AC
Threshold Jumper
26
-1). The count rolls over to "0"
Totalizer
Software
On / Off
Reset
Counter
2.5 V Threshold (TTL)
Data
8
395
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