HP 34970A manual Totalizer Operations

Chapter 4 Features and Functions

Totalizer Operations

Totalizer Operations

The multifunction module has a 26-bit totalizer which can count TTL pulses at a 100 kHz rate. You can manually read the totalizer count or you can configure a scan to read the count.

∙ The totalizer channel is numbered “ 03”, where represents the slot number.

∙You can configure the instrument to count on the rising edge or falling edge of the input signal.

∙You can control when the totalizer actually records counts by providing

a zt”zt (G and G 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 “G” terminal enables counting and a high signal disables counting. The totalizer only counts when

both terminals are enabled. You can use either the G terminal, the G 4 terminal, or both. j“x t ztxvw3 x zt ”t

floats to the enabled state, effectively creating a “gate always” condition.

Input Signal

(Rising Edge)

Gate Signal

(High True)

Totalizer Input

Add to Total

∙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.

2.5 V Threshold (TTL)

0 V Threshold (AC)

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