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HP VXI E1432A User Manual

Page 130

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Input Count Division

The tachometer can be programmed to divide the input signal. For
example if a signal is coming in at 100 counts per second, the tachometer
can be set to look at only every 10th count for a result of 10 counts per
second.

Holdoff Time

The tachometer can be programmed to wait for a specified period of time
between counts that it will detect. After a count is detected, subsequent
counts will be ignored until the holdoff time has passed.

Block Diagram

Holdoff Ctrl
1 of N select

32-bit
Counter

32-bit
Latch

System
Trigger

FIFO

10-20 MHz

Reset

Holdoff Ctrl
1 of N select

32-bit
Latch

FIFO

Tach/Ext Trig

Tach

Analog
Conditioning

Analog
Conditioning

Channel 1

Channel 2

Ctrl & Status
Registers

or paged A24 VXI

DSP "B" Bus

Figure 7-15: Tachometer option block diagram

HP E1432A User's Guide

The Tachometer Option

7-3

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