HP VXI E1432A manual Input Count Division, Holdoff Time

HP E1432A User's Guide

The Tachometer Option

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

Channel 2

Tach/Ext Trig Analog

Conditioning

Holdoff Ctrl

1 of N select

System

Trigger

32-bit Latch

FIFO

10-20 MHz Reset

32-bit Counter

Ctrl & Status Registers

Channel 1
	Analog
Tach
	Conditioning

Holdoff Ctrl

1 of N select

32-bit Latch

FIFO

DSP "B" Bus or paged A24 VXI

Figure 7-15: Tachometer option block diagram

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