National Instruments NI SHC68 Bedienungsanleitung

USER GUIDE

Digital Flying Lead Cable

Accessory for Single-Ended NI Digital Waveform Generator/Analyzers

The NI SHC68-H1X38 cable is a single-ended cable that breaks out each

NI digital waveform generator/analyzer signal into two 0.1 inch header

receptacles, one receptacle each for the signal and ground. The

NI SHC68-H1X38 cable provides an easy way to connect NI single-ended

high-speed digital waveform generator/analyzer devices to various types of

devices and circuits for interfacing, testing, or analysis.

This cable offers connectivity similar to that found on a typical logic

analyzer, so you can use it in logic analyzer-type applications. Unlike a

typical logic analyzer, however, this cable also allows for simultaneous

pattern generation and acquisition so that it can be used in

stimulus/response applications as well.

This guide explains how to set up and use the NI SHC68-H1X38 cable with

single-ended NI digital waveform generator/analyzer modules.

Contents

What You Need to Get Started ............................................................... 2

Related Documentation........................................................................... 2

Parts Locator ........................................................................................... 3

Connecting Signals ................................................................................. 4

Using Your Accessory ............................................................................ 6

Specifications .......................................................................................... 7

Digital Flying Lead Cable User Guide 2 ni.com

What You Need to Get Started

To set up and use the NI SHC68-H1X38 cable, you need the following

items:

❑Compatible NI digital waveform generator/analyzer, installed in a PXI

chassis, compactPCI chassis, or PCI slot

❑The documentation included with the digital waveform

generator/analyzer and driver software

Related Documentation

The NI digital waveform generator/analyzer ships with several documents

designed to familiarize you with different aspects of the module. The

documentation set includes the following pieces:

•NI Digital Waveform Generator/Analyzer Getting Started

Guide—Read this printed document to set up the digital waveform

generator/analyzer and configure it to complete your first acquisition

or generation.

•NI Digital Waveform Generator/Analyzer Help—This online

document provides more in-depth information about the hardware

capabilities of the module, theory of operation, programming flow, and

software reference.

• NI digital waveform generator/analyzer specifications—These printed

documents provide specifications for your device.

©National Instruments Corporation 3 Digital Flying Lead Cable User Guide

Parts Locator

Refer to Figure 1 to locate connectors and components on the

NI SHC68-H1X38 cable. The lead pairs are shown in more detail in

Figure 2.

Figure 1. NI SHC68-H1X38 Cable Parts Locator Diagram

1 Lead Pairs 2 Removable Sleeving 3 68-Pin VHDCI Connector

Digital Flying Lead Cable User Guide 4 ni.com

Figure 2. Detailed Parts Locator Diagram for the Lead Pairs

Connecting Signals

Each DIO, PFI, and clock channel of the NI digital waveform

generator/analyzer connects to a corresponding pair of leads on the

NI SHC68-H1X38 cable.

The NI SHC68-H1X38 cable is separated into two bundles of 19 channels,

and each channel is split into a pair of leads for connecting the signal and

its associated ground. Table 1 describes the channels and shows how they

are grouped by bundle.

1 0.25 in. diameter 0.1 in. pitch

compatible receptacles

2 Strain-relief and label

3 Microcoaxial wire

4 Ground

Table 1. NI Digital Waveform Generator/Analyzer Signal Descriptions

Channel Signal Description Bundle

DIO <0..31> Bidirectional digital data channels 0

through 31. Refer to the documentation

for your NI digital waveform

generator/analyzer for information about

the number of available DIO channels on

your device. DIO <20..31> may not

apply to your device.

DIO<0..15>: Bundle A

DIO<16..31>: Bundle B

STROBE / PFI 5 For devices that have a STROBE

channel, this signal is the external

Sample clock source for dynamic

acquisition. Otherwise, this is

programmable functional interface

(PFI) 5.

Bundle A

123

©National Instruments Corporation 5 Digital Flying Lead Cable User Guide

CLKOUT / PFI 4 For devices that have a DDC CLK OUT

channel, this signal is the exported

sample clock signal. Otherwise, this is

PFI 4.

Bundle A

PFI <1..3> Programmable functional interface PFI

<1..3>.

PFI 1: Bundle A

PFI <2..3>: Bundle B

Reserved / PFI 0 For devices that have PFI 0 on a

front-panel SMB connector, this channel

is reserved and should not be used.

Otherwise, this channel serves as PFI 0

Bundle B

GND Each channel is split into a pair of leads.

The lead attached with the black wire is

the GND signal, which serves as the

ground reference for that particular

channel.

N/A

Table 1. NI Digital Waveform Generator/Analyzer Signal Descriptions (Continued)

Channel Signal Description Bundle

Digital Flying Lead Cable User Guide 6 ni.com

Using Your Accessory

The NI SCH68-H1X38 cable breaks out every signal through a 50 Ω

characteristic impedance microcoaxial cable, which is then split into the

two leads with receptacles. This cable was designed for both acquisition

and generation operations with your single-ended NI digital waveform

generator/analyzer. Refer to the Termination sections in the NI Digital

Waveform Generator/Analyzer Help to learn how to correctly terminate

your signals to achieve optimal signal quality.

For optimal signal quality, connect both the signal and ground receptacles

and twist the pair of leads together as shown in the following figure.

Figure 3. Using the NI SCH68-H1X38 Cable for Interface

The receptacles on the SHC68-H1X38 easily attach to standard 0.1 inch

pitch, 0.025 inch diameter header pins. The shipping kit for this cable also

contains ten 4 ×2 header-to-receptacle strips for one-time arrangement of

the flying leads. These strips are useful when you must disconnect and

reconnect the cable to rows of 0.1 inch test pins on a circuit board, for

example. You can easily find other adapters that provide male header pins

on one side and an array of connectors on the other side.

©National Instruments Corporation 7 Digital Flying Lead Cable User Guide

Specifications

Digital I/O

DIO Channels......................................... 32, single-ended

Control I/O Channels ............................. 6, single-ended

Typical Propagation delay ..................... 13.5 ns

Typical channel-to-channel skew........... ±250 ps

Typical characteristic impedance........... 50 Ω

Typical Input capacitance ...................... 150 pF

Physical

Length .................................................... 1.5 m

I/O Connectors ....................................... One 68-pin DDC Connector

38 header-receptacle pairs

(signal and ground)

National Instruments, NI, ni.com, and LabVIEW are trademarks of National Instruments Corporation.

Refer to the Terms of Use section on ni.com/legal for more information about National

Instruments trademarks. Other product and company names mentioned herein are trademarks or trade

names of their respective companies. For patents covering National Instruments products, refer to the

appropriate location: Help»Patents in your software, the patents.txt file on your CD, or

ni.com/patents.

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