National Instruments Cable Box SHC68 H1X38 User Manual
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  
 
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.  
1
2
3
1
Lead Pairs  
2
Removable Sleeving  
3
68-Pin VHDCI Connector  
Figure 1. NI SHC68-H1X38 Cable Parts Locator Diagram  
© National Instruments Corporation  
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Digital Flying Lead Cable User Guide  
 
   
4
3
1
2
1
2
0.25 in. diameter 0.1 in. pitch  
compatible receptacles  
Strain-relief and label  
3
4
Microcoaxial wire  
Ground  
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.  
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  
DIO<0..15>: Bundle A  
DIO<16..31>: Bundle B  
generator/analyzer for information about  
the number of available DIO channels on  
your device. DIO <20..31> may not  
apply to your device.  
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  
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ni.com  
 
     
Table 1. NI Digital Waveform Generator/Analyzer Signal Descriptions (Continued)  
Channel  
Signal Description  
Bundle  
CLKOUT / PFI 4  
For devices that have a DDC CLK OUT Bundle A  
channel, this signal is the exported  
sample clock signal. Otherwise, this is  
PFI 4.  
PFI <1..3>  
Programmable functional interface PFI  
<1..3>.  
PFI 1: Bundle A  
PFI <2..3>: Bundle B  
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  
GND  
Each channel is split into a pair of leads. N/A  
The lead attached with the black wire is  
the GND signal, which serves as the  
ground reference for that particular  
channel.  
© National Instruments Corporation  
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Digital Flying Lead Cable User Guide  
 
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.  
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ni.com  
 
 
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 Corporation  
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Digital Flying Lead Cable User Guide  
 
 
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.  
© 2005 National Instruments Corporation. All rights reserved.  
374270A-01  
Nov05  
 

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