DI-500/510 Series and DI-750/760 Series Hardware Manual
Getting Started
9
Signal Cable and the Differential Amplifier
A quick rule-of-thumb: Any application requiring a differential amplifier also defines a need for quality signal cable.
Four elements combine to ensure adequate quality signal cable: a twisted signal pair with low resistance stranded
copper conductors; surrounded by a multiple-folded foil shield; with a copper stranded drain wire; all contained
within an insulated outer jacket.
In applications where such signal cable is used, a dramatic decrease in noise pickup will be experienced. The drain
wire should be considered as the shield and should be connected as described in the section titled “Connecting a Dif-
ferential Amplifier” on page 7. Signal cable meeting all four criteria for quality is Belden No. 8641.
Labeling Analog Input Channels
Depending on the number of analog input channels your instrument has, it may be necessary to label them. For exam-
ple, say you are using a DI-510-64 or a DI-760-64 to record 64 analog input channels and you want to record the sig-
nal connected to channel 28. Looking at the instrument, there are two groups, or “banks,” of 32 inputs. Each bank
consists of channels 1 through 32 (64 total inputs). Since there are two channels labeled 28, how will you know which
one will be recorded? A small box is provided on the instrument panel to label banks of channels and avoid this prob-
lem. In order for you and the software (either W
IN
D
AQ
or the ActiveX Control Library) to tell these inputs apart, label
each bank of 32 inputs with a letter according to the following table (an ordinary pencil is sufficient):
If you are using this instrument by itself (not multiplexed
with other instruments):
…then write this letter in the box on the overlay:
DI-750-16
DI-500-16
not required
DI-750-32
DI-500-32
“A”
DI-760-32
DI-510-32
“A”
DI-760-48
DI-510-48
not required
DI-760-64
DI-510-64
“A” top 32 channels, “B” bottom 32 channels
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)RLO6KLHOG
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7ZLVWHG6LJQDO3DLU
6WUDQGHG&RSSHU&RQGXFWRUV
Free Datasheet http://www.datasheet4u.com/
