USB-2404-UI User's Guide
Functional Details
12
TEDS sensor connections
The USB-2404-UI supports class II TEDS "smart" sensors only. Connect the two TEDS lines to
TEDS Data
(T+) and
TEDS Common
(T–), and ensure that neither T+ nor T– is tied in common to any of the signal inputs
(terminals 3 through 6).
Signal source connections
You can connect ground-referenced or floating signal sources to the USB-2404-UI. For optimum signal quality,
use shielded cables and twisted pair wiring whenever possible.
When making a floating connection between the signal source and the USB-2404-UI, make sure the voltages on
the positive and negative connections are within the channel-to-earth voltage range. Refer to the
Specifications
chapter for operating voltages and information about overvoltage protection.
Figure 5. Connecting a grounded signal source
Figure 6. Connecting a floating signal source
Don't connect to signals or use for measurements within category III or IV
Refer to the "
Safety voltages"
section in the
Specifications
chapter for information about Measurement
Categories.
Timing options
The USB-2404-UI supports four timing options. Each option is optimized for different types of applications by
using different ADC conversion times.
High Speed
: optimized for high-speed applications at the expense of noise rejection.
Best 60 Hz Rejection
: optimized for rejection of 60 Hz noise.
Best 50 Hz Rejection
: optimized for rejection of 50 Hz noise.
High Resolution
: optimized for maximum overall noise rejection, and provides a good rejection of both
50 Hz and 60 Hz noise.
Refer to the analog input specifications for the conversion time and rejection ratio of each option.
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