DI–720/DI–722/DI–730 Series User Manual
Accessories
42
Note that when an input channel is configured for differential operation, the binding post associated with that chan-
nel's high (+) input assumes the channel number.
Connecting a Single-ended Amplifier
A single-ended amplifier is the most straightforward approach to connecting signals to the DI-205. However, to
derive adequate performance, the use of a single-ended amplifier requires that the signal to be measured is relatively
high level (greater than or equal to 1V full scale), and the distance from the signal source to the DI-205 is relatively
short (less than 15 feet). Assuming these conditions exist, a single-ended amplifier may be connected to your signal
source as follows:
Connecting a Differential Amplifier
A differential channel configuration is a special case approach to signal measurement that should be used with all
low-level measurements (less than 1v) or when the signal to be measured is located far away from the DI-205 (greater
than 15 feet). When in a differential operating mode, the amplifier sees the difference in voltage between the high (+)
and low (-) inputs. Differential amplifiers have the advantage of reducing common mode voltages (those appearing
simultaneously and in phase on both inputs). This capability may be leveraged to great advantage to reduce noise
riding on a signal of interest.
CHAN. 1
S. GND
S. GND
CHAN.9(1)
Signal Leads
Channel 1 configured
for single-ended input
CHAN. 1
S. GND
S. GND
CHAN.9(1)
Signal Leads
Channel 1 configured
for differential input
+ input
- input
(-)
(+)
1 of 16 analog grounds
1 of 16 analog inputs
Signal
Source
DI-205
Terminal Strip
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