
Chapter 4
46
Connecting Analog Input Signals
The DT730 screw terminal panel supports both voltage and current loop inputs. You can
connect analog input voltage signals to the DT730 in the following configurations:
•
Single-ended
– Choose this configuration when you want to measure high-level signals,
noise is not significant, the source of the input is close to the DT730 or DT730-T screw
terminal panel, and all the input signals are referred to the same common ground. When
you choose the single-ended configuration, all 32 analog input channels are available.
•
Pseudo-Differential
– Choose this configuration when noise or common-mode voltage
(the difference between the ground potential of the signal source and the ground of the
DT730 or DT730-T screw terminal panel or the difference between the grounds of other
signals) exists and the differential configuration is not suitable for your application. This
option provides less noise rejection than the differential configuration; however, all 32
analog input channels are available.
•
Differential
– Choose this configuration when you want to measure low-level signals
(less than 1 V), you are using an A/D converter with high resolution (> 12 bits), noise is a
significant part of the signal, or common-mode voltage exists and you want the most
noise rejection. When you choose the differential configuration, 16 analog input channels
are available.
Note:
We recommend that you connect all unused analog input channels to analog ground.
This section describes how to connect single-ended, pseudo-differential, and differential
voltage inputs, as well as current loop inputs to the DT730 or DT730-T screw terminal panel.
Connecting Single-Ended Voltage Inputs
Figure 7
shows how to connect single-ended voltage inputs (channels 0, 1, and 8, in this case)
to the DT730 and DT730-T screw terminal panel.
Figure 7: Connecting Single-Ended Voltage Inputs
(Shown for Channels 0, 1, and 8)
+
DT730 or
DT730-T
Panel
Signal
Source
-
+
Vin 0
Vin 1
-
TB99
TB36
Analog In 0
Analog In 1
TB100
Jumper W1
Installed
W1
+
-
Vin 8
TB35
Analog In 8
Analog Ground
TB98
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Содержание DT3000 Series
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Страница 155: ...Index 154 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...