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Chapter 6
DT9874 Block Diagram
Figure 28
CJC Per
1
+
2
3
–
4
1
+
2
3
–
4
84
shows the block diagram of the DT9874 MEASURpoint instrument.
+10 nA Break
Isolated
Detection
DC-DC
+
24-Bit
x20
A/D
–
Point
Channels 0 to 15
+425 μA
Isolated
Current Source
DC-DC
2.5 Hz Filter
24-Bit
A/D
Sense
Return
Channels 16 to 31
Isolated
DC-DC
2.5 Hz Filter
24-Bit
Ω
1 M
A/D
400
Sense
100
10
Return
Gain Select
Channels 32 to 47
Figure 28: Block Diagram of the DT9874 MEASURpoint Instrument
64 kB
Digital Input
SRAM
Digital Output
Control
USB 2.0
FPGA
Processor
Calibration
ROM
1 of 8
Isolators
1 of 8
Isolators
Power LED
USB LED
Limit LED
Open TC LED
USB 2.0
ID ROM
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