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Chapter 6
Block Diagrams
This section includes the block diagrams for the DT9871U, DT9871, and DT9872 TEMPpoint
instruments, DT9873 VOLTpoint instrument, and DT9874 MEASURpoint instruments.
DT9871U Block Diagram
Figure 28
CJC Per
Point
84
shows the block diagram of the DT9871U TEMPpoint instrument.
+10 nA Break
Isolated
Detection
DC-DC
+
24-Bit
x20
A/D
–
1 of up to 48 Channels
Calibration
ROM
Figure 28: Block Diagram of the DT9871U TEMPpoint Instrument
1 of 8
64 kB
Digital Input
SRAM
Isolators
1 of 8
Digital Output
Isolators
Control
FPGA
USB 2.0
Processor
Power LED
USB LED
Limit LED
Open TC LED
USB 2.0
ID ROM
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