Rosemount 3152, Reference Manual

Page: 56 / 80

Rosemount 3150 Series
Reference Manual
00809-0100-4835 Rev BD
July 2016
5-5
TEST TERMINAL
The test terminals are connected across a diode through which the
loop signal current passes. The indicating meter or test equipment
shunts the diode when connected to the test terminals. As long as
the voltage across the terminals is kept below the diode threshold
voltage, no current passes through the diode. To ensure that there is
no current leaking through the diode while making a test reading or
when connecting an indicating meter, the resistance of the test
connection or meter should not exceed 10 ohms.
ELECTRONICS ASSEMBLY
CHECKOUT
NOTE
Numbers in parentheses refer to item numbers in Figure 5-1.
NOTE
3150 Series transmitters contain electronic circuit boards which may
be static sensitive
. Therefore, observe proper ESD
precautions/techniques whenever the electronics assemblies are
handled and/or uncovered.
The electronics assembly (4) is not field-repairable and must be
replaced if defective.
To check the electronics assembly for a malfunction, substitute a
spare assembly into the transmitter using the procedures in this
section.
To remove the existing electronics assembly, refer to the steps
outlined in the
Electrical Housing Disassembly section.
To install the new electronics assembly, refer to the steps outlined in
Electrical Housing Reassembly section.
If this procedure reveals a malfunctioning assembly, return the
defective assembly to Rosemount Nuclear Instruments, Inc. for
replacement. See
Notices regarding field repair at the beginning of
this manual.