15
7 - Fault Diagnosis
INTRODUCTION
This section gives details of some possible problems and how to correct
them.
FAULT CHECK LIST
If the 1044 is completely dead without any indication of the display
working, check the following -
1) Battery condition - replace battery.
2) Polarity of external power unit - reverse connections.
The 1044 indicates an output but there is not an output at the termi-
nals.
1) The output protection fuse has blown. Check why this might have
blown, commonly caused by a signal being applied while still in the
source mode. Replace with the correct fuse.
Current output not available.
Is there a load connected to the output? If not, current will not flow through
the circuit.
The value selected on the display drops when the unit under test is
connected.
This is a feature of the 1044 where the ‘actual’ value is indicated. This is
probably insufficient current drive from the 1044 because the unit under
test is loading the output beyond its 20mA drive capability. Check the unit
under test for faults.
It might be due to a low battery condition. Check to see if ‘BAT’ is showing
on the LCD display.
To Next Page
Loading...