E20-10
User Manual
8.
Problems solution under abnormal
situations
This Appendix attempts to classify possible abnormal situations which can occur in real
practice and provides troubleshooting recommendations to the user.
External appearance
of abnormal
Possible reasons
Troubleshooting measures
Computer operating
system records
unexpected
disappearance of
connection via USB
interface during the
operation. Indicator is
yellow for a short time
or constantly or blinks
1) Connection with USB
cable is lost or USB cable is
defective
2) Through currents via
common wires connected to
E20-10
devices in your
circuit are so high, that it
will lead to USB interface
unsteady operation.
Recover the contact, replace the cable
Start with detecting through current flow circuit in
your connection diagram. To this effect you should
disconnect in series signal source and load
connectors (except power input and USB) and, if
upon next disconnecting USB interface operates
steady, it means, that you have fount external
device generating circuit of high through current
flow via USB. Then, it is required either to ground
common wire of detected device relatively to
computer housing or to isolate this device
galvanically bu some means. See
recommendations in Ch.6.
In signal spectrum
digitalized by
E20-10
the components you
have not in your
signal are present
1) Poor cores screening
2) Current circuit provoking
this disturbance via common
wires is present in your
connection diagram. When
coaxial cables closing from
the signal source (without
braiding disconnection from
signal source) the
disturbance exists and when
the disturbance disappears
when cable is fully
disconnected from source, it
means in-phase disturbance
behavior
Use high quality screening
Appropriate measures:
– Use in-phase EMC filter at output of relevant
signal source.
- Connect common wires of all devices in one
grounding point by shortest way using wire of
maximum section.
- Use auxilary galvanic isolation device of
minimum capacity between part galvanically
isolated. See recommendations in Ch.
Suspicions on the
failure of
E20-10
equipment appeared
while operating with
E20-10
with your
software
.
Your program may not
operate properly on
E20-
10or E20-10
is actually
faulty.
Check the suspect functions of
E20-10
using
programs delivered by
L-Card
(or actually
applying provided programming examples). In
case the failure is confirmed, contact
L-Card
.