REFLOW TRACKER Troubleshooting 51
Troubleshooting
For problems in communication between the logger and the PC and
for logger download error messages, see the ‘Troubleshooting’ chapter
of the dedicated User Manual for your logger.
For process problems revaled by temperature profiles, see p. 26 for
reflow and p. 35 for wave solder.
To troubleshoot problems with predictions in Easy Oven Setup,
see p. 42.
Checking the Data
If you suspect that invalid data may have been introduced into your
temperature profile (paqfile), perhaps by damaged thermocouples (see below),
select the View Data tab in Insight’s Analysis Window to view the raw data as
downloaded from the logger. The various types of invalid data which may be
contained in a paqfile are shown in the analysis grid as follows.
*OC* Open circuit. (Will occur if recording starts before thermocouples are plugged in.)
*NA* Telemetry data not received. Check antenna connectors.
*LO* Temperature measured was below the range of the logger.
*HI* Temperature measured was above the range of the logger.
*** Calculation cannot be performed (not necessarily because the data are invalid). Does
not appear in View Data analysis mode.
Typical causes of invalid or interrupted data are:
• Damaged thermocouple cable.
• Thermocouple becoming detached from plug/logger.
• Faulty connection at thermocouple’s hot junction.
Readings which are inconsistent with those of other thermocouples may be
caused by a short circuit (see below). The thermocouple concerned must be
replaced.
Open circuit readings can occur during a profile run if a thermocouple
becomes damaged. The logger will then continue sampling on that channel, but,
by default, an alarm will be registered. For further details of such alarms, or to
disable the alarm, select Tools > Options > Run Alarms.
Thermocouples with an intermittent open circuit may produce spiky, erratic
profiles. Note that spikes are inevitable when thermocouples are disconnected
from a running data logger.
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