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probes be inserted to an adequately depth into the material being mea
-
sured. Measuring temperature using a surface sensor can be especially
difficult as the sensor is directly exposed to ambient.
Error Message at Power Up
The 1502A reports an error during the power up self-test.
On power up the 1502A performs a self-test of several of its key components.
A failure of a component will cause an error message to be displayed such as
“Err 4”. The possible error messages and their meanings are as follows:
Err 1
Static RAM failure.
Err 2
Nonvolatile RAM failure.
Err 3
Internal data structure error.
Err 4
ADC initialization failure.
Err 5
ADC operation error.
Generally, each of these conditions require a qualified factory technician to re-
place a faulty component. Contact the factory for assistance. One possible ex-
ception might be if a large static discharge nearby disturbs the circuits. Cycling
the power off and back on again may allow the 1502A to resume normal oper-
ation. Another might be if the AC source voltage is incorrect, e.g. using 115 V
when the 1502A is configured for 230 V. Check the source voltage and the
1502A’s configuration and make sure they agree.
38 Manual Rev. 952801 Hart Scientific
10 Troubleshooting
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