Diagnosis of analog timer, Diagnosis of external inputs, outputs, 9 diagnosis – Metrohm 765 Dosimat User Manual
Page 30: Analog timer, 9 diagnosis of analog timer, 10 diagnosis of external inputs, outputs
3.2. Diagnosis
765 Dosimat
26
1.
Prepare instrument for diagnostic test (see chap. 3.2.3).
2.
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timer dig. test
3.
timer dig.
The frequency of the digital timer is measured during 1.5 s. If no fault is found, the following appears:
timer dig. o.k.
4.
diagn. key 0...9
3.2.9 Diagnosis of analog timer
The analog timer is that part of the electronic circuit in the dosimat which is responsable
for the analog spindle speed rate (adjustable with knob 'dV/dt').
1.
Prepare instrument for diagnostic test (see chap. 3.2.3).
2.
Turn knob 'dV/dt' fully to the right.
3.
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timer ana. test
4.
timer ana.
The frequency of the analog timer is measured during 1.5 s. If no fault is found, the following appears:
timer ana. o.k.
5.
diagn. key 0...9
3.2.10 Diagnosis of external inputs, outputs
This test is necessary only if the 765 Dosimat is interconnected with other instruments via
terminal A. Moreover, this test requires the test plug 3.496.8360 which is a facility for the
repair service. However, it can also be ordered by customers with the above order num-
ber.
1.
Prepare instrument for diagnostic test (see chap. 3.2.3).
2.
Without switching off the instrument, insert plug 3.496.8360 into location A. Take
care of the direction of the plug. Red banana plug to red socket 'D'.
3.
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extern in/output
4.
The test runs automatically. If no fault is found, the following appears:
ext. in/out o.k.