4.2. Diagnosis
719 S Titrino
110
pot.meter dV/dt
10?
•
Turn knob ‘
dV/dt
’ to the right stop and press
<Enter>
.
Test
sequence:
a) In a first step, the frequency of the RC oscillator (analogue rate) is tested over a period
of 1 second.
b) In a second step, the frequency of the quartz oscillator (digital rate) is tested over a
period of 1 second.
c) If no error is found, after about 3 s it appears
motor-timer test o.k.
•
Press
<Clear>
.
diagnose press key 0...9
7
Analogue input test
•
Press
<7>
.
analog input test 1...5
7.1
Examination of highly insulated measuring inputs
•
Connect ‘Ind I’ measuring input to a voltage calibrator (e.g. Metrohm 773 pH simu-
lator) by means of a highly insulated cable (e.g. 6.2108.060). Set calibrator to 0 V.
•
Press
<1>
.
Input 1
0.0 mV
Tolerance: ± 0.5 mV
•
Set the calibrator voltage, on setting 'low ohmic' (with 773 = ~ 0.002 M
Ω
) to differ-
ent values (e.g. +1500 mV) and compare with the displayed value.
Tolerance (with ± 1500 ÷ 2000 mV) ± 1 mV. Be aware of the calibrator's tolerance.
•
Set simulator to high ohmic condition (with 773 = 1000 M
Ω
).
The displayed reading may vary slightly only (with 1500 mV
≤
1 mV)
•
Press
<Clear>
.
analog input test 1...5
•
Disconnect simulator from ‘Ind I’ input and connect to ‘Ind II’ input.
•
Press
<2>
.
Summary of Contents for Titrino 719 S
Page 2: ......
Page 6: ...1 2 Controls and parts 719 S Titrino 2 1 2 Controls and parts Front view of instrument...
Page 8: ...1 2 Controls and parts 719 S Titrino 4 Rear view of instrument...
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