Metrohm 787 KF Titrino - Manual (Page 50)

3.3. Diagnosis
787 KF Titrino 46
pot.meter dV/dt  10?
• Turn knob ‘dV/dt’ to the right stop and press .
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 .
diagnose press key 0...9
7 Polarizer test
• Press <7>.
polarizer test
• Press .
dummy resistor 14.3kΩ ?
• Connect resistor switch-box (or suitable resistor 14.3 kΩ 0.1%) using 3.496.5070
cable to ‘Pol’ socket. Switch-box to 14.3 kΩ.
• Press .
Test sequence:
1. An asterisk flashes during the test.
2. In case of an error an error message appears. (If for example the switch-box is not
connected, error 100 appears).
3. If no error is found, after about 15 s display shows
polarizer test o.k.
• Press .
diagnose press key 0...9
• Remove cable and resistor switch-box.