Bosch WPG 012.00 Operating Instructions Manual page 11

A
Pointer in green area for all 3
measurements:
Diodes OK.
Resistance values equal for all
3 measurements:
Stator winding OK.
If connection to the collector rings is impossible, connect to
DF and ground. However, due to contact resistances measu-
rement produces higher values which fluctuate as the rotor
turns.
Diode Ok if
measurement 1 = full
measurement 2 = max.
No deflection:
Diode defective (short cir-
cuit)
Resistance values not equal:
Stator winding has interturn
short circuit (unsolder leads
and test with measuring brid-
ge).
No deflection:
Diode defective (open cir-
deflection cuit)
0.8 mA
B
Pointer in red area:
Diode has open circuit.
(Test again as individual di-
ode after unsoldering.)
Note:
Ask vehicle manufacturer for
rated values.
Diode defective if
measurement 1 and
measurement 2
show full deflection (short cir-
cuit).
C
11