Showa 5683, Operation Manual

Page: 51 / 68

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Fig. 7-1 Check Item Chart (2)
Yes：
Set measuring range to 20k to 200 using measuring range selection
knob (8). (See measuring range LED (11).)
Symptom 2 No signal is output.
Isn’t the measuring range set to OFF? (Doesn’t OFF illuminate on measuring
LED (11)?)
No
Is the level of level meter move?
Input a calibration value using calibration value input switch (14).
Isn’t output cable disconnected?
Yes
Yes
Is the output cable of output connector 1
(OUTPUT1) short-circuited?
No
Yes
Make a repair.
No
No
A failure in internal components
of the amplifier unit
Symptom 3 The bridge is balanced but the zero position drift with time.
Press the surface of the strain gauge softly. Then, does the level of level meter (2) move?
Yes： Remove the strain gauge and paste a new strain gauge.
Set the measuring range to OFF using measuring range selection knob (8) (OFF illuminates
on measuring LED (11).). Disconnect the bridge circuit from the amplifier unit, and then
measure the isolation resistance of the bridge circuit.
No
Does the isolation resistance have 60 M ohm?
Is the temperature compensation
for strain gauges made?
Possibly a lead accidentally
touch the ground line.
Does a lead touch the ground line?
Yes： Make a repair.
No：
Remove the strain gauge and
paste a new strain gauge
Yes No
Yes： Adjustment of internal
components of the
amplifier unit.
No：
Perform temperature compensation
for the strain gauge. Lower the bridge
voltage.