32
Zero-point Offset Value
The zero-point offset value adjustment is necessary for adapting the bridge
voltage of the strain-gauge load receptor to the operating range of the
balance/scale electronics. This may be necessary:
– after replacing the strain-gauge system
– after replacing the main PCB
– if the span cannot be adjusted (even with the service software) and the error
code „E 02“ is displayed
– when the zero-point offset voltage has changed and is outside the tolerance
limit (e.g., due to the strain gauge load receptor being „bent“)
Adjusting the Zero-point Offset Value
– Open the balance/scale (see page 48)
– Connect the cable from the digital voltmeter (DVM) to IC15, pin 6 and
ground
– Place the shock absorber and the weighing pan/load plate on the balance/
scale and reconnect the power supply
– Use the DVM to test the preload voltage with no load on the balance/scale
Target (mV)
A/D converter output (%)
- 0.25 to - 0.49
4.3% to 8.3%
– If the zero-point offset voltage is outside the tolerance range listed above,
balancing resistor R29 must be adjusted in accordance with the table below.
offset1.eps
Summary of Contents for Talent Series
Page 55: ...55 ...
