Zero Point Offset Value; Checking The Zero Point Offset Value; Adjusting The Zero Point Offset Value - Sartorius Basic plus Service Manual

20

Zero Point Offset Value

(Strain Gauge System)

Checking the Zero Point Offset Value

Always check the zero point offset value after installing a new strain gauge
system (see page 25) or when the zero point offset changes as a result of
mechanical influences.
- The data for zero point offset tests weights and zero point offset voltage are
contained in the "Adjustment/Calibration Data Sheet for Basic
- Open the balance (see page 27).
- Set the overload stops (see page 18).
Procedure:
- Connect the digital voltmeter between pin 6 of the IC 106 on the analog
PCB (204b) and the ground (⊥).
- Set the measuring range of the digital voltmeter to 2 V DC; remove the
weighing pan and, if necessary, the pan support (104 or 201).
- Switch the balance on.
- Compare the values displayed on the digital voltmeter with those given in
the "Adjustment/Calibration Data Sheet for Basic
point offset values.
If the values shown are different from those given in the "Adjustment/
Calibration Data Sheet for Basic
be readjusted.
- If the values shown are within the tolerance range given, close the balance
before proceeding with the other adjustments (off-center load, linearity,
adjustment/calibration) (see page 27).

Adjusting the Zero Point Offset Value

This adjustment is necessary after a new strain gauge system is installed, or
when the zero point offset changes as a result of mechanical influences.
- Switch off the balance and disconnect it from the power supply.
- The test procedure is the same as for checking the zero point offset value.
- Close the LB1,3 solder bridge and open LB1,1 and LB1,2 on the analog
PCB (204b) (see page 25).
Balances" for zero
plus
Balances", the zero point offset value must
plus
Balances".
plus