Sartorius QC34EDE-S, Service Manual

16

2.

Adjustment using the PSION server

– Switch the scale to the BPI mode (see page 11).
– Switch on the PSION server and call the CAS program (version 4.4 or

newer)

– Select the menu item “Electr-zero-point” from the “Diagnosis” submenu
– With no load on the weighing pan, a value of 14.8 % ±11% should

appear in the PSION display.
If the value displayed is outside the tolerance limits, you can adjust this
voltage by changing the solder bridges LB7 and LB8.

LB7

LB7/LB8

LB8

LB7/LB8

Zerp Point Offset Value

1 / 2

1 / 1

1 / 2

2 / 2

< 25,8 %

open

close

open

open

> 3,8 %

close

open

close

open

After adjusting the zero point offset, proceed with the adjustment of the span
(sesitivity) (with the PSION server, if desired).

Adjusting the Linearity

Note:

There are two methods for adjusting the linearity:

1. As described in this manual, or
2. Using the MC1 PSION server

– Test the linearity of the scale in 1000g steps over the entire weighing

range.

– If any deviation is greater than the tolerance values given, you need to

adjust the linearity.

– Set the code “1 9 5” in the scale operating menu (external

linearization accessible).

– When 0.0g is displayed, press the 

e

 key and hold it for about 3

seconds; then release it.

– The first linearization value is displayed.
– Place the prompted weight on the middle of the weighing pan.
– After the weight is stored, the next weight value is displayed.
– Each linearity support point is called and stored.
– When this routine ends, the scale returns to the normal operating mode.
– If desired, reset the menu item “1 9 “ to the standard setting.

Note:

After linearization, make sure you perform the adjustment of the span
(sensitivity).