Sartorius MC 5, Руководство по обслуживанию, Страница: 30 / 49

30 SARTORIUS MC 5 Balance Stand 1/94
MC 5
External Calibration
Important: External calibration should be done only in exceptional cases
because calibration using internal weights is more accurate, as a rule. In
addition, the weights used to calibrate the microbalance at the factory in
Goettingen usually have a higher accuracy than do the external weights
normally available.
If you opt for external calibration, use external calibration weights with tolerances that are equal to or
better than accuracy class E2 (± 0.050mg for 5g) or E1 (± 0.015mg for 5g).
Note:
External calibration can be done in 3 different ways:
1. as described in this service manual
2. using the PSION server or
3. using the CAS program for personal computers and laptops
Important Note:
The microbalance will accept only a weight that is within a tolerance of approx. 2% of the factory-
programmed value. You can set the microbalance for greater variations only using the PSION server
(approx. 50% of the factory-programmed calibration weight) or the CAS program written for PCs and
laptops (in this case, the calibration weight is adjustable from 0 to 100% of the factory-programmed
value).
However, you should use only the PSION server or the CAS program for PCs and laptops to check and
adjust the calibration weight of this microbalance.
- Unload the pan and press the key (ERR 02 see page 36).
- When the display shows 0.000000g, hold down the key for
more than 3 sec. You will see the display shown on the left.
- As soon as >> C.I. << appears, continue to press the
key until >> C.E. << is displayed.
- Tare the microbalance using the key and press the key
to activate the external calibration routine.
- The calibration weight is now displayed.
- If necessary, use the numeric keys to enter a new, accurate
weight 5.0000xx (see Weight Certificate to enter the correct
value).
- Center the required weight (5g) on the pan and close the draft
shield.
- After the calibration weight has been stored, the microbalance
will return to the standard weighing mode.