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12. COUNTING MODE (PC) This is the mode to determine the number of objects in a sample based on the standard sample unit
mass. The unit mass is the mass of one piece of the sample. The smaller the variables in each
sample unit mass are, the more accurate the counting will be. The AD-4212A/B series balance is
equipped with the Automatic Counting Accuracy Improvement (ACAI) function to improve the counting
accuracy.
Notes
Use samples with a unit mass of 1 mg or more (AD-4212A-100, AD-4212B series) or 10 mg or
more (AD-4212A-200/600/1000) for counting.
If the sample unit mass variable is too large, it may cause a counting error.
To improve the counting performance, use the ACAI function frequently or divide the samples
into several groups and count each group.
Selecting the counting mode
1 Set “Unit selection ( Unit )” parameter of the function table to pC (counting mode). For
details, refer to “5-2 Changing the Unit”.
Storing a sample unit mass
2 Press the SAMPLE key to enter the sample unit mass
storing mode.
To return to the counting mode without storing the sample
unit mass, press the CAL key.
3 To select the number of samples, press the SAMPLE key
several times. It may be set to 10, 25, 50 or 100.
Note
A greater number of samples will yield more accurate counting result.
4 Place a container on the weighing pan, if necessary. Press
the RE-ZERO key to cancel the weight (tare). The number
specified in step 3 appears.
e.g.: 25 0 pC is displayed if 25 is selected in step 3.
5 Place the number of samples specified on the pan. In this
example, 25 pieces.
6 Wait for the stabilization indicator to be displayed. Press
the PRINT key to calculate and store the unit mass. The
balance displays 25 pC (counting mode) and is set to
count samples with this unit mass. (The sample unit mass
stored, even if the AC adapter is removed, is maintained in
non-volatile memory.)
To improve the accuracy of the unit mass, proceed to step 8.