Section 7 Appendix
GLOSSARY OF TERMS
ACCURACY is defined as the agreement of a balance reading with the value as set by a national
standard.
CAPAClTY of the sample suspension is defined as the maximum total load (sample, container,
wire, etc.) that can be suspended from the sample loop. As the load increases beyond the rated
capacity, the following will occur in the order shown:
The beam will slightly bend which will reduce repeatability.
The motor coil will sag into its stops, causing it to become inoperable but
preventing damage.
The hangdown loop will break preventing serious damage to the beam.
REPEATABILITY (or Precision) is defined by Cahn as the standard deviation of 10 consecutive
weighings of the same mass under ideal conditions.
READABILITY is the least significant digit which can be resolved from the readout under normal
conditions and set up.
SENSITIVITY is the smallest mass difference that can be detected by the balance.
PERFORMANCE SPECIFICATION FOR Cahn C-34/C-35
LOOP A
LOOP B
Capacity
1.5 grams
3.5 grams
Weight range/sensitivity
25 mg/0.1
1250 mg/ 10
250 mg/1.0
Tare: Mechanical
1.5 grams
3.5 grams
Electrical
250 mg
1250 mg
Accuracy (percent of weight
.0012%
.008%
range limited by precision)
Precision Ultimate
0.1g
1
Fraction of load
.0001%
.001
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