Description
of Accuracy in Bitrode Equipment
note number - hgn0001
There are many factors that need to be taken into account when an accuracy
specification is determined. This involves adding up all the published tolerances
of the components effecting accuracy. For example: The shunts we normally
use in the equipment are rated for .25% initial accuracy and can vary +/-.02%
from zero to 80 degrees C. The 1% resistors we use in our amplifier circuits
can vary as much as 100PPM per degrees C. Also the A/D chips we use are rated
for +/-.003% linearity error. Obviously temperature has a big influence on
accuracy and the expected operating ambient temperature range and the temperature
rise inside the unit must be factored in.
Bitrode uses a 0.1% calibrated shunt and a meter that has been calibrated
to 0.05% for all of our equipment calibration. From this we state that the
accuracy of our equipment for specific equipment is as follows:
|
Model
|
Full Scale Accuracy
|
|
LCN
|
0.1%
|
|
CN
|
0.1%
|
|
SCN
|
0.1%
|
|
FT(N)
|
0.1%
|
|
DTN
|
0.1%
|
|
CT
|
0.1%
|
|
TPN
|
0.1%
|
|
RCT
|
-
|
|
RCN
|
0.1%
|
|
LCR(N)
|
-
|
|
SCF
|
-
|
|
CD(N)
|
1.0%
|
|
CC(N)
|
1.0%
|
|
CR(N)
|
1.0%
|
|
CCF
|
1.0%
|
|
TFX
|
-
|
|
VRL
|
-
|
|
VRX
|
-
|
Please note that this is for the standard operating temperature of 0 to 40
C.
When we state that the accuracy is say 0.1% of the full scale, we are talking
about the highest current, voltage and power that is specified for the custom
built equipment. For example: If you have a unit that has a current range
of 0 to 50 amps, the accuracy of the current is 0.1% of 50 amps, or +/- 0.05
amps for the entire range. Same applies to a voltage range of 0 to 18 volts,
the accuracy is 0.1% of 18, or +/- 0.018 volts.
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