miniLAB 1008 User's Guide
Functional
Details
For example, the miniLAB 1008 exhibits a typical calibrated gain error of ±0.2% on all
ranges. For the ±10 V range, this would yield 10V × ±0.002 = ±20 mV. This means that
at full scale, neglecting the effect of offset for the moment, the measurement would be
within 20 mV of the actual value. Note that gain error is expressed as a ratio. Values
near ±FS are more affected from an absolute voltage standpoint than are values near
mid-scale, which see little or no voltage error.
Combining these two error sources in
, we have a plot of the error band of
the miniLAB 1008 for the ±10 V range. This is a graphical version of the typical
accuracy specification of the product.
Figure 4-12
Figure 4-12. Error band plot
The accuracy plots in Figure 4-12 are drawn for clarity and are not drawn to scale
-FS
+FS
Input Voltage
0
4095
9.77mV
2048
Output Code
Ideal
Ideal +9.77mV + 20 mV
Ideal +9.77mV + 20 mV
Ideal -(9.77mV + 20 mV)
Ideal -(9.77mV + 20 mV)
Ideal
Ideal +9.77mV + 20 mV
Channel gain queue
The miniLAB 1008's channel gain queue feature allows you to set up a scan sequence
with a unique per-channel gain setting and channel sequence.
The channel gain queue feature removes the restriction of using an ascending channel
sequence at a fixed gain. This feature creates a channel list which is written to local
memory on the miniLAB 1008. This list is made up of a channel number and range
setting. An example of a four-element list is shown in
.
Table 4-4
4-15