Channel Gain Queue - Measurement Computing miniLAB 1008 User Manual

miniLAB 1008 User's Guide
Combining these two error sources in
±10 V range. This is a graphical version of the typical accuracy specification of the product.
The accuracy plots in Figure 3-12 are drawn for clarity and are not drawn to scale
Ideal +9.77mV + 20 mV
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 Ta
Element
0
1
2
3
When a scan begins with the gain queue enabled, the miniLAB 1008 reads the first element, sets the appropriate
channel number and range, and then acquires a sample. The properties of the next element are then retrieved,
and another sample is acquired. This sequence continues until all elements in the gain queue have been selected.
When the end of the channel list is detected, the sequence returns to the first element in the list.
This sequence repeats until the specified number of samples is gathered. You must carefully match the gain to
the expected voltage range on the associated channel—otherwise, an over range condition can occur. Although
this condition does not damage the miniLAB 1008, it does produce a useless full-scale reading. It can also
introduce a long recovery time from saturation, which can affect the next measurement in the queue.
Figure 3-12 , we have a plot of the error band of the miniLAB 1008 for the
Input Voltage
9.77mV
0
Ideal
Figure 3-12. Error band plot
Table 3-4. Sample channel gain queue list
Channel
CH0
CH0
CH7
CH2
3-12
Ideal +9.77mV + 20 mV Ideal +9.77mV + 20 mV
+FS
Ideal
Ideal -(9.77mV + 20 mV)
Output Code
2048
4095
-FS
Range
BIP10V
BIP5V
BIP10V
BIP1V
Functional Details
ble 3-4 .