Chapter 3 Hardware Overview
PCI-6023E/6024E/6025E User Manual 3-4
©
National Instruments Corporation

Figure 3-2. Dither

Multichannel Scanning Considerations

The PCI-6023E, PCI-6024E, and PCI-6025E boards can scan multiple

channels at the same maximum rate as their single-channel rate; however,

pay careful attention to the settling times for each of the boards. No extra

settling time is necessary between channels as long as the gain is constant

and source impedances are low. Refer to Appendix A, Specifications, for a

complete listing of settling times for each of the boards.

When scanning among channels at various gains, the settling times may

increase. When the PGIA switches to a higher gain, the signal on the

previous channel may be well outside the new, smaller range. For instance,

suppose a 4 V signal is connected to channel 0 and a 1 mV signal is

connected to channel 1, and suppose the PGIA is programmed to apply a

gain of one to channel 0 and a gain of 100 to channel 1. When the

a. Dither disabled; no averaging b. Dither disabled; average of 50 acquisitions

c. Dither enabled; no averaging

100 200 300 4000 500
-4.0
-2.0
0.0
2.0
4.0
-6.0

d. Dither enabled; average of 50 acquisitions

LSBs
LSBs
LSBs
LSBs
6.0
100 200 300 4000 500
-4.0
-2.0
0.0
2.0
4.0
-6.0
6.0
100 200 300 4000 500
-4.0
-2.0
0.0
2.0
4.0
-6.0
6.0
100 200 300 4000 500
-4.0
-2.0
0.0
2.0
4.0
-6.0
6.0

a. Dither disabled; no averaging b. Dither disabled; average of 50 acquisitions

c. Dither enabled; no averaging

100 200 300 4000 500
-4.0
-2.0
0.0
2.0
4.0
-6.0

d. Dither enabled; average of 50 acquisitions

LSBs
LSBs
LSBs
LSBs
6.0
100 200 300 4000 500
-4.0
-2.0
0.0
2.0
4.0
-6.0
6.0
100 200 300 4000 500
-4.0
-2.0
0.0
2.0
4.0
-6.0
6.0
100 200 300 4000 500
-4.0
-2.0
0.0
2.0
4.0
-6.0
6.0
PCI.book Page 4 Wednesday, September 16, 1998 9:09 AM