Measurement-computing PCI-DAS1602/16 Manuel d'utilisateur télécharger pdf (Page 17)

PCI-DAS1602/16 User's Guide Functional Details

Software selects the bipolar/unipolar input configuration and input range. The table below lists the analog input

ranges and resolutions for the available input configurations and gains.

Input range and resolution

Bipolar Range

Resolution

Unipolar Range

Resolution

±10 V

305 µV

0 to 10 V

153 µV

±5 V

153 µV

0 to 5 V

76.3 µV

±2.5 V

76.3 µV

0 to 2.5 V

38.1 µV

±1.25 V

38.1 µV

0 to 1.25 V

19.1 µV

Burst mode

Channel-to-channel skew results from multiplexing the A/D inputs. It is defined as the time between

consecutive samples. For example, if four channels are sampled at a rate of 1 kHz per channel, the channel

skew is 250 µs (1 ms/4).

Burst mode minimizes channel-to-channel skew by clocking the A/D at the maximum rate between successive

channels. Burst mode timing is illustrated in Figure 4. At the 1-ms pulse, channel 0 is sampled. After 5 µs,

channel 2 is sampled. Channel 3 is sampled 5 µs after channel 2 is sampled. No samples are then taken until the

next 1-ms pulse, when channel 0 is sampled again. In this mode, the rate for all channels is 1 kHz, but the

channel-to-channel skew (delay) is now 5 µs, or 20 µs total. The minimum burst mode skew/delay on the PCI-

DAS1602/16 is 5 µs.

CH0

CH1

CH2

CH3

CH0

CH1

CH2

CH3

Delay

The length of the delay between bursts is

set by one of the internal counters, or may

be controlled via the external trigger.

5µS

Burst mode pacer is

fixed at 5.0 µS

Figure 4. Burst mode timing

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 30 31

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