National-instruments Quadrature Input Module FP-QUAD-510 Instrukcja Użytkownika Pobierz pdf (Strona 8)

FP-QUAD-510 8 www.ni.com

The velocity range is the maximum velocity that can be measured

for a given timebase. The velocity register uses a 15-bit counter,

which gives a maximum number of counts of 2

, or 32,768. So, the

velocity range for a given timebase is calculated using the

following formula:

where V

rng

is the velocity range in counts per microsecond and T is

the timebase in microseconds.

The velocity resolution is the velocity accuracy for a given

timebase and is determined using the following formula:

where V

res

is the velocity resolution in counts per millisecond and

T is the timebase in microseconds.

Index Status Channel Operation

The FP-QUAD-510 includes four discrete input channels, channels

12 through 15, which contain the status of the Index signal for axes

0 through 3 respectively. This signal is latched to a 1 when the

condition at the axis inputs is Phase A = 0, Phase B = 0, and

Index = 1. This bit remains latched until it is read, at which point it

is cleared automatically.

Table 2.

Velocity Ranges

Length of Timebase

(in µs)

Velocity Range

(in counts/µs)

Velocity

Resolution

204.8 ±160 4.883 counts/ms

409.6 ±80 2.441 counts/ms

819.2 ±40 1.221 counts/ms

1638.4 ±20 610.4 counts/s

3276.8 ±10 305.2 counts/s

6553.6 ±5 152.6 counts/s

13107.2 ±2.5 76.29 counts/s

26214.4 ±1.25 38.15 counts/s

rng

32768±

------------------=

res

1000

------------=

1 2 3 4 5 6 7 8 9 10 11 12

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National-instruments Quadrature Input Module FP-QUAD-510 Instrukcja Użytkownika Strona 8

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