MC PCIe-DIO96H Podręcznik Użytkownika Pobierz pdf (Strona 112)

Universal Library User's Guide Analog Input Boards - USB-1616HS, USB-1616HS-2, and USB-1616HS-4

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ChanArray ANALOG: USB-1616HS-4: 0 to 3

USB-1616HS-2: 0 to 1

DIGITAL16: FIRSTPORTA (FIRSTPORTB must be configured as an output)

Rate ANALOG: Up to 1 MHz

DIGITAL16: Up to 12 MHz (system-dependent) if no analog channel is

selected. Otherwise up to 1 MHz.

Range BIP10VOLTS ( 10 V)

Hardware considerations

Associating CJC channels with TC channels

The TC channels must immediately follow their associated CJC channels in the channel array. For accurate

thermocouple readings, associate CJC channels with the TC channels as listed in the following table:

CJC channels

TC channels

CJC0

TC0

CJC1

TC1 and TC2

CJC2

TC3

CJC3

TC4

CJC4

TC5 and TC6

CJC5

TC7

When the AI-EXP48 board is installed:

CJC6

TC8 through TC11

CJC7

TC12 through TC15

CJC8

TC16 through TC19

CJC9

TC20 through TC23

CJC10

TC24 through TC27

CJC11

TC28 through TC31

The board must be configured for differential inputs when using thermocouples

TC inputs are supported by differential mode configuration only.

Channel count

For input and output scans, the count must be set to an integer multiple of the number of channels or a

BADCOUNT error is returned.

Sampling and update rates

Sampling and update rates are system-dependent. Data overruns/underruns may occur with higher sampling

rates when using BACKGROUND and CONTINUOUS modes. To avoid this, use a larger buffer/count size, or use

NONSTREAMEDIO mode, if supported. The minimum size buffer is 256 for cbAOutScan()/AOutScan(). Values

less than that result in a BADBUFFERSIZE error.

Settling time

For most applications, settling time should be left at the default value of 1 µs. However, if you are scanning

multiple channels and one or more channels are connected to a high impedance source, you may get better

results by increasing the settling time. Keep in mind that increasing the settling time reduces the maximum

acquisition rate. You can set the time between A/D conversions with the ADC Settling Time option in

InstaCal. Select between 1 µs, 5 µs, 10 µs, or 1 ms.

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