Spectrum Brands MC.31XX 用户手册

Analog Inputs

Setting up the inputs

(c) Spectrum GmbH

43

This analog acquisition board uses separate input amplifiers and converters on each channel. This gives you the possibility to set up the de-
sired and concerning your application best suiting input range also separately for each channel. The input ranges can easily be set by the 
corresponding input registers. The table below shows the available input registers and possible standard ranges for your type of board. As 
there are also modified version availble with different input ranges it is recommended to read out the currently available input ranges as 
shown later in this chapter.

The different input ranges are set with the help of relais. These relais need a settling time if they are changed, so that the relais are fully set 
and didn’t influence the signal when the board is started. The following table shows the related register to adjust the wait time. Any changes 
of the wait time below the default value should only be done after detailed tests of the boards behaviour. Setting lower values may be possible 
or may not be possible depending on the application that is done.

If you want to know, how many different input ranges are available on the actual board per channel, you can easily read that information 
by using the read-only register shown in the table below.

Additionally cou can read out the minimum and the maximum value of each input range as shown in the table below. The number of input 
ranges is read out with the above shown register. 

The following example reads out the number of available input ranges and reads and prints the minimum and maximum value of all input 
ranges.

SPC_AMP0

30010

r/w

Defines the input range of channel0.

SPC_AMP1

30110

r/w

Defines the input range of channel1.

SPC_AMP2

30210

r/w

Defines the input range of channel2.

SPC_AMP3

30310

r/w

Defines the input range of channel3.

SPC_AMP4

30410

r/w

Defines the input range of channel4.

SPC_AMP5

30510

r/w

Defines the input range of channel5.

SPC_AMP6

30610

r/w

Defines the input range of channel6.

SPC_AMP7

30710

r/w

Defines the input range of channel7.

50

± 50 mV calibrated input range for the appropriate channel.

100

± 100 mV calibrated input range for the appropriate channel.

200

± 200 mV calibrated input range for the appropriate channel.

500

± 500 mV calibrated input range for the appropriate channel.

1000

± 1 V calibrated input range for the appropriate channel.

2000

± 2 V calibrated input range for the appropriate channel.

5000

± 5 V calibrated input range for the appropriate channel.

10000

± 10 V calibrated input range for the appropriate channel.

SPC_RELAISWAITTIME

200700

read/write

Wait time in ms for relais settling before the start of the board. Default value is 50 ms.

SPC_READIRCOUNT

3000

r

Informs about the number of the board’s calibrated input ranges.

SPC_READRANGEMIN0

4000

r

Gives back the minimum value of input range 0 in mV.

SPC_READRANGEMIN1

4001

r

Gives back the minimum value of input range 1 in mV.

SPC_READRANGEMIN2

4002

r

Gives back the minimum value of input range 2 in mV.

...

...

r

...

SPC_READRANGEMAX0

4100

r

Gives back the maximum value of input range 0 in mV.

SPC_READRANGEMAX1

4101

r

Gives back the maximum value of input range 1 in mV.

SPC_READRANGEMAX2

4102

r

Gives back the maximum value of input range 2 in mV.

...

...

r

...

SpcGetParam (hDrv, READIRCOUNT,       &lNumberOfRanges);
for (i = 0; i < lNumberOfRanges; i++)
    {
    SpcGetParam (hDrv, SPC_READRANGEMIN0 + i, &lMinimumInputRage);
    SpcGetParam (hDrv, SPC_READRANGEMAX0 + i, &lMaximumInputRange);
    printf („Range %d: %d mV to %d mV\n“, i, lMinimumInputRange, lMaximumInputRange);
    }