Spectrum Brands MI.61XX 用户手册
Analog Outputs
Setting up the outputs
(c) Spectrum GmbH
43
Maximum Output Range
In order not to generate distorted signals it is nec-
essary to keep the total output range as a combina-
tion of the set amplitude and offset within a range
of ±3000 mV.
essary to keep the total output range as a combina-
tion of the set amplitude and offset within a range
of ±3000 mV.
If this limit is exceeded a heavy distorted signal will
be seen and the signals waveform will be cut off at
the maximum range of +3000 mV or at the mini-
mum range of -3000 mV.
be seen and the signals waveform will be cut off at
the maximum range of +3000 mV or at the mini-
mum range of -3000 mV.
To avoid heavily distorted output signals please make sure to keep the signals in a range of ±3000 mV.
To give you an example how the registers of the amplitude and the offset are to be used, the following example shows a setup to match all
of the three signals shown in the offset figure.
of the three signals shown in the offset figure.
Output Filters
Every output of your Spectrum D/A board is equipped with a bypass
path and three fixed filters that can be used for signal smoothing.
The filters are located in the signal chain between the output amplifi-
cation section and the DAC, as shown in the right figure. Depending
on your type of board these filters are of differerent filter types and
have different cut off frequencies, as shown below. As well as the set-
ting for amplitude and offset, the settings for the filters can be changed
at any time. The board will not be stopped for changing the different
filters. You can choose between the different filters easily by setting the
dedicated filter registers. The registers and the possible values are shown in the table below.
path and three fixed filters that can be used for signal smoothing.
The filters are located in the signal chain between the output amplifi-
cation section and the DAC, as shown in the right figure. Depending
on your type of board these filters are of differerent filter types and
have different cut off frequencies, as shown below. As well as the set-
ting for amplitude and offset, the settings for the filters can be changed
at any time. The board will not be stopped for changing the different
filters. You can choose between the different filters easily by setting the
dedicated filter registers. The registers and the possible values are shown in the table below.
SpcSetParam (hDrv, SPC_AMP0 , 1000); // Set up amplitude of channel0 to ± 1.0 V
SpcSetParam (hDrv, SPC_AMP1 , 1000); // Set up amplitude of channel1 to ± 1.0 V
SpcSetParam (hDrv, SPC_AMP2 , 1500); // Set up amplitude of channel2 to ± 1.5 V
SpcSetParam (hDrv, SPC_OFFS0, 0); // Set the output offsets
SpcSetParam (hDrv, SPC_OFFS1, 500);
SpcSetParam (hDrv, SPC_OFFS2, -500);
SpcSetParam (hDrv, SPC_AMP1 , 1000); // Set up amplitude of channel1 to ± 1.0 V
SpcSetParam (hDrv, SPC_AMP2 , 1500); // Set up amplitude of channel2 to ± 1.5 V
SpcSetParam (hDrv, SPC_OFFS0, 0); // Set the output offsets
SpcSetParam (hDrv, SPC_OFFS1, 500);
SpcSetParam (hDrv, SPC_OFFS2, -500);
Register
Value
Direction
Description
SPC_FILTER0
30080
r/w
Sets the signal filter of channel0.
SPC_FILTER1
30180
r/w
Sets the signal filter of channel1.
SPC_FILTER2
30280
r/w
Sets the signal filter of channel2.
SPC_FILTER3
30380
r/w
Sets the signal filter of channel3.
0
No filter is used on the corresponding channel.
1
Filter 1 is used on the corresponding channel. The type of filter depends on the type of board and is shown below.
2
Filter 2 is used on the corresponding channel. The type of filter depends on the type of board and is shown below.
3
Filter 3 is used on the corresponding channel. The type of filter depends on the type of board and is shown below.
Filter
Specifications
MI.6110
MI.6111
filter 0
No filter will be used.
filter 1
-3 dB bandwidth
25 MHz
filter 2
-3 dB bandwidth
5 MHz
filter 3
-3 dB bandwidth
500 kHz