CI8 isolated voltage channels with current and temperature mode 285
imc CANSAS Users Manual - Doc. Version 1.9 - 05.12.2014© 2014 imc Meßsysteme GmbH
6.6 DAC8 analog outputs
8 analog outputs
configuration possibilities
voltage source
current source
each channel separately configurable
Technical data DAC8.
6.6.1 General notes DAC8
The imc CANSAS-DAC 8 module has 8 digital / analog converters (DAC, D/A converters). This type of
module's outputs can be configured as either voltage or current sources individual for every channel. The
voltage range is from -10 V to +10 V at a resolution of 16 bits. The current supply works in the range from
0 to 20 mA and has 15-bit resolution. The outputs' refresh frequency is 10 kHz.
The output signal can be governed either by CAN-message or by internal logic. The outputs' status upon
power-up is defined.
The 8 outputs have a common ground. Thus, they are not mutually isolated, but they are isolated from
the voltage supply and the CAN-bus.
6.6.2 Analog portion
In the DAC8 module, the D/A converter outputs are not directly connected to the terminal plug. Instead,
they are connected via a 2
nd
order Butterworth filter with a cutoff frequency of 5 kHz. This suppresses
"glitches" (typical spurious impulses experienced by D/A converters upon power-up) and the otherwise
very angular signal shape is rounded. A signal shape thus results which appears more natural and doesn't
display the otherwise typical staircase look. This also reduces the harmonics in the signal.
Additionally, there is a relay connected in front of each output. The relay only closes after the transients
in the D/A converter and the filter have subsided, which appear upon activation of the module.
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