|2 channel mini rack||16 channels in 19" rack
rack can take up to 36 channels
The Kemo CardMaster 21.2 is a filter card designed for fixed frequency filtering applications requiring fixed settings or occasional adjustment of cut-off frequency. CardMaster 21.2 is a member of the Series 21 family of signal conditioning components and can be used in mixed systems comprising different cards from the Series 21 filters.
Up to 18 CardMaster 21.2's can be fitted to the Kemo 21.18 3U 19" rack, or 1 card in the 21.1 minirack as shown above.
The CardMaster 21.2 replaces several older Kemo filter cards and uses the 1200 or 1600 Series filter modules to provide a flexible solution for fixed frequency applications. CardMaster 21.2 systems are usually supplied fitted in a rack, configured and tested to your requirements. For low channel count systems,<8 channels, it may be worth looking at the DIN Rail filters.
|Channels||2 per card - common zero volt|
|Control||On board switches or selectable components|
|Frequency||Semi-fixed, user specified|
|Gain||0 - +60dB, with output attenuation|
|Filters||1200 and 1600 series filter modules|
|Filter Responses||Defined by filter modules|
|Input Coupling||AC / DC, Single ended/differential|
|IEPE||1 - 10mA 24V selectable|
|Size||1 Series 21 slot (100x220mm Eurocard)|
|Racks, Size and Weight||21.18 Rack(19") - up to 36 channels, 420 x 155 x 350mm (16.6 x 6.1 x 13.8"), 11 kg, (24 lb) maximum.
21.5 Rack - up to 10 channels, 153 x 155 x 350mm (6 x 6.1 x 13.8"), 3.6 kg (8 lb) maximum. Special order
21.1 Minirack - up to 2 channels, 44 x 116 x 270 mm (1.7 x 4.6 x 10.7") 1 kg ( 2.2 lb) maximum.
|Power||21.18 rack 90 -120/180-240 Vac 50/60Hz - Optional DC power
21.1 minirack 9 - 30V DC power
When fitted with Kemo 1200 Series filter modules the cut-off frequency of a CardMaster 21.2 can be be set to 3 values. fca, fcb, and fc a+b, selected by switches on the CardMaster 21.2. (These cut-off's are usually factory set, however full instructions are included for the user to change these)
When fitted with Kemo 1600 Series filter modules the cut-off frequency can be set by on board dip switch to give 255 steps of filter cut-off. ( Note 1600W filter modules are not recommended for use on CardMaster 21.2)
Inputs and Gain
From our experience of signal filtering we have included a versatile set of input configurations and gain on the CardMaster 21.2. Each channel can be independently configured.
Inputs - AC or DC coupling, set by on board switches.
Input Mode - Single ended or differential, set by on board switches.
Transducer Power - current source for IEPE transducers, 24V 1-10 mA, set by user selectable resistor.
Input Gain - up to + 60dB. Set by single on board resistor. Kemo use industry standard top quality instrumentation amplifiers.
Trims - Gain and DC offset can be trimmed by multi-turn pots on the board.
Output attenuation - if required the output can be passively attenuated.
In some cases, for bandpass filtering, the two channels can be internally connected in series.
DC power, 9-30V DC input is available as an option for the 21.18 racks, with an AC 'power brick' to power the unit from mains when available. Please check our page about DC Power.