Filter cut-offs from 1 Hz to 127 kHz 254:1 adjustment of cut-off frequency Gain in 1,2,5, steps to x 500 (+54dB) Signal level indication Filter bypass Range of Standard Filter Responses 2 Rugged Racks, AC or Optional DC power  Single ended / Differential / IEPE inputs Computer Control options Input overload indication BNC inputs & outputs Usually ex-stock     CardMaster 21.255G pdf data sheet (32kB)

Click here for larger image (16 kB)

The Kemo CardMaster 21.255G is a filter card designed for applications requiring occasional adjustment of cut-off frequency and gain. Cut-off for each channel is set using two front panel hexadecimal rotary switches, and gain by two front panel switches. CardMaster 21.255G 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. 
Gain of 1, 2, 5, 10, 20, 50, 100, 200 and 500 is set by front panel switches. Input configuration is set by on board jumpers.
Up to 18 CardMaster 21.255G s can be fitted to the Kemo 21.18 rack, or 2 in the compact portable DC powered minirack.
The CardMaster 21.255G is based on the Kemo 1600 Series filter module, to provide a filtering solution for applications where filter cut-off frequencies need to changed. 

Summary Specification

Channels	1
Control	Filter cut-off and gain set by front panel switches. Other parameters by on board jumpers or selectable components External control option.
Frequency	254 cut-off steps, and filter bypass
Gain	1, 2,  5, 10, 20, 50, 100, 200, 500, with output attenuation
Filters	1600 series filter modules
Filter Responses	Defined by filter modules
Input Coupling	AC / DC, Single ended / differential set by internal jumpers
Input Overload	Absolute Input overload (single ended or differential)
IEPE	1 - 10mA 24V selectable current
Signal Level Indication	3 colour, 4 signal level, off / green / yellow / red
Size	1 Series 21 slot (100x220mm Eurocard)
Racks, Size and Weight	21.18 Rack(19") - up to 18 channels, 420 x 155 x 350mm (16.6 x 6.1 x 13.8"), 10 kg, (22 lb) maximum. 21.5 Rack - up to 5 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, 56 x 106 x 300 mm (2.2 x 4.2 x 11.8") 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

Frequency Range
The frequency range of a CardMaster 255G card is expressed in terms of its 'base frequency' ff; the card can be set to any frequency between ff and 255ff, in steps of ff. Cards can be ordered with base frequencies ranging from 1Hz to 500Hz on a 1/2/5 scale. We make the most appropriate combination from 1200 Series filter modules and controlling components.

Inputs and Gain
From our experience of signal filtering we have included a versatile set of input configurations and gain on the CardMaster 21.255G. Each channel can be independently configured.
Inputs - AC or DC coupling, set by on board jumpers.
Input Mode - Single ended or differential, set by on board jumpers. Note:- AC coupling is on both inputs of differential input. 
Transducer Power - current source for IEPE transducers, 24V 1-10 mA, set by user selectable resistor, default value 4 mA.
Input Gain - set on front panel, two switches, x1,x2,x5 and x1,x10,x100, to give 1,2,5 steps to x500.
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.

Signal Offset
CardMaster 21.255G cards are now fitted with additional offset on the output, up to +/- 5V offset can be applied to the signal output making them suitable for use with 0-5V  or similar unipolar data acquisition systems.

Control
CardMaster 21.255G cards are fitted with control logic compatible with the standard Kemo Series 21 interface for external computer control.

DC Power
DC power, 9-30V DC input is available as an option for Kemo 21.18 racks, with an AC 'power brick' to power the unit from mains when available. 
Please check our page about DC Power.

    CardMaster 21.255G pdf data sheet (32kB)