Unique Solutions for Clinical And Research Applications - Biometrics Ltd
K800 Amplifier
A modern microprocessor controlled general purpose amplifier system which is designed to be worn by the subject.
The K800 provides a user friendly method for collecting signals from a variety of sensors including goniometers, sEMG and related signals, in a format which may readily be connected to proprietary display and recording systems including A/D cards.
-
Easy to use general purpose precision amplifier - 8 analog channels
- 5 digital channels
- +5V built in power supply
- Accepts all Biometrics Ltd sensors
- Accepts other sensors including load cells
- Real time display for all channels in engineering units
- RS422 digital data transfer from Subject Unit to Base Unit
The K800 is a precision amplifier designed to provide the researcher with complete ease of use. Any combination of sensors may be connected to the small Subject Unit which is connected using a 6m cable to the larger Base Unit. All Biometrics Ltd sensors are easily connected with the analogue output voltages standardised in the range +0 to +4 Vdc. The LCD and 2 button switches act as the interface to configure the individual channels for the type of sensor attached. This enables any combination of sensors to be attached. The analogue output is via a single cable (R2000i) with flying wires allowing interface to a wide range of analogue data recording systems.
The sensors are categorised into 2 groups:
- Differential output bridge type sensors including:
- Biometrics’ Goniometers, Torsiometers, Hand Dynamometer, Pinchmeter
- Single ended high level sensors including:
- Biometrics’ sEMG pre amplifier, 3 axis accelerometer
K800 Sensors
K800 Accessories
EVENT MARKER IS3
A 1.8 metre cable with a suitable connector at one end to connect to the K800 Subject Unit, and a hand held switch on the other. This useful accessory allows time marks to be added to the data and enables the operator to highlight specific events during data collection.
CONTACT SWITCH ASSEMBLY FS4
An assembly of 4 Force Sensing Resistor Sensors (FSRs) each on 1.2 meters of cable which are readily connected to the K800 via one connector for use as switches to indicate contact e.g. heel and toe strike or palmer contact. The sensors are thin and robust and are usually placed inside the subject’s shoe or glove for convenience.
ANALOG OUTPUT CABLE WITH BNC CONNECTORS R2000iBNC
The optional addition of BNC connectors to the standard output cable R2000i provided with the K800. The 8 BNC connectors attach to a range of proprietary AD boards allowing real-time analogue data transfer of up to 8 channels per K800 unit directly into other hardware for synchronization with other inputs - for example integrating surface EMG measurements collected by the K800 into video motion capture systems.
Specifications
| Model | K800 | |
| MECHANICAL | Subject Unit | Base Unit |
| Dimensions | 100 x 50 x 25 mm | 180 x 170 x 48 mm |
| Mass | 150 g | 550 g |
| ELECTRICAL | Mains powered rated continuous | |
| Analog channels | 8 | |
| Digital channels | 5 | |
| Subject Unit | microprocessor controlled | |
| Base Unit | microprocessor controlled | |
| Communication from Subject Unit to Base Unit | RS422 | |
| Input voltage differential bridge mode | ± 12mV | |
| Input voltage single ended high level mode | ± 4V | |
| Output (full scale) | Analog +0.0 to +4.0 V | |
| Analog channel input impedance | 1M Ohm | |
| Power supply per channel | + 5.0 V dc | |
| Power supply per channel tolerance | ± 1 % | |
| Accuracy | better than ± 0.5 % full scale | |
| Maximum Common Mode | +3.5 V to -2.5 V | |
| Bandwidth General | 5 Khz | |