Cobra4
Cobra4 Sensor-Units
wireless
Cobra4 Sensor-Unit “Timer/Counter”
12651.00
The Cobra4 Sensor-Unit “Timer/Counter” is used for the time measurement of switching signals and signal levels of up to four fork-type light barriers or measuring microphone, motion sensor, falling sphere apparatus, or other devices with TTL-compatible signals. Device for external triggering can be also connected. This enables experiments concerning linear motion, including collision experiments with demonstration track, free fall experiments with picket fences or a falling sphere apparatus as well as the measurement of oscillations, rotational motion, and frequency measurements in acoustics. Connection to Cobra4 Wireless-Link, Cobra4 Mobile-Link, or Cobra4 USB-Link possible. Technical data: Power supply: via basic unit; in case of three or more light barriers, delivered use external power supply unit. Current consumption: < 300 mA Resolution: 1 microsecond Dimensions: approx. 62 mm x 110 mm x 35 mm Accessories for the Cobra4 Sensor-Unit Timer/Counter: 11207.20 Fork-type light barrier, compact (up to 4) 12651.01 Cobra4 adapter for Sensor-Unit “Timer/Counter” for connection of light barriers 03543.00 Measuring microphone with an amplifier 02502.88 Falling sphere apparatus 12004.10 Motion sensor with cable
Cobra4 Sensor-Unit “Electrophysiology: ECG, EMG, EOG”
The Cobra4 Sensor-Unit “Electrophysiology” is used for the electrophysiological measurements of the heart, eye, and muscle activity. The measuring electrodes are connected to 3.5-mm-sockets with colour assignment via three separate and shielded measurement leads. The unit can be connected to the Cobra4 Wireless-Link and to the Cobra4 USB-Link. Technical data: Signal filter: ECG filter: 0.03 Hz…100 Hz EMG filter: 80 Hz…5000 Hz EOG filter: 0.03 Hz…50 Hz Max. data throughput rate: 1 kHz Dimensions: approx. 62 mm x 110 mm x 35 mm Accessories for the Cobra4 Sensor-Unit “Electrophysiology”: 12673.01 Individual measurement leads, shielded, 3 pieces with colour coding (red, yellow, and green), with 3.5-mm TRS connectors for the connection to the Sensor-Unit and 2-mm-connectors for the connection to permanent and disposable electrodes 12673.02 Alligator clips for disposable electrodes, 3 pieces
Cobra4 Sensor-Unit “Weather: air pressure, humidity, temperature, light intensity, and altitude” Cobra4 Sensor-Unit “Force 4 N”, Cobra4 Sensor-Unit “Force 40 N”
12673.00
12670.00
The Cobra4 Sensor-Units “Force ± 4N and ± 40N” comprise a strain gauge that converts the mechanical load into an electrical signal. A weight holder plate can be fastened to the upper end of the housing in order to measure the weights that are put on the plate. The lower end of the device is equipped with a hook to attach the weights. The Cobra4 Sensor-Units “Force” are held at the top or at the bottom in a mechanically safe manner by a threaded rod with an M6 thread. The unit can be connected to the Cobra4 Wireless-Link, Cobra4 Mobile-Link, or Cobra4 USB-Link. Technical data: 12642.00 12643.00 Measuring range: -4 to +4 N -40 to +40 N Measuring accuracy: 0.2 mN 2 mN Max. data throughput rate: 16 Hz 16 Hz Dimensions: approx. 62 mm x 110 mm x 35 mm approx. 62 mm x 70 mm x 35 mm
The Cobra4 Sensor-Unit “Weather” can measure the following quantities simultaneously: air pressure, relative humidity, air temperature, light intensity, and altitude (based on the air pressure). The unit can be connected to the Cobra4 Wireless-Link, Cobra4 Mobile-Link, or Cobra4 USB-Link. Technical data: Air pressure Temperature Measuring range: 10 to 1100 hPa -40 to +125°C Accuracy: ± 1.5 hPa ± 0.5°C Relative humidity Light intensity Measuring range: 0 to 100% 0 to 10,000 lx Accuracy: ± 5% ± 5% Wavelength accuracy: 320…1050 nm Max. data throughput rate: 5 Hz Dimensions: approx. 62 mm x 70 mm x 35 mm
12642.00 12643.00
Cobra4 Display-Connect
Cobra4 Sensor-Unit “Force ±4 N” Cobra4 Sensor-Unit “Force ±40 N”
Cobra4 Sensor-Unit “Electricity”, current/voltage, ± 6A, ± 30V
12644.00
Fuse-protected current and voltage sensor with 4-mm-sockets. The voltage and current inputs are galvanically isolated. The unit can be connected to the Cobra4 Wireless-Link, Cobra4 Mobile-Link, or Cobra4 USB-Link. Technical data: Current Voltage Measuring range: -6 to +6 A -30 to +30 V Resolution: 3 mA 15 mV Internal resistances: 1 MΩ 33 mΩ Max. data throughput rate: 140 kHz 140 kHz Dimensions: approx. 62 mm x 110 mm x 35 mm
Cobra4 Sensor-Unit Sensor-Unit “3D-Acceleration” “Acceleration, 3D acceleration, Cobra4 ± 2 g, ± 6 g ± 2 g, ± 6 g”
12650.00 12650.00
The Cobra4 Sensor-Unit “Acceleration” has internal acceleration sensors for the three directions in space (x, y, and z). The unit can be connected to the Cobra4 Wireless-Link, Cobra4 Mobile-Link, or Cobra4 USB-Link. Technical data: Measuring range 1 Measuring range 2 Measuring range: -2 g to +2 g -6 g to +6 g Resolution: 1 mg 5 mg Max. data throughput rate: 142 Hz 142 Hz Dimensions: approx. 62 mm x 63 mm x 35 mm
Cobra4 Sensor-Unit “Tesla”
12652.00
The Cobra4 Sensor-Unit “Tesla” is used to measure the magnetic field strength in DC and AC fields. The Hall probes for axial (13610.01) and tangential (13610.02) measurements are connected to the unit via a 5-pin diode connector. The unit can be used in combination with the Cobra4 Wireless-Link, Cobra4 Mobile-Link, or Cobra4 USB-Link. Technical data: Measuring ranges (resolution): ± 10 mT (10 μT) / ± 100 mT (100 μT ) / ± 1 T (1 mT) Compensation: ± 1 T in all of the measuring ranges Measuring accuracy: DC field: ± 2% / AC field: ± 5% AC field measurement: effective value (crest factor up to 5) / max. frequency: 1 kHz Max. data throughput rate: 5 Hz Dimensions: approx. 62 mm x 63 mm x 35 mm
Hall probes for the Cobra4 Sensor-Unit “Tesla” Axial Hall probe: Tangential Hall probe: 13610.01 13610.02
excellence in science
Hall probe on a tube probe with a handle; probe length/diameter: 300 mm/6 mm particularly flat Hall probe with a handle; dimensions of the probe carrier: (1.1 x 5.0 x 70) mm Hall probe, axial Hall probe, tangential
The Cobra4 Display-Connect set is a combination of a transmitter and receiver for the radio-based communication between a Cobra4 Mobile-Link (12620.55) and up to two digital large-scale displays (07157.93) with 5 selectable transmission channels and a carrier frequency of 433 MHz. With this set, the measurement data can be displayed in a clearly visible manner, even in large auditoriums, classrooms, or lecture halls. All you have to do is connect the transmission unit between a Cobra4 Sensor-Unit and the Cobra4 Mobile-Link and attach the reception unit of the Display-Connect to the input of the large-scale display. The transmitter and receiver are supplied with power via the devices to which they are connected. The measurement series can be recorded in parallel via the SD card of the Mobile-Link. Technical data: Receiver: Transmitter Connector: 9-pin Sub-D connector 15-pin Sub-D connector Channel switching: via a slide switch via the Mobile-Link software Power supply: via the Mobile-Link via the large-scale display Dimensions: approx. 43 x 21 x 112 mm approx. 69 x 57 x 72 mm Transmitting power: 10 mW Range: approx. 30...40 m without obstacles 12623.88 Cobra4 Display-Connect, set comprising a transmitter and a receiver for using the Cobra4 Mobile-Link with digital large-scale displays 12623.01 Cobra4 Display-Connect RX, receiver (for the digital large-scale display) 12623.00 Cobra4 Display-Connect TX, transmitter (for the Cobra4 Mobile-Link) 07157.93 Digital large-scale display, RS232 interface
SD memory card for the Cobra4 Mobile-Link, 2 GB, 20 MB/sec
12620.01
Commercially-available, fast SD memory card incl. transport case. Technical data: Type: SecureDigitalCard; manufacturer: SanDisk, Extreme III Storage capacity: 2048 MB Write/read speed: 20 MB/sec
Card reader for SD cards
12620.03
USB 2.0 single-slot card reader for SD and MMC cards up to 2 GB. Can be used without a driver under Windows ME, 2000, XP, Vista, and Mac OS 9.1, OS X. Reads and writes SecureDigital and MultiMedia cards. Technical data: Data transfer rate: up to 18.5 MB/s with SD cards (11 MB/s with MM cards)
Rechargeable metal hydride batteries and a charger for Cobra4 All of the Cobra3 units that require a power supply use rechargeable metal hydride batteries with low selfdischarge (type Mignon (AA), voltage 1.2 V, capacity 2000 mAh). They can be recharged quickly with the matching quick charger (for 4 rechargeable Mignon (AA) or Micro (AAA) batteries, adjustable charging current of 2100 mA or 850 mA, trickle charging). 07930.03 Rechargeable metal hydride battery, type Mignon (AA), 1.2 V, 2000 mAh, type Eneloop, pack of 4 07930.99 Quick charger for rechargeable metal hydride batteries, 100...240 V
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