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Digital one channel telemetry system for strain gage applications on rotating shafts “Controlled Gain and AZ at receiver side” ,Signal bandwidth up to 1200Hz (-3dB),Distance <-> transmitting coil to receiving head 25 mm (Optional 35mm),Powering transmitting side : Inductive
TEL1-PCM
Digital telemetry system for strain gage applications on rotating shafts
“Controlled Gain and AZ at receiver side”
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Easy to assemble
and operate!
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Strain gage
sensors >350 Ohm
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Full- and half
bridge configuration
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Excitation fixed
4 Volt DC
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Auto-Zero
adjustment
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Gain: 250-500-1000-2000-4000-8000
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External shunt
calibration |
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Digital
transmission via magnetic field
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Distance up to
25mm, Optional 35mm
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No influence
through radio frequency
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Many systems can
operated at same time
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Signal bandwidth
0…1200Hz (-3dB)
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Output +/-10V and
digital for interface
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System accuracy
+/-0.2% |
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General Description
The TEL1-PCM single-channel telemetry system offers the easiest handling for
the wireless transmission of strain gage signals from rotating shafts. The
very small encoder 35 x 18 x 12 mm with a weight of 13g. The transmitter
(encoder) part is simply mounted on the rotating shaft with a special fiber
reinforced tape. Powering of the transmission part and the digital data
transfer between transmitter and receiver is realized inductively.
Functional Description
The TEL1-PCM transmitter provides
a pulse code modulated signal (PCM) to an induction winding around the shaft
(max. diameter 500mm, other on request!). The magnetic field of this winding
enables the inductive transmission of the signal to the pickup coil. From
there the signal is transferred by cable (5 m) to the receiver. The maximum
distance between the transmitter coil and the pickup is 25mm. (with standard
head)
The receiver unit offers a BNC connector at the
front panel with analog outputs ± 10 V and a optional a digital output for
PCM interface ECIA100 (for notebooks) or IF16 (PCI Desktop). An LED bar
indicator shows the actual level and a successful Auto Zero calibration.
Overload is indicated by the last LED´s in pos. or neg. direction of the bar
graph. These OVL-LED´s operate in peak-hold mode and are reset by pressing
the overload switch.
Strain gage sensors (>350 Ohm) in full- and
half- bridge configuration can be directly connected to the transmitter. The
excitation is fixed to 4 Volt DC and the gain is set by the gain switch on
the receiver side. An auto-zero (AZ) adjustment is executed by pressing the
AZ button on the front side of the receiver. The successful AZ operation is
indicated by a yellow LED in the middle of the LED bar indicator. When the
AZ completes the LED continuously illuminates. A continued flashing of the
yellow LED indicates some error in the AZ electronics. In this case please
contact the support of KMT. Additional to the AZ you have the possibility to
calibrate the bridge by external shunt. (+ and -). The AZ setting is stored
in a Flash-RAM and thus is not lost during power-off. Use only shielded
sensor cable. |
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TEL1-PCM-STG - "Transmitting part"
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TEL1-PCM-DEC - "Receiver and Decoder"
Front Side
Rear Side |
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4 (8) Channel wheel telemetry system for connection with strain gages, force, temperature and vibration sensors as well as high level input +/-5 or +/-10Volts.
· 4 different carrier frequencies (433.3, 433.7, 434.1 or 434.5 MHz) enable measurements
at 4 Wheels for one car.
· A mixed installation of different signal conditioning modules possible.
· Universal mounting adapter enables a fast and exactly montage on different
kind of wheels.
· The transmitting system is dust and water protected (IP65)
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CT4/8-Wheel
4/8
Channel Wheel Telemetry System
Including
signal conditioning for STG, Th K, ICP, POT or high-level inputs |
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STG offset via
potentiometer or optional Auto Zero calibration  |
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Output analog (+/- 5V) and digital for PC
interface at the receiver side |
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12 bit ADC resolution, simultaneous
sampling of all channels |
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Universal mounting adapter for fast and
exactly montage on the wheel |
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Signal bandwidth:
4 x 0-190 Hz, 8 x 95 Hz with 40kbit Tx
4 x 0-1500 Hz, 8 x 750 Hz with 320kbit Tx
4 x 0-3000 Hz, 8 x 1500 Hz with 640kbit Tx |
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4 different carrier frequencies (only
with 40kbit Tx) enable measurements at 4 Wheels for one car |
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Water protected housing (IP65) |
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Accumulator powered (up to 6-12h) |
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CT4/8-Wheel is an telemetry system designed for easy mounting onto
rotating Wheels to provide non-contact transmission of measured parameters
such as pressure, force, temperature, acceleration and voltage.
Sensors
inputs are connected via screw on, waterproof connectors. Measured values
are prepared in analog format, digitized and transmitted via radio
frequencies. Four different carrier frequencies are provided, this allows
up to four systems (e.g. for four wheels) to operate in parallel. The
complete transmitter assembly is waterproofed to IP65 specifications.
The
following sensors can be connected to the system: (STG) Strain gages
sensors in full-, half- and quarter-bridge configuration (350 ohm or
greater), Type K Thermocouples to 1000°C, ICP and capacitive sensors.
Voltage inputs of +/-5V and +/-10V are available.
The
measured values are processed and output as +/-5V analog signals at the
BNC sockets (optional digital output for special PCM interface into a PC)
on the stationary receiver located in a vehicle or helicopter cabin.
Resolution of 12 bits is standard; this enables an amplitude dynamic of 72
dB. The analog signal bandwidth is 0-95 Hz (-6dB) when configured as an
eight channel unit. The measurement accuracy is +/-0.5 % (without sensor).
The CT4/8-Wheel is suited for operation at ambient temperatures of -20 to
+70°C. The transmission distance between transmitter and receiving antenna
is of the order of 10m (30 feet) - depend of application! |
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Picture shows a CT4-Wheel Telemetry system with
standard accessories
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Offers a discerning solution for automotive RPM measurement without an additional sensor. Independent of vehicle and engine type, No sensor installation required,
Direct reading of RPM via LCD, Wide dynamic range, Analoge and digital output,
Small, lightweight, convenient, Simple and accurate calibration through one time press the button, Universal 12 - 42Vdc supply.
RPM-8000-PRO
Offers a discerning
solution for automotive RPM measurement
without an additional sensor |
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- Independent of vehicle and engine type
- No sensor installation required
- Direct reading of RPM
- Wide dynamic range
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- Analoge and digital output signals
- Small, lightweight, convenient
- Simple and accurate calibration
- Universal 12 - 42Vdc supply
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RPM-8000-PRO offers a discerning solution for
automotive RPM measurement without an additional sensor: the practical
instrument is simply connected via a standard jack to the cigarette
lighter socket and the RPM is shown directly on the LCD display. You even
have the choice to output the data as an analog voltage (1 Volt per 1000
rev/min) or as a digital pulse sequence (TTL). The smart measuring
principle is based on an analysis of the ripple balance of the supply
system, characteristic for all automotive alternators. The frequency of
this ripple amounts to about 100 to 120 pulses per engine rotation and
therefore delivers good dynamic measuring results.
Though the frequency is proportional to the
engine RPM, it also depends on the gear transmission ratio from crankshaft/alternators
and on the number of alternators poles and phases. This makes the
calibration of the input signal to the actual measured RPM necessary. The
latest version of the RPM-8000-PRO now offers two elegant options:
• Internal calibration: The internal
calibration assumes a steady engine RPM of 2000 rev/min, which can be
monitored by the automotive tachometer. By pushing the “Cal. Int” button
the calibration starts, whereby the instrument assigns the actual measured
pulse frequency to speed “2000” and outputs the actual engine RPM to the
LCD display.
• External calibration (option): A laser
RPM ”RPM-LASER-CAL” is needed for this option. A reflector tag is mounted
on the crankshaft and scanned by laser beam. The TTL output of the laser
instrument is connected via cable to the “Ext. Cal In.” input of the
RPM-8000-PRO and delivers one pulse per rotation. By comparing the pulse
sequence with the measured pulse frequency, the instrument calculates
automatically the relationship between ripple balance and speed. Identical
displays on laser and RPM-8000-PRO signal successful calibration (also
shown by luminescent LED’s).
The measuring range of the analog output
can be varied on demand via jumpers (e.g. to 0.5, 1.0 or 2.0 Volt per 1000
rev/min). The TTL output can also be scaled with a frequency factor of 1:8
or 1:16 – and therefore adapted to the resolution ability of attached
measuring systems. For testing purposes this “factor” between speed and
TTL frequency can be output, instead of the speed, to the LCD display by
pushing the “TTL” button. The instrument saves the calculated calibration
data in non-volatile memory until the next calibration.
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For more information see PDF data
sheet
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