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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 25mm (Optional 35mm),Powering transmitting side : Inductive
TEL1-PCM-IND
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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