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General Description
The TEL1-PCM-BATT single-channel
telemetry system offers the easiest handling for the wireless transmission
of strain gage signals from rotating shafts. The very small encoder is
available in two sizes. Housing1 = 70 x 18 x 8 mm (Standard) or housing2= 35
x 18 x 12 mm (on request). Each has a weight of 13g. The transmitter
(encoder) part is simply mounted on the rotating shaft with a special fiber
reinforced tape.
The data transfer between transmitter and receiver is digital. The powering
of the transmission part by the TEL1-PCM BATT is supplied by 6-9V battery.
Functional Description
The TEL1-PCM-BATT transmitter
provides a pulse code modulated signal (PCM) to an induction winding around
the shaft. The magnetic field of this winding enables the inductive
transmission of the signal from coil to pickup. From there the signal is
transferred by cable (5 m) to the receiver. The maximum distance between the
transmitter coil and the pickup is 150mm.
The receiver unit offers a BNC connector at the
front panel with analog outputs ± 10 V (on request 4-20mA) 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. The yellow
LED flashes as long as the AZ is in progress. 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. |
