The Unit...
Brand: Smith Industries
PN: WL101EED3
Some insights...
Top picture:
From right:
From bottom:
From left:
Face:
Some mechanics:
How this works...
This instrument needs only a DC power supply between 24V and 28V, and it expects pulse signal where the frequency of this signal will be proportional to the engine rotating speed.
This unit, I guess, works with a magnetic pick up sensor.
A magnetic pickup is essentially a coil wound around a permanently magnetized probe. When discrete ferromagnetic objects (such as gear teeth, turbine rotor blades, slotted discs, or shafts with keyways) are passed through the probe's magnetic field, the flux density is modulated. This induces AC voltages in the coil. One complete cycle of voltage is generated for each object passed.
This is why the instrument has a differential input to measure the pulses.
When the sensor coil is "open" (this means broken) the instruments shutdown the LED display indicating a failure.
Normal operation with the N1 limit bug in manual mode:
Normal operation with N1 limit bug as an external signal (here in zero):
The dashed display indicates that the N1 limit has not been configured yet.
During the BITE test:
Applying some pulses...
I just have a very simple pulse generator and I'm applying a range of frequencies between 90 Hz and 2.78 KHz.
sweet! Good job man, Loved those gauges, used to work on them. where did you find the N1/2's
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