Section 2: Basic Operation
26
Tach Signal from a Keyphasor®
If your machine has a proximity-probe based tachometer sensor (e.g.
Keyphasor
®
), this can be used as the tach signal for your vb
instrument. The sensor should have a buffered front-panel BNC
output, to ensure the vb instrument's measurements can’t interfere
with pre-existing speed measurements. Keyphasor
®
tach cables can
be purchased through your local Commtest reseller for this purpose.
The Keyphasor
®
proximity sensor gap should be adjusted so the
driver box output is -8 V +/- 2 V (i.e. -6 V to -10 V) when the sensor is
over the shaft. This is the normal mid-range position for these
sensors. When the sensor is over the keyway its output will be -14 V
to -22 V, depending on its make and model.
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