Tach Signal From A Keyphasor - Commtest Instruments vb Series Instrument Reference Manual

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
®
tach cables can
with pre-existing speed measurements. Keyphasor
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.
26 Section 2: Basic Operation
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