Humboldt H-4140 GeoGauge - Manual (Page 35)

35
Humboldt GeoGauge ® Verifier Mass Guide
For use with C series Humboldt GeoGauge
Purpose
To verify or check the operation of the C series Humboldt H-4140 GeoGauge by
running a measurement on top of the Verifier Mass. It is not intended to
calibrate the GeoGauge.
Equipment Required
H-4140.20 Verifier Mass Assembly (10 kg with installed rubber isolation mounts)
Operation
1) Place the Verifier Mass Assembly on a relative flat and rigid surface. The
surface at this location should be approximately level. A concrete floor that
is generally crack-free and well supported is ideal.
2) Wipe clean the ring foot at the bottom of the GeoGauge. Clean the
v-groove around the seal between the foot and gauge body. Inspect the
ring foot surface for deep gouges, nicks, protrusions or raised nicks. The
ring foot should be relatively flat. Remove excessive protrusions or raised
nicks by setting the GeoGauge on a flat abrasion sheet placed on a flat steel
plate. Rotate the GeoGauge via its handle 2 – 3 times until the protrusions
are approximately flat with the ring foot surface. Wipe off the abrasion dust
from the ring foot.
3) Turn on GeoGauge. Set the GeoGauge to display stiffness in
S.I. (metric) units.
4) Smear a small amount of any lubricating oil on the shoulder of
the Verifier Mass.
5) Gently set the GeoGauge’s ring foot in position over the shoulder of
the Verifier Mass.
6) Rotate the gauge on the mass a random amount.
7) Firmly press the MEAS button to make a measurement of the
Verifier Mass stiffness.
8) After 75 seconds the measured stiffness will be displayed. Record
the stiffness.
9) Remove the GeoGauge from the Verifier Mass. Reset it back onto the
Verifier Mass. When repeating measurements, it is important to remove
the GeoGauge from the Verifier Mass between measurements to account for
placement and operator bias. Place the GeoGauge on the Verifier at different
rotational orientation each time.