Humboldt H-1322B Marshall and TSR Compression Machine - Manual (Page 8)

Using a ½" hex socket on a 3 /
8
" drive ratchet, connect to the
internal male hex shaft and crank counter clockwise to raise the
platen and apply load to the reference gage and the machine’s
load cell .
Starting from the chart origin, observe the recorder's pen position
and check it against the reference gage reading for each 1000 lbf
of load applied .
If an adjustment other than a zero shift is needed, remove the
recorder from the chassis leaving the cables connected and from
the picture below find potentiometer R231 (for the Y axis) . With
a small, plastic screw driver turn the pot to increase or decrease
the gain as required .
Calibration of the Flow or X axis is accomplished by measuring the platen
travel with a rule while keeping time with a stop watch (usually 1 /
2
" in 15
seconds is the measured distance and time check) while observing the chart
reading . If the travel is not within .50" +/- .04" on the chart adjust the gain
using pot R131 .
Maintenance
The machine and transducers should be kept clean and the machine should not be
over lubricated . Light oiling with synthetic instrument oil at most is required on
exposed spindles and threads; the jack and gear box are serviced with a premium
wheel bearing grease such as Pennzoil 707L Lubriplate Grease applied thru the
grease fitting no more than annually, or when an indication of power train friction
appears .
R231
R131
Top End
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