Universal Calibrating Machine
(UCM) Manual
(PM-5201)
Morehouse Instrument Company, Inc.
1742 Sixth Ave., York, PA 17403-2675 USA
Phone: (717) 843-0081
www.mhforce.com
Page 24
Rev. 11/2021
tate the best position for individual requirements. A little practice in the use of this pump will enable extremely
precise force application by means of the pump and jack.
If the hand pump and hydraulic jack seem rather “spongy” during use there may be air in the system. If this
occurs the system will need to be bled of the entrapped air. The procedure for bleeding the entrapped air is
outlined in section 6.2.
Caution: Do not attempt to exceed the 1 inch stroke of the ram in the jack cylinder. Considerable damage may
result if pressure is applied after the ram has reached its limit of travel.
4.5 Universal Hydraulic Pump
An optional electric motor driven pump is available for use with calibrating machines with capacities of 60,000
lbf (250 kN) and higher. This unit is referred to as the Morehouse Universal Hydraulic Pump. The power control
replaces the hand pump, thus eliminating the effort required to operate the hand pump. To use the power
control please refer to the operating instructions supplied with it. For detailed information, see the
Hydraulic Pump Instruction Manual
.
4.6 Calibration
Once the reference standard and the test instrument have been installed into the universal calibrating machine
and the operator has become proficient in the use of the hand pump, calibration of the test instrument can be
performed.
Caution: Calibration of a test instrument should not be attempted until the personnel concerned are complete
-
ly familiar with operation of both the reference standard and the test instrument.
Detailed procedures for calibrating the various types of test instruments are beyond the scope of this manual.
In general, such calibration consists of applying a series of forces to the calibration system (by means of the
hand pump and jack assemblies) and comparing the indication of the calibration standard with that of the test
instrument.
Caution:
When applying forces, always monitor the force applied by the calibration standard. Never depend
on the indicated value of the test instrument to determine the applied force unless the accuracy of the test
instrument has been verified. There may be a significant error in the test instrument, which could cause the
reference standard and the calibrating machine to be overloaded and damaged.
