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1 0 TECHNICAL MANUAL INSTRUMENT CALIBRATION PROCEDURE TORQUE ANALYZER MOUNTZ, INC. ETA MK V N THIS PUBLICATION SUPERSEDES NAVAIR 17 20MU 40 DATED 1 AUGUST 1989 DISTRIBUTION STATEMENT C. DISTRIBUTION AUTHORIZED TO U.S. GOVERNMENT AGENCIES AND THEIR CONTRACTORS TO PROTECT PUBLICATIONS REQUIRED FOR OFFICIAL USE OR FOR ADMINISTRATIVE OR OPERATIONAL PURPOSES ONLY. OTHER REQUESTS FOR THIS DOCUMENT SHALL BE REFERRED TO MEA- SUREMENT SCIENCE DIRECTORATE, NAVAL WARFARE ASSESSMENT DIVISION, P.O. BOX 5000, CORONA, CA DESTRUCTION NOTICE FOR UNCLASSIFIED, LIMITED DOCUMENTS, DESTROY BY ANY METHOD THAT WILL PREVENT DISCLOSURE OF CONTENTS OR "RECONSTRUCTION OF THE DOCUMENT. PUBLISHED BY DIRECTION OF COMMANDER NAVAL AIR SYSTEMS COMMAND 1 SEPTEMBER 1991

2 LIST OF EFFECTIVE PAGES Insert latest changed pages ; dispose of superseded pages in accordance with applicable regulations. NOTE : On a changed page, the portion of the text affected by the latest change is indicated change symbol, in the outer margin of the page. by a vertical line, or other Page No. Change No. * Change Date Page No. Change No. * Change Date Title 0 A 0 i 0 1 to 8 0 A 1 0 * Zero in this column indicates an original page. A

3 TABLE OF CONTENTS Section Page 1 Introduction and Description 1 2 Equipment Requirements 1 3 Preliminary Operations 2 4 Calibration Process Lb In Transducer Calibration Lb In Transducer Calibration 5 Navy Calibration Checklist 7 Appendix A: Gravity Correction Factor Vs. Latitude and Elevation A 1 TABLES Table Page 1 Calibration Description 1 i

4 SECTION 1 INTRODUCTION AND DESCRIPTION 1.1 This procedure describes the calibration of the Mountz, Inc. ETA MK V Torque Analyzer, including the BT 120I-V and BT 600I-V Transducers. The instrument being calibrated is referred to herein as the TI (Test Instrument). 1.2 All comments concerning this procedure should be directed to Measurement Science Directorate, Naval Warfare Assessment Division, P.O. Box 5000, Corona, CA This procedure includes tests of essential performance parameters only. Any malfunction noticed during calibration, whether specifically tested for or not, should be corrected. TI Characteristics Table 1. Calibration Description Performance Specifications Test Method Torque indication Ranges : 12 to 20 lb-in and Compared to torque 60 to 600 lb-in generated by Class C Tolerance: ±(2% iv ± 1 digit), weights applied at a 10 to 20% fs, known distance from ±(0.25% fs or 1.0% iv, whichever the fulcrum is less ± 1 digit), 20 to 100% fs SECTION 2 EQUIPMENT REQUIREMENTS NOTE Minimum use specifications are the principal parameters required for performance of the calibration, and are included to assist in the selection of alternate equipment, which may be used at the discretion of the using laboratory. Satisfactory performance of alternate items shall be verified prior to use. All applicable equipment must bear evidence of current calibration. The instruments utilized in this procedure were selected from those known to be available at Navy calibration facilities, and the listing by make or model number carries no implication of preference, recommendation, or approval for use by other agencies. It is recognized that equivalent equipment produced by other manufacturers may be capable of equally satisfactory performance in this procedure. 1

5 Minimum Use Calibration Item Specifications Equipment 2.1 Torque standard, including wheel, weight holders and weights 2.2 Torque standard, including lever arm and weight holder 2.3 Weight Set 2.4 Adapter 2.5 Sleeve adapter Value : 160 oz-in (10 lb-in) Uncertainty : ±0.1% iv Range : 20 lb-in to 600 lb-in Uncertainty : ±0.1% iv Range : 0.5 to 60 lbs Uncertainty : Class C 1/4 Msq - 1/4 M Hex 1/4 Fsq - 1/2 Msq, with 1/4 stock Torque Controls, Inc. CTP 500Z ; or Consolidated Devices, Inc. D-301 Torque Controls, Inc. CTS 2000P Metrology Engineering Center D-77 Dresser Local supply Torque Controls Local supply 2.6 Plug connector 2.7 C Clamps (2 ea) 1/2 Msq - 1/2 Msq To secure TI transducer to bench J. H. Williams S-150A Local supply Local supply SECTION 3 PRELIMINARY OPERATIONS 3.1 Ensure that the TI is clean and that it is free from defects that would impair its operation. 3.2 Compute the NOMINAL VALUE, N, lb-in, at each calibration point listed in column 2 on the checklist, as applicable, to the TI Transducer system to be calibrated, according to the following equation : where N = Normal torque, lb-in, corrected for local gravity and actual wheel or lever arm radius gl = gs = r = local gravity, gals standard gravity, gals effective radius of wheel or lever arm, in., from Report of Calibration m ~ mass of weight holder and applied weights 2

6 NOTES If the local gravity correction factor, gl/gs, is unknown, an approximate value can be determined from the graph in Appendix A. If gram weights are used to generate 10 pounds of force, convert the mass of the weights and weight holder (1600g) to lbs by multiplying by For example, if gl = gals, r = in. and m = 1600g, then N = ( ). ( )., or N = lb-in. 3.3 Secure the TI Transducer being calibrated to a bench with two C-clamps (item 2.7). 3.4 Connect the TI Plug In Control Module to the Digital Readout Unit receptacle at the rear of the Unit. 3.5 Insert the Plug In Control Module into the slot at the rear of the TI Transducer. Ensure that the Module is fully engaged, tighten the thumb screw securely. 3.6 Set the TI Digital Unit Power Source Selector switch to BATT. NOTE Adequate battery power and proper functioning of the LED display is indicated by an initial display of for approximately two seconds, followed by an indication close to zero. The internal batteries may be charged by connecting the unit to an AC power source and setting the power switch to AC ; the green BATTERY STATUS light will go out when the TI is fully charged. 3.7 Set the TI Digital Unit Power Source Selector switch to OFF ; connect the AC power cord to a 115 V ac, 60 Hz power source. 3.8 Set the TI Digital Unit RANGE Code Selector switch to position B if calibrating the BT 120I-V, lb-in Transducer or the BT-600I-V, lb-in Transducer. Ensure that the Plug In Module IMPACT-NORMAL switch is set to NORMAL. 3.9 Mount the 10 inch level arm (p/o item 2.2) on the TI Transducer shaft, using the appropriate adapter (item 2.5 or 2.6) Set the TI Digital Unit Mode Selector switch to ENTER-MEMORY and the Power Source Selector switch to A/C. NOTE Allow TI to thermally stabilize for at least 20 minutes Test the TI memory function as follows : Apply a small amount of torque manually to the lever arm, activating the Digital Unit COMMAND switch momentarily to enter the applied torque in the TI CHANNEL 1 memory Set the Digital Unit Mode Selector switch to RECALL-MEMORY, then activate the lower COMMAND switch as often as required to recall the stored value in CHANNEL 1 and display it. 3

7 Ensure that the channel is cleared of the stored value when the red CLR button is depressed Adjust the TI Transducer system for zero and span as follows : Set the Digital Unit Mode Selector switch to RUN Adjust the Plug In Module ZERO control to obtain a zero indication on the TI digital display Activate the Module Calibration Toggle switch ; adjust the SPAN control to obtain an indication on the TI digital display equal to the SPAN SETTING value, then release the Toggle switch. NOTE The SPAN SETTING value is printed on the MARK V Transducer Apply the weight holder (p/o item 2.2) and torque weights (item 2.3) to generate the torque equal to the full range of the Transducer being calibrated. Remove the weights Perform step 3.13 three more times, completing the TI Transducer exercises. SECTION 4 CALIBRATION PROCESS NOTE Unless otherwise specified, verify the results of each test and take corrective test requirement is not met, before proceeding. action whenever the LB IN TRANSDUCER CALIBRATION Ensure that the nominal torque values have been calculated, and that the TI Transducer has been secured to the bench and exercised per steps 3.2 through Remove the 10 inch lever arm and mount the inch wheel (p/o item 2.1) on the TI Transducer shaft, using an adapter (item 2.4) Ensure that the TI Digital Unit RANGE Code Selector switch is set to B, the Mode Selector switch is set to RUN, and the Plug In Module IMPACT NORMAL switch is set to NORMAL Adjust the TI Transducer system for zero and span as follows : Adjust the Plug In Module ZERO control to obtain a zero indication on the TI digital display Activate the Plug In Module Calibration Toggle switch, adjust the SPAN control to obtain an indication on the TI digital display equal to the SPAN SETTING value, then release the Toggle switch. 4

8 NOTE The SPAN SETTING value is printed on the MARK V Transducer Place the weight holder and appropriate torque weights (p/o item 2.1) on the wheel to apply the nominal value of torque in the cw direction at the first calibration point, 12 lb in. Refer to step 3.2 for proper weight selection Verify that the TI digital display indicates within the tolerance limits listed in the table below. Calibration Point Tolerance Limits Calibration Point Tolerance Limits 12 lb in +0.3 lb in 70 lb in +0.4 lb in Remove the weights, weight holder, wheel and adapter from the TI Transducer shaft. Mount the 10 inch lever arm on the shaft, using an adapter (item 2.5) Perform a measurement as follows at each remaining cw torque calibration point : Place the weight holder and the appropriate weight(s) on the lever arm to apply the nominal value of torque Verify that the TI indicates within the tolerance limits listed in the table Remove the weights, weight holder, lever arm and adapter from the TI Transducer shaft Disconnect the lb in Transducer from the calibration setup LB IN TRANSDUCER CALIBRATION Ensure that the nominal torque values have been calculated, and that the TI Transducer has been secured to the bench and exercised per steps 3.2 through Ensure that the 10 inch lever arm is mounted on the TI Transducer shaft, using an adapter (item 2.6) Ensure that the TI Digital Unit RANGE Code Selector switch is set to B, the Mode Selector switch is set to RUN, and the Plug In Module IMPACT NORMAL switch is set to NORMAL Adjust the TI Transducer system for zero and span as described in step Perform a measurement as follows at each calibration point listed in the table below. 5

9 Place the weight holder and the appropriate weight(s) on the lever arm to apply the nominal value of torque. Refer to step 3.2 for proper weight selection. Calibration Point Tolerance Limits Calibration Point Tolerance Limits 60 lb in +1.3 lb in 360 lb in +1.6 lb in Verify that the TI indicates within the tolerance limits listed in the table Affix a special calibration label and tag stating : "This instrument calibrated in cw direction, normal mode of operation only If no other measurements are to be performed, disconnect and secure the equipment. 6

10 CALIBRATION CHECKLIST TEST INST (S) Mountz, Inc. ETA MK V Torque Analyzer PROC. N O. PROCEDURE STEP NO. (1) NA 17 20MU 04 MFG. MODEL S ER. N O. FUNCTION TESTED (2) NOMINAL (3) MEASURED VALUES FIRST RUN SECOND RUN (4) (5) OUT OF TOL (6) CALIBRATION TOLERANCES (7) 3.1 TI Inspection ck ( ) NA 3.6 TI Battery ck ( ) NA 3.11 TI Memory & Recall ck ( ) NA 3.13 TI Exercise lb in Transducer ck ( ) lb in Transducer ck ( ) lb in Transducer Calibration Cal Pt. (lb in) (lb in) (lb in) lb in lb in Transducer Calibration Cal Pt. (lb in) (lb in) (lb in) lb in Page 1 of 2 7

11 CALIBRATION CHECKLIST TEST INST (S) Mountz, Inc. ETA MK V Torque Analyzer PROC. N O. PROCEDURE STEP NO. (1) NA 17-20MU-40 MFG. MODEL S ER. N O. MEASURED VALUES OUT FUNCTION TESTED NOMINAL FIRST RUN SECOND RUN OF TOL CALIBRATION TOLERANCES (2) (3) (4) (5) (6) (7) Cal. Pt. (lb-in) (lb-in) lb-in Page 2 of 2

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