T.O. 33K6-4-1597-1

30 JULY 2009

TECHNICAL MANUAL

CALIBRATION PROCEDURE

FOR

ANGLESTAR UTILITY PROTRACTOR

GENERAL

This publication replaces T.O. 33K6-4-1597-1 dated 30 April 1999 and all subsequent changes.

Distribution Statement C - Distribution authorized to U. S. Government agencies and their contractors for official use or for administrative or operational purposes only, 30 August 1987. Requests for this document shall be referred to 562 CBSG/GBHA, 813 Irving-Wick Dr W, Heath, OH 43056-1199. Destruction Notice - For unclassified, limited documents, destroy by any method that will prevent disclosure of the contents or reconstruction of the document.

Published under Authority of the Secretary of the Air Force

T.O. 33K6-4-1597-1 INSERT LATEST CHANGED PAGES. DESTROY SUPERSEDED PAGES. NOTE: The portion of the text and illustrations affected by the changes is indicated by a vertical

line in the outer margins of the page. Date of issue for original and changed pages are: Original ...................... 0 ........................... 30 July 2009 TOTAL NUMBER OF PAGES IN THIS PUBLICATION IS 22, CONSISTING OF THE FOLLOWING: Page * Change Page * Change Page * Change No. No. No. No. No. No. Title ...................................0 A ........................................0 1 - 14 ..................................0 A-1 .....................................0 A-2 Blank ..........................0 B-1 - B-3 ............................0 B-4 Blank ...........................0

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LIST OF EFFECTIVE PAGES

A USAF

T.O. 33K6-4-1597-1

ANGLESTAR UTILITY PROTRACTOR

GENERAL

1 CALIBRATION DESCRIPTION:

Table 1. Test Instrument (TI) Performance Test Characteristics Specifications Method Angle Measurement Range: -45 to 45 Compared against an Indexing Table or Accuracy: -10 to 10, 0.1; Sine Plate -10 to -45, 10 to 45, 1.5% of ind rounded to next greater 0.1 * Range: -60 to 60 Accuracy: -50 to 50, 0.1; -50 to -60, 50 to 60, 0.3 Overrange Range: -45 to 45 Accuracy: indicates overrange between -50 to -60, 50 to 60 Range: -60 to 60 Accuracy: indicates overrange >-60, >60 Alternate Reference Range: -45 to 45 and Hold Calibration Accuracy: -10 to 10, 0.1; -10 to -45, 10 to 45, 1.5% of ind rounded to next greater 0.1 * Range: -60 to 60 Accuracy: -50 to 50, 0.1; -50 to -60, 50 to 60, 0.3 Independent Sensor Range: -45 to 45; -60 to 60 Accuracy: As recorded in Sample Worksheet 1 * See step 3.5

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2 EQUIPMENT REQUIREMENTS: Minimum Use Calibration Sub- Noun Specifications Equipment Item 2.1 SINE PLATE Range: 0 to 45 or 60 51D23054 10 INCH Accuracy: Angle, 30 arc-sec 2.2 GAGE BLOCKS *1 Range: N/A 28 Accuracy: 50 in from stated value 2.3 ANGLE BLOCKS *1 Range: N/A L.S. Starrett Co AG18TR Accuracy: 0.8 arc-sec from stated value 2.4 GAGE BLOCKS *1 Range: N/A 36 Accuracy: 50 in from stated value 2.5 GAGE BLOCKS *1 Range: N/A 8 Accuracy: 50 in from stated value 2.6 SURFACE Range: N/A Rahn PLATE GGG-P-463 Accuracy: N/A 2.7 MASTER Range: N/A L.S. Starrett Co LEVEL 199 Accuracy: Vial sensitivity of 30 arc-sec/div or better 2.8 INDEXING Range: 360 A.G. Davis AA Gage TABLE CD12 B Accuracy: Angle, 15 arc-sec 2.9 LEVELING Range: N/A AGMC *3 PLATE 8636110 Accuracy: N/A 2.10 RIGHT Range: 5 x 4 1/2 x 8 in Taft-Pierce ANGLE 9192 IRON *2 Accuracy: Adjacent sides square within 300 in/8 in See footnotes at end of Table.

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Minimum Use Calibration Sub- Noun Specifications Equipment Item 2.11 DC POWER Range: -12 to 12 VDC Hewlett-Packard SUPPLY *2 6200B Accuracy: -4, 3 VDC 2.12 DIGITAL Range: 0 to 100 VDC Hewlett-Packard MULTIMETER *2 3458A Accuracy: (10 ppm of ind + 0.3 ppm of range) 2.13 PARALLEL BARS Range: N/A As Available (2 EACH) Accuracy: N/A 2.14 CLAMPS Range: N/A As Available Accuracy: N/A 2.15 MODELING Range: N/A As Available CLAY Accuracy: N/A *1 Only for use in Alternate Method *2 Item required only to calibrate a TI Sensor without an angle display *3 Contact AFMETCAL Det 1 if item is not available 3 PRELIMINARY OPERATIONS: 3.1 Review and become familiar with entire procedure before beginning Calibration Process.

WARNING

Unless otherwise designated, and prior to beginning the Calibration Process, ensure that all test equipment voltage and/or current outputs are set to zero (0) or turned off, where applicable. Ensure that all equipment switches are set to the proper position before making connections or applying power.

3.2 Bring the TI into the calibration area 8 hours prior to beginning Calibration Process. 3.3 The temperature of the calibration area must be within 67 to 79 F and must not vary more than 2 F during the Calibration Process. 3.4 Use only that portion of the Calibration Process applicable to the TI being calibrated. 3.5 The rounding of the TI Accuracy Limits to the next greater 0.1 is required due to the TI resolution of 0.1 and does not require a Limited Certification Label for the TI. 3.6 Make a copy of Appendix A to use as a Worksheet.

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4 CALIBRATION PROCESS:

NOTE

There are two methods to perform the Calibration Process. The Preferred Method uses the Indexing Table and the Alternate Method uses the Sine Plate. If the TI fails any of the calibration tests, refer to Appendix B for adjustments. If calibrating an independent TI Sensor which does not have an angle display, perform only para 4.4.

NOTE

Unless otherwise specified, verify the results of each test and take corrective action whenever the test requirement is not met, before proceeding.

4.1 ANGLE MEASUREMENT CALIBRATION: (Preferred Method) 4.1.1 Setup the test equipment as shown in Figure 1 with the Master Level against the Parallel Bars. The Parallel Bars must be secured with Clamps or Modeling Clay to prevent movement. 4.1.2 Use the Master Level to level the Leveling Plate across its length to within 30 arc seconds. 4.1.3 Remove the Master Level from the Leveling Plate. 4.1.4 Place the TI on the Leveling Plate against the Parallel Bars.

LEVELING PLATE

SURFACE PLATE

00.0

TI (OR MASTER LEVEL)(CLAMPS/MODELINGCLAY NOT SHOWN)

PARALLEL BARS

Figure 1. 4.1.5 Set the TI to On and ensure the display is set for degrees. 4.1.6 The TI must indicate within the corresponding values listed in the Limits column of Table 2 for an applied angle of 0 for the TI being calibrated. 4.1.7 Rotate the TI 180 on the Leveling Plate to the same location against the Parallel Bars. The TI will remain right side up and face away from the technician.

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4.1.8 The TI must indicate within the corresponding values listed in the Limits column of Table 2 for an applied angle of 0 for the TI being calibrated.

Table 2. TI Range () Applied Angle () Limits () 45 0 -0.1 to 0.1 5 4.9 to 5.1 15 14.7 to 15.3 30 29.5 to 30.5 45 44.3 to 45.7 355 -4.9 to -5.1 345 -14.7 to -15.3 330 -29.5 to -30.5 315 -44.3 to -45.7 60 0 -0.1 to 0.1 5 4.9 to 5.1 15 14.9 to 15.1 30 29.9 to 30.1 45 44.9 to 45.1 59 58.7 to 59.3 355 -4.9 to -5.1 345 -14.9 to -15.1 330 -29.9 to -30.1 315 -44.9 to -45.1 301 -58.7 to -59.3 4.1.9 Remove the TI from the Leveling Plate. 4.1.10 Setup the test equipment as shown in Figure 2. Ensure the Indexing Table is set to 0.

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WARNING

To prevent serious injury to personnel, the counterweights on the CD12 Indexing Table must be adjusted to balance the weight of the Right Angle Iron. If the counterweights are not adjusted, the Indexing Table could rotate with dangerous force when unlocked. If using an Indexing Table without counterweights, be careful when unlocking the Indexing Table when the Right Angle Iron is in an unbalanced position. Use Clamps as necessary to secure the Indexing Table.

00.0

RIGHT ANGLE IRON

INDEX TABLE

TI

(CLAMPS, COUNTERWEIGHTS, AND MODELING CLAY NOT SHOWN)

SURFACE PLATE

Figure 2. 4.1.11 Ensure the TI is parallel to the vertical face of the Right Angle Iron. The TI must be secured with Clamps or Modeling Clay to prevent movement. 4.1.12 Set the TI to On and ensure the display is set for degrees. Record the TI indication, observing the sign of the indication. 4.1.13 Set the Indexing Table to 5. Record the TI indication. 4.1.14 Algebraically subtract the value recorded in step 4.1.12 from the value recorded in step 4.1.13. The result must be within the values listed in the Limits column of Table 2 for the applied angle and the TI being calibrated. 4.1.15 Repeat steps 4.1.13 and 4.1.14 for each remaining value listed in the Applied column of Table 2 for the TI being calibrated. 4.1.16 Set the Indexing Table to 0.

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4.1A ANGLE MEASUREMENT CALIBRATION: (Alternate Method) 4.1A.1 Setup the test equipment as shown in Figure 1A with the Master Level against the Sine Plate side rails. 4.1A.2 Use the Master Level and Leveling Plate to level the Sine Plate across its length and width to within 10 arc seconds. 4.1A.3 Remove the Master Level from the Sine Plate. 4.1A.4 Place the TI on the Sine Plate against the Sine Plate side rails as shown in Figure 1A. 4.1A.5 Set the TI to On and ensure the display is set for degrees. 4.1A.6 The TI must indicate within the corresponding values listed in the Limits column of Table 2A for an applied angle of 0 for the TI being calibrated.

LEVELING PLATE

SURFACE PLATE

00.0

TI (OR MASTER LEVEL)

SINE PLATE(HINGE SIDE)

Figure 1A. 4.1A.7 Rotate the TI 180 on the Sine Plate to the same location against the Sine Plate side rails. The TI display will remain right side up and face away from the technician. 4.1A.8 The TI must indicate within the corresponding values listed in the Limits column of Table 2A for an applied angle of 0 for the TI being calibrated. 4.1A.9 Rotate the TI 180 on the Sine Plate to the same location against the Sine Plate side rails as in Figure 1A. 4.1A.10 Wring together a Gage Block stack equal to the first corresponding value listed in the Gage Block Size column of Table 2A for the TI being calibrated.

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Table 2A. TI Range () Gage Block Size (in) Applied Angle () Limits () 45 N/A 0 -0.1 to 0.1 .872 5 4.9 to 5.1 -5 -4.9 to -5.1 2.588 15 14.7 to 15.3 -15 -14.7 to -15.3 5.000 30 29.5 to 30.5 -30 -29.5 to -30.5 7.071 45 44.3 to 45.7 -45 -44.3 to -45.7 60 N/A 0 -0.1 to 0.1 .872 5 4.9 to 5.1 -5 -4.9 to -5.1 2.588 15 14.9 to 15.1 -15 -14.9 to -15.1 5.000 30 29.9 to 30.1 -30 -29.9 to -30.1 7.071 45 44.9 to 45.1 -45 -44.9 to -45.1 8.5717 59 58.7 to 59.3 -59 -58.7 to -59.3 4.1A.11 Insert the Gage Block stack into the Sine Plate. 4.1A.12 The TI must indicate within the corresponding values listed in the Limits column of Table 2A for the TI being calibrated. 4.1A.13 Rotate the TI 180 on the Sine Plate to the same location against the Sine Plate side rails. The TI will remain right side up and face away from the technician.

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NOTE

The negative values listed in Table 2A are a result of rotating the TI 180 from the position in Figure 1A.

4.1A.14 The TI must indicate within the corresponding values listed in the Limits column of Table 2A for the TI being calibrated. 4.1A.15 Repeat steps 4.1A.9 through 4.1A.14 for each remaining corresponding value listed in the Applied column of Table 2A for the TI being calibrated. 4.1A.16 Remove the Gage Block stack from the Sine Plate. 4.1A.17 Remove the TI from the Sine Plate. 4.2 OVERRANGE CALIBRATION: (Preferred Method) 4.2.1 If not already done, setup the test equipment as shown in Figure 2 and repeat step 4.1.11. 4.2.2 Beginning with the Indexing Table set to a 0 starting point, slowly rotate the Indexing Table toward and then past the first corresponding value listed in the Applied column of Table 3 for the TI being calibrated. 4.2.3 The TI must indicate OVERRANGE when the Indexing Table is at or within the corresponding value(s) listed in the Limits column of Table 3 for the TI being calibrated.

Table 3. TI Range () Applied () Limits () 45 45 50 to 60 315 310 to 300 60 60 >60 300

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4.2A.5 Place the TI on the Angle Gage Block. 4.2A.6 The TI must indicate OVERRANGE. If the TI does not indicate OVERRANGE, increase the size of the Angle Gage Block. 4.2A.7 The TI must indicate OVERRANGE when the combined angle of the Angle Gage Block and Sine Plate is at or within the corresponding value(s) listed in the Limits column of Table 3A for the TI being calibrated. 4.2A.8 Rotate the TI 180 so the TI display will remain right side up and face away from the technician and repeat steps 4.2A.4 through 4.2A.7.

Table 3A. TI Range () Gage Block Size () Applied () Limits () 45 15 50 50 to 60 -50 -50 to -60 60 25 60 >60 -60 >-60 4.2A.9 Remove the Angle Gage Blocks and Gage Block stack from the Sine Plate. 4.2A.10 Remove the TI from the Sine Plate. 4.3 ALTERNATE REFERENCE AND HOLD CALIBRATION: (Preferred Method) 4.3.1 If not already done, setup the test equipment as shown in Figure 2 and repeat step 4.1.11. 4.3.2 Set the Indexing Table to 15. 4.3.3 Press the TI ALT REF button. The TI will indicate ALT REF 0.0. If the words SET ALT REF appear after the ALT REF button has been pressed, press the ALT REF button again. The TI will indicate ALT REF 0.0. 4.3.4 Set the Indexing Table to 345. 4.3.5 The TI must indicate within -29.5 to -30.5 for TIs with a range of 45 or within -29.9 to -30.1 for TIs with a range of 60. 4.3.6 Press the TI HOLD button. The display must flash repeatedly. For older models, the HOLD button must be pressed and held to enable the hold function. 4.3.7 Remove the TI from the Indexing Table and place it on the Surface Plate. 4.3.8 The TI display must remain the same value as in step 4.3.6. 4.3.9 Press the TI HOLD button. The TI will indicate in normal angle mode. For older models, release the HOLD button. 4.3.10 Press the ALT REF button. The TI will indicate in normal gravity mode. 4.3.11 Calibration complete. Secure all equipment.

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4.3A ALTERNATE REFERENCE AND HOLD CALIBRATION: (Alternate Method) 4.3A.1 If not already done, setup the test equipment as shown in Figure 1A with the Master Level against the Sine Plate side rails and repeat step 4.1A.2. After leveling, place the TI on the Sine Plate as shown in Figure 1A. 4.3A.2 Insert a 5 inch Gage Block stack into the Sine Plate. 4.3A.3 Press the TI ALT REF button. The TI will indicate ALT REF 0.0. If the words SET ALT REF appear after the ALT REF button has been pressed, press the ALT REF button again. The TI will indicate ALT REF 0.0. 4.3A.4 Remove the 5 inch Gage Block stack from the Sine Plate. 4.3A.5 The TI must indicate within -29.5 to -30.5 for TIs with a range of 45 or -29.9 to -30.1 for TIs with a range of 60. 4.3A.6 Rotate the TI 180 on the Sine Plate to the same location against the Sine Plate side rails. The TI will remain right side up and face away from the technician. 4.3A.7 Press the ALT REF button. The TI will indicate in normal gravity mode. 4.3A.8 Repeat steps 4.3A.2 through 4.3A.4. 4.3A.9 The TI must indicate within 29.5 to 30.5 for TIs with a range of 45 or 29.9 to 30.1 for TIs with a range of 60. 4.3A.10 Press the TI HOLD button. The display must flash repeatedly. For older models, the HOLD button must be pressed and held to enable the hold function. 4.3A.11 Remove the TI from the Sine Plate and place it on the Surface Plate. 4.3A.12 The TI must indicate the same value as in step 4.3A.10. 4.3A.13 Press the TI HOLD button. For older models release the HOLD button. The TI will indicate in normal angle mode. 4.3A.14 Press the TI ALT REF button. The TI will indicate in normal gravity mode. 4.3A.15 Calibration complete. Secure all equipment. 4.4 CLINOMETER SENSOR CALIBRATION: (For Independent Clinometer Sensors without Angle Display Only)

CAUTION

The TI Sensor contains an electronic microcircuit which can be damaged by static electricity. A grounding wrist strap must be worn when handling the Sensor and the Sensor must be stored in a static protective bag. Use care not to damage the Sensor when mounting the Sensor to the Right Angle Iron.

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NOTE

This paragraph will only be performed when calibrating an independent TI Sensor which does not have an angle display. The calibration consists of measuring the Sensor output voltage for applied input angle and recording the values in a calibration chart which is provided to the user.

4.4.1 Connect the DC Power Supply and Digital Multimeter to appropriate power sources, set Power switches to On and allow warm-up IAW manufacturer instructions. 4.4.2 Setup the test equipment as shown in Figure 3 with the Right Angle Iron against the Sine Plate side rails. Position the TI Sensor so the centerline of the Sensor mounting holes is perpendicular to the to the working surface of the Sine Plate. The TI Sensor must be secured with Clamps or Modeling Clay to prevent movement. The lettering on the Sensor must be right side up and facing the technician. This is the TI Direct position. 4.4.3 Place the Master Level on the Sine Plate. Use the Master Level and Leveling Plate to level the Sine Plate across its length and width to within 10 arc seconds. 4.4.4 Connect the TI Sensor to the DC Power Supply and set the input voltage to the TI to 12 VDC and -12 VDC. 4.4.5 Connect the TI Sensor output to the Digital Multimeter. 4.4.6 Adjust the orientation of the TI Sensor on the Right Angle Iron until the Digital Multimeter indicates within -0.006 to 0.006 VDC. 4.4.7 Rotate the Right Angle Iron 180 to the same location against the Sine Plate side rails. This is the TI Reverse position. The lettering on the TI Sensor will remain right side up and face away from the technician.

LEVELING PLATE

SURFACE PLATE

SINE PLATE(HINGE SIDE)

RIGHT ANGLE IRON

TI

TI MOUNTING HOLES

CL

(CLAMPS/MODELING CLAY NOT SHOWN)

Figure 3. 4.4.8 The Digital Multimeter must indicate within -0.006 to 0.006 VDC. If not, adjust the orientation of the TI Sensor on the Right Angle Iron.

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4.4.9 Alternately rotate the TI Sensor between the Direct and Reverse positions and adjust the orientation of the Sensor on the Right Angle Iron until the Digital Multimeter indication remains within -0.006 to 0.006 VDC in both positions.

NOTE

The TI Sensor 0 reference angle has now been established. Use care not to bump or move the Sensor from the present orientation on the Right Angle Iron.

4.4.10 Ensure the TI Sensor is in the Direct position. 4.4.11 Use Sample Worksheet 1 in Appendix A to record the Digital Multimeter indication as the 0 Angle Output Voltage. 4.4.12 Wring together a Gage Block stack equal to the first corresponding value listed in the Gage Block Size column of Table 4 for the TI being calibrated.

NOTE

When the TI Sensor is in the Direct position, the angle established on the Sine Plate will produce a positive TI Sensor output voltage. When the TI Sensor is in the Reverse position, the angle established on the Sine Plate will produce a negative TI Sensor output voltage.

4.4.13 Insert the Gage Block stack into the Sine Plate. 4.4.14 Record the Digital Multimeter indication in the corresponding Output Voltage column of Sample Worksheet 1 in Appendix A. 4.4.15 Rotate the TI Sensor 180 to the Reverse position in the same location against the Sine Plate side rails. 4.4.16 Record the Digital Multimeter indication to the second decimal place in the corresponding Output Voltage column of Sample Worksheet 1 in Appendix A. 4.4.17 Repeat steps 4.4.12 through 4.4.16 for each remaining corresponding value listed in the Gage Block Size column of Table 4 for the TI being calibrated.

Table 4. TI Range () Gage Block Size (in) Applied Angle () 45, 60 N/A 0 0.872 5 -5 2.588 15 -15 5.000 30 -30

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Table 4. (Cont.) TI Range () Gage Block Size (in) Applied Angle () 45, 60 (Cont.) 7.071 45 -45 60 Only 8.5717 59 -59 4.4.18 Set the DC Power Supply and Digital Multimeter Power switches to Off. 4.4.19 Annotate the Certification Label: Refer to Sample Worksheet. Place a copy of the completed Sample Worksheet 1 with the TI. 4.4.20 Calibration complete. Disconnect and secure all equipment.

CALIBRATION PERFORMANCE TABLE

Not Required

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APPENDIX A

Sample Worksheet 1.

Clinometer Sensor

P/N:___________________________ Date Calibrated:______________________________ S/N:___________________________ Calibrated by:________________________________ Applied Angle Clinometer Sensor Output Voltage (VDC) 0 ________________________ 5 ________________________ -5 ________________________ 15 ________________________ -15 ________________________ 30 ________________________ -30 ________________________ 45 ________________________ -45 ________________________ 59 * ________________________ -59 * ________________________ * For Clinometer Sensors with a range of 60 only

A-1/(A-2 Blank)

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APPENDIX B

Adjustment Procedure

B.1 INTERNAL CALIBRATION FOR TI WITH 45 RANGE:

NOTE

Adjustments will be performed only if the TI fails to meet the parameters of the Calibration Process. Adjustment to the TI will recalculate internal correction factors which are stored in the TI memory.

NOTE

If the TI battery is removed, the correction factors calculated in this paragraph will be lost from the TI memory and the TI will revert to factory determined values.

B.1.1 Setup the test equipment as shown in Figure 1A with the Master Level against the Sine Plate side rails. B.1.2 Use the Master Level and Leveling Plate to level the Sine Plate across its length and width to within 10 arc seconds. B.1.3 Remove the Master Level from the Sine Plate. B.1.4 Remove the rear cover of the TI. Set the TI to On.

NOTE

Some older model TIs do not have a Calibration Switch and the Internal Calibration cannot be performed.

B.1.5 Refer to Figure B-1. Use a small, blunt object, such as a ball point pen, to press the TI Calibration switch.

CAUTION

Do not move the TI Sensor shown on the left side of the TI in Figure B-1.

TI

SENSOR

BATTERY

CALIBRATION SWITCH

DO NOT MOVE

Figure B-1.

B-1

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B-2

APPENDIX B (Cont.) B.1.6 Replace the rear cover of the TI. The TI will indicate 3.0. Older model TIs will indicate P30. B.1.7 Place the TI on the Sine Plate against the Sine Plate side rails shown in Figure 1A. B.1.8 Insert a 5.000 inch Gage Block stack into the Sine Plate. B.1.9 Wait 2 minutes to allow the TI indication to settle. Press the TI HOLD button. After about 5 seconds, the TI will indicate 0.0. Older model TIs will indicate P0.

NOTE

Do not move the TI until the display indicates 0.0 or P0. B.1.10 Remove the 5.000 inch Gage Block stack from the Sine Plate. B.1.11 Wait 2 minutes to allow the TI indication to settle. Press the TI HOLD button. After about 5 seconds, the TI will indicate -0.0. Older model TIs will indicate -P0.

NOTE

Do not move the TI until the display indicates -0.0 or -P0. B.1.12 Rotate the TI 180 on the Sine Plate to the same location against the Sine Plate side rails. The TI will remain right side up and face away from the technician. B.1.13 Wait 2 minutes to allow the TI indication to settle. Press the TI HOLD button. B.1.14 Internal Calibration complete. Repeat para 4.1 through 4.3 or 4.1A through 4.3A. B.2 INTERNAL CALIBRATION FOR TI WITH 60 RANGE:

NOTE

Adjustments will be performed only if the TI fails to meet the parameters of the Calibration Process. Adjustment to the TI will recalculate internal correction factors which are stored in the TI memory.

NOTE

If the TI battery is removed, the correction factors calculated in this paragraph will be lost from the TI memory and the TI will revert to factory determined values.

B.2.1 Setup the test equipment as shown in Figure 1A with the Master Level against the Sine Plate side rails. B.2.2 Use the Master Level and Leveling Plate to level the Sine Plate across its length and width to within 10 arc seconds. B.2.3 Remove the Master Level from the Sine Plate. B.2.4 Remove the rear cover of the TI. Set the TI to On.

NOTE

Some older model TIs do not have a Calibration Switch and the Internal Calibration cannot be performed.

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APPENDIX B (Cont.) B.2.5 Refer to Figure B-1. Use a small, blunt object, such as a ball point pen, to press the TI Calibration switch.

CAUTION

Do not move the TI Sensor shown on the left side of the TI in Figure B-1. B.2.6 Replace the rear cover of the TI. The TI will indicate P45. B.2.7 Place the TI on the Sine Plate against the Sine Plate side rails as shown in Figure 1A. B.2.8 Insert a 7.071 inch Gage Block stack into the Sine Plate. B.2.9 Wait 2 minutes to allow the TI indication to settle. Press the TI HOLD button. After about 5 seconds, the TI will indicate P.0.

NOTE

Do not move the TI until the display indicates P.0. B.2.10 Remove the 7.071 inch Gage Block stack from the Sine Plate. B.2.11 Wait 2 minutes to allow the TI indication to settle. Press the TI HOLD button. After about 5 seconds, the TI will indicate -P.0.

NOTE

Do not move the TI until the display indicates -P.0. B.2.12 Rotate the TI 180 on the Sine Plate to the same location against the Sine Plate side rails. The TI will remain right side up and face away from the technician. B.2.13 Wait 2 minutes to allow the TI indication to settle. Press the TI HOLD button. After about 5 seconds, the TI will indicate 0.00.

NOTE

Do not move the TI until the display indicates 0.00. B.2.14 Internal Calibration complete. Repeat para 4.1 through 4.3 or 4.1A through 4.3A.

B-3/(B-4 Blank)