(32SII) Pressure-Monitoring Method for course measurement
04-15-2024, 11:49 AM
Post: #1
 SlideRule Senior Member Posts: 1,462 Joined: Dec 2013
(32SII) Pressure-Monitoring Method for course measurement
An excerpt form Measurement News, Use of Programmable Hand-Held Calculators to Simplify the Pressure Monitoring Method for Course Measurement pgs. 37-40, USA Track & Field/Road Running Technical Council, Fall 2006, Issue 133

Calculations used in the pressure-monitoring method for course measurement have been automated using programmable hand-held calculators. In calibration, wheel rim readings in hundredths of a revolution and one tire pressure reading are directly keyed into the calculator. On each measurement of a 5 km race course, a pressure reading is keyed into the calculator and it automatically shows the number of revolutions necessary to complete the course at the current calibration factor. That measurement which yields the longest course is the one used for certification purposes. More than one pressure reading is taken in courses longer that 5 km.

1. Introduction
I find that in the field measuring courses, the stress of heavy traffic and sometimes hostile weather conditions reduces my clarity of thought. Therefore, I thought to reduce errors and reduce time in the field, I should automate calculations using my programmable calculators I had on hand.

2. Calculators
The HP 32SII is a nice RPN calculator with a large clear display, but unfortunately has not been manufactured for several years. It has become a classic and the present-day price is \$400. …

3. Calculation of calibration factor

5. 5 km program for HP 32SII and 33s
A
A0001 LBL A
A0002 INPUT A
A0003 INPUT B
A0004 INPUT E
A0005 INPUT C
A0006 INPUT D
B
B0001 LBL B
B0002 INPUT F
B0003 (A+B+C+D) x 0.04171+2385.717+(E-F) x 0.0665
B0004 STO G
B0005 VIEW G
B0006 G x 0.3218688
B0007 STO H
B0008 VIEW H
B0009 G x 0.0343936
B0010 STO I
B0011 VIEW I
B0012 GTO B
B0013 RTN

6. Typical calculator inputs
Pre-calibration (rim readings in hundredths of a rev, pressure in kPa): 58, 62, 578, 58, and 62.
Measurement 1: 580 kPa
Measurement 2: 570 kPa

8. Operation of the 33s (and similarly the 32SII)
Below is shown the results from the above typical inputs:

Keys            Display
DISPLAY FIX 2

XEQ A          A? (old value)
58 R/S         B?
62 R/S         E?
578 R/SC?
58 R/S D?
62 R/S         F?
580 R/S G = 2395.59
R/S             H = 771.07
R/S              I = 82.39
R/S              F?
570 R/S G = 2396.26
R/S              H = 771.28
R/S              I = 82.42
MODES 1      771.28  82.42
If the calculator is turned off, the last two numbers reappear when it is turned on again.

9. Suggested procedure for a 5-km certification

10. Suggested procedures for certification of courses longer than 5 km

BEST!
SlideRule
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