Pennsylvania Code
Title 67 - TRANSPORTATION
Part I - Department of Transportation
Subpart A - Vehicle Code Provisions
Article VI - Operation of Vehicles
Chapter 105 - MECHANICAL, ELECTRICAL AND ELECTRONIC SPEED-TIMING DEVICES
Subchapter D - ELECTRONIC DEVICES (NONRADAR) WHICH MEASURE ELAPSED TIME BETWEEN TWO SENSORS
Section 105.56 - Manner of calibration and testing

Universal Citation: 67 PA Code § 105.56

Current through Register Vol. 54, No. 44, November 2, 2024

(a) Electrical Speed-Timing System-Manufactured by Richard Hageman, 98 South Penn Dixie Road, Nazareth, Pennsylvania. Calibration requirements are as follows:

(1) Required equipment. The following equipment or equivalent substitute equipment is required for calibration:

(i) USM 207 Universal Counter.

(ii) STALO E1010V.

(iii) Miscellaneous test leads.

(2) Calibration procedure. (See Appendix A, Figure 3 for equipment set up.) The calibration procedure shall be as follows:

(i) Set counter (USM 207) to Time (B-C) Mode.

(ii) Throw start switch on USM 207 and Electrical Speed-Timing System will start at same time.

(iii) Switch start override on.

(iv) Throw stop switch, stopping USM 207 and Electrical Speed-Timing System at same time.

(v) Read and record elapsed time of both devices.

(vi) Miles per hour (mph) is calculated as follows:

(A) Feet per second = measured distance-in feet-divided by time elapsed-in seconds.

(B) mph = .6818 x feet per second.

(vii) If the readout on the face of the Electrical Speed-Timing System differs by more than 1 mph, the unit shall be returned to the manufacturer and tagged with the date tested, the serial number of the device and a notation of the general condition of the device.

(b) Model TK 100, Excessive Speed Preventor (ESP)-Manufactured by Systems Innovation, Inc., Steam Hollow Road, R.D. 2 and Hallstead Plaza, Route 11, Hallstead, Pennsylvania.

(1) Required equipment. The following equipment or an equivalent substitute is required for calibration:

(i) Test Cable-Model TK 100-01. Manufactured by Systems Innovation, Inc. (See Appendix A, Figure 4 for an equivalent substitute.)

(ii) Power supply. Voltage output-11 to 14 volts dc .5 amp. (See Appendix A, Figure 5).

(iii) Frequency counter. Data Precision-Model 5740 or equivalent. (See Appendix A, Figure 5).

(iv) Digital delay generator. Range: .1 ms to 800 ms; Accuracy: + or - .1%. (See Appendix A, Figure 6).

(2) Calibration procedure. The calibration procedure shall be as follows:

(i) Interconnect the ESP Model TK 100 as shown in Appendix A, Figure 6.

(ii) Place the ESP switches in the following positions:

(A) Power On/Off-Off.

(B) Auto/Lock-Auto.

(D) Alert On/Off-Either one.

(E) Set Alert-on or off.

(iii) Set the digital delay generator to the nearest .1 ms-.0001 sec.-using the following formula:

Delay time = 4091 divided by SPEED mph

Example: To check the ESP Accuracy at 50 mph, set the delay time as follows:

Delay Time = 4091 divided by 50 mph = 81.8 ms.

(iv) Place the ESP Power On/Off Switch to On. The ESP shall read 000.

(v) Check that the frequency counter reads 1,000,000 Hz + or -999 Hz.

(vi) Press the start switch and observe that the ESP reads within 1 mph of the desired test speed.

(vii) Check and record the ESP readings from 20 mph to 140 mph in 5 mph increments.

(viii) If the ESP failed one or more of the previous tests, it shall be returned to the manufacturer or to a service center approved by the manufacturer and tagged with the date tested, the serial number of the device and a notation of the general condition of the device.

(ix) If the ESP has passed the previous tests, calibration is complete.

(c) Speed Chek-(identified on the housing as Speed Chek model one, mfd. for: The Union Agency, Unionville, Pennsylvania 19375). Manufactured by Sterner Lighting Systems, Inc., 351 Lewis Avenue, Winsted, Minnesota.

(1) Required equipment. (See Appendix A, Figure 7 for test setup). The following equipment is required for calibration:

(i) Two pulse generators.

(ii) Dual channel oscilloscope or counter with interval capability.

(iii) Power supply-+5 volts.

(2) Calibration procedure. (See Appendix A, Figure 8 for interconnection diagram). Calibration procedures shall be as follows:

(i) A single circuit to generate the signals that simulate the front wheels of a vehicle crossing the tape switches shall be set up as set forth in Appendix A, Figures 5 and 6.

(ii) The elapsed time between the pulse on Outputs 1 and 2 is measured by the Speed Chek using the formula V x T = 3408. 3408 is the proper constant for a 5-foot road switch spacing.

V = velocity in mph

T = time in ms.

(iii) The elapsed interval time is computed by the equation:

Click to view image

and compared to the readout on the Speed Chek.

(iv) If the readout on the face of the Speed Chek differs by more than 1 mph, the unit shall be returned to the manufacturer or to a service center approved by the manufacturer and tagged with the date tested, the serial number of the device and a notation of the general condition of the device.

(d) Model TK 100, Excessive Speed Preventor (ESP) Infrared-Manufactured by Systems Innovation, Inc., Steam Hollow Road, R. D. 2 and Hallstead Plaza, Route 11, Hallstead, Pennsylvania.

(1) Required equipment. The following equipment or an equivalent substitute is required for calibration:

(i) Test Cable-Model TK 100-01. Manufactured by Systems Innovation, Inc. (See Appendix A, Figure 4 for an equivalent substitute.)

(ii) Power supply. Voltage output-11 to 14 volts dc .5 amp.

(iii) Frequency counter. Data Precision-Model 5740 or equivalent.

(iv) Digital delay generator. Range: .1 ms to 800 ms; Accuracy: + or - .1%.

(2) Calibration procedure. The calibration procedure shall be as follows:

(i) Interconnect the ESP Model TK 100 Infrared as shown in Appendix A, Figure 6.

(ii) Place the ESP Infrared switches in the following positions:

(A) Power On/Off-Off.

(B) Auto/Lock-Auto.

(D) Alert On/Off-either one.

(E) Set Alert-on or off.

(iii) Set the digital delay generator to the nearest .1 ms-.0001 sec.-using the following formula:

Delay time = 2045 divided by speed mph

Example: To check the ESP Infrared Accuracy at 50 mph, set the delay time as follows:

Delay time = 2045 divided by 50 mph = 40.9 ms.

(iv) Place the ESP Infrared Power On/Off Switch to On. The ESP Infrared shall read 000.

(v) Check that the frequency counter reads 1,000,000 Hz + or -999 Hz.

(vi) Press the start switch and observe that the ESP Infrared reads within 1 mph of the desired test speed.

(vii) Check and record the ESP Infrared readings from 20 mph to 140 mph in 5 mph increments.

(viii) Connect infrared sensors and turn on test panel switch.

(ix) Turn rotary switch to the 20 mph position and press test switch. Reading shall be within the tolerances of + 0 to -2 mph. Repeat for test speeds of 60 mph and 140 mph.

(x) If the ESP Infrared failed one or more of the previous tests, it shall be returned to the manufacturer or to a service center approved by the manufacturer and tagged with the date tested, the serial number of the device and a notation of the general condition of the device.

(xi) If the ESP Infrared has passed the previous tests, calibration is complete.

(e) Enradd, Model EJU-91-Manufactured by Y.I.S., Incorporated, 1049 Hartley Street, P. O. Box 3044, York, Pennsylvania 17404.

(1) Required equipment. The following equipment or an equivalent substitute is required for calibration:

(i) Two pulse generators.

(ii) Dual channel oscilloscope or frequency counter with interval capability.

(iii) Power supply, + 5 volts.

(2) Calibration procedure. (See Appendix A, Figure 8 for interconnection diagram). Calibration procedures shall be as follows:

(i) A single circuit to generate the signals that simulate the front wheels of a vehicle crossing the road sensor shall be set up as set forth in Appendix A, Figure 7.

(ii) The elapsed time between the pulse on Outputs 1 and 2 is measured by the Enradd using the formula V x T = 3408. 3408 is the proper constant for a 5-foot timing strip spacing.

V = velocity in mph

T = time in ms

(iii) The elapsed interval time is computed by:

(A) Calculation of the equation:

V = 3408

(B) Comparison of the readout on the oscilloscope/frequency counter to the readout on the Enradd.

(iv) If the readout on the face of the Enradd differs by more than +/- 1 mph, the unit shall be returned to the manufacturer or to a service center approved by the manufacturer and tagged with the date tested, the serial number of the device and a notation of the general condition of the device.

(f) Equipment, timing strips and other devices. The calibration and testing of equipment, timing strips and other devices actually used with a particular electronic device-nonradar-shall be performed under specifications provided by the manufacturer of an approved device using equipment specified by the manufacturer or equivalent substitute equipment.

This section cited in 67 Pa. Code § 105a.4 (relating to system and speed timing device use and certification).

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