The Tinker & Rasor Model AP Voltage Regulated Holiday is a portable, all-purpose electrical inspection instrument which maintains a given inspection voltage in spite of the electrical load on the circuit or the charge on the battery. It is recommended for use on any pipe diameter as well as on flat surfaces when such surfaces are coated with a highly electrical resistance material, and when the surface beneath the coating is electrically conductive. The detector works equally well on damp or dry surfaces, and is especially desirable where humid conditions prevail. 
 
 

2. UNPACKING & INSPECTION

A. Open the carrying case and make note of where the various accessories are located. To 
     ensure proper storage, repack accessories in the same manner when not in use. 

B. Inspection should be made upon receipt. If damage has occurred during shipment, file a 
     claim with the carrier immediately. 

C. If it is necessary to contact your supplier or the manufacturer concerning damaged or 
     missing items, be sure to include the serial number, purchase order number, and invoice 
     number of the instrument in question. 
 
 

3. CHECK-OUT INSTRUCTIONS

A. Remove all accessories from the carrying case with the exception of the battery charger. 
     (The instrument is shipped with two batteries, one of which us already in the unit). 

B. Make sure that the detector is turned OFF. 

C. Using the VOLTAGE SELECTION TABLE on the back panel, select the specific voltage 
     required Unscrew the protective cap on the SELECTOR and use a screwdriver to turn the 
     switch to the HI or LO position. Replace black plastic cap cover. Use same procedure to 
     adjust voltage settings. 
 

     CAUTION: Always change HI-LO switch with detector turned OFF. 
 

D. Connect high voltage cable and ground cable to detector (insert and twist clockwise). 

E. Attach probe handle to voltage cable. 

F. Attach electrode to the voltage probe assembly and apply to the structure to be inspected.
     The electrode should always make intimate contact with the surface under inspection. 

G. The Model AP Holiday Detector is now ready to operate. 
 
 

4. OPERATING METHODS

A good ground return system for both the pipe and the detector will always provide the best and most reliable inspection. The pipe to be inspected must be grounded from the bare pipe to earth at some point along the pipe. If individual joints of the pipe are to be inspected that are not electrically connected, each joint must be grounded. 

The speed of the electrodes travel along the pipe should never be excessive, since faulty inspection may result. Occasional checks of the detector operation should be made, particularly if no holidays are being found. this can be accomplished by testing for the spark and signal at the edge of the coating where bare pipe exists, or by touching the probe end to the bare pipe and noting the length of the spark and the signal effectiveness. 

If the signal does not occur when the spark discharges from the electrode into a known holiday, the ground return (i.e. the path between the metallic pipe and earth and the earth to the ground trail of the detector) is of high resistance. In this case, a better ground is required and a direct connection between the metal pipe and the ground wire may be necessary. This type of grounding is extremely uncommon unless the soil is very dry of the detectors output is low. 

Correct voltage output for a given thickness of coating has long been a matter of controversy. However, recent formulas have been suggested which may be used as a guide for correct peak voltages on various coating thickness. the calculation is as follows: 

V = K√ T WHERE 
V = Peak voltage in volts.
√T = Squareroot of the Thickness of bonded coating in mils (not including outer wrappers). 
K = Constant of 1,250 for coatings over 30 mils and 525 for fusion bonded epoxy coatings. 

These formulas when applied to a coating of 3/32" thickness and with a constant of 1,250 would indicate an applied voltage of 12,500 volts peak or a coating of 16 mil thickness and with a constant of 525 would indicate an applied voltage of 2,100 volts peak. A common practice used in setting inspection voltages in the field I s to adjust the output voltage by visual observation. It is the general consensus that spark discharge at least twice the thickness of the coating will give adequate inspection. 

Consult the coating manufacturer for recommended voltage applications.
 
 

5. INSTRUMENT SERVICING INSTRUCTIONS

A. Cleaning

     Keep the instrument clean and dry. Clean the instrument case with a soft cloth 
     dampened with kerosene, then wipe dry. Do not use solvents such as lacquer thinner, 
     methyl ethyl keytone, etc. KEEP ALL ELECTRICAL CONTACTS CLEAN. 
 

B. Voltage Output Checks

     1. In case of LOW output voltage:

         a. Check position of voltage selector switches. 
         b. Check battery (is it fully charged?). 
         c. Check for "parted conductor in voltage probe and/or ground trail. 
 

     2. In case of NO output voltage: 

         a. Check battery. 
         b. Check for "parted" conductor in voltage probe and/or ground trail. 
         c. Check battery contacts, MAKE SURE THEY ARE CLEAN. 
 
 

6. BATTERY CHARGING INSTRUCTIONS

A. Use ONLY the battery charger provided. 

B. Charge battery nightly after use. 

C. To charge battery in the instrument. 

     a. Connect plug of the battery charger to jack on battery through access door. 
     b. Plug AC power cord into proper outlet. 
 

D. Charger indicator light is on during charging. It will begin to flash on and off when battery is
      fully charged. 
 

E. To charge battery OUTSIDE the instrument: 

     a. Remove battery through battery access door. 
     b. Connect battery charger plug to battery jack and follow step C above. 
 

F. Charge battery at temperatures above 45 degrees for best results. 

G. Always disconnect charger from battery and AC outlet when not in use. 
 
 

7. BATTERY MAINTENANCE INFORMATION

A. When instrument fails to operate normally the battery may be fully discharged. Recharging 
     battery nightly will extend battery life. 

B. Store at room temperature 68 degrees F (20 degrees C) or below when not in use. 

     Note: Do not store battery in discharged state. Recharge every 30 days, if not in use. 
 
 

8. SHIPPING INSTRUCTIONS

All instruments being returned for repair should be sent PREPAID to either address below: 

Tinker & Rasor
417 Agostino Road
P.O. Box 281
San Gabriel, CA 91778