ABOUT THE CALIBRATION PROCESS

Our supplier, KI4U, Inc of Gonzalas, TX, is licensed and authorized by the State of Texas and the Federal Government perform these calibration services in accordance with standards as set forth by the State of Texas, FEMA, ASTM and the NRC.

Prior to calibration, all instruments sold on this page are taken through the extensive preventative maintenance, tests, and evaluations. These include:

  • Confirm integrity of case, meter, and snap connections
  • Confirm that the mandatory retrofit had been completed on CD V-715's
  • Check that extension cable is intact and serviceable on CD V-717's
  • Clean battery contacts and battery terminals, as required
  • Confirm good ground connections on circuit board
  • Check screws attaching the circuit board to the case top
  • Visual check of circuit board for metal foil cracks, cold solder joints, or solder bridges
  • Clean circuit board with brush and solution, heat to dry
  • Clean high megaohm resistors, as needed
  • Clean high megaohm resistors switch, as needed
  • Check for dirt contamination of the high impedence feed-thru insulator on ionization chamber, clean if necessary
  • Test ionization chamber for loose (broken) internal components
  • Test ionization chamber for leakage via Megohm meter, re-coat with clear varnish, if necessary
  • Insert battery
  • Perform Zero and Circuit Check operations after two minute warmup at Zero setting
  • Check meter needle for free movement throughout range
  • Commence a power-on 16-hour burn-in to recondition the electrometer tube
  • Repeat the Zero and Circuit Check Test
  • Perform stability evaluation of the meter needle throughout all the ranges. The needle should not deflect more than three of the smallest increments upscale (0.3 on the meter face) on the "X100", "X10", and "X1" scales and six increments (0.6 on the meter face) on the "X0.1" scale
  • Remove batteries
  • Check instrument case top gasket, apply light coat of D-5 compound to it, if needed
  • Place fresh desiccant packet in case before closing
  • Clean outside casing and tag it

Successful completion of the above procedures has the meter now qualified to be calibrated. Successfully passing the calibration certification process, they are then fully ready for reliable, accurate and confident service in the field.

All calibration certifications of these Civil Defense survey meters is accomplished with the CD V-794 calibrators built specifically for these type meters. This calibrator utilizes a N.I.S.T. traceable Cs-137 source that tests and calibrates (adjusts) mid-scale for all the ranges strictly in accordance with industry standards.

Successfully calibrated instruments have a certification label affixed to them certifying their calibration, the Engineer performing the calibration, as well as time, date, serial number and model designation.