Jordan charger to charger direct reading dosimeters

The Jordan 750-5 Charger is a compact lightweight charger designed to charge most direct-reading quartz fiber dosimeters. This instrument features a fully transistorized and printed circuit board. Power required for operation is furnished by a single "D" flashlight type battery, capable of recharging dosimeters thousands of times before replacement is necessary, thus making it an economical and reliable charger to operate. A safety spring located in the charging socket of the Model 750-D prevents damage to the dosimeter in the event that excessive pressure is exercised when recharging. Both moisture-proof and dust-proof, the charger also features a protective cap to prevent any moisture or dust from accumulating in the charging socket when not in use.

Model	750-5
Range	200 to 250 volts
Battery Complement	1.5 v "D" cell, carbon
Mil - Spec	FSN 665-00-856-8813
Weight	1.25 lbs
Shipping Weight	2 lbs
Volume	.1 cubic feet
Finish	light and dark grey enamel
Dimension	Approx. 4.1 x 4.1 x 2.75 inches
Operating Conditions
Temperature	-20 F to + 140 F
Humidity	No effect, unit has water and dust tight seals
Altitude	Independent of pressure changes from sea level to over 50,000 ft
Construction	Cover: Heavy aluminum casting Case: Drawn Steel. (0.025 c.r.s.) Built to meet rigid Military standards requirements for extremes of temps, altitude, shock and Vibration
Operation & Maintenance
Description
The JN-750-5 is a self contained battery operated instrument. This instrument will charge to zero any self-reading dosimeter or Direct Reading Dosimeter (DRD) as sometimes they are referred to. The JN 750-5 is manufactured to ANSI specs. It has a “charging contact” and a “down-scale / up scale” control for setting the hairline indicator in each meter to zero. The charger is powered by a single 1.5 V “D-cell” flashlight battery which operates the charging circuit and the light for illuminating the meter scales. No tools are required to change the battery or the light bulb, and there are no internal adjustments to be made to the charger.

Operating Instructions
To charge (Zero) a Dosimeter
1. Place dosimeter on charging contact and PRESS DOWN FIRMLY. 2. Rotate voltage control until hairline image on the dosimeter scale is at zero 3.Remove dosimeter and check reading using charger light (rezero if necessary).
To Read a Dosimeter
Maintenance
A. To Open Case Loosen screw on top of cover and remove cover
B To Replace Bulb 1. Open case 2. Remove bulb 3. Replace with spare bulb ( No. 131 bulb or equivalent) Note: There is a hole in the circuit board that will allow storage of a spare bulb, a grommet is necessary to accommodate the bulb (grommet and spare bulb not included)
C To Replace Battery 1. Open case 2. Lift out battery 3. Replace with 1.5 – volt D-cell battery CAUTION: Orient battery as shown by + Pos and – labels on the circuit board
A. Care of Charging Contact Always keep the protective cap on the charging contact when the charger is not in use. The clear plastic surfaces of the charging contact should be dry, clean and free of fingerprints. A soft cloth free of grit,dirt, lint or moisture may be used to clean the plastic surfaces. CAUTION: Do not use solvent or cleaning fluid to clean plastic ( solvents can craze plastic
Storage
A. Remove the battery from charger, if it is to be stored for more than 2 months B. Store with case closed and protective cap on charging contact
Preventative Maintenance ( once a month)
A. Clean battery contacts to bright metal with steel wool or equivalent. B. Check battery and bulb (replace as required) C. Check electrical operation
Trouble Shooting
If instrument does not appear to operate normally, it may be for one of the following reasons:
Abnormal Condition	Probable Cause	Corrective Action
Light weak or fails to go on when charging contact is depressed	Weak Battery Dirty (Corroded) battery or light switch springs contacts Loose light bulb Burned out bulb	Replace Battery Clean battery and light switch contacts to bright metal with steel wool or equivalent. Tighten bulb in socket Replace bulb
Shadow appear on dosimeter scale	Dirt on charging contact Dirt on either end of dosimeter	Clean charging contact Clean dosimeter seal and eye-piece with clean dry lint free cloth
Fiber image unsteady (jittery movement of fiber image when rotating voltage control	Poor contact of dosimeter with outer aluminum sleeve of charging contact.	Keeping the dosimeter vertical, move dosimeter sideways to make the charging contact sleeve touch the inside wall of the dosimeter charging recess
Light illuminated scale, but fiber image does not appear on scale with rotation of voltage control.	Poor contact of dosimeter with outer aluminum sleeve of charging contact. Dirt or moisture on charging end of dosimeter or charging contact Faulty circuit component or connections	Same as above Clean or dry faulty part. Replace charger with new one
Warranty
There is a 1 year warranty, but shall not apply in any instances where there is evidence of damage by accident, misuse, or alteration.