Hand-cranked Megohmmeter Model 1250N The AEMC(R) Model 1250N is a compact, self-contained, hand-cranked True Megohmmeter (R). This practical and dependable instrument is designed for a broad range of plant and field service applications, such as acceptance testing and preventive maintenance of wiring, cables, switchgear and motors. The easy hand-cranked operation provides a steady, DC voltage output across the entire range for consistently reliable readings. The Model 1250N has three test voltages for insulation resistance testing: 250V, 500V and 1000V. Test voltages are generated in full across the entire measurement range. The Model 1250N incorporates a built-in, sealed alternator and constant DC voltage circuit to provide a very stable resistance reading. The megohmmeter is ruggedly built, with a safety-yellow cast aluminum case, aluminum lid and polycarbonate front panel. The Model 1250N is designed for harsh, heavy-duty use. An O-ring seal between the front panel and case protects the unit against water and dust. The crank folds against the unit for storage. This analog instrument has a unique auto-ranging feature which expands the scale ten times: when the pointer reaches near the end of scale, the auto-ranging feature activates, returning the pointer to the beginning of the scale with the x10 red LED indicator on. scale is large and easy-to-read, and has direct-reading on all ranges. A green LED on the front panel illuminates when the proper crank speed is attained, indicating the presence of the selected output. The Model 1250N has four terminals including a guard terminal and an instrument ground terminal for user safety. The Model 1250N is supplied with a carrying strap with lead pouch, a full complement of test leads, clips and test probe to perform any test. Insulation resistance is indicated with a rugged taut-band meter movement on a logarithmic scale. The indicator Hand-cranked Megohmmeter Model 1210N (pdf) 12/05 Rev. 03 Technical Assistance (800) 343-1391 www.aemc.com 1 of 4 Features Specifications * True Megohmmeter (R) * Test voltages of 250V, 500V and 1000V MODEL ELECTRICAL Power Source * Insulation measurements to 5000M * LED indicates constant voltage output and proper cranked speed * Automatic discharge when measurement is finished * Auto-Ranging -- dual scale operation for better sensitivity and easier readings * Designed for harsh environments: marine, mining, heavy-duty field, industrial and military use * Extra rugged cast aluminum case, O-ring sealed against rain, water and dust; aluminum lid * Compact, self-contained package; folding crank * Large direct-reading scale * Double Insulation INSULATION TESTS Test Voltage 250V (Auto-Ranging) 500V 1000V Short Circuit Current Accuracy Automatic Discharge Charging Time 250V 500V 1000V MECHANICAL Scale Test Voltage Indicator Auto-Range Indicator Dielectric Test Meter Movement Dimensions Weight Case * CE Mark Applications Terminals * Acceptance testing and preventive maintenance SAFETY Safety Rating * Test motors, cables, switchgears and electrical wiring installations 1250N Hand-cranked, heavy duty brushless alternator and solid state rectification and amplification for stable voltage; test voltage reached at 140rpm (approx) 11 to 11M; 111 to 500M 11 to 11M; 111 to 500M 10 to 110M; 110 to 5000M 5mA (approx) 2% of Full Scale Length 8s/F 0.2s/F 0.5s/F 0.5s/F Direct reading on M and voltage scales; 3" (76mm), black on white Green LED indicates proper test voltage and crank speed Red LED indicates Auto-Range; multiply M readings x 10 2000V, 50/60Hz, between (-), (+), and ground terminals Rugged taut band suspension 4.7 x 4.7 x 5.1" (120 x 120 x 130mm) 3.3 lbs (1.5kg) Cast aluminum alloy case and lid painted safety-yellow, with heavy duty gray polycarbonate front panel; O-ring seal between front panel and case; sealed against water and dust; folding crank Guard "+" Line (red); "-" earth (black); guard (blue), and ground; accept standard 4mm banana plugs or spade lugs EN 61010-1, 600V, Cat. II; 1000V, Cat. I Double Insulation Yes CE Mark Yes * Continuity checks * Check domestic and industrial contracting Hand-cranked Megohmmeter Model 1210N (pdf) 12/05 Rev. 03 Technical Assistance (800) 343-1391 www.aemc.com 2 of 4 1. 2. 3. 4. Line (-) terminal Black Guard Terminal Blue Earth (+) terminal Red Instrument ground terminal for user safety 5. Green (1250N) LED indicates proper crank speed and output voltage 6. Fold-away handle 7. Mechanical zero adjustment screw 8. Range selector switch 9. Red LED illuminates when reading needs to be multiplied 10 to obtain the true value (M, k, ranges) 10. Security finger rest isolates users hand from terminals while facilitating a firm grip during an operation Test leads, clips and test probe are included Detachable soft carrying case. The case attaches to the carrying strap. ORDERING INFORMATION CATALOG NO. Megohmmeter Model 1250N (Hand-cranked, 250V, 500V, 1000V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Cat. #1326.02 Includes carrying strap with lead pouch, three color-coded leads, ground lead, two alligator clips, test probe and user manual Hand-cranked Megohmmeter Model 1210N (pdf) 12/05 Rev. 03 Technical Assistance (800) 343-1391 www.aemc.com 3 of 4 Contact Us United States & Canada: Chauvin Arnoux(R), Inc. d.b.a. AEMC (R) Instruments 200 Foxborough Blvd. Foxborough, MA 02035 USA (508) 698-2115 * Fax (508) 698-2118 www.aemc.com Customer Support - for placing an order, obtaining price & delivery: customerservice@aemc.com Sales Department - for general sales information: sales@aemc.com Repair and Calibration Service - for information on repair & calibration, obtaining a user manual: repair@aemc.com Technical and Product Application Support - for technical and application support: techinfo@aemc.com Webmaster - for information regarding www.aemc.com: webmaster@aemc.com South America, Central America, Mexico, Caribbean, Australia & New Zealand: Chauvin Arnoux(R), Inc. d.b.a. AEMC (R) Instruments 15 Faraday Drive Dover, NH 03820 USA (978) 526-7667 * Fax (978) 526-7605 export@aemc.com www.aemc.com All other countries: Chauvin Arnoux SCA 190, rue Championnet 75876 Paris Cedex 18, France 33 1 44 85 45 28 * Fax 33 1 46 27 73 89 info@chauvin-arnoux.com www.chauvin-arnoux.com Hand-cranked Megohmmeter Model 1210N (pdf) 12/05 Rev. 03 Technical Assistance (800) 343-1391 www.aemc.com 4 of 4