Constant test voltage across measurement range
ensures accurate and realistic tests - True Megohmmeter
Autoranging MΩ ranges
Designed for harsh environments: offshore, 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
Four terminals including guard and ground
Large direct-reading scale
600V test voltage range (safety check)
The Model 1250N is a compact, self-contained, hand-cranked
True Megohmmeter. This practical and dependable instrument is designed for a broad range
of plant and field service applications.
The easy hand-cranked operation provides a steady, rectified DC voltage output across the
entire range for consistently reliable readings.
The Model 1250N has three test voltages for insulation resistance testing: 250, 500 and
1000V, and has a test voltage range for safety checks to confirm the sample is fully
discharged and not connected to an energized circuit.
Test voltages are generated in full
across the entire measurement range.
Applications
Acceptance testing and preventive maintenance
Motors, cables, switchgears and electrical wiring
installations
Continuity checks
Domestic and industrial contracting
Insulation Tests
Test Voltage
250VDC
500VDC
1000VDC
Measurement Range
1 to 11MΩ, 11 to 500MΩ
10 to 110MΩ, 110 to 5000MΩ
Short Circuit Current
5mA (approx.)
Accuracy
2% of full scale
Automatic Discharge
8 s/µF
Charging Time
0.2 s/µF
0.5 s/µF
Voltage Warning Indicator
Amber LED indicates proper test voltage and crank
speed
Display
Analog Display: Rugged taut band suspension
Safety Ratings:
EN61010-1, 600V, Cat. II, 1000V, Cat. I
Agency Approvals: CE Mark
General Specifications
Power Source:
Hand-cranked
Dielectric Test:
2000V 50/60Hz, between (-), (+), and ground
terminals
Dimensions:
4.7 x 4.7 x 5.1" (120 x 120 x 130mm)
Weight:
3.3lbs (1.5kg)
Temperature Range:
64° to 75°F (18° to 24°C), 30 - 50% RH
Operating Range:
14° to 122°F (-10° to 50°C), 0 - 80% RH
Storage Range:
-4°F to 176°F (-20° to 80°C), 0 - 90% RH
Case:
Cast aluminum alloy case and lod painted safety
yellow, with heavy duty gray polycarbonate front panel; O-ring sealed between fron panel
and case; sealed against water and dust; folding crank
Terminals:
"+" Line (red); "-" earth
(black); accept standard 4mm safety banana plugs; ground accepts 4mm banana plug or spade
lugs
