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MODEL 1000N
INTRODUCTION
The Model 1000N Megohmmeter is a portable instrument which is essentially intended for
performing insulation tests upon various components of electrical systems and equipment.
The instrument allows completion of measurements according to multiple voltage levels (step
voltage method), making it possible for the user to evaluate insulation quality and to plan
preventive maintenance accordingly (especially for motors).
SPECIFIC FEATURES:
• If a linear response were to be adopted for resistance and conductance, a high number of
scales would be required on account of the extent of the measuring range which must be cover
in practice, from 1 MΩ to 1000 GΩ.
The use of logarithmic response circuitry reduces the number of scales to two. Each scale
covering three decades. The accuracy is typically on the order of ± 5% over the entire range.
• Selection of the test voltages does not cause the measuring range to change. It is very easy to
determine the influence of voltage upon insulation.
• An additional range is provided to cover from 1 kΩ to 1 MΩ. This range uses a constant current
source (1 mA) to perform the measurement. The maximum open voltage is limited to
approximately 1100 V.
• A voltmeter range covering from 0 to 600 V AC or DC allows the user to verify whether or not
the circuit where the insulation must be tested is energized.
• Insulation testing and voltmeter functions are accompanied by a continuity test range from 0.1Ω
to 100Ω. The logarithmic scale provides excellent accuracy between 0.1Ω to 1Ω. A fuse is used
for overload protection in case of incorrect measuring procedures.
PRINCIPAL FEATURES:
Insulation Testing:
• Test voltages - The rotary selector switch allows the choice of five voltages:
50 V, 100 V, 250 V, 500 V, 1000 V.
• Ranges for each test voltage
MΩ: 1 MΩ to 1000 MΩ (typical accuracy: ± 5% of reading, max: ± 10% of reading)
GΩ: 1 GΩ to 1000 GΩ (typical accuracy: ± 5% of reading, max: ± 10% of reading)
KΩ: 1 KΩ to 1000 KΩ (typical accuracy: ± 5% of reading, max: ± 10% of reading)
NOTE: From 100 GΩ to 1000 GΩ, the typical accuracy is ± 10% and max. is ± 20% of
reading on the 50 V range.
4/21/2005
REPAIR AND CALIBRATION MANUAL
4
REV. 7: March 13, 2004
FILE LOCATION: Manuals - Cal. Man - 1000MAN.DOC
CAT. #185.100
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