Megger 210170 Specifications

EXTENDED RANGE

Insulation Resistance Testers

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Multiple test voltages

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Guard terminal to eliminate surface
leakage current

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Voltage indicating range

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Large easy-to-read scale

EXTENDED RANGE

Insulation Resistance Testers

DESCRIPTION

These Major Megger®Extended Range Insulation
Resistance Testers are the ideal instruments when high
ranges are needed for measuring insulation resistance.
Both provide excellent test voltage regulation and an
external guard terminal to eliminate surface leakage
current from the measurement. The instruments are all
electronic; they generate a regulated dc high voltage and
use low-zero-drift, high-accuracy circuits, with high current
sensitivity. Designed for portability, each is enclosed in a
molded, impact-resistance, flame-retardant case.

Both instruments are protected for connection to power
distribution systems up to 300 V Line-Ground and 500 V
Line-Line for Installation Category III. This relates to
transient overvoltage likely to be found in fixed installation
wiring.

Cat. No. 210170

This unit provides high-resistance readings up to 20,000
MΩ. It features an analog meter movement calibrated
directly in megohms, ohms and ac volts. Test voltages of
100, 250, 500 and 1000 volts dc are selected by a rotary
switch. Insulation resistance measurements up to 20 GΩ
can be made on all voltage ranges.

The unit is also equipped with a 0- to 5000-ohm continuity
range and a 0- to 600-volt ac or presence of dc voltage
measuring range. Power is supplied by an ac generator,
driven by a hand crank, through a gear train.

Cat. No. 210600

This digital, autoranging model provides insulation
resistance readings up to 1999 MΩ. It has a 0- to 600-volt
ac measuring range. Test voltages of 100, 250, 500 and
1000 volts dc are selected by a rotary switch, and
insulation resistance to 1999 MΩ autoranging can be made
on the 500 and 1000 V ranges. It incorporates a 3-1/2 digit
LCD calibrated directly in megohms, ohms and ac/dc volts.

APPLICATIONS

Major Megger testers measure the insulation resistance of
wires, power cables, motors, generators, transformers,
switchboards and electrical controls. Both models offer
multiple test voltages for performing spot and step-voltage
tests. Typical applications include:

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Acceptance testing at time of installation to check
conformance to specifications.

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Routine preventive maintenance testing after installation.

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Quality assurance testing by the manufacturer.

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Diagnostic testing to isolate faulty components for
repair.

Major Megger insulation testers can be used for detecting
high- or low-resistance grounds, short circuits in apparatus,
cables, wiring, etc. whether caused by moisture, oil, dirt,
corrosion, damage to insulation or natural deterioration.
They can also be used to determine the presence of
moisture, solvents and semiconducting foreign materials in
wires, cables and other conductors, and in built-up
insulation systems such as those found in motor windings.

EXTENDED RANGE

Insulation Resistance Testers

Typically, these testers are used to take a series of
measurements over a period of time which will show the
gradual decline that takes place in the insulation during its
operational life. Such monitoring enables the user or to
anticipate future performance and to plan ahead for
repairs. They are also used to show improvements in the
insulation of motor, transformer and generator windings
that result from drying-out procedures used after exposure
to excessive humidity or water.

FEATURES AND BENEFITS

• Guard terminal to eliminate surface leakage current
from the measurement

• High-resistance readings up to 20,000 MΩ (analog
model)

• Digital autoranging with readings up to 1999 MΩ (digital
model)

• Multiple test voltages

SPECIFICATIONS

Cat. No. 210170

Insulation Range

Accuracy: ±3% of scale length
Test Voltage: ±5%
Short-circuit Current: 220 mA nominal on all ranges
Scale Length: 3.08 in. (78 mm)

Low Resistance Range

Accuracy: ±3% of scale length
Test Voltage: 3 V ±5%
Short-circuit Current: 30 mA ±10%
Scale Length: 3.08 in. (78 mm)

Default Voltage Range

0 to 600 V ac/dc accuracy ±2.5% of scale length

Discharge

Capacitive circuits are automatically discharged when the “TEST”
button is released following an insulation test.

Temperature Range

Operating: 14º F to 122º F (-10º C to +50º C)
Storage: 4º F to 158º F (-15º C to +70º C)

Humidity

Operating: 70% RH at 68º F (20º C); 50% RH at 104º F (40º C)
Storage: 95% RH at 95º F (35º C)

Cat. No. 210600

Insulation Range

Accuracy (73.4º F ±3.6º F):

<500 MΩ: ±3% ±2 digits
500 to 1999 MΩ: ±5% ±2 digits

Temperature Coefficient:

<500 MΩ: <86º F, ±0.06% per ºF;

>86º F ±0.14% per ºF

500 to 1999 MΩ: < 86º F ± 0.11% per ºF;

>86º F ±0.28% per ºF
Test Voltage: ±5% at open circuit
Short-circuit Current: 1.2 mA nominal

Hum Resistance

Within twice the normal accuracy if the noise current does not
exceed 1 mA for the 1-kV range, or 0.5 mA for the other ranges,
and is within 45 to 65 Hz.

Low Resistance Range

Accuracy: ±2% of reading ±1 digit
Temperature Coefficient: ±0.06% per ºF
Maximum Test Voltage: 4.3 V nominal
Short-circuit Current: 2.75 mA nominal

Default Voltage Range

0 to 600 V ac/dc
Accuracy: ±2% of reading ±1 digit at 45 to 65 Hz
Temperature Coefficient: ±0.06% per ºF
Input Impedance: 300 kΩ to 1 MΩ depending on input voltage

Display

3-1/2 digit LCD. Maximum reading 1999.

Battery Life

Typically 2100 x5 second operations

Discharge

Capacitive circuits are automatically discharged when the “TEST”
button is released following an insulation test.

Temperature Range

Operating: 23º F to 122º F (-5º C to +50º C)
Storage: 4º F to 158º F (-15º C to +70º C)

Humidity

Operating: 70% RH at 68º F (20º C); 60% RH at 95º F (35º C);
50% at 104º F (40º C) for measurements <200 MΩ
Storage: 95% RH at 95º F (35º C)

O/C Test Insulation

Voltage Resistance Resistance Power Voltage

Cat. No. (V dc) Range (MΩ) Range Source Range Dimensions Weight

210170 0 to 20,000 0 to 5000 Ω Hand 8.25 H x 5 W x 5 D in.

(at 3 V dc) cranked 210 H x 125 W x 125 D mm
100 0 to 600 V ac 2.2 lb
250 0 to 199.9 at 0.01 to 1.999 kΩ 6 AA or presence 7 H x 5 W x 5 D in. (.98 kg)

210600 500 all test voltages cells of dc 180 H x 125 W x 125 D mm

1000 2.00 to 19.99 kΩ (1.5 V)

0 to 1999 at (at 4.3 V dc

500 and 1 kV Open Circuit)