AEMC 1000N User manual

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USER MANUAL
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- 1 -
Limited Warranty
The Megohmmeter Models 1000N and 1100N are warranted to the
owner for a period of 2yearsfrom the date of original purchase
against defects in manufacture. This limited warranty is given by
AEMC® Instruments, not by the distributor from whom it was pur-
chased. This warranty is void if the unit has been tampered with,
abused or if the defect is related to service not performed by AEMC®
Instruments.
What AEMC®Instruments Will Do: If a malfunction occurs within the 2
year period, you may return the instrument to us for repair or
replacement free of charge, provided we have your REGISTRATION
CARD on file. AEMC®Instruments will, at its option, repair or replace the
faulty material.
Note: If a registration card is not on file, we will require a dated
proof of purchase as well as your REGISTRATION CARD
accompanied by the defective material.
REGISTER ON LINE AT:
www.aemc.com
What You Must Do: First request a return authorization form by phone
or by fax from AEMC®Instruments, then return the instrument along with
the signed authorization repair form. Return material, postage pre-paid
to: Chauvin Arnoux®, Inc.
d.b.a. AEMC®Instruments
Service Department
15 Faraday Drive
Dover, NH 03820 USA
Tel: [phone] (X360)
[phone] (X360)
Fax: [phone]
Caution: To protect against in-transit loss, we recommend you insure
your returned material.
For full warranty coverage, please read the Warranty Card which is
affixed to the Warranty Registration Card. Please keep the Warranty
Card with your records.

- 2 -
Table of Contents
Warning ........................................................................................... 4
International Electrical Symbols ...................................................... 4
Megohmmeter Model 1000N......................................................... 5
Receiving Your Shipment ......................................................... 5
Packaging ................................................................................. 5
Accessories and Replacement Parts........................................ 5
Description................................................................................ 6
Specifications............................................................................ 7
Control and Connector Identification......................................... 9
Battery Replacement .............................................................. 10
AC Supply Module .................................................................. 10
Operation...................................................................................... 11
The Analog Scale.................................................................... 11
Preliminary Check................................................................... 12
How to use the Push-to-Measure Button................................ 12
Utilizing the Guard Terminal ................................................... 13
Voltage Measurements (Safety Check).................................. 14
Audible Signal......................................................................... 15
Precautions When Making DC Insulation Tests ..................... 15
Insulation Measurement - Connections .................................. 16
Insulation Resistance Measurements on Motors.................... 19
Understanding Insulation Testing ............................................. 21
Types of Tests......................................................................... 22
Spot Reading Test............................................................ 22
Ratio Testing .................................................................... 22
Dielectric Absorption Test................................................. 23
Step Voltage Test............................................................. 24
Effects of Temperature ........................................................... 25
Interpreting the Results........................................................... 26

- 3 -
ESD Conductivity Test Kit Megohmmeter Model 1100N ......... 27
Receiving Your Shipment ...................................................... 27
Packaging .............................................................................. 27
Accessories and Replacement Parts...................................... 27
Description ............................................................................. 28
Specifications ......................................................................... 29
Battery Replacement ............................................................. 31
AC Supply Module ................................................................. 31
Resistance Testing of Conductive Flooring ........................... 32
Measurement Results ............................................................ 34
Maintenance................................................................................... 35
Cleaning................................................................................... 35
Repair and Calibration .................................................................. 36
Technical Assistance .................................................................... 36

Megohmmeter Model 1000N/1100N
- 4 -
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These safety warnings are provided to ensure the safety of
personnel and proper operation of the instrument.
WARNING: HIGH VOLTAGE PRESENT
•Do not attempt to perform any tests with these instruments
until you have read the instruction manual.
•Safety is the responsibility of the operator!
•Tests are to be carried out only on non-energized circuits!
Check for live circuits before making resistance
measurements (safety check).
•The Megohmmeters Models 1000N and 1100N are sources
of high voltage, as is the sample connected to them. All
persons performing or assisting in the tests must employ all
safety precautions to prevent electrical shock to themselves
and to others.
•AEMC®considers the use of rubber gloves to be an excellent
safety practice even if the equipment is properly operated and
correctly grounded.
•When testing capacitance samples, make sure that they have
been properly discharged and that they are safe to touch.
Dielectric insulation samples should be short-circuited for at
least five times the amount of time they were energized.
•Megohmmeters should never be used in an explosive
environment.
•Use the leads supplied with the megohmmeters. If they are
defective or worn, replace before testing.
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This symbol signifies that the instrument is protected by double
or reinforced insulation. Use only specified replacement parts
when servicing the instrument.
This symbol signifies CAUTION! and requests that the user refer
to the user manual before using the instrument.
Risk of electric shock. The voltage at the parts marked with this
symbol may be dangerous.

Megohmmeter Model 1000N/1100N
- 5 -
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Upon receiving your shipment, make sure that the contents are
consistent with the packing list. Notify your distributor of any missing
items. If the equipment appears to be damaged, file a claim immediately
with the carrier and notify your distributor at once, giving a detailed
description of any damage.
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The Megohmmeter Model 1000N (Cat. #185.100) is shipped with eight
1.5V “AA” batteries, two color-coded safety leads with insulated alligator
clips, a separate shielded lead, a separate insulated alligator clip, test
probe, one spare fuse, carrying case and instruction manual.
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AC power supply module with line cord and plug for
switch-selectable 110/220VAC at 47 to 400Hz.....................Cat. #100.142
Protective rubber case with handle......................................Cat. #2980.02
Rugged plastic carrying case, 19 x 14 x 7" ..........................Cat. #2118.07
Fuse, set of five, 0.1A slow-blow for AC supply module......Cat. #100.438
Fuse, set of one, 0.3A, for Model 1000................................Cat. #100.429
One test probe and one insulated alligator clip....................Cat. #100.404
Replacement leads for Models 1000N/1100N/5000N..........Cat. #1017.23
7-pin shielded lead, 10 ft, for Models 1000N/5000N/5100...Cat. #2950.10
Replacement Leads for Model 1000
Coaxial shielded lead ...........................................................Cat. #100.439
Set of leads: one coaxial shielded lead, pair of
safety leads, alligator clip, and test probe............................Cat. #100.482

Megohmmeter Model 1000N/1100N
- 6 -
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The AEMC®Model 1000N (Cat. #185.100) is a portable, multi-range,
high-sensitivity megohmmeter capable of measuring a wide range of
insulation resistances from 1 kilohm to 1000 gigohms. The Model 1000N
has five test voltages of 50, 100, 250, 500 and 1000V. Each test voltage
setting has two resistance ranges: 1 to 1000MΩand 1 to 1000GΩ.
In addition, the Model 1000N has a unique low insulation test range of 1
to 1000kΩwith a constant current of 1mA (maximum voltage of
1200VDC), which is useful for testing old or flooded installations. A
voltmeter (safety check) with a range of 0 to 600V is standard.
The Model 1000N may be powered by either AC or DC. DC power is
supplied by eight 1.5V alkaline “AA” batteries. As an option, an AC line
supply module and cord for 110/220VAC at 47 to 400Hz can be inserted
in the battery compartment.
An audible signal consisting of approximately ten beeps per minute is
present when the megohmmeter is ON, and serves as a time base for
tests of long duration. A green LED, when ON, indicates that the
batteries are good when the PUSH-TO-TEST button is depressed. It also
serves as a warning light when the instrument is in use, indicating that
the selected test voltage is present at the terminals.

Megohmmeter Model 1000N/1100N
- 7 -
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INSULATION TESTS
DC Test Voltages:
50, 100, 250, 500, 1000V
Megohm Ranges:
For each test voltage two direct reading ranges:
1 to 1000MΩ
1 to 1000GΩ
Short Circuit Current: 5mA (max)
Accuracy: 5% of reading typical
15% of reading between 100 and 1000GΩon the 50V range
Charging Time:
1000 MΩrange: 0.3 seconds/µF
1000 GΩrange: 4 seconds/µF
Discharging Time:
Automatic discharge when test button is released; 0.1 seconds/µF
Scale:
Two large overlapping scales: 4.7" (119 mm) for each range
Test Voltage Generation:
Solid state circuitry generating rated test voltage across the full range
RESISTANCE TESTS
Test Current: Constant 1mA DC
Kilohm Range: 1 to 1000kΩ(1MΩ)
Maximum Test Voltage: 1200VDC
Accuracy: 5% of reading typical
CONTINUITY TESTS
Resistance Range:
0.1 to 100Ω; 3Ωmid-scale
Accuracy: 6% of reading
Audible Tone: Continuous for continuity resistances under 200Ω
Fuse: High interrupting capacity (0.315A)

Megohmmeter Model 1000N/1100N
- 8 -
VOLTAGE TESTS (SAFETY CHECK)
Voltage Range: 0 to 600VAC/DC
Accuracy: 3% of full scale
GENERAL SPECIFICATIONS
Audible Test Signal:
Ten beeps per minute (constant tone for continuity resistance under
200Ω)
Power Supply:
Eight 1.5V “AA” alkaline batteries (NEDA 15A). Typical battery life: 350
one-minute tests; power consumed only when test button is depressed;
built-in battery check by green LED.
Option:
110/220V selectable, 47 to 400Hz AC supply module
Dielectric Test: 4000VAC, 50/60Hz, 1 minute
Fuse Protection:
0.3A high interrupting capacity fuse between line and guard terminals
Meter Movement: Rugged taut band suspension
Dimensions: 7.7 x 5.2 x 3.75" (196 x 132 x 95mm)
Weight: 2.2 lbs (1 kg)
Temperature Range: 23° to 122°F (-5° to +50°C)
Case: High impact gray polycarbonate
Terminals:
Color-coded safety terminals; guard terminal eliminates surface leakage
errors

Megohmmeter Model 1000N/1100N
- 9 -
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MEGOHMMETER
MODEL 1000N
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1. Analog Measurement Scale
2. Battery Power Indicator:
Green lamp ON indicates batteries are good when PUSH-TO-TEST
button is depressed. Audible “beep” is also emitted approximately
every 6 seconds.
3. Mechanical Zero Adjust
4. Selection Switch
5. GUARD terminal (blue):
Used to minimize the effect of leakage current.
Also used for the 10Ωrange.
6. LINE terminal (black):
Connects to the equipment to be tested.
7. EARTH terminal (green):
Connects to ground for insulation testing.
8. PUSH-TO-TEST button
Lock “ON” by turning button a quarter turn to the right.
OFF Position: Voltmeter position
ON Position: Test position with voltage present at outputs

Megohmmeter Model 1000N/1100N
- 10 -
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The Model 1000N is powered by eight 1.5V “AA” batteries. To replace
the batteries, disconnect the instrument from any circuits, verify the
PUSH-TO-TEST button is in the OFF position and proceed as follows.
•Unscrew the four standard
screws on the four corners of
the battery pack and remove
the battery pack.
•Replace the batteries, observing
the proper polarities.
•Replace the battery case, taking
care not to pinch the
connecting wire, and tighten
the four screws.
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The optional AC supply module (Cat. #100.142) provides power to the
Model 1000N at 110 or 220VAC. The AC power supply module is
designed to plug into the back portion of the instrument, directly
replacing the batteries. The module is protected by a 0.1A slow-blow
fuse.
Note: Cat. #100.142 is supplied with 110V US plug.
•Unscrew the four screws on the corners of the back panel battery
pack.
•Disconnect and remove the battery pack.
•Connect the AC supply module to the power supply connector.
•Place the AC supply module into the back of the instrument and
tighten the four corner screws, making sure not to pinch the wires of
the power supply connector.
•With the tip of a screwdriver, select the proper voltage with the
110/220 supply switch on the back panel of the AC supply module
•Plug AC supply cord into the appropriate voltage receptacle.
Access panel
Access panel
screws

Megohmmeter Model 1000N/1100N
- 11 -
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Before taking any measurements, verify that the pointer is zeroed
correctly (AC scale "0"). If it is not, adjust with the mechanical zero
adjust screw.
The analog scale serves two functions. First, it indicates the actual
resistance of the insulating material under test (black scales). The top
scale is used for measurement on the MΩand GΩranges. The bottom
half (MΩ) covers the range of 1MΩto 1000MΩ, reading from left to right
The upper portion of the scale (GΩ) covers the range of 1GΩto 1000GΩ
and reads left to right.
The center scale is used for the low insulation test range of 1kΩto
1000kΩ, reading from right to left.
The bottom arc is an AC/DC voltmeter which is divided into 10-volt
increments. The voltmeter function is operable any time the PUSH-TO-
TEST button is out. The voltmeter detects the presence of voltage on the
equipment to be tested. (If voltage is detected, do not proceed with
the insulation test.)
The voltmeter function also indicates if, after completing insulation
testing, the sample under test has stored a dangerous capacitive charge.
The instrument discharges this capacitance internally and the needle will
drop accordingly. Disconnect the meter when the sample is discharged.
Warning:
Electrical equipment and cables may have sufficient capacitance to store
a dangerous charge from the instrument test current. For proper
discharge to occur the PUSH-TO-TEST button must be in the OFF
position with the sample connected between the EARTH and LINE
terminals.
On prolonged tests, the PUSH-TO-TEST button may be locked in the ON
position; care should be taken in this mode that no damage is done if the
instrument is left unattended.

Megohmmeter Model 1000N/1100N
- 12 -
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When the PUSH-TO-TEST button is in the OFF position, the pointer
should be on zero of the voltmeter scale, and on three of the GΩscale. If
it is not, use the mechanical zero adjust on the front of the instrument.
•Detach the leads from the instrument.
•Press the PUSH-TO-TEST button into the ON position. The pointer
should deflect completely to the far right of the scale. The green neon
“Bat.” lamp should light up.
Note: Ensure that the “Bat.” light (green) does not go out at any point
during the testing. If the light does not illuminate, stop the test and
change the batteries before continuing.
Verify that NO VOLTAGE is present on the circuit to be tested.
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OFF: PUSH-TO-TEST button is in the raised position. This is for
measurement of AC or DC voltages (safety check).
Note: Do not depress the PUSH-TO-TEST button if voltage is present.
ON: PUSH-TO-TEST button is depressed and held down for the duration
of the test. This is for insulation resistance tests.
LOCK-IN: PUSH-TO-TEST button is depressed and turned clockwise
90° to lock into position. This is for insulation resistance tests of long
duration such as the Time Resistance or Absorption Test.

Megohmmeter Model 1000N/1100N
- 13 -
Utilizing the Guard Terminal
Guard terminals are useful when measuring high resistance values and
for stabilizing readings.
When testing the insulation at the end of a cable, it is necessary to
eliminate the error from surface leakage which occurs, particularly at
high resistance values. The guard terminal provides a third terminal
within the path of the surface leakage “E”. Connect the instrument as
shown in Figure 3.
Conductor
to
Line (-)
Terminal
Insulation
to
Guard
Terminal
Shield
to
Earth (+)
Terminal
Exposed
Surface
The guard terminal
is useful when
measureing very
high resistance
values.
ABCD
Figure 3
If there is no shield at “B”, use a copper wire wound several times around
the exposed surface “B”. (Note: If a shield is not available and you do not
make up a shield around
“B” and connect to the
guard terminal (-), the
measurement will be
erroneous and lead to
confusion as to the
cable’s condition.)
If the guard terminal is
not connected at “B”, the
instrument measures the
current “I” flowing through
the insulation and a
surface leakage current
“i1”. See Figure 4.
Figure 4
AC
B
Ry
Rz
Rx
i1
i
To EARTH
Terminal
To LINE
Terminal
No Connection to
Guard Terminal

Megohmmeter Model 1000N/1100N
- 14 -
When the guard terminal is connected at “B”, the instrument measures
the current “I” and not the surface leakage current “i1”, which is not
included in the measurement. See Figure 5. This type of measurement
will give the true value of
the resistance “Rx”,
providing the “Ry” and
“Rz” are not too low.
Figure 5
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Insulation resistance tests are to be carried out on non-energized circuits
only. Voltage measurements are made as a safety precaution. If any
voltage is present do not proceed with insulation resistance testing. This
instrument can measure both AC or DC voltages. For voltage
measurements, proceed as follows:
•The PUSH-TO-TEST button should be in the OFF position.
•Connect the instrument with the voltage leads connected between the
Line (-) and Earth (+) terminals on the unit.
•Read the voltage directly on the voltage scale.
+ EARTH
- LINE
MEGOHMMETER
Figure 6
AC
B
Ry
Rz
Rx
i1
i
To EARTH
Terminal To LINE Terminal
To Guard
Terminal

Megohmmeter Model 1000N/1100N
- 15 -
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When the PUSH-TO-TEST button is in the ON or LOCK-IN position, an
audible signal will result. This signal consists of approximately one beep
every six seconds (ten beeps per minute). The signal can be used as a
time base for monitoring the duration of the test. On the MΩand GΩ
ranges, the signal indicates that the instrument is in operation and that
the selected DC test voltage may be present on the terminals of the
instrument.
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•The equipment should be taken off the line sufficiently in advance to
permit it to cool to ambient temperature.
•When you are testing windings, they should be clean and dry; let
solvents and cleaners evaporate. Should foreign matter or wet
surfaces be present, erroneous readings may result. (A clean, dry
sample’s resistance may rise for 5 to 15 minutes, whereas a wet, dirty
one will stabilize quickly).
•Make sure that the equipment tested is properly discharged and
grounded before testing.
•When testing individual windings, connect all other windings (not
under test) together and ground to motor frame.
•When testing phases, be sure they are open to test each individually.
•After applying a test voltage, allow sufficient discharge time. As a rule,
discharge twice as long as tested.
Note: The instrument voltmeter will indicate the discharge voltage at the
terminals.

Megohmmeter Model 1000N/1100N
- 16 -
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Figure 7 shows the con-
nections to measure the
insulation of one conductor
to the other conductors.
The cable should be
disconnected at both ends
to avoid leakage through
switchboards and panels.
Figures 8 and 9 show the connection for testing insulation from a supply
conductor to a ground (motor frame). The connection to the guard
terminal is used to eliminate the effects of surface leakage across
exposed insulation at one end of the cable. Refer to the section “Utilizing
the Guard Terminal.” The cable should be disconnected at both ends to
avoid leakage through switchboards and panels.
+ EARTH- LINE
MEGOHMMETER
GUARD
Conductor under test
+ EARTH- LINE
MEGOHMMETER
GUARD
Conductor under test
Figure 7
Figure 8

Megohmmeter Model 1000N/1100N
- 17 -
+ EARTH- LINE
MEGOHMMETER
GUARD
Conductor under test
Figure 9
Figure 10 shows the connections to a transformer. Make sure that the
switches and/or circuit breakers on both sides are open. Check the high
voltage winding to ground, low voltage to ground, and the resistance
between them with no winding grounded.
+ EARTH- LINE
MEGOHMMETER
GUARD
Winding under test
Transformer
grounding lug
Figure 10

Megohmmeter Model 1000N/1100N
- 18 -
Figure 11 shows the connections for measuring the insulation of a three-
phase line to ground by connecting the jumpers between phases. This
gives a reading of all conductors at once. If a load such as a motor,
heater, etc., is attached to the other end of the line, it will read the load
resistance to ground at the same time. By removing the jumpers,
readings can be made between the individual conductors and ground.
+ EARTH- LINE
MEGOHMMETER
GUARD
Jumper
Jumper
A
B
C
Figure 11

Megohmmeter Model 1000N/1100N
- 19 -
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Figure 12 shows reading the
resistance to ground of a three-
phase motor winding. Since the
three-phase motors are internally
connected, it is only necessary to
connect one lead to the motor lead
and the other lead to the motor
frame as shown.
Figure 12
Figure 13 shows the
windings of a three-phase
motor separated. Some-
times this can be done at
the lead terminals while
other times the end bells
must be removed to get at
the lead wires of the coils.
By connecting the megohm-
meter as shown, the phase
insulation resistance value
can now be determined.
Read between phases “A”
and “B”, then “B” and “C”,
then “C” and “A”.
Figure 13
+ EARTH- LINE
MEGOHMMETER
GUARD
+ EARTH- LINE
MEGOHMMETER
GUARD
A
B
C