Megger IDEAL 61-791 User manual

#61-791
MEGGER®
Hand-held Insulation & Continuity Tester
99 Washington Street
Melrose, MA 02176
Fax [phone]
TestEquipmentDepot.com

SAFETY WARNINGS
✱Safety warnings and precautions must be read and
understood before the instrument is used. They must be
observed during use.
✱The circuit under test must be switched off, de -
energised and isolated before Insulation or Continuity
tests are made.
✱The test button must not be held down while connecting
the test leads or while changing ranges. (May cause
‘Live Circuit Warning‘to become inoperable).
✱The Voltage warning does not function if OFF or
is selected.
✱During an insulation test, connections must not be
touched.
✱After insulation tests, capacitive circuits must be allowed
to discharge before disconnecting the test leads.
✱Test leads, prods and crocodile clips must be in good
order; clean, and with no broken or cracked insulation.
✱Replacement fuses must be of the correct size, type and
rating.
NOTE
THE INSTRUMENTS MUST ONLY BE USED BY SUITABLY TRAINED AND COMPETENT
PERSONS.
Symbols used on the instrument:
Caution: risk of electric shock
Caution: refer to accompanying notes
Equipment protected throughout by Double Insulation (Class II)
Equipment complies with relevant EU Directives

The 61-791 has the following features:
✷1mA Insulation test current
✷200mA Continuity test with lead zeroing facility
✷Combined curved Analogue / Digital display
✷Continuity Beeper
✷Auto shut off
✷Display Back light
✷Low Battery indication
✷250 Volt Insulation
✷500 Volt
✷1000 Volt Insulation
✷Default Voltmeter
OPERATION
Preliminary Test lead check
1. Before each use of the instrument, visually inspect the test leads, prods
and crocodile clips to confirm that their condition is good, with no damaged
or broken insulation.
2. Check continuity of the test leads by firmly shorting the leads together
and read the test lead resistance. measurement directly from the display.
Backlight operation
1. Turn the instrument backlight ‘On’by selecting the position.
2. When the backlight is activated, select the desired test position.
3. On completion, select the ‘OFF’position to de-activate the backlight and
conserve battery life.
Continuity Testing
1. Turn the instrument ‘On’by selecting the Ωrange.
2. If required, zero test lead resistance by firmly shorting both leads together,
wait for the reading to stabilise and press the test button. Display of the
symbol confirms lead zeroing. Note: Lead zeroing cancels each time
the instrument is switched off, or Auto shut off operates.
3. Connect the test probes to the isolated circuit under test.
4. The display shows the resistance value. (Maximum 99,9Ω)
5. On completion switch to ‘OFF’position. Alternatively auto shut off operates
after 5 minutes of instrument inactivity.
Continuity Beeper On the position, a continuous beep note
sounds when the test leads make contact with resistance less than 5Ω. Ιf
contact is maintained, beeping ceases after a few seconds and the resistance
value is displayed. Resistance greater than 5Ωis indicated by an intermittent
beep note.
Leads
Nulled Low Battery
Fuse
Ruptured
Refer to Safety Warnings before using the instrument
DISPLAY FEATURES High
Voltage
1000V
100
200
100 M 300 10 M 400
1 M
V
100k
500
0
1 G
Default
Voltage
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
FAX [phone] - TestEquipmentDepot.com

Insulation Testing
1. Turn the instrument ‘On‘ by selecting the MΩrange.
2. Connect the test probes to the isolated circuit under test.
3. Press and hold the push button; the display shows the insulation value.The
reading will remain displayed for a few seconds after the push button is
released. As an additional safety feature, instruments with 1000V range will
flash symbol before performing a test.
4. Release the push button before removing the test leads (to enable the
instrument to discharge the circuit under test).
5. On completion switch to the ‘OFF’position. Alternatively auto shut off
operates after 12 minutes of inactivity.
SPECIFICATION
Insulation
Test Voltage Accuracy: -0% + 30% (over full operating temperature)
into 0 to 1mA load
Measuring Range: 0,01MΩ- 999MΩ(Digital)
0,1MΩ- ∞(Analogue)
Short Cct. Current: Less than 2mA
Accuracy (at 20°C): ± 3% ±2 digits up to 10MΩ
± 5% ±2 digits up to 100MΩ
± 30% up to 999MΩ
Output Noise Voltage: Typically 2V pk to pk at 20kHz (at 1mA load)
Hum Rejection: <10% error with 100µA RMS (0,2MΩto ∞)
Continuity
Measuring Range: 0,01Ω- 99,9Ω
Open Cct. Voltage: 5V ±1V
Accuracy (at 20°C): 0,01Ω- 9,99Ω±3% ± 2 digits (ISC >200mA)
10Ω − 100Ω ± 5% ± 2 digits (ISC >20mA)
Lead res. comp: 0 to 9,99Ω
Hum Rejection: <3% error with 1V RMS (0,2Ω to 50Ω)
Continuity Beeper: On position, the beeper sounds at <5Ω resistance
Environmental Conditions
Temperature Coefficient: <0,1% per °C
Temperature Range:
Operating: -20°C to +40°C (full measurement range)
-20°C to +60°C (to 100 MΩmaximum)
Storage: -25°C to +65°C
Humidity: 90% RH at 40°C max
General Specifications
Display: 3 digit L.C.D. Maximum reading 999
Auto Shut off: Operates after 5 minutes of inactivity by the
instrument in Continuity position and 12 minutes in Insulation position. Beep
notes pre-empt auto shut off. The instrument can be switched back on by
pressing the test button, or by selecting ‘OFF‘and then the required position.
Default Live Circuit Warning
When more than 25 V is applied to the terminals, the instruments default to a
1000V
100
200
300
400
500
600
700
800
900
1000
1100
1200
1300
0,01MΩ0,1MΩ1,0MΩ10MΩ100MΩ
Load
Terminal Voltage
1000 V Range
500 V Range
0.5MΩ
250 V Range
0,2MΩ0,5MΩ1MΩ2MΩ5MΩ
0,2MΩ
0,5MΩ
1MΩ
2MΩ
5MΩ
10MΩ
Minimum Indicated Value
Terminal Characteristics Limiting Value

voltmeter on all switch positions except ‘OFF’and . In addition, the beeper
will sound on all switch positions except ‘OFF‘and . All selected tests will be
inhibited except for Insulation tests, which will remain available until the voltage
exceeds 55 V.
Default Voltmeter Ranges: 25V - 450V a.c. 50/60 Hz ± 2% ±3 digits
450V - 600V a.c. 50/60 Hz ± 3%
d.c. - unspecified
Automatic Discharge: Capacitive circuits are automatically discharged
when the test button is released following an insulation test.
Power Supply: 6 x 1,5V cells IEC LR6 type only.
Battery life: Typically 3000 x 5 second operations (worst
case, with not selected).
Battery cells should not be left in an instrument which may remain unused for
extended periods of time.
Low Battery Indicator: The low battery indicator symbol will appear
when the battery cells are exhausted.
Battery Replacement: The rear cover must not be opened if the test
leads are connected. To remove the rear cover, release the screw at the
bottom of the cover and lift the cover upwards.To avoid the possibility of
shock, do not press the test button or touch the fuse when changing
batteries.
Fuse: 500 mA (F) H.B.C.10 kA min (32mm x 6mm)
To check this fuse, select MΩ, open circuit the test leads and press the test
button until a reading is obtained. Display of the fuse symbol or an error
code indicates a ruptured fuse. Located behind the rear cover, this fuse can
be replaced by the user. The rear cover must not be opened if test leads are
connected. The replacement fuse must be of the correct type and rating. To
avoid the possibility of shock, disconnect the battery before touching the fuse.
Safety: The instruments meet the requirements for double insulation to IEC
1010-1 (1995) EN 61010-1 (1995) to Category III*, 300 Volts phase to earth,
440 Volts phase to phase, without the need for separately fused test leads.
*Relates to transient overvoltage likely to be found in fixed installation wiring.
E.M.C. Meets EN 50081-1 and EN 50082-1 (1992).
Weight: 530g (including batteries)
Dimensions: 195mm x 98mm x 40mm.
Cleaning: Wipe disconnected instrument with a clean cloth
dampened with soapy water or Isopropyl Alcohol
(IPA).
ACCESSORIES
Supplied Part Number
Synthetic zip-up pouch C90
Test leads, prods & crocodile clips TL - 791

Lifetime Limited Warranty
This meter is warranted to the original purchaser against defects in material or
workmanship for the lifetime of the meter. During this warranty period, IDEAL
INDUSTRIES, INC. will, at its option, replace or repair the defective unit,
subject to verification of the defect or malfunction.
This warranty does not apply to defects resulting from abuse, neglect,
accident, unauthorized repair, alteration, or unreasonable use of the
instrument.
Any implied warranties arising out of the sale of an IDEAL product, including
but not limited to implied warranties of merchantability and fitness for a
particular purpose, are limited to the above. The manufacturer shall not be
liable for loss of use of the instrument or other incidental or consequential
damages, expenses, or economic loss, or for any claim or claims for such
damage, expenses or economic loss.
State laws vary, so the above limitations or exclusions may not apply to you.
This warranty gives you specific legal rights, and you may also have other
rights which vary from state to state.
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
FAX [phone] - TestEquipmentDepot.com