#61-791
MEGGER
®
Hand-held Insulation & Continuity Tester
Probadores manuales de aislamiento y continuidad
Appareil de poche pour la mesure de l'isolement et
l'essai de la continuité
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 Ω range.
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 5
Ω is indicated by an intermittent
beep note.
Leads
Nulled
Low Battery
Fuse
Ruptured
Refer to Safety Warnings before using the instrument
DISPLAYFEATURES
High
Voltage
Default
Voltage
100
1 G
200
100 M
300
10 M
1000V
400
1 M
V
0
100k
500
Insulation Testing
1. Turn the instrument ‘On‘ by selecting the MΩ range.
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 VoltageAccuracy: -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 1mAload)
Hum Rejection: <10% error with 100µA RMS (0,2MΩ to ∞)
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)
10
Ω − 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 MΩ maximum)
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
Terminal Characteristics
Limiting Value
1000V
1300
1200
1100
1000
900
800
700
600
500
400
300
200
Terminal Voltage
100
0,1MΩ
0,01MΩ
0.5MΩ
1,0MΩ
Load
1000 V Range
500 V Range
250 V Range
10MΩ
100MΩ
10MΩ
5MΩ
2MΩ
1MΩ
0,5MΩ
Minimum Indicated Value
0,2MΩ
0,2MΩ
0,5MΩ 1MΩ
2MΩ
5MΩ