Introduction
3454-10
DIGITAL MΩ HiTESTER
Instruction Manual
January 2012 Revised edition 11
Printed in Japan
3454C981-11 12-01H
Function Selector
LOCK Key
COMP Key
LIGHT Key
0ΩADJ Key
High-voltage
warning lamp
EARTH
Measurement
Terminal
LINE
Measurement
Terminal
MEASURE
Key
Strap Hole
test lead
Housing
Strap Hole
Sleeve stand
Sleeve stand
: Lights up when the measured value is held
during the resistance/in sulati on- resis tanc e
measurement.
: Lights up when 0Ω adjustment is made during
resistance measurement.
: Indicates that battery power is low. (during which
time accuracy cannot be guaranteed).
: Lights up when auto power save is enabled.
: Lights up when the comparator function is
enabled.
Thank you for purchasing the HIOKI 3454-10 DIGITAL MΩ HiTESTER. To
obtain maximum performance from the instrument, please read this manual
first, and keep it handy for future reference.
Initial Inspection
When you receive the instrument, inspect it carefully to ensure that no damage
occurred during shipping. In particular, check the accessories, panel switches,
and connectors. If damage is evident, or if it fails to operate according to the
specifications, contact your dealer or Hioki representative.
Preliminary Checks
• Before using the instrument the first time, verify that it operates normally to
ensure that the no damage occurred during storage or shipping. If you find
any damage, contact your dealer or Hioki representative.
• Before using the instrument, make sure that the insulation on the test leads
and connection cords is undamaged and confirm that the white or red portion
(insulation layer) inside the cable is not exposed. If a color inside the cable is
exposed, do not use the cable. Using the products in such conditions could
cause an electric shock, so contact your dealer or Hioki representative for
replacements (Model L9787).
Maintenance and Service
• T o clean the instrument, wipe it gently with a soft cloth moistened with water or
mild detergent. Never use solvents such as benzene, alcohol, acetone, ether,
ketones, thinners or gasoline, as they can deform and discolor the case.
• If the instrument seems to be malfunctioning, confirm that the batteries are
not discharged, and that the test leads and fuse are not open circuited before
contacting your dealer or Hioki representative.
• When an indication Err.9 appears, send the instrument for repair.
Specifications
General Specifications
Display Max. 4000 LCD
Sampling rate twice/second
Response time
Operating Temperature
&Humidity
Storage Temperature
&Humidity
Operating Environment Indoors, <2000m (6562-ft.) ASL
Effect of temperature
°C
0 to 18
(32 to 64°F, 82 to
104
Degree of protection IP40 (condition which the test lead is connected)
Power source
Maximum rated power 3 VA
Continuous operating
time
Additional function
Dielectric strength
Maximum input voltage
Maximum rated voltage to earth
Input error protection
for 10 second
(overvoltage protection)
, 28 to 40
°F
)
Insulation resistance (
resistance: Within 5 s, ACV: Within 2 s
°C (32 - 104°F)
0 to 40
(non-condensating)
-20 to 50
(non-condensating)
±2% of reading±5 dgt,
plus basic allowance
°C
(Resistance Measurement 4 MΩ range: ± 5% of reading
plus basic allowance)
Rated power voltage: 1.5 V DC X 4,
R6P manganese battery X 4 or LR6 alkaline battery X 4
Insulation
hours, at 125 V and 250 V for about 20 hours, at 500 V
for about 10 hours (with manganese battery)
Automatic power-saving mode, Comparator, High-voltage warning, Warning indication of false voltage input ,
Data hold, Display lighting, 500 V output error protection, Zero adjustment
5550 V AC 50/60 Hz for one minute
Between electric circuit and case
600 V AC
600 V AC
(ACV function: 800 V AC)
°C(-4 - 122°F)
∞ 0, ∞ center scale value),
, 90%RH or lower
, 90%RH or lower
∞ measurement at 50 V for about 24
Dimensions
(excluding protrusions)
Mass 530 g, 18.7 oz. approx. (including batteries)
Accessories
Options
Standards applying
rdg.:(reading value) The value currently being measured and indicated on the
measuring instrument.
dgt.:(resolution) The smallest displayable unit on a digital measuring instru-
ment, i.e., the input value that causes the digital display to show a "1".
Insulation Resistance Measurement
Rated output voltage, Effective maximum indicated value
Rated output voltage (DC) Effective maximum indica te d valu e Center scale value
50 V / 125 V 200 MΩ 5 MΩ
250 V / 500 V 2000 MΩ 50 MΩ
Display range
Rated output voltage Display range Maximum indicated value Resolution
50 V / 125 V /
250 V / 500 V
50 V / 125 V 200 MΩ range 200.0 MΩ 0.1 MΩ
250 V / 500 V
* Resistances of 1000 MΩ or higher are indicated in increments of 10 MΩ i.e.,
1010 MΩ, 1020 MΩ, etc .
Effective measuring range, Accuracy
Guaranteed for one year under conditions not exceeding 23°C±5°C (73°F±9°F)
and 90% RH
Rated output
voltage
50 V /
125 V
250 V /
500 V
Measurement terminal voltage characteristic.
Rated
output
voltage
50 V
125 V 0.125 MΩ
250 V 0.25 MΩ
500 V 0.5 MΩ
Effect of radiated radio-frequency electromagnetic field: 3 V/m, within +1 0%rdg.
Resistance Measurement
Display range, Accuracy
Guaranteed for one year under condit ions not exceedi ng 23°C±5°C (73°F±9°F)
and 90% RH.
Display range
(Auto range)
400 Ω range 400.0 Ω 0.1 Ω
40 kΩ range 40. 00 kΩ 0.01 kΩ
400 kΩ range 400. 0 kΩ 0.1 kΩ
Short circuit current: 200 mA or more, open circuit terminal voltage: 5V DC±1 V
AC Voltage Measurement
Display range, Accuracy
Guaranteed for one year under conditions not exceeding 23°C±5°C (73°F±9°F)
and 90% RH
Display range
600 V range 750 V 1 V ±3%rdg. ±6dgt.
Input resistance: 100 kΩ or more, Frequency range: 50 to 60 Hz
.
1st effective measurin g range
2nd effective measu ring rang e
other measuring range
1st effective measurin g range
2nd effective measu ring rang e
other measuring range
Open circuit voltage
(when no load is
1 to 1.2 times of
rated output voltage
40 Ω range 40.00 Ω 0.01 Ω
4 kΩ range 4. 000 kΩ 0.001 kΩ
4 MΩ range 4.000 MΩ 0.001 MΩ
175W X 148H X 56D mm approx.
6.89"W X 5.83"H X 2.20"D approx.
L9787 Test Lead, Instruction Manual,
R6P manganese battery X 4, Strap
L9787-91 Breaker Pin, 9804-02 Magnetic Adapter,
L9787 Test Lead
Safety EN61010
EMC EN61326
2000 MΩ range 2000 MΩ 1 MΩ*
Name of measuring range Measuring range Accuracy
applied)
Maximum
indicated value
Maximum
indicated value
Measurement Category III, Pollution Degree 2
(Anticipated Transient Overvoltage: 6000 V)
4 MΩ range 4.000 MΩ 0.001 MΩ
40 MΩ range 40.00 MΩ 0.01 MΩ
400 MΩ range 400.0 MΩ 0.1 MΩ
0.200 to 10.00 MΩ ±3%rdg. ±4dgt.
10.01 to 200.0 MΩ
0 to 0.199 MΩ
0.200 to 100.0 MΩ ±3%rdg. ±4dgt.
100.1 to 2000 MΩ
0 to 0.199 MΩ
Allowable no-load
voltage range
Minimum resistanc e
measurement required to
maintain the rated ou tput
voltage
0.1 MΩ
Resolution
Resolution
Accuracy
(After 0
±3%rdg. ±6dgt.
±5%rdg. ±6dgt.
Guaranteed at 600 V or less)
(
1 to 1.2 mA
Ω
Adjustment)
±5%rdg. ±5dgt.
±5%rdg. ±5dgt.
Rated
current
0.5 to 0.6
mA
Accuracy
Short circuit
current
1.2 mA or
less
Safety
\
This instrument is designed to comply with IEC 61010 Safety Standards, and has been thoroughly tested for safety prior to shipment.
However, mishandling during use could result in injury or death, as well
as damage to the instrument. However, using the instrument in a way
not described in this manual may negate the provided safety features.
Be certain that you understand the instru cti ons and precautions in the
manual before use. We disclaim any responsibility for accidents or injuries not resulting directly from instrument defects.
Measurement categor ies
This instrument complies with CAT III safety requirements.
To ensure safe operation of measurement instruments, IEC 61010 establishes
safety standards for various electrical environments, categorized as CAT II to
CAT IV, and called measurement categories.
CAT II
: Primary electrical circuits in equipment connected to an AC electrical outlet
by a power cord (portable tools, household
appliances, etc.)CAT II covers directly
measuring electrical outlet receptacles.
CAT III
: Primary electrical circuits of heavy
equipment (fixed installations) connected
directly to the distribution panel, and feeders from the distribution panel to outlets.
CAT IV
: The circuit from the service drop to the service entrance, and to the
power meter and primary overcurrent protection device (distribution panel).
Using a measurement instrument in an environment designated with a highernumbered category than that for which the instrument is rated could result in a
severe accident, and must be carefully avoided.
Use of a measurement instrument that is not CAT-rated in CAT II to CAT IV measurement applications could result in a severe accident, and must be carefully
avoided.
Safety Symbol
This manual contains information and warnings essential for safe operation of
the instrument and for maintaining it in safe operating condition. Before using
the instrument, be sure to carefully read the following safety notes.
In the manual, the symbol indicates particularly important
information that the user should read before using the instrument.
The symbol printed on the instrument indicates that the user
should refer to a corresponding topic in the manual (marked with
the symbol) before using the relevant function.
Indicates that dangerous voltage may be present at this terminal.
Indicates a double-insulated device.
Indicates AC (Alternating Current).
Indicates DC (Direct Current).
The following symbols in this manual indicate the relative importance of cautions and warnings.
Indicates that incorrect operation presents an extreme hazard that
could result in serious injury or death to the user.
Indicates that incorrect operation presents a significant hazard that
could result in serious injury or death to the user.
Indicates that incorrect operation presents a possibility of injury to
the user or damage to the instrument
Indicates advisory items related to performance or correct operation
instrument.
.
of the
Usage Notes
Follow these precautions to ensure safe operation and to obtain the full benefits of the various functions.
Observe the following precautions to avoid electric shock.
• Be sure to disconnect the test lead from the object to be measured
and turn the function switch OFF before connecti ng or dis connecti ng
the test lead from the MΩ HiTESTER.
• Always verify the appropriate setting of the function selector before
connecting the test leads.
Disconnect the test leads from the measurement object before
switching the function selector.
• Do not use the instrument where it may be exposed to corrosive or
combustible gases. The instrument may be damaged or cause an
explosion.
• Do not use the instrument where it may be exposed to oil, chemicals,
or solvents. Contact with these substances may cause cracking in the
instrument, resulting in damage or electric shock.
• Do not allow the instrument to get wet, and do not take measurements
with wet hands. This may cause an electric shock.
• Do not use any other electrical source other than the batteries. The
use of any other sources may result in damage of the instrument or
the object to be measured and also may cause electric shock.
• Before using the instrument, make sure that the insulation on the test
leads and connection c or ds is undam a ge d and confirm that the whit e
or red portion (insulation layer) inside the cable is not exposed. If a
color inside the cable is exposed, do not use the cable. Using the
products in such conditions could cause an electric shock, so cont act
your dealer or Hioki representative for replacements (Model L9257).
• If the protective functions of the instrument are damaged, either remove it
from service or mark it clearly so that others do not use it inadvertently.
• Disconnect the test leads from the measurement object before switching
the function selector.
• This instrument is designed for use indoors. It can be operated at temperatures between 0 and 40°C without degrading safety .
• Do not store or use the instrument where it could be exposed to direct sunlight, high temperature or humidity, or condensation. Under such conditions, the instrument may be damaged and insulation may deteriorate so
that it no longer meets specifications.
• For safety reasons, when taking measurements, only use the L9787 Test
Lead (or optional) provided with the instrument .
• To avoid damage to the instrument, protect it from physical shock when
transporting and handling. Be especially careful to avoid physical shock
from dropping.
• Calibration and repair of this
the supervision of qualified technicians knowledgeable about the dangers
involved.
• Removable sleeves are attached to the metal pins at the ends of the test
leads.
• To prevent an electric shock accident, confirm that the white or red portion
(insulation layer) inside the cable is not exposed. If a color inside the cable
is exposed, do not use the cable.
• To prevent a short circuit accident, be sure to use the test leads with the
sleeves attached when performing measurements in the CAT III measurementcategory. The test leads can be used with the sleeves removed when
taking measurements in the CAT I and CA T II measurement categories. For
details on measurement categories, see "Measurement categories" in the
instruction manual.
To avoid battery depletion, turn the function selector OFF after use (the Auto
Power Save feature consumes a small amount of current).
instrument should be performed only under
Names and Functions of Parts
1. Function Selector
Selects among power ON/OFF, the output voltage for insulation resistance
measurement, ACV, or resistance (Ω).
2. MEASURE Key
Used to measure resistance and insulation resistance. This key remains ON
while it is held down.
3. LOCK Key
Used to measure resistance and insulation resistance. This key switches ON
if held down for more than 2 seconds. Press the key again to turn it OFF.
4. COMP Key
Used for the comparator function
5. LIGHT Key
Turns the display light ON/OFF. The light automatically switches OFF after
30 seconds.
6. 0ΩADJ Key
Used for the zero-adjust function in resistance measurement
Used when "500 V" is selected in insulation-resistance measurement
Used to select the buzzer sound in the comparator function
7. High-voltage warning lamp
Begins flashing if the input voltage exceeds AC 70 V (±10 V) and during
insulation resistance measurement.
8. EARTH Measurement Terminal
Connect the black test lead to this terminal.
9. LINE Measurement Term in al
Connect the red test lead to this terminal.
10.Strap Hole
Pass the strap through this hole.
11.Test lead Housing
Houses the test leads. The test leads may be housed
without disconnecting them from the terminals after use.
12.Sleeve stand: Attach the sleeve removed from the tip of the test lead.
Display Block
: Lights up when the measured value is less than the criterion for the comparator
function during insulation-resistance measurement, or when the measured value
is greater than the criterion during resistance measurement.
: Lights up when the measured value is equa l to or greater than the criterion for the
Source
(primary side)
Load
(secondary side)
Caution: Always turn off the breaker
of the measurement line.
1. For safety, set the function selector to OFF and remove
the test lead from the instrument.
2. Loosen the screw located at the center of the back of the
instrument and remove the battery cover.
3. Replace all four batteries or fuse.
4. Reinstall the battery cover and fasten the screw.
comparator function during i ns ula tion-resistance measurement, or when the measured value is equal to o r les s than the criterion during resistance measurement.
: Lights up when the criterion for the comparator function is indicated.
: Lights up when "500 V" is selected, if the 0ΩADJ key has not been pressed.
: Lights up when the LOCK key is pressed to perform continuous measure-
ment of insulation resistance or resistance.
: Indicated during insulatio n-r esistan ce mea sure me nt, or beg i ns flashi n g when the
input voltage exceeds AC 70 V (
: Overflow indicator. Indicated when the measurement exceeds the effective maxi-
mum indicated value.
±10 V).
Measurement Procedures
Pre-measurement inspection
Ensure that the test leads are not disconnected
1. Use the function selector to select Ω function.
2. Short the test lead tips.
3. Confirm that the reading is below 1 Ω when pressing the MEASURE key.
Insulation Resistance Measurement
To select 500 V, set the function selector to 500 V while pressing the 0ΩADJ
key.
: Overflow indication
An abbreviation for overflow, the display OF is analogous to a ∞ indication in an
analog insulation tester. When measurements are larger than the effective
maximum indicated values of each function, the display will indicate .
[Measurement example] When the display indicates in the 500 V function,
measurements are detected as larger than 2000 MΩ. When nothing is connected to the test lead, is also displayed.
Display Function
50 V
125 V
250 V
500 V
To avoid electri c shock, always verify the appropriate setting of the
function selector before connecting the test leads.
• When measuring insulation resistance, dangerous voltage is applied
to the measurement terminals. To avoid electric shock, do not touch
the test lead.
• Never touch the object being measured immediately after measuring.
There is a danger of electric shock from the change accumulating during high voltage testing. (See Discharge Function)
• Discharge the subject conductor after measurement.
• Do not attempt to measure insulatio n resistance on a live conductor.
Doing so could damage the instrument or cause an accident that
might result in injury or death. Always turn off power to the conductor
being measured before starting.
Preparing for Measurement
1. Set the function selector to 50 V, 125 V , 250 V, or 500 V. To select 500 V, set
the function selector to 500 V while pressing the 0ΩADJ key. When the
function switch is turned from OFF to 500 V, hold down the 0ΩADJ key until
"MΩ" appears on the display. If the 0ΩADJ key has not been pressed and
"500 V" is selected, appears on the display. I n this case 500 V is not
applied when the MEASURE key or LOCK key is turned on.
2. Make sure that indicator does not appear. If the indicator appears, please
replace the batteries.
3. Connect the black test lead to the measurement terminal on the earth side of
the instrument. Connect the red test lead to the measurement terminal on
the line side of instrument.
4. Connect the black test lead to the ground side of the object being measured.
Except when measuring insulated resistance between ground and the object
being measured, connect the test lead to an optional point.
5. Connect the red test lead to the object being measured.
Effective maximum
indicated value
200 M
Ω
Ω
2000 M
Measuring Only While the Key is Pressed
•Start
1. Press the MEASURE key. The high-voltage warning lamp begins flashing,
and the indicator appears on the display.
2. Read the measurement after it has stabilized.
•End
1. Release the MEASURE key to end measurement. The current
measurement is automatically held.
2. When the object to be measured must be discharged, read and follow t he
instructions given under "Discharge Function" below.
Measuring without Holding the Key (Continuous Measurement)
•Start
1. Hold down the LOCK key for more than 2 seconds. The high-voltage
warning lamp begins flashing, and the i ndicator and appear on
the display.
The MΩ HiTESTER continues with measurement even if the LOCK key or
MEASURE key is not held down.
2. Read the measured value after it has stabilized.
• End (Shutdown method when is indicated)
1. Press the LOCK (STOP) key or MEASURE key to end measurement. The
current measurement is automatically held.
2. When the object to be measured must be discharged, read and follow t he
instructions given under "Discharge Function" below.
• If the object to which the test leads are connected is live, even if the MΩ
HiTESTER is not performing measurement, the high-voltage warning lamp
and indicator will flash on the display.
• Insulation resistances are unstable by nature. The readings may not stabi-
lize with some objects; this does not necessarily indicate a malfunction.
• If the object has a capacitive component, the MΩ HiTESTER may indicate a
value smaller than the actual resistance immediately after the start of measurement. The reading will gradually increase to indicate the actual resistance.
• If the function switch is turned during measurement, the MΩ HiTESTER will
stop measurement.
• If is indicated even if the measurement is performed with the tip of the
test leads short-circuited, a conductor in the test leads may be broken.
• Make sure the high-voltage warning lamp off first, and then select the Resis-
tance Measurement functions or OFF.
• Some objects ma y req ui re ti me u nti l the me asu rem ent s are st ab le. (App ro x. 5 s ec. )
Discharge Function
When measuring an insulation resistance that contains a capacitance element,
a charge proportional to the rated output voltage accumulates, and if undischarged could lead to an electric shock accident.
1. End measurement without disconnecting the test leads from the object.
2. The built-in discharge circuit automatically discharges the item.
3. During discharging, the high-voltage warning lam p and indicator flash.
They will go out when the voltage falls below approximately 30 V.
4. Discharge time varies with capacity.
AC V oltage Measurement
• Test lead should only be connected to the secondary side of a
breaker, so the breaker can prevent an accident if a short circuit
occurs. Connections should never be made to the primary side of a
breaker, because unrestricted current flow could cause a serious
accident if a short circuit occurs.
• The maximum input voltage is 600 V AC. Attempting to measure voltage in excess of the maximum input could destroy the instrument
and result in personal inj ur y or de a th.
• To avoid electrical shock, be careful to avoid shorting live lines with
the test lead.
1. Set the function selector to V.
2. Connect the test lead to the instrument's measurement terminal.
3. Connect the test lead to the circuit being measured and re ad the displayed
value. Do not use the MEASURE key or LOCK key.
Resistance Measurement
Never apply voltage to test lead when the Resistance Measu rement
functions is selected. Doing so may damage the instrument and result
in personal injury. To avoid electrical accidents, remove power from the
circuit before measuring.
Preparing for Measurement
1. Set the function selector to Ω.
2. Connect the test lead to the instrument's measurement terminal.
3. Connect the test lead to the object being measured.
Measuring Only While the Key is Pressed
•Start
1. Press the MEASURE key and read the displayed value.
•End
1. Release the MEASURE key to end measurement. The current
measurement is automatically held.
Measuring without Holding the Key (Continuous Measurement)
•Start
1. Hold down the LOCK key for more than 2 seconds. The appear
on the display.
The MΩ HiTESTER continues with measurement even if the LOCK key or
MEASURE key is not held down.
2. Read the measured value.
• End (Shutdown method when is indicated)
1. Press the LOCK (STOP) key or MEASURE key to end measurement. The
current measurement is automatically held.
0ΩAdjustment Function
T o indicate the resistance of the object itself, the zero-adjust function stores the
resistances of the test leads and fuse and deducts these values from measurement values.
1. Set the function selector to Ω.
2. Connect the test lead to the instrument's measurement terminal.
3. Short-circuit the metal tips of the test leads.
4. To start measurement, press the MEASURE key, or hold down the LOCK
key for more than 2 seconds.
5. Press the 0ΩADJ key. lights up, and the display indicates "0.00 Ω."
6. Connect the test lead to the object being measured.
7. Read the measured value.
• The indication can be zero-adjusted when the reading is 3 Ω or less. If the
0ΩADJ key is pressed when the reading is over 3 Ω, "Err.1" is displayed.
• If the test leads are short-circuited during resistance measurement, the mea-
surement current will exceed 200 mA, accelerating battery consumption.
Perform the zero adjustment as quickly as possible and open the circuit as
soon as the adjustment is complete.
• If is indicated even if the measurement is performed with the tip of the test
leads short-circuited, a conductor in the test leads or the fuse may be broken.
Comparator Function
The comparator function compares the measurement with a set criterion, indicates PASS or FAIL, and sounds the buzzer during resistance or insulationresistance measurement.
Using Comparator
1. Set the function selector to 50 V, 125 V, 250 V, or 500 V or Ω.
2. Press the COMP key. The COMP indicator, REF indic ator, criterion, and the
condition for sounding the buzzer ( or ) appear on the display.
The display changes to the criterion-setting screen. The criterion changes
each time the COMP key is pressed. Press the key repeatedly until the
criterion to be used is displayed.
Press the 0ΩADJ key. This switches the display between and ,
allowing you to select the criterion for sounding the buzzer. For example, if
you switch the display to , the buzzer sounds when the c omparator
result is .
3. Press the MEASURE key or the LOCK key to start measurement. The REF
indicator and the criterion go out. The display returns to the measurement
display screen. The MΩ HiTESTER compares measurements and the
criterion.
Result Indication
Insulation-resistance measurement: When the measurement is sma ller than
the criterion, is indicated. When the measurement is equal to or greater
than the criterion, is indicated.
Resistance measurement: When the measurement is greater than the criterion, is indicated. When the measurement is equal to or smaller t han the
criterion, is indicated.
Select a criterion from the presets shown in the table below.
Function
50 V / 125 V
250 V / 500 V
Ω
For example, when the function switch is turned to "250 V," every time the
COMP key is pressed, the criterion changes as follows: 0.2 MΩ 0.4
MΩ ... 2000 MΩ 0.2 MΩ ....
• When the criterion setting screen is shown (step 2 above), if the MΩ HiT-
ESTER remains idle for 2 seconds, the REF indicator, the criterion, and
ous screen. However, the COMP indicator remains on, indicating that the
comparator function is enabled.
• If power is turned OFF after the comparator function is enabled, the function
is automatically enabled when the power is turned ON again. The last criterion setting made before the power is turned OFF is also held.
0.1/0.2/0.4/0.5/1/2/3/5/10/20/30/50/100 /200 unit
0.2/0.4/0.5/1/2/3/5/10/20/30/50/100/200 /500/1000/2000 unit
0.5/1/2/3/4/5/6/10/20/50/100/200/1k unit
or are no longer displayed, and the display reverts to the previ-
Established reference value available [MΩ]
[MΩ]
[MΩ]
[Ω]
When Not Using Comparator
To disable the comparator function, hold down the
seconds. The
Automatic Power-Saving Mode
The instrument will automatically enter power-saving mode about 10 minutes
following the last operation, and all displayed values disappear.
When the power is turned ON, the auto power save function is automatically
enabled (APS lights up).
COMP
indicator goes out, and the comparator function is disabled.
COMP
key for more than 2
To Switch from Power-Saving Mode
Set the function selector to OFF before returning to the original position.
Disabling the Auto Power Save Function
While holding down LIGHT key, turn the function switch to tur n ON the power.
Options
• L9787-91 Breaker Pin
(Pin length 70 mm and 48 mm from the t ip has width 2.5 mm. The rest have
width 3.8 mm.)
Attach this to the tip of the test lead of the L9787, when otherwise it would be
too short to make a measurement. (This item does not conform to IEC 61010.)
• 9804-02 Magnetic Adapter
(
Ø11 mm Corresponding standard screw: M6 Button head screw)
Adaptor for connecting a Test lead to the round head screw by means of magnetism. The tip of adaptor is a concave shape in order to fit the round head
screw. Put an adaptor on the tip of the earth side lead of a L9787 Test Lead.
• L9787 Test Lead (1.2 m)
Replacing of Batteries and Fuse
• To avoid electric shock, turn off the function switch and disconnect
the test lead before replacing the batteries and fuse.
• After replacing the batteries or fuse, replace the cover and screws
before using the instru ment.
• Do not mix old and new batteries, or differe nt types of batteries. Also,
be careful to observe battery polarity during installation. Otherwise,
poor performance or damage from battery leakage could result.
• Battery may explode if mistreated. Do not short-circuit, recharge, disassemble or dispose of in fire.
• Handle and dispose of batteries in accordance with local regulations.
• Replace the fuse only with one of the specified characteristics and
voltage and current ratings. Using a non-specified fuse or shorting the
fuse holder may cause a life-threatening hazard.
Fuse type: 7012540 (made by SIBA Inc.), Rating 0.5 A/700 V AC, very
fast-Acting.
• To avoid corrosion from battery leakage, remove the batteries from the
instrument if it is to be stored for a long time.
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