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YOKOGAWA
Instruction Manual
2426A Digital Insulation Tester
YOKOGAWA ELECTRIC CORPORATION
Headquarters 9-32, Nakacho 2-chome, Musashino-shi, Tokyo, 180 JAPAN Telex : 02822-327 YEW MT J Measuring Instruments Sates Dept. Shinjuku Nomura Bldg. 1-26-2 Nishi Shinjuku, Shinjuku-ku, Tokyo, 163-05 JAPAN Phone : 03-3349-1015 Fax : 03-3349-1017 Branch Sales Offices Nagoya, Osaka, Okayama, Fukuoka, Sapporo, Sendai, Ichihara, Kanazawa, Toyoda, Kobe, Hiroshima, Takamatsu and Kitakyusyu. Overseas Representative Office / Service Centers Beijing, Shanghai (The People's Republic of China)
YOKOGAWA ELECTRIC ASIA PTE. LTD.
11 Tampines Street 92, Singapore 1852, SINGAPORE Phone : 65-783-9537 Fax 65-786-6650 Telex : R587-26137 YASSIN
YOKOGAWA ELECTRICA DO BRASIL IND, E COM. LTDA.
Praca Acapulco, No.3.1 Parque Industrial Jurubatuba, CEP 04675 Santo Amaro-Sao Paulo, SP BRAZIL Phone : 55-11-548-2666 Telex : 38-1157755 YOKO BR Fax : 55-11-522-5231
YOKOGAWA MEASURING INSTRUMENTS KOREA CORPORATION
(City Air Terminal Bldg. 407/408) 159-6 Samsung-Dong , Kangnam-ku, Seoul, KOREA Phone : 82-2-551-0660 to -0664 Fax : 82-2-551-0665
Thank you for purchasing the YOKOGAWA 2426A Digital Insulation Tester. To optimize all the functios of the instrument, please read this manual thoroughly before operating it.
YOKOGAWA CORPORATION OF AMERICA
Headquarters
2 Dart Road, Newnan, Ga. 30265-1094, U.S.A. Phone : 1-404-253-7000 Fax : 1-404-251-2088 Branch Sales Offices / Santa Fe Springs, Mentor, Murrietta, Houston, San Jose, Chagrin Falls, Elk Grove Village, Cypress, Hope Valley
YOKOGAWA AUSTRAUA PTY. LTD.
Head Office Private mail bag 24, Centre Court D3, 25-27 Paul Street North. North Ryde,
N.S.W.2113, AUSTRALIA Phone : 61-2-805-0699 Fax : 61-2-888, 1844
YOKOGAWA EUROPE B. V.
Headquarters Radiumweg 30, 3812 RA, Amersfoort, THE NETHERLANDS Phone : 31-33-641611 Fax : 31-33-631202 Disk No. BA01 1st Edition: September 1994 (YG) All Rights Reserved, Copyright 1994, Yokogawa Electric Corporation
· IM I
YOKOGAWA BLUE STAR LTD.
Headquarters 40 / 4 Lavelle Road Bangalore 560 001, INDIA Phone : 91-812-211513 Fax 91-812-214270 Telex : 81-8458702 YKCO IN
Branch Sales Offices / Maarssen (Netherlands), Graz (Austria), Antwerpen (Belgium), Bus (France), Herrsching (Germany), Bucks (United Kingdom), Milano (Italy), Madrid (Spain), Bronby (Denmark), Espoo (Finland), Athens (Greece), Oslo (Norway), Lisboa (Portugal), Solna (Sweden), Uitikon (Switzerland)
YOKOGAWA
1. Safety Precautions
IM 242605-01E
lat Edition
Jan. '94
Printed in Japan , 409(YG)
3. Measuring Insulation Resistance · Connecting Probes
Remove the plug while
n
· General definitions of safety symbols used on the instrument and in the manuals
to avoid injury, death, or damage to the instrument, the operator must refer to the explanation in the manual. indicates danger of high voltage. Never touch this area. This safety symbol is provided in areas where a voltage of 1000 V or higher is output. indicates that an A.C. current or A.C. voltage is present. 'WARNING! A WARNING sign denotes a hazard. It calls attention to a procedure, practice or condition, which, if not correctly performed, adhered to, or maintained, could result in injury or death. ICAUTION I A CAUTION sign denotes a hazard. It calls attention to a procedure, practice or condition, which, if not correctly performed, adhered to, or maintained, could result in damage to, or destruction of part of the product. WARNING 1. Before removing the probe from the instrument, make sure that the probe is not in contact with the object under test Removing the probe while it is in contact with the object under test may cause an electric shock. 2. Never apply a voltage of 300 V or higher between the LINE and EARTH terminals, otherwise damage to the instrument or an electric shock may result. 3. Never measure insulation resistance while a votage is applied to the object under test, otherwise burns to the instrument or an electric shock may result. 4. A high voltage is still present in the probe immediately after the end of measurement, so watch out for electric shocks. 5. Do not touch any part between the LINE and EARTH terminals or between the GUARD and EARTH terminals since the measuring voltage is present and may result in an electric shock. 6. Before measuring an A.C. voltage, make sure that the function selector switch is set in the "AC V" position. Applying a voltage while the switch is satin an incorrect position may cause an electric
Insert a line probe into the LINE terminal and an earth probe to the EARTH terminal until a click sound can be heard. The plug of each probe is so constructed that it fits on the latch of the instrument to prevent loosening.
· Removing a Probe
holding down the H probe lock release button.
1.Make sure that the function selector switch is in the "OFF- position. 2. While holding down the probe lock release button, remove the probe plug.
· Operating Switches and Keys
To prevent mis-operation, the MEAS, DATA-HOLD, LIGHT and COMPARATOR keys are effective only when they are pressed on their right sides.
· Measuring Insulation Resistance
LÎ
1.Set the function selector switch to the voltage (rated voltage) to be applied to the object under test. 2. If the object is grounded, connect the clip of the earth probe to the grounding side of the object. This step is not compulsory if the object is not grounded. 3. Contact the line probe to the object, then press the MEAS key. The measured insulation resistance value will be displayed in the display section. Take care not to allow the lead wire of the line probe to come into contact with the ground, floor or other objects, otherwise correct measurement will be hindered. After measurement has been completed, make sure the function selector switch is set to the "OFF- position.
· Comparator Measurement
shock. 7. Since the GUARD terminal is subjected to an A.C. voltage during measurement of A.C. voltage, the GUARD terminal lead should never be connected to the GUARD terminal during measurement of A.G. voltage, otherwise burns to the instrument or an electric shock may result. 8. Do not apply any voltage between the measuring terminals during a continuity test, otherwise burns to the instrument or an electric shock may result. 9. Before removing the bottom cover to replace the batteries, make sure that the probe is not in contact with the object under test and the function selector switch is set in the "OFF" position, otherwise an electric shock may result. 10.Before removing the battery case cover to replace the batteries, make sure that the probe is not in contact with the object under test and the function selector switch is set in the "OFF" position, otherwise an electric shock may result. 11.The fuse must meet the requirements (rated current, rated voltage and type) given in the specifications.
CAUTION1 1. Do not change over the function selector switch during measurement, otherwise damage to the
Comparator measurement mode allows you to set the reference resistance value for measurement of insulation resistance, and an alarm is output if the measured value is lower than this reference value. Each time the COMPARATOR key is pressed while the MEAS key is held down, the reference resistance value changes from 0.1MS2 to 0.2M1 0.4MS and soon. -2, -2 The following step can set the reference resistance value to the measured value. Press the COMPARATOR key with the probe in contact with the object of the reference resistance value. The measured value obtained when the setting is changed from 0.4MS2 to XMS2 will be stored as the reference resistance value. If the function selector switch is set to another range, the stored reference resistance value will be invalidated. When the measured value drops below the reference value, the LOW mark lights up and the buzzer sounds. - In 11th case of an insulation check for a circuit having large static capacitance, the LOW mark lights up and the buzzer sounds [ at the beginning of the check due to the current charged in the static capacitor. However, the LOW mark will disappear and the buzzer will stop when the measured insulation resistance value exceeds the reference value. In comparator measurement mode, the reference value is displayed if the MEAS key is OFF, or the measured value is displayed if the MEAS key is ON. To cancel comparator measurement mode, keep pressing the COMPARATOR key for a few seconds.
· Locking the MEAS Key
The MEAS key can be locked in the ON position by pulling the MEAS key to the right. This is useful when you perform measurement continuously for a long period of time. However, this will quickly shorten the life of the batteries.
· Measuring Only the Volume Resistance of an Object
instrument or the object under test may result. 2. Changing the measuring range while the MEAS key is ON (i.e. while a high voltage is generated) or immediately after the key is turned OFF may cause an unspecified voltage to the object under test. After a lower rated voltage is selected, wait two to three seconds before starting measurement, otherwise damage to the instrument or the object under test may result. 3. Changing the measuring range while the instrument is connected to the object under test may cause damage to the instrument as well as to the object. 4. Leakage from spent batteries may cause a damage to the instrument.
2. Name of Each Part Probe Lock Release Button · Earth Terminal Hot-Line/HighVoltage Alarm Display Section ·
In the example of a cable insulation check, shown on the right, wind a bare conductor around an insulated object and contact it with the optional guard terminal lead connected to the GUARD terminal. Leakage current on the surface of the object will not flow in the display section, thus only the volume resistance of the object can be measured. To use the GUARD terminal, an optional lead (type: 321803) is required.
4. Measuring an A.C. Voltage
etY,
Power
Source rce Instrument Proper
Core Wire
LINE
Bare Wire Insulating
Material
EARTH
Metal-Sheath
Line Terminal Probe Lock Release Button Guard Terminal Earth Line Terminal Terminal
242edi
The instrument can also be used to measure KC. voltage of the commercial frequency. It is also possible to check that no voltage is applied to the object under test during measurement of insulation resistance. 1.Connect a probe in the same way as that for measurement of insulation resistance. 2. Set the function selector switch to the "AC V" position. 3. Contact the probe to the KC. voltage measurement section and read the value shown in the display section. For measurement of an KC. voltage, do not press the MEAS key.
5. Continuity Check
Fuse
Connect a probe in the same way as for measurement of insulation resistance, then set the function selector switch to the
MEAS Key DATA-HOLD Key LIGHT Key COMPARATOR Key
"
Function Selector Switch Bottom Cover Bottom Cover Screw
position. The buzzer will sound if the circuit resistance is below the threshold level. The continuity check range is protected by a fuse (0.25 A/250 V).
6. Other Functions · Holding the Measured Value
Display Section a Low b SLEEP
c DATA.H d
e Bar graph
oo
SHORT
Lights up when the measured value is lower than the a preset value during comparator measurement. Switches to the low-consumption mode automatically LEE DATA -n GICHIEBEICSINI- d if no key or switch is operated for more than 10 minutes after this mark is displayed. (Refer to "Auto Powerdown" of Section 6, "Other Functions". : Lights up when display is put on hold by the DATAHOLD key. Indiates that the batteries have run out. Replace the batteries with new ones if this mark is displayed. (Refer to Section 7, "Replacing the Batteries".) : Indicates that the measured insulation resistance value (3 digits) is shown in a bar graph. : Lights up when the measured value is higher than the following values. Effective maximum scale value 2000MQ : 4000M11 Effective maximum scale value 200MS2 : 400M12 -. Lights up when the measured value is approximately below the following values. Effective maximum scale value 2000MS2 : 0.1MS2 Effective maximum scale value 200MQ :
Pressing the DATA-HOLD key during measurement of insulation resistance will put the measured value on hold. Pressing the same key again cancel this hold function. "DATA·H" is displayed while the hold function is active. This function is not available during comparator measurement.
· Illuminating the Display Section
Pressing the LIGHT key turns the light of the display section ON. Pressing the same key again turns the light OFF. The light goes out automatically approximately 10 minutes after the last depression of a key or switch (except for the LIGHT key). The light will not be turned ON if the function selector switch is in the "OFF' position.
· Auto Power-down (Low-consumption mode)
rmnnnnO, g-
The instrument switches to low-consumption mode automatically approximately 10 minutes after the last operation of a key or switch (except for the LIGHT key). In this low-consumption mode measurement will not be done. If the function selector switch is switched from "OFF" to any mode or the rated voltage, the SLEEP mark will be displayed above the display section. If an elapse of about 9 minutes occurs after the last operation of a key during display of the SLEEP mark, the buzzer will sound and the SLEEP mark blinks for approximately one minute, then the entire display section blinks and low-consumption mode is activated. Pressing any key or switch, except the LIGHT key, will restore normal mode. To prevent low-consumption mode being activated, hold down the DATA-HOLD key and set the function selector switch to "ON". Make sure that the DATA-HOLD key is held down until the SLEEP mark is not displayed. To restore low-consumption mode, set the function selector switch to "OFF", then to "ON". The batteries (those supplied with the instrument) last for approximately 3 weeks if low-consumption mode is used.
· Alarm in case of Hot line or High Voltage
f
HV
: Lights up when the MEAS key is ON.
: Lights up when the COMPARATOR key is pressed. (Refer to "Comparator Measurement" of Section 3, "Measuring Insulation Resistance".) h Displays the current function. i Displays the measured value.
g COMP
The LED located at the top right of the instrument lights up if a voltage is applied to between the LINE and EARTH terminals. The following alarm(s) is present if the LED is lit. · Hot-line alarm This alarm occurs if an KC. voltage of approximately 40 V or higher is applied to the measurement terminals. · High-voltage alarm This alarm occurs ifs D.C. voltage of approximately 40 V or higher is generated between the measurement terminals when the MEAS key is pressed.
7. Replacing the Batteries
The (+ -1 mark in the display section indicates that the batteries have run out. Replace the batteries as described below. 1. Make sure that the function selector switch is in the "OFF" position. 2. Using a coin or similar loosen the bottom cover screws by turning them, and slide the bottom cover in the direction illustrated to remove it. 3. Replace all 8 batteries with new ones. Pay attention to the polarity of each battery when installing the new ones and make sure that they are installed in the correct direction as shown on the battery holder. 4. After all the batteries have been replaced, put the bottom cover in its original position and tighten the bottom cover screws.
Effect of temperature
Variations in readings are tested by lowering the ambient temperature to 0°C and raising it to 40°C from 20°C. Variations in relation to the value displayed when the ambient temperature is 20°C shall be within 2.5% of the displayed value at the maximum and minimum scale of the first effective measuring range and the central scale. The specified tolerances shall be met after the tester has been left under the standard test
Effect of humidity
conditions with relative humidity of 90% for one hour. Effect of external magnetic field Within 3% of central reading when tested by applying a D.C. magnetic field (400 A/m) in the most effective direction. A.C. component in measuring Within 10% of reading when tested with a capacitor of 5 1..tE ±10% connected in series terminal voltage Insulation resistance while a resistance equivalent to the central scale reading is connected to the tester or when tested with no capacitor connected. 242607 At least 50 Nis-2 when tested by applying 1000 VDC between the elec242608 Spare Fuse Replace This Fuse Vibration proof Withstand voltage trical circuit and casing At least 50 MO when tested by applying 500 VDC between the electrical circuit and casing The tester shall withstand a voltage of 3700 VAC applied between the electrical circuit and casing for one minute. The vibration proof shall be tested by applying a vibration with a frequency of 16.7 Hz and a peak-to-peak amplitude of 4 mm for one hour. The tester shall be free of electrical or mechanical damage and meet the specifications for tolerance. Shock proof Endurance Shock proofing shall be tested by applying an impact of magnitude 1000 Ws' twice in each of the three directions. The tester shall meet the specifications for tolerance. Endurance shall be tested by turning the power switch on and off repeatedly 10,000 times at a rate of approximately 300 times per hour, with a resistance equivalent to the central scale reading connected between the measuring terminals. The tester shall meet the specifications for tolerance. The tester shall be free of any defects after the following A.C. voltages are applied between the measuring terminals. A.C. voltage (sine-wave or similar, 50 or 60 Hz) of 1.2 times the rated measuring voltage for 10 seconds 360 VAC for one minute Continuity check 250 Vpeak for one minute Operating temperature/humidity range Batteries Battery alarm External dimensions 50MQ Weight Fuse -10 to 50°C, within 90%RH (no condensation) Storage temperature/humidity -20 to 60°C, within 70%RH (with batteries removed, no condensation) R6, "AA" 1.5V (8 batteries) The (Ti alarm mark lights up when the battery voltage drops below 9 ±0.5 V. Refer to the external dimensions. Approx. 700 g (including batteries) Approx. 1.3 kg (including hard case, earth probe, line probe and batteries.) 0.25AT250V 50-20 mm (one spare fuse is provided inside the tester) Function 5 MD 242607 5 MD 242608 5 MD 1000V 500 V 250V ACV/.1)) 500V 250 V 100V ACV/.t) MEAS OFF MEAS ON Maximum Approx. 290 mA Approx. 215 mA Approx. 185 mA Increase when illumination is ON
8. Replacing the Fuse
Replace the fuse as described below. 1. Make sure that the function selector switch is in the "OFF' position. 2. Loosen the bottom cover screws and remove the bottom cover in the same way as you replaced the batteries. 3. Replace the fuse with a spare one.
9. Maintenance
· Storage Conditions · Temperature/humidity: -20 to 60°C, within 70%RH · Never store the instrument in any of the following places. In damp places, in direct sunlight, near heat resources, places where level of vibration is high, where an excessive amount of dirt, dust or salt is present, where corrosive gases are present · Cleaning the Instrument Cleaning the instrument with volatile solvent such as thinner and benzine may cause discoloration. Dampen a piece of cloth with water or alcohol, then wipe the instrument. · Calibration Interval Yearly : Periodical calibration is recommended for correct instrument use. For calibration, please contact your nearest YOKOGAWA representative, listed on the back cover of this manual.
Inadequate input test
10. Specifications
· Insulation Resistance (Standard Test Condition/ambient temperature: 23 ±5°C, relative humidity: 45 to 75%) Model 242607 Rating 250V /200 MD 500 V /2000 MR 1000 V /2000 MD Range .4000 4.000 40.00 200.0 4.000 40.00 400.0 2000 4.000 40.00 400.0 2000 .4000 4.000 40.00 200.0 .4000 4.000 40.00 200.0 .4000 4.000 40.00 200.0 Resolution .1 kfl 11,D . 10 kill 100 K2 1 kill 10 ItO 100 kf2 1 MO 1 ksz 10 IcS2 100 K2 1 MD .1 kS2 I kg-2 10 ic.Q 100 l(S2 .1 kn 1 kO 10 ILO 100 ItS1 .1 kii2 1 kki2 101d/ 100 kO Measuring range 0 to .0499 MD .0500 to 20.00 MD. 20.01 to 200.0 MR 0 to 0.999 MO 1.000 to 500 MD* 501 to 2000 MG 0 to 1.999 2.000 to 1000 MO* 1001 to 2000 IVID 0 to .0199 MD .0200 to 10.00 10.01 (0 200.0 MG 0 to .0499 MQ .0500 to 20.00 MCI. 20.01 to 200.0 MQ 0 to .0999 MQ .1000 to 50.01140. 50.1 to 200.0 MO Tolerance ±(5% of rdg + 6 dgt) 1 of rdg + 1 dgt) -12% ±5% of rdg ±15% of rdg + 6 dgt) ±12% of rdg + I dgt) -1,5% of rdg -±(5% of rdg + 6 dg) ±12% of pig + 1 dgt) ±5% of rdg ±(5% of rdg + 6 dgt) ±(2% of rdg + 1 40 ±5% of rdg -±(5% of rdg + 6 dgt) ±(2% of rdg + 1 dgt) ±5% of rdg ±(5% of rdg + 6 dgt) ±(2% of rdg + I dgt) ±5% of rdg Central reading 5M2
50 win
Power consumption (for reference: battery voltage 12 V)
242608
100V /200 MD 250 V /200 Mil 500V /200 MD
Approx. 14 mA Approx. 80 mA Approx. 45 mA 14 mA 14 mA Approx. 33 mA 14 mA 14 mA 14 mA 14 mA 14 mA Approx. 45 mA Approx. 35 mA Approx. 35 mA
Approx. 8 mA
Approx. 160 mA Approx. 115 mA Approx. 115 mA
Approx. 8 ntA
During auto power-down Approx. 2 mA Accessories (numbered items are supplies) ±2% of rdg + 1 dgt ±5% of rdg and ±(5% of rdg + 6 dgt) 6 digits or lower mark is lit. Approx. 4000 Mil or higher at (500 V and 1000V for models 242607) 242608) Approx. 400 MO or higher at (250 V for models 242607, and for 0 Line probe B9204FT Ci Earth probe B9204FW (7) Hard case B9204BP · Instruction manual IM242605-01E Optional Accessories Name ® Probe tip Model/Part number B960OGN B9600NW B9600NX B9600NY B9600NZ B9635JK B960ONV B9204FX 321803 Description No.1 General-purpose No.2 With a hook No.3 For extension No.4 Elastic No.5 Pointed Pickax-shaped
ON NW NX NY NZ
--=02
Measured resistance * First effective measuring range Second effective measuring range Deviation from zero Bar graph
Name · Battery
Model/Part number Quantity Description
R6P
8
Contained in the main unit (AA or equivalent)
This manual rut
J
No-load voltage Rated measuring current Model 242607 Rating 250V/200 MD 500V/2000 win 1000V/2000 MD 100V/200 MG 250V/200 MG 500V/200 MD
Within 130% of the rated voltage -10% to +20% of 1 mA in the first effective measuring range Minimum measuring resistance that can maintain the rated current 0.25 MD 0.5 MD MD 0.1 MD 0.25 MD 0.5 MD Rated current I mA mA* 1 rnA* 1 mA 1 mA 1 mA
r=
(8 1
)
(15)
0 Probe tip storage bag
(:) Test lead with a probe Lead for guard terminal
Ci
Digital OL 2000 to 1600 1599 to 1100 10991o1000 999 to 900 899 to BOO 799 to 700 699 to 600 599 to 360 400.0 to 310.0 309.9 to 210.0 209.9 to 160.0 159.9 10 110.0 109.9 to 100.0 99.9 to 90.0 89.9 to 80.0 79.9 to 70.0 69.9 to 60.0 59.9 to 36.0 40.00 m 31.00 30.99 to 21.00. 20.99 to 16.00 15.99 to 11.00 10.99 to 10.00 9.99 to 9.00 8.99 to 8.00 7.99 to 7.00 6.99 to 6.00 5.99 to 3.60 4.000 to 3.100 3.099 10 2.100 2.0991o1.600 1.599 to 1.100 1.099 to 1.000 0.999 10 0.990 0.899 to 0.800 0.799 to 0.700 0.699 to 0.600 0.599 to 0500 0.499 to 0.400 0.399 10 0.300 0.299 10 0.100 0.099 to 0.000 0.099 (0 0.000 Maximum display value 200 MG Bar graph . 200 150 100 90 80 70 60 50 40 30 20 15 10 9 8 7 6 5 4 3 2 1.5 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.15 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0 SHORT Digital OL 200.0 to 160.0 159.9 to 110.0 109.9 to 100.0 99.9 to 90.0 89.9 to 80.0 79.9 to 70.0 69.9 to 60.0 59.9 to 36.0 40.00 to 31.00 30.99 to 21.00 20.99 to 16.00 15.99 to 11.00 10.99 to 10.00 9.99 to 9.00 8.99 to 8.00 7.99 (0 7.00 6.99 to 6.00 5.99 to 3.60 4.000 to 3.100 3.099 to 2.100 2.099 to 1.600 1.599 to 1.100 1.099(0 1.000 0.999 to 0.900 0.899 to 0.800 0.799 to 0.700 0.699 (0 0.600 0.599 to 0.500 .4000 to .3100 .3099 10 .2100 .2099 to .1600 .1599 to .1100 .1099 to .1000 .0999 to .0990 .0899 to .0800 .0799 to 0700 .0699 to .0600 .0599 to .0500 .0499 to .0400 .0399 to .0300 .0299 to .0100 .0099 to .000 .0099 to .000
242608
· Relation between Bar Graph and Digital Display Maximum display value 2000 fop Bar graph .. 2000 1500 1000 900 800 700 600 500 400 300 200 150 100 90 80 70 60 50 40 30 20 15 10 9 8 7 6 5 4 3 2 1.5 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0 SHORT
* 0.55 mA in the first effective measuring range Short-circuit current Within 12 mA
· A.C. Voltage Measurement (48 to 200 Model 242607 300V 242608 · Continuity Check IV Range 300V
Hz)
Input impedance Approx. 20 MD Approx. 12 MD
Resolution Accuracy IV ±(I.5% of rdg + 6 dgt) ±(I.5% of rdg + 6 dgt)
Open voltage Approx. 4 V Buzzer sounds to give a warning if the threshold level is below 50 ±150. · Specifications Measuring method Measurement functions Display Input over Range change-over Double integral method Insulation resistance (MO). A.C. voltage (ACV), continuity check Liquid crystal (3.5 digits) Maximum display value 4000, logarithmic bar graph (42 segments) "OL" is displayed if the measured value exceeds 2000 (200.0). MO: Fully auto range Range-up Shifts to the next higher range when the input value exceeds "4000r Range-down Shifts to the next lower range when the input value drops below 360. ACV, continuity check: Single range Approx. 2/sec (displayed in digital), approx. 20/sec (displayed in bar graph) 242607/242608: LCD back-lit by EL Auto power-down High-voltage alarm LED Hot-line alarm LED Comparator function The display starts to blink after an elapse of approximately 10 minutes following the last operation, then low-consumption mode is activated. Lights up in case of an high-voltage. However, it does not light up if the EARTH terminal is short-circuited with the LINE terminal. Lights up if an A.C. voltage of approximately 40V or higher is applied to the measurement terminals. "LOW" lights up and the buzzer sounds ifs value lower than 0.1 MO, 0.2 MO, 0.4 MO or the preset value is displayed. Display 0 to 99 dgt 100 to 199 dgt 200 to 4000 dgt Response time Hysteresis 0 dgt ±5 dgt )
Sample rate Illumination
· Measuring Terminal Voltage Characteristic
7 600 500 400 300 200
· External Dimensions
Unitrnm 65
50 3
±10 dgt The time required until the displayed value reaches the tolerance after resistances equivalent to the central and zero scale readings are connected to the measuring terminals. Digital display Bar graph Within 3 sec Within 1.5 sec (until the display stabilizes.) For digital display, the moving average value of a total of 4 sampling data is displayed.
Moving averaging
Measuring Rees.. (MO)
For bar graph display, the moving average value of a total of 8 sampling data is displayed.