Instruction manual Compact Insulation resistance tester with 4-range KEW MEG series MODEL 3315･3316 KYORITSU ELECTRICAL INSTRUMENTS WORKS,LTD.
Contents 1．Safety warnings ……………………………………………………１ 2．Features ……………………………………………………………３ 3．Specification ………………………………………………………４ 4．Instrument layout …………………………………………………８ 5．Preparation for measurement 5−1 Mechanical zero adjustment ………………………………９ 5−2 Test lead connection ………………………………………９ 5−3 Battery voltage check ………………………………………10 5−4 Power-on-indication LED …………………………………10 6．Measurement 6−1 AC voltage measurement …………………………………10 (Mains disconnection check) 6−2 Insulation resistance measurement ………………………12 6−3 Con
１．Safety warnings ○ This instrument has been designed, manufactured and tested according to IEC 61010-1: Safety requirements for Electronic Measuring apparatus, and delivered in the best condition after passed the inspection. This instruction manual contains warnings and safety rules which must be observed by the user to ensure safe operation of the instrument and retain it in safe condition. Therefore, read through these operating instructions before using the instrument.
DANGER ¡Never make measurement on a circuit in which the electrical potential exceeds AC/DC600V(Measurement CAT. III 600V). ¡Do not attempt to make measurement in the presence of flammable gasses. Otherwise, the use of the instrument may cause sparking, which can lead to an explosion. ¡Never attempt to use the instrument if it's surface or your hand are wet. ¡Be careful not to short-circuit the power line with the metal part of the test leads when measuring a voltage. It may cause personal injury.
２．Features MODEL3315 and 3316 are four-range insulation resistance testers for testing low-voltage installation below 600V. ¡Designed to following safety standards: IEC 61010-1, IEC 61010-031, IEC 61557 ¡Small and light weight. ¡Auto-discharge function When insulation resistance like a capacitive load is measured, electric charges stored in capacitive circuits are automatically discharged after measuring. Discharge can be checked with the meter.
３．Specification ¡Applicable standards IEC 61557 IEC 61010-1 Measurement CAT.III 600V Pollution degree2 Protection class II Location for use: altitude 2000m or less IEC 61010-031 IEC 60529 IP40 ¡Measuring range and accuracy MODEL 3315 MODEL 3316 125V 50V 1000V 250V 500V Nominal voltage Max. effective 20MΩ 10MΩ 50MΩ 100MΩ 2000MΩ scale value Mid-scale value 0.2MΩ 0.5MΩ 50MΩ 1MΩ 2MΩ Accuracy in primary 0.01∼ 0.02∼ 2∼ 0.05∼ 0.
Operating error (B) is an error obtained under the nominal operating conditions, and calculated with the intrinsic error (A), which is an error of the instrument used, and the error (En) due to variations. According to IEC61557, the maximum operating error should be within +/-30%. Ｂ ＝︱Ａ︱＋ 1.
Temperature & humidity range Storage temperature & humidity range Response time Insulation resistance Withstand voltage Overload protection MODEL Insulation resistance AC voltage : 0℃ ∼ 40℃ (RH: 85% or less) (no condensation) : -20℃ ∼ ＋60℃ (RH: 75% or less) (no condensation) : Meter reading comes within accuracy within 3 sec. after a resistance corresponding to the mid-scale value and 0Ω is suddenly applied across the measuring terminals. (It may take time when measuring a capacitive load.
Optional MODEL7115 Extension probe MODEL8016 Pickle type prod Pickle type prod Extension probe ―7―
４．Instrument layout Fig.
５．Preparation for measurement 5−1 Mechanical zero adjustment With the Range switch set to the OFF position and without pressing the Test button, turn the Zero adjuster with a screwdriver so that the pointer lines up with the "∞" mark on an insulation resistance scale. In case the instrument is used at the sloping place, ensure that the pointer lines up with the "∞" mark tilting the instrument to the necessary angle.
5−3 Battery voltage check (1) Set the Range switch to the BATT. CHECK position. (2) Press the Test button or Remote control switch. (3) If the meter pointer does not move to BATT GOOD, replace the batteries as shown in Section 7 "Battery replacement". Batteries have exhausted. Replace the batteries. Proceed to measurement. CAUTION Never keep the Test button pressed or locked during battery check to avoid battery power drain. 5−4 Power-on-indication LED On an insulation resistance range or BATT.
CAUTION Never press remote switch CAUTION Never press test button AC voltage measurement (Mains disconnection check) The AC voltage measurement function is available on any ranges. DANGER ¡Never make measurement on a circuit in which the electrical potential exceeds AC/DC600V in order to avoid possible shock hazard. (Refer to Section 3. "Specification, AC voltage measurement.
6−2 Insulation resistance measurement Before performing any insulation test, check the maximum voltage that may be applied to the circuit under test. Note: ¡Some circuits have an unstable insulation resistance, which causes the reading to vary during measurement. ¡The instrument may generate a high pitch tone during measurement. This is not a failure. ¡If the circuit under test has a large capacitive load, it may take some time before the final reading can be obtained.
(2) Connect Earth probe to the earth terminal of the circuit under test. If the circuit is not earthed, connect Earth probe to any appropriate conductor. (3) Connect Line probe to the circuit under test and press the Test button or Remote control switch. (4) Take the reading on the scale for the selected insulation resistance range. Connect side Earth terminal source side Circuit breaker Remote control switch CAUTION Make sure to turn Load side off the circuit breaker.
This function allows electric charges stored in the capacitance of the circuit under test to be automatically discharged after testing.Discharge can be monitored by the AC voltage reading. (6) Set the Range switch to the OFF position, and disconnect the probes from the instrument. Note: Current of about 200μA is consumed when the Range switch is at any range other than "OFF" position. Ensure that the Range switch is set to "OFF" position when not using the instrument.
6−4 Output voltage characteristics This instrument conforms to IEC61557. This standard defines that the nominal current shall be at least 1mA, and the lower limit of the insulation resistance maintaining the nominal voltage at the measurement terminal. (See the graph below.) This value is calculated by dividing the nominal voltage by nominal current. i.e., in case that the nominal voltage is 500V, the lower limit of the insulation resistance is found as follows. Divide 500V by 1mA equals 0.
6−5 Using Guard Terminal (only for MODEL3315) Shown below is an example of the insulation resistance measurement of an electric wire. If Line probe is simply connected to the wire conductor and Earth probe to the woven metal shield as shown, a measurement error will be introduced as this results in the measurement of the combined resistance of insulation resistance and the surface leakage resistance at the cut end of the electric wire.
7．Battery replacement DANGER Never open the Battery cover during a measurement. WARNING To avoid possible electric shock, remove test leads before opening the Battery cover. After replacing batteries, be sure to tighten up the screws for Battery cover. CAUTION Do not mix new and old batteries. Install batteries in correct polarity as marked inside the Battery compartment. (1) Set the Range switch to "OFF" position, and remove the test leads from the instrument.
8．Notes on Housing case and accessories 8−1 Case lid Case lid can be fit under the Housing case while making measurement. (1) Unhook and open the Case lid. (2) Turn it 180 degrees. Put the Case lid under the Housing case. (3) Hook it on to the Housing case. 8−2 Neck strap and Cord case This instrument is equipped with a strap to suspend from the neck to allow both hands to be used freely for easy and safe operation.
8−3 Test prods and replacement 1. Types of Test prods MODEL8072:Standard Test prod Used for ordinary measurement. (Attached to the Line probe at the time of purchase.) MODEL8017:Extension probe Used in difficult-to-reach situations. MODEL8016:Pickle prod (Optional) Used to hook the probe on a conductor. 2. How to replace Test prod To remove the Test prod, turn the cap of LINE probe counterclockwise. Insert the threaded end of another prod into the hexagonal hole on the probe cap as shown.
8−4 Adaptors for the Earth cord and replacement 1. Adaptors MODEL7131:Safety alligator clip Connected to the Earth terminal of the Earth terminal board. MODEL7101:Flat test bar Connected to the earth side of the outlet. 2. How to replace Adaptors To remove the adaptors, pull them out. Then firmly attach the adaptor as desired to the tip of the Earth cord.
8−5 Cleaning Meter cover This instrument is managed by our company's quality standard and is delivered in the best condition after passed the inspection. But in the dry time of winter static electricity sometimes builds up on the meter cover due to the characteristic of plastic. When static builds up on the meter cover and affects the meter reading, use a cloth damped with off-the-shelf anti-static agent or detergent to wipe the meter cover surface.
DISTRIBUTOR 08-07 92-1645A
