The Extech MG325 features a rugged design for heavy duty use. The MG325 measures Insulation Resistance, AC/DC Voltage, Frequency, Leakage Current, Low Resistance, Continuity, and Capacitance. Insulation Resistance tests are automatic ranging with 5 test voltages from 50V to 1000V. The MG325 can store and recall up to 99 measurements. The Extech MG325 is suitable for measuring the insulation resistance.
Extech MG325 Features:
- DC and True RMS AC Voltage Measurments to 600V
- CAT IV-600V safety rating
- Insulation Resistance Measurements up to 200G
- Frequency of the AC Voltage
- Leakage Current Insulation test mode
- Capacitance Measurements
- Low Resistance and Continuity Measurements with ZERO function
- Auto Ranging measurments
- Polarization Index (PI) and Dielectric Aborption Ratio (DAR) tests
- Five (5) Insulation Resistance test voltages (50, 100, 250, 500, and 1000V)
- Insulation Resistance tests in 10% voltage steps (from 50% to 120% of range)
- Eight (8) Insulation Resistance measurement ranges (automatic ranging)
- Pass/Fail Comparator function for Insulation Resistance and Continuity
- Auto-discharge at end of test
- Output voltage alert light and display symbols
- Hand’s free test lock feature Manually store and recall up to 99 readings
- Overload indication
- Remote test probe for controlling the TEST button remotely
- Test leads, alligator clips, batteries, user manual, and case included
| Extech MG325 Specifications : | ||||||||||
| Function | Range | Resolution | Accuracy | |||||||
| DC Voltage | ±600V | 0.01V to 1V | ±(2.0% reading + 3 digits) | |||||||
| AC Voltage | 0~600V | 0.01V to 1V | ±(1.5% reading + 5 digits) | |||||||
| Specified from 5% of range to 100% of range | ||||||||||
| Input impedance: 10MΩ Frequency 45~400Hz (unspecified for frequency >400Hz) Input protection: 600V DC and AC rms |
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| Frequency | 45~1kHz | 0.1Hz | ±(0.1% reading + 3 digits); 45~450Hz | |||||||
| Frequency measurements are shown for ACV tests in the auxiliary display area Measurements 450Hz~1kHz are for reference only; accuracy not specified | ||||||||||
| Continuity | 0.01~100Ω (@ 20mA test current) |
0.01~0.1Ω | ±(1.5% reading + 5 digits) | |||||||
| 0.01~100Ω (@ 200mA test current) |
0.01~0.1V | ±(1.5% reading + 4 digits) | ||||||||
| Continuity threshold 30Ω (programmable ON/OFF continuity buzzer) Open Circuit Voltage: 5V approximately |
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| Resistance | 0.001k~10MΩ | 0.001kΩ.~ 0.1MΩ | ±(3.0% reading + 3 digits) | |||||||
| Capacitance | 0.1nF~500µF | 0.1nF~0.1µF | ±(5.0% reading + 5 digits) | |||||||
Insulation Resistance Measurements |
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| Test Voltage | Range | Min. Resolution | Accuracy | |||||||
| 50V | 0.00M~0.99GΩ 1.00G~10.0GΩ |
0.01MΩ ~ 0.01GΩ 0.01GΩ ~ 0.1GΩ |
±(3% + 3 digits) ±(3% + 3 digits) reading; ±4%/GΩ |
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| 100V | 0.00M~0.99GΩ 1.00G~20.0GΩ |
0.01MΩ ~ 0.01GΩ 0.01GΩ ~ 0.1GΩ |
±(3% + 3 digits) ±(3% + 3 digits) reading; ±2%/GΩ |
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| 250V | 0.00M~0.99GΩ 1.00G~50GΩ |
0.01MΩ ~ 0.01GΩ 0.01GΩ ~ 0.1GΩ |
±(3% + 3 digits) ±(3% + 3 digits) reading; ±0.8%/GΩ |
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| 500V | 0.00M~0.99GΩ 1.00G~100GΩ |
0.01MΩ ~ 0.01GΩ 0.01GΩ ~ 0.1GΩ |
±(3% + 3 digits) ±(3% + 3 digits) reading; ±0.4%/GΩ |
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| 1000V | 0.00M~0.99GΩ 1.00G~200GΩ |
0.01MΩ ~ 0.01GΩ 0.01GΩ ~ 0.1GΩ |
±(3% + 3 digits) ±(3% + 3 digits) reading; ±0.2%/GΩ |
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| Short-circuit current < 2mA 250V DC and AC rms input limit |
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Insulation Resistance Test Voltage Outputs |
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| Output Voltage | Test Steps (50~120%) | Load | Overload | Test current | Short-circuit current | |||||
| 50V (0%~+20%) | (25~60V) | 50kΩ | 250VAC/DC | 1mA | ≤2mA | |||||
| 100V (0%~+20%) | (50~120V) | 100kΩ | 250VAC/DC | 1mA | ≤2mA | |||||
| 250V (0%~+20%) | (125~300V) | 250kΩ | 250VAC/DC | 1mA | ≤2mA | |||||
| 500V (0%~+20%) | (250~600V) | 500kΩ | 250VAC/DC | 1mA | ≤2mA | |||||
| 1000V (0%~+20%) | (500~1200V) | 1MΩ | 250VAC/DC | 1mA | ≤2mA | |||||
| Operating range per EN61557: 0.10MΩ~1.00GΩ (output voltage >/= 50V) Short-circuit current: 2mA (0%~50%) Leakage current accuracy: ± (10% + 3 digits) Test voltage output step range is 50%~120% in 10% steps |
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| Note: Accuracy is stated at 23°C (75°F) and 45~75% RH. | ||||||||||
| Note: Calibration interval: 1 year maximum | ||||||||||
| Note: Temperature coefficient: 0.1 x stated accuracy/°C | ||||||||||
| Note: Accuracy specifications consist of two elements: | ||||||||||
| · (% reading) This is the accuracy of the measurement circuit. | ||||||||||
| · (+ digits) This is the accuracy of the analog to digital converter. | ||||||||||
General Specifications |
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| Display 5999 count, backlit, LCD with bargraph | ||||||||||
| Ranging Automatic | ||||||||||
| Storage capacity 99 records (01-99) | ||||||||||
| Input Impedance >10MΩ | ||||||||||
| AC Response True rms | ||||||||||
| ACV Bandwidth 45Hz to 400Hz | ||||||||||
| Over range indication “>” is displayed in Insulation Resistance and Continuity modes | ||||||||||
| Auto Power Off After 10 minutes of inactivity | ||||||||||
| Polarity Automatic (no indication for positive); Minus (-) sign for negative | ||||||||||
| Measurement Rate 2 times per second, nominal | ||||||||||
| Low Battery Indication “ ” is displayed if battery drops below operating voltage | ||||||||||
| Battery Six (6) 1.5V ‘AA’ batteries | ||||||||||
| Consumption 500mA (at a 1000V test voltage); 17mA in nominal conditions | ||||||||||
| Fuse 500mA/600V fast blow | ||||||||||
| Enclosure Double molded, IP 40
Operating Temperature 0ºC~40ºC (32ºF~104ºF) Storage Temperature -20°C~60°C (-4°F~140°F) Operating Humidity <85% |
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| Storage Humidity <90% | ||||||||||
| Operating Altitude 2000m (7000ft,) maximum | ||||||||||
| Weight 0.7kg (1.5 lbs.) with batteries | ||||||||||
| Size 225[L] x 103[W] x 59[D] mm (8.8[L] x 4.1[W] x 2.3[D] in.) | ||||||||||
| Safety: This instrument is designed in strict compliance with safety standard IEC61010, overvoltage standard (CAT IV 600V) and pollution degree II. | ||||||||||
