Sealey MM20 Instruction Manual - Page 3

5. specifications DC VOLTAGE Range Accuracy Resolution 200mV 2V 20V 200V 600V ±0.5% of reading ±2 digits ±0.8% of reading ±3 digits ±0.8% of reading ±3 digits ±0.8% of reading ±3 digits ±0.8% of reading ±5 digits 100µV 1mV 10mV 100mV 1V Overload protection: 220V rms AC for 200mV range and 600V DC or 600V rms AC for other ranges. AC VOLTAGE Range 200V 600V Accuracy ± 2% of rdg ± 2 digits ± 2% of rdg ± 2 digits Resolution 100mV 1V Overload protection: 600V DC or 600V rms AC. Response: Average responding, calibrated in rms of a sine wave. Frequency range: 40Hz - 400Hz RESISTANCE Range Accuracy Resolution 200Ω ±0.8% of reading ±5 digits 0.1Ω 2kΩ ±0.8% of reading ±2 1Ω digits 20kΩ ±0.8% of reading ±2 10Ω digits 200kΩ ±0.8% of reading ±2 digits 100Ω 2MΩ ±1.2% of reading ±3 1kΩ digits Maximum Open Circuit Voltage: 2.8V Overload protection: 220V rms for a maximum of 10 seconds for all ranges. TEMPERATURE Range -40°C to 400°C Accuracy ± 1.0% of rdg ± 3°C 400°C to 1000°C ± 2.0% of rdg ± 3°C Overload protection: 220V rms AC Resolution 1°C 1°C DC CURRENT Range 2mA 20mA 200mA 10A Accuracy ±1.0% of reading ±2 digits ±1.0% of reading ±2 digits ±1.2% of reading ±2 digits ±2.0% of reading ±2 digits Overload protection: 200mA/250V fuse Measuring Voltage drop: 200mV Resolution 1µA 10µA 100µA 10mA TRANSISTOR hFE TEST Range (NPN or PNP) Displaying range 0 - 1000 Test Condition Current: 10µA Vce: 3V DIODE TEST Range Description Display Approx. Voltage Drop CONTINUITY TEST Range Description Buzzes if resistance is below 70Ω 5.1. ACCURACY CACULATION Example: Test reading on 200Vdc range is 56.4V. Accuracy is ±0.8% of reading ±3 digits. Reading ±3 digit = 56.4 ±3 on the last figure i.e. 56.1 to 56.7V. ±0.8% on this range gives 56.1 - 0.8% to 56.7 + 0.8% or 55.6 to 57.1V. Therefore the actual voltage lies between 55.6 and 57.1V. Note: Accuracy is specified for a period of one year after calibration and at 23°C±5°C with a relative humidity of less than 75%. 6. maintenancei ‰ ‰ 6.1. ‰ ‰ WARNING! Before attempting to open the case, ensure that the test leads have been disconnected from measurement circuits to avoid electric shock hazard. A fuse usually only blows due to operator error. To replace the fuse, remove the protective rubber boot and the two screws from the rear of the meter. Lift off the rear cover, replace the fuse and re-assemble the tester in reverse order, ensuring that the rear cover engages with the two lugs at the top of the tester. WARNING! ALWAYS replace a fuse with one of the correct rating (200mA/250V). © Jack Sealey Limited Original Language Version MM20.V3 | Issue:5 (I) 20/10/17