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- Page 1 User Manual Industrial IP67-Rated Digital Multimeters with NIST-Traceable Calibration Model 20250-53 (4000 Count) Model 20250-54 (4000 Count, True RMS) THE STANDARD IN PRECISION MEASUREMENT 1065DGMAN_20250-53-54 Manual.indd 1 8/16/2017 10:42:05 AM...
- Page 2 Introduction Digi-Sense Industrial Digital Multimeters (model 20250-53; TRMS model 20250-54) are a must-have on your electrical tool belt—especially for those who need a rugged and reliable meter. These versatile and simple-to-use units safely measure the full range of common parameters including voltage, current, resistance, capacitance, frequency, temperature, and more.
- Page 3 • Test leads and prods must be in good order, clean, and with no broken or cracked insulation. • UK Safety Authorities recommend the use of fused test leads when measuring voltage on high energy systems. • Replacement fuses must be of the correct type and rating. •...
- Page 4 3. One type K temperature probe (model 20250-54 only) 4. One 9 V battery 5. Carrying case 6. User manual 7. NIST-traceable calibration report with data Meter Description (Model 20250-53) 1. NCV detection light 2. LCD with symbols 3. RANGE button 4. REL (Relative) button 5.
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Page 5: Symbols And Annunciators
Meter Description (Model 20250-54) 1. NCV detection light 2. LCD with symbols and analog bar graph 3. Data HOLD button 4. RANGE button 5. MODE button 6. Rotary function switch 7. 10A (positive) jack 8. µA/mA jack 9. MAX/MIN button 10. -
Page 6: Setup And Operation
Setup and Operation To turn on the instrument turn the rotary function switch from the OFF position to any measurement range. NOTE: For best battery life ALWAYS turn the rotary function switch to the OFF position when the meter is not in use. Meter has Auto power-off that automatically shuts the meter off if 30 minutes elapse between uses. - Page 7 3. Press and hold the RANGE button for 2 seconds to exit the manual ranging mode and return to autoranging. REL Button (Model 20250-53 only) The relative (REL) measurement feature allows you to make measurements relative to a stored reference value.
- Page 8 MAX/MIN Button (Model 20250-54 only) The MAX/MIN function allows the meter to capture the highest or lowest reading for later reference. 1. Press the MAX/MIN button to begin measurement. The indicator “MAX” or “MIN” will appear in the display. 2. If the “MAX MIN” messages are flashing, the instrument is in MAX/MIN mode but not recording, press the MAX/MIN button to select a mode.
- Page 9 9. To return to normal operation, press and hold the PEAK button until the “Pmax” or “Pmin” indicator switches off. 10. If the rotary function switch position is changed after a calibration, the PEAK Hold calibration must be repeated for the new function selected. BACKLIGHT Button 1.
- Page 10 4. For current measurements up to 10 A, set the rotary function switch to the 10A position and insert the red test lead banana plug into the 10A jack. 5. Press the MODE button to select “AC” or “DC” current. 6.
- Page 11 4. Touch the test probe tips to the circuit or wire you wish to check. 5. If the resistance is less than 50 Ω (20250-53) or 35 Ω (20250-54), the audible signal will sound. The display will also show the actual resistance in ohms.
- Page 12 6. The diode or junction can be evaluated as follows: a. If one reading shows a value and the other reading shows “OL”, the diode is good. b. If both readings show “OL”, the device is open. c. If both readings are very small or zero, the device is shorted.
- Page 13 Frequency or % Duty Cycle Measurements (Model 20250-53 only) 1. Set the rotary function switch to the Hz% position. 2. Press the Hz% button to indicate “Hz” in the display. 3. Insert the black lead banana plug into the negative COM jack and the red test lead banana plug into the positive Hz jack.
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Page 14: Specifications
3. If voltage is present, the NCV indicator light above the LCD will flash a bright red. Specifications Accuracy is given at 65 to 83°F (18 to 28°C), less than 70% RH. DC Voltage (Autoranging) Range Resolution Accuracy 20250-53 20250-54 20250-53 20250-54 20250-53 20250-54 400.0 mV 400.0 mV 0.1 mV... - Page 15 AC Voltage (Autoranging) Range Resolution Accuracy 20250-53 20250-54 20250-53 20250-54 20250-53 20250-54 400.0 mV 400.0 mV 0.1 mV 0.1 mV 4.000 V 4.000 V 1 mV 1 mV ±1.5% rdg ±1.0% rdg ± 3 dgts ± 3 dgts 40.00 V 40.00 V...
- Page 16 Frequency range: 50 to 400 Hz Maximum input: 400 µA AC RMS on µA range, 400 mA AC RMS on mA range, 10 A AC RMS on 10 A range Resistance (Autoranging) Range Resolution Accuracy 20250-53 20250-54 20250-53 20250-53 20250-54 20250-53 ±1.2% rdg ±0.8% rdg...
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Page 17: Diode Test
Open circuit voltage: max 0.3 V DC Overload protection: 1000 V DC or AC RMS Audible Continuity Audible threshold: Less than 50 Ω (20250-53), 35 Ω (20250-54); Test current max 1.5 mA Overload protection: 1000 V DC or AC RMS... - Page 18 Overvoltage category: CAT IV 600 V, CAT III 1000 V NOTE: These meters meet CAT III and CAT IV IEC 61010 standards. The IEC 61010 safety standard defines four overvoltage categories (CAT I to IV) based on the magnitude of danger from transient impulses.
- Page 19 Maintenance, Recalibration, and Repair Cleaning and Storage • Clean meter with a damp cloth and mild detergent when necessary. Do not use solvents or abrasives. • Store the meter in an area with moderate temperature and humidity. Battery Replacement WARNING: To avoid electric shock, disconnect the test leads from any source of voltage before remov- ing the battery door.
- Page 20 It is recommended that Digi-Sense products are calibrated annually to ensure proper function and accurate measure- ments; however, your quality system or regulatory body may require more frequent calibrations. To schedule your recalibration, please contact InnoCal, an ISO 17025 calibration laboratory accredited by A2LA.
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