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UNI-T UT33B, Operating Manual

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Measurement Operation (8)

D.  Measuring Resistance 

(see figure 4)

( figure 4)

Warning

To avoid damages to the Meter or to the
devices under test, disconnect circuit
power and discharge all the high-voltage
capacitors before measuring resistance.

The Model UT33B/UT33C

: The resistance

measurement positions are: 200

Ω

, 2000

Ω

¸,

20k

Ω

, 200k

Ω

 and 20M

Ω

The Model UT33D

: The resistance measurement

positions are: 200

Ω

, 2000

Ω

, 20k

Ω

, 200k

Ω

,20M

Ω

and 200M

Ω

To measure resistance, connect the Meter as
follows:

20

Model UT33B/C/D: OPERATING MANUAL

Summary of Contents for UT33B

Page 1: ...n International Electrical Symbols The Meter structure Functional Buttons Measurement Operation A DC Voltage Measurement B AC Voltage Measurement C DC Current Measurement D Measuring Resistance E Diodes and Continuity Measurement F Temperature Measurement G Battery Test Table of Contents 1 1 Model UT33B C D OPERATING MANUAL ...

Page 2: ... DC Voltage B AC Current C DC Current D Resistance E Diodes and Continuity Measurement F Temperature G Battery Test H Square Wave Output Maintenance A General Service B Replacing the Battery C Replacing the Fuses Page 28 29 31 31 32 33 34 35 35 36 36 37 37 38 39 2 Model UT33B C D OPERATING MANUAL ...

Page 3: ... before using the Meter The Model UT33B UT33C and UT33D Multimeters hereafter referred as the Meter are 3 1 2 digits with steady operations fashionable design and highly reliable hand held measuring instrument The Meter can measure AC DC voltage AC DC Current Resistance Temperature Diode and Continuity It is an ideal tool for maintenance Except where noted the descriptions and instructions in this...

Page 4: ... or damaged part In the event you find any missing or damage please contact your dealer immediately Unpacking Inspection Item 1 2 3 4 Description Qty 1 piece 1 pair 1 piece 1 piece English Operating Manual Test Lead Point Contact Temperature Probe UT33C only Holster 4 Model UT33B C D OPERATING MANUAL ...

Page 5: ...vel special equipment or parts of equipment telecommunication electronic etc with smaller transient overvoltages than overvoltages CAT II CAT II Local level appliance PORTABLE EQUIPMENT etc with smaller transient overvoltages than CAT III Use the Meter only as specified in this operating manual otherwise the protection provided by the Meter may be impaired 5 Model UT33B C D OPERATING MANUAL ...

Page 6: ... pose hazards to the user or may damage the Meter or the equipment under test A Note identifies the information that user should pay attention on International electrical symbols used on the Meter and in this Operating Manual are explained on page 10 6 Model UT33B C D OPERATING MANUAL ...

Page 7: ... model number or electrical specifications before using the Meter l Do not apply more than the rated voltage as marked on the Meter between the terminals or between any terminal and grounding l The rotary switch should be placed in the right position and no any changeover of range shall be made during measurement is conducted to Warning To avoid possible electric shock or personal injury and to av...

Page 8: ...Meter may deteriorate after dampened l When using the test leads keep your fingers behind the finger guards l Disconnect circuit power and discharge all high voltage capacitors before testing resistance continuity diodes and current l Before measuring current check the Meter s fuses and turn off power to the circuit before connecting the Meter to the circuit l Replace the battery as soon as the ba...

Page 9: ... mild detergent should be used to clean the surface of the Meter when servicing No abrasive and solvent should be used to prevent the surface of the Meter from corrosion damage and accident l The Meter is suitable for indoor use l Turn the Meter off when it is not in use and take out the battery when not using for a long time l Constantly check the battery as it may leak when it has been using for...

Page 10: ...nal Electrical Symbols Continuity Test AC Current DC Current Double Insulated Low Battery Diode Fuse Safety Rules Conforms to Standards of European Union Earth Ground AC or DC 10 Model UT33B C D OPERATING MANUAL ...

Page 11: ...igure 1 1 LCD Display 2 HOLD Button 3 Display Backlight Button 4 Rotary Switch 5 COM Input Terminal 6 10A Input Terminal 7 Other Input Terminals The Meter Structure figure 1 11 Model UT33B C D OPERATING MANUAL 7 4 3 1 5 6 2 ...

Page 12: ...e to turn the display backlight on l Press BLUE button again to turn the display backlight off l Display backlight will NOT be automatically off unless pressing the BLUE button BLUE button l Press HOLD once to enter hold mode l Press HOLD again to exit hold mode l In Hold mode H is displayed and the present value is shown 12 Model UT33B C D OPERATING MANUAL ...

Page 13: ...ned The DC Voltage ranges are 200mV 2000mV 20V 200V and 500V To measure DC voltage connect the Meter as follows 1 Insert the red test lead into theVΩmAterminal and the black test lead into the COM terminal 2 Set the rotary switch to an appropriate measurement position in V range 3 Connect the test leads across with the object being measured The measured value shows on the display figure 2 13 Model...

Page 14: ...it is required to select a higher range in order to obtain a correct reading l In each range the Meter has an input impedance of approx 10MΩ This loading effect can cause measurement errors in high impedance circuits If the circuit impedance is less than or equal to 10kΩ the error is negligible 0 1 or less l When DC voltage measurement has been completed disconnect the connection between the testi...

Page 15: ...urement positions are 200V and 500V To measure AC Voltage connect the Meter as follows 1 Insert the red test lead into the VΩmA terminal and the black test lead into the COM terminal 2 Set the rotary switch to an appropriate measurement position in V range 3 Connect the test leads across with the object being measured The measured value shows on the display which is effective value of sine wave me...

Page 16: ...it is required to select a higher range in order to obtain a correct reading l In each range the Meter has an input impedance of approx 10MΩ This loading effect can cause measurement errors in high impedance circuits If the circuit impedance is less than or equal to 10kΩ the error is negligible 0 1 or less l When AC voltage measurement has been completed disconnect the connection between the testi...

Page 17: ...and ground is greater than 60V If the fuse burns out during measurement the Meter may be damaged or the operator himself may be hurt Use proper terminals function and range for the measurement When the testing leads are connected to the current terminals do not parallel them across any circuit Warning figure 3 17 Model UT33B C D OPERATING MANUAL ...

Page 18: ...rge all high voltage capacitors 2 Insert the red test lead into the VΩmA or 10A terminal and the black test lead into the COM terminal 3 Set the rotary switch to an appropriate measurement position in A range 4 Break the current path to be tested Connect the red test lead to the more positive side of the break and the black test lead to the more negative side of the break 5 Turn on power to the ci...

Page 19: ...ment position 10A l and reduce the range step by step until a satisfactory reading is obtained l When current measurement has been completed disconnect the connection between the testing leads l and the circuit under test Measurement Operation 7 19 Model UT33B C D OPERATING MANUAL ...

Page 20: ... power and discharge all the high voltage capacitors before measuring resistance The Model UT33B UT33C The resistance measurement positions are 200Ω 2000Ω 20kΩ 200kΩ and 20MΩ The Model UT33D The resistance measurement positions are 200Ω 2000Ω 20kΩ 200kΩ 20MΩ and 200MΩ To measure resistance connect the Meter as follows 20 Model UT33B C D OPERATING MANUAL ...

Page 21: ...obtain precision readings in low resistance measurement that is the range of 200Ω short circuit the input terminals beforehand and record the reading obtained called this reading as X X Is the additional resistance from the test lead Then use the equation measured resistance value Y X precision readings of resistance l For high resistance measurement 1MΩ it is normal taking several seconds to obta...

Page 22: ...d amages to the Meter or to the devices under test disconnect circuit power and discharge all the high voltage capacitors before diodes Warning Use the diode test to check diodes transistors and other semiconductor devices The diode test sends a current through the semiconductor junction and then measures the voltage drop 22 Model UT33B C D OPERATING MANUAL ...

Page 23: ...3D 3 For forward voltage drop readings on any semiconductor component place the red test lead on the component s anode and place the black test lead on the component s cathode The measured value shows on the display Note l In a circuit a good diode should still produce a forward voltage drop reading of 0 5V to 0 8V however the reverse voltage drop reading can vary depending on the resistance of ot...

Page 24: ... leads and the circuit under test Measurement Operation 12 The Model UT33C UT33D Testing for Continuity To test for continuity connect the Meter as below 1 Insert the red test lead into the VΩmA terminal and the black test lead into the COM terminal 2 Set the rotary switch to 3 Connect the test leads across with the object being measured The buzzer sounds if the resistance of a circuit under test ...

Page 25: ...void harms to you or damages to the Meter please do not attempt to input voltages higher than 60V in DC or 30V in AC Warning The Temperature measurement range is 40 o C 1000o C or 40o F 1832o F To measure temperature connect the Meter as follows 1 Insert the red temperature probe into the VΩmA terminal and the black temperature probe into the COM temperature figure 6 25 Model UT33B C D OPERATING M...

Page 26: ...ter when there is no temperature probe connection l The included point contact temperature probe can only be used up to 250 o C 482 o F For any measurement higher than that the rod type temperature probe must be used instead l When temperature measurement has been completed disconnect the connection between the testing leads and the circuit under test Measurement Operation 14 26 Model UT33B C D OP...

Page 27: ...ery proceed as follows 1 Insert the red test into the VΩmA terminal and the black test leads into the COM terminal 2 Set the rotary switch to an appropriate measurement position in range 3 Connect the test leads across with the battery being measured ensuring the polarity is correct The measured value shows on the display which is the voltage between the cathode and anode of the battery 27 Model U...

Page 28: ...tput To avoid damages to the Meter do not allow output terminals red test lead to reach higher than 10V Warning To measure square wave output proceed as follows 1 Set the rotary switch to OUT 2 The square wave signal outputs between VΩmA and COM Terminals Note l The frequency is approx 50Hz l The output scope higher than 3Vpp when it is loaded 1MΩ 28 Model UT33B C D OPERATING MANUAL ...

Page 29: ...rminals and Grounding 500V rms l Fused Protection for VΩmA Input Terminal 315mA 250V fast type φ5x20 mm l 10A Terminal Un fused l Range Manual ranging l Maximum Display Display 1999 l Measurement Speed Updates 2 3 times second l Temperature Operating 0 o C 40 o C 32 o F 104 o F Storage 10 o C 50 o C 14 o F 122 o F l Relative Humidity 75 0 o C 30 o C 50 31 40 o C General Specifications 29 Model UT3...

Page 30: ...Battery Deficiency Display l Negative reading Display l Overloading Display 1 l Dimensions HxWxL 130 x 73 5 x 35mm l Weight Approx 156g battery included l Safety Compliances IEC61010 CAT I 600V overvoltage and double insulation standard l Certification General Specifications 2 30 Model UT33B C D OPERATING MANUAL ...

Page 31: ...perature coefficient 0 1 x specified accuracy 1 o C Accuracy Specifications 1 A DC Voltage Remark Input impedance 10MΩ Range Resolution 200mV 2000mV 20V 200V 500V Accuracy UT33B UT33C UT33D Overload Protection 100µV 1mV 10mV 100mV 1V 0 5 2 0 8 2 250V DC or AC 500V DC or AC 31 Model UT33B C D OPERATING MANUAL ...

Page 32: ...t impedance approx 5MΩ l Displays effective value of sine wave mean value response l Frequency response 40Hz 400Hz Range Resolution Accuracy UT33B UT33C UT33D Overload Protection 200V 500V 100mV 1V 1 2 10 500V DC or AC 32 Model UT33B C D OPERATING MANUAL ...

Page 33: ... measurement 10 seconds and interval not less than 15 minutes Range Resolution 200µA 2000µA 20mA 200mA 10A Accuracy UT33B UT33C UT33D Overload Protection 1 2 2 2 5 0 1µA 1µA 10µA 100µA 10mA 315mA 250V fast type fuse φ 5x20mm Un Fused 1 2 1 2 33 Model UT33B C D OPERATING MANUAL ...

Page 34: ...Specifications 4 Range Resolution 200Ω 2000Ω 20kΩ 200kΩ 20MΩ 200MΩ Accuracy UT33B UT33C UT33D Overload Protection 0 1Ω 1Ω 10Ω 100Ω 10kΩ 100kΩ 0 8 5 1 5 0 8 2 5 reading 10 10 250V DC or AC 34 Model UT33B C D OPERATING MANUAL ...

Page 35: ...Range Resolution Remark Overload Protection 1mV Displays approximate forward voltage drop 0 5V 0 8V 250V DC or AC Accuracy Specifications 5 Range Resolution Remark Overload Protection 250V DC or AC 40 o C 150 o C 150 o C 1000 o C 40o F 302o F 302o F 1832o F 1 o C 1 o F 1 3 1 5 15 1 4 1 5 15 35 Model UT33B C D OPERATING MANUAL ...

Page 36: ...del UT33D Square Wave Output Range Illustration Approx output 50Hz square wave signal As a simple signal source with 47kΩ resistance output OUT Remark l No overload protection l Make sure voltage output of calibrated equipment level is less than 10V to avoid damages to the meter 240Ω 1 8kΩ 30Ω 36 Model UT33B C D OPERATING MANUAL ...

Page 37: ...n bar with detergent as dirt or moisture in the terminals can affect readings l Turn the Meter to OFF position when it is not in use and take out the battery when not using for a long time Do not attempt to repair or service your Meter unless you are qualified to do so and have the relevant calibration performance test and service information To avoid electrical shock or damage to the Meter do not...

Page 38: ...s which could lead to possible electric shock or personal injury replace the battery as soon as the battery indicator appears figure 8 Warning Screw To replace the battery 1 Disconnect the connection between the testing leads and the circuit under test and remove the testing leads away from the input terminals of the Meter Maintenance 2 38 Model UT33B C D OPERATING MANUAL ...

Page 39: ...d reinstall the screw C Replacing the Fuses See figure 8 Maintenance 3 To avoid electrical shock or arc blast or personal injury or damage to the Meter use specified fuses ONLY in accordance with the following procedure Warning To replace the Meter s fuse 1 Disconnect the connection between the testing leads and the circuit under test and remove the testing leads away from the input terminals of t...

Page 40: ...stall ONLY replacement fuses with the identical type and specification as follows and make sure the fuse is fixed firmly in the bracket 315mA 250V fast type φ 5x20mm 6 Rejoin the case bottom and case top and reinstall the screw Replacement of the fuses is seldom required Burning of a fuse always results from improper operation END Maintenance 4 40 Model UT33B C D OPERATING MANUAL ...

Page 41: ...41 Model UT33B C D OPERATING MANUAL ...

Page 42: ...Dong Fang Industrial Development District Hu Men Town Dongguan City Guang Dong Province China Postal Code 523 925 Headquarters Uni Trend Group Limited Rm901 9 F Nanyang Plaza 57 Hung To Road Kwun Tong Kowloon Hong Kong Tel 852 2950 9168 Fax 852 2950 9303 Email info uni trend com http www uni trend com 42 Model UT33B C D OPERATING MANUAL ...

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