Model UT71A/B OPERATING MANUAL
Model UT71A/B: OPERATING MANUAL TABLE OF CONTENTS CHAPTER 1. 2.
Model UT71A/B: OPERATING MANUAL CHAPTER 3. 4. 2 TITLE Analogue Bar Graph Using MAX MIN Making Measurements Introduction A. Measuring Voltages B. Measuring Currents C. Measuring Resistance D. Testing for Continuity E. Testing Diodes F. Measuring Capacitance G. Measuring Frequency / Duty Cycle H. Measuring Temperature I.
Model UT71A/B: OPERATING MANUAL CHAPTER 5. 6. 7. TITLE Changing the Default Setting Introduction Selecting Setup Options Maintenance A. General Service B. Replacing the Fuses C. Replacing the Battery Specifications Safety and Compliances Physical Specifications General Specifications Feature Summary Basic Specifications Detailed Accuracy Specifications A. DC Voltage B. AC Voltage C.
Model UT71A/B: OPERATING MANUAL CHAPTER 4 TITLE D. AC Current E. Resistance F. Continuity Test G. Diode Test H. Capacitance I. Frequency J. Temperature Degrees Celsius Fahrenheit K.
Model UT71A/B: OPERATING MANUAL Chapter 1 Before You Start Overview This Operating Manual covers information on safety and cautions. Please read the relevant information carefully and observe all the Warnings and Notes strictly. Warning To avoid electric shock or personal injury, read the “Safety Information” and “Rules for Safe Operation” carefully before using the Meter.
Model UT71A/B: OPERATING MANUAL Unpacking Inspection Open the package case and take out the Meter. Check the items shown on Table 1-1 carefully to see any missing or damaged part: Table 1-1.
Model UT71A/B: OPERATING MANUAL Safety Information Rules For Safe Operation This Meter complies with the standards IEC61010 safety measurement requirement: in pollution degree 2, overvoltage category (CAT. III 1000V, CAT.IV 600V) and double insulation. To avoid possible electric shock or personal injury, and to avoid possible damage to the Meter or to the equipment under test, adhere to the following rules: CAT. III: Distribution level, fixed installation, with smaller transient overvoltage than CAT.
Model UT71A/B: OPERATING MANUAL l When the Meter working at an effective voltage over 60V in DC or 30V rms in AC, special care should be taken for there is danger of electric shock. l Use the proper terminals, function, and range for your measurements. l If the value to be measured is unknown, use the maximum measurement position. l Do not use or store the Meter in an environment of high temperature, humidity, explosive, inflammable and strong magnetic field.
Model UT71A/B: OPERATING MANUAL International Electrical Symbols Symbols used on the Meter and in this manual are explained in Table1-2. Table 1-2. International Electrical Symbols AC or DC Measurement DC Measurement AC Measurement Grounding Double Insulated Warning.
Model UT71A/B: OPERATING MANUAL Chapter 2 Getting Acquainted Turning the Meter On To turn the Meter on, turn the rotary switch from OFF to any switch setting. The automatic power off is preset to 10 minutes. From the Setup menu (see Chapter 5), you could specify a time (10 minutes, 20 minutes, 30 minutes or OFF). If you set to OFF, the Meter retains on until you turn the rotary switch to OFF or the battery becomes too weak. Battery Considerations The Meter uses one 9V Battery (NEDA 1604, 6F22, 006P).
Model UT71A/B: OPERATING MANUAL Low Battery Indication A constant battery icon ( ) in the upper left corner of the display notifies you that the batteries are low and should be replaced. Warning To avoid false readings, which could lead to possible electric shock or personal injury, replace the battery as soon as the battery icon ( ) appears The Meter Structure The Figure 2-1 shows the Meter structure. 1. LCD Display 2. Functional Buttons 3. Rotary Switch 4. Input Terminals Figure 2-1.
Model UT71A/B: OPERATING MANUAL Rotary Switch Turn the Meter on by selecting any measurement function. The Meter presents a standard display for that function. The display may also be influenced by some of the choices made in Setup. Use the blue button to select any rotary switch alternate function (labeled in blue letters). When you turn the rotary switch from one function to another, a display for the new function appears. Button choices made in one function do not carry over into another function.
Model UT71A/B: OPERATING MANUAL Table 2-1.
Model UT71A/B: OPERATING MANUAL Functional Buttons The buttons activate features that augment the function selected with the rotary switch. The buttons are shown in Table 2-2. RECALL STORE Press the button once to access the main feature (e.g. STORE). To access the first additional feature of the button (e.g. RECALL), press and hold the button for over 1 second to access this additional feature. This additional feature appears right above or on the left hand side of the appropriate keys.
Model UT71A/B: OPERATING MANUAL Table 2-2. Functional Buttons Button Description Range feature: SETUP Exit AUTO and enter MANUAL ranging. In MANUAL, select RANGE next input range. EXIT to return to AUTO. AUTO is default. Access Method Press the button once.
Model UT71A/B: OPERATING MANUAL Table 2-2. Functional Buttons Button SEND (UT71A only) RECALL STORE (UT71B only) Description Setup feature: Access Method Press the button In Setup, press to select OFF at the selection of HIGH and LOW once after entering Setup mode. Store feature: Press the button Store the current measurement value. Press EXIT to exit once. the Store feature. Recall feature: Press and hold the button for over 1 Recall the stored value. Press EXIT to exit the Recall feature.
Model UT71A/B: OPERATING MANUAL Table 2-2. Functional Buttons Button Peak HOLD HOLD Description Access Method l In Setup, each press to select the digit you want to edit. Press the button once after entering l In Recall, press to enable SEND feature (UT71B only) Setup or Recall or Store mode. l In Store, press to toggle between clearing all the stored reading or start storing reading from the current index number.
Model UT71A/B: OPERATING MANUAL Table 2-2. Functional Buttons Button Description Press to display max, min and average values. Access Method Press the button once. MAXMIN (UT71A only) Press EXIT to stop and return to current measurement mode. In Setup, each press to decrement an Option. Press the button once after entering SEND mode. SEND MAXMIN (UT71B only) Press to display max, min and average values. Press the button once. Press EXIT to stop and return to current measurement mode.
Model UT71A/B: OPERATING MANUAL Table 2-2. Functional Buttons Button Description Press to enter relative mode, the primary display shows Access Method . Press the button once. The left secondary display shows the present measurement REL value. The right secondary display shows the stored value. The primary display shows the present measurement value minus the stored value. Press EXIT to exit relative mode. In Setup, each press to increment an Option.
Model UT71A/B: OPERATING MANUAL Table 2-2. Functional Buttons Button Description Use the blue button to select any rotary switch alternate function (labeled in blue letters). Blue Button Press and hold the Button while turning on the Meter to toggle to 2000 counts for all functions. It is faster when the Meter is at 4000 counts measurement mode. After the Meter is resuming from Automatic Power Off or turn on and off again, the Meter will back to normal measurement mode (20000 counts).
Model UT71A/B: OPERATING MANUAL The Meter Functions Vs Displays Table 2-3 shows the cross reference of function and display: Table 2-3 Functions Vs Displays Function Primary Display Right Secondary Display Left Secondary Display Full range: 2, 20, 200, 1000 DCV The tested DC voltage value No display ACV The tested AC voltage value The tested frequency value: Full range: 2, 20, 200, 750 40.00kHz~ 250.
Model UT71A/B: OPERATING MANUAL Table 2-3 Functions Vs Displays Function ACµA Primary Display The tested ACµA value Right Secondary Display The tested frequency value: Left Secondary Display Full range: 200, 2000 40.00kHz~100.0kHz DCmA The tested DCmA value No display Full range: 20, 200 ACmA The tested ACmA value The tested frequency value: Full range: 200, 2000 40.00kHz~100.
Model UT71A/B: OPERATING MANUAL Table 2-3 Functions Vs Displays Function RCL Primary Display The recalled value Right Secondary Display Left Secondary Display The total number of stored value. Index number: (UT71B only) no.0001~no.0100 MAX MIN Chapter 2 Getting Acquainted – Using MAX MIN REL The present measurement value The stored value The present measurement value.
Model UT71A/B: OPERATING MANUAL Selecting the Range Press RANGE to select either a fixed range or the autorange feature. Autoranging (AUTO lighted in the display) always comes on initially when you select a new function. In autorange, the Meter selects the lowest input range possible, ensuring that the reading appears with the highest available resolution. If AUTO is already on, press RANGE to enter MANUAL ranging in the present range. You can then select the next manual range each time you press RANGE.
Model UT71A/B: OPERATING MANUAL Table 2-4. Display Features No. 1 Symbol MAX Maximum reading displayed. MIN Minimum reading displayed AVG Average reading displayed 2 3 4 Meaning No ºC, ºF (UT71B only) HµmS The sequence of the reading. Degrees Celsius (default) or Fahrenheit. H: Hour µ: Micro m: Minutes (Milli) S: Second 5 Indicates negative reading 6 The battery is low.
Model UT71A/B: OPERATING MANUAL Table 2-4. Display Features No. Symbol 8 TrueRMS 9 AC+DC Meaning Indicator for True RMS value. For DCV and DCA functions, reading represents the True RMS total of AC and DC measurements 10 ,k ,M Hz, kHz, MHz : Ohm. The unit of resistance. k :Kilohm. 1x103 or 1000 ohms M :Megaohm. 1x106 or 1,000,000 ohms Hz : Hertz. The unit of frequency in cycles/second. kHz: Kilohertz. 1x103 or 1000 hertz MHz: Megahertz, 1x106 or 1,000,000 hertz. mV, V µA, mA, A V: Volts.
Model UT71A/B: OPERATING MANUAL Table 2-4. Display Features No. Symbol 10 nF,µF, mF Meaning Farad. The unit of capacitance nF: Nanofarad. 1x10-9 or 0.000000001 farads. µF:Microfarad.1x10-6 or 0.000001 farads. mF: Millifarad. 1x10-3 or 0.001 farads. 11 Automatic power off feature is on 12 Continuity test 13 STO (UT71B only) Data store is on RCL (UT71B only) Data recall is on 14 15 16 The relative mode is on to display the present value minus the stored value.
Model UT71A/B: OPERATING MANUAL Table 2-4. Display Features No. Symbol 18 Meaning Backlight feature is on 19 HOLD Data hold mode is active 20 PEAK HOLD Peak hold mode is active 21 22 Diode test % l Frequency signal duty cycle. l 4~20mA loop current as % reading 23 24 28 OL The input value is too large for the selected range. Analogue Bar Graph Provides an analog indication of the present input, quick response.
Model UT71A/B: OPERATING MANUAL Analogue Bar Graph The bar graph provides an analogue indication of the measured input. For most measurement functions, the bar graph updates 10 times per second. Using MAX MIN The MAX MIN mode stores minimum (MIN) and maximum (MAX) input values. When the input goes below the stored minimum value or above the stored maximum value, the Meter beeps and stores the new value. Press MAX MIN to enter MAX MIN mode. The sampling time is every 2 seconds.
Model UT71A/B: OPERATING MANUAL Chapter 3 Making Measurement Introduction Chapter 3 explains how to make measurements. Most measurement functions can be selected by using the rotary switch. While letters or symbols identify primary functions; blue letters or symbols identify alternative functions. Press the BLUE button to access these alternate functions. A.
Model UT71A/B: OPERATING MANUAL To measure voltages, set up the Meter as Figure 3-1 and do the following: 1. Insert the red test lead into the V terminal and the black test lead into the COM terminal. 2. UT71A: Set the rotary switch to V or V or mV UT71B: Set the rotary switch to V or V or mV 3. Connect the test leads across with the object being measured. 4. The measured value shows on the display. AC measurement displays the True RMS value.
Model UT71A/B: OPERATING MANUAL B. Measuring Currents Warning If the fuse burns out during measurement, the Meter may be damaged or the operator himself may be hurt. To avoid possible damage to the Meter or to the equipment under test, check the Meter’s fuses before measuring current. Use proper terminals, function, and range for the measurement. Never place the testing leads in parallel with any circuit or component when the leads are plugged into the current terminals.
Model UT71A/B: OPERATING MANUAL 4. DC measurement is default, press blue button to select AC measurement. 5. Open the circuit path to be tested. Touch the red testing leads to the more positive side of the break; touch the black probe to the more negative side of the bread. Reversing the leads will produce a negative reading, but will not damage the Meter. 6. Turn on power to the circuit; then read the display. AC measurement displays the True RMS value.
Model UT71A/B: OPERATING MANUAL C. Measuring Resistance Warning To avoid harms to you, please do not attempt to input voltage higher than 60V DC or 30V rms AC. To avoid possible damages to the Meter or to the devices under test, disconnect circuit power and discharge all the high-voltage capacitors before measuring resistance. To measure resistance, set up the Meter as shown in Figure 3-3 and follow the following procedure: 1.
Model UT71A/B: OPERATING MANUAL Note l When measuring low resistance, the test leads can add 0.1 to 0.2 of error to resistance measurement. To test the leads, touch the probe tips together and read the resistance of the leads. If necessary, you can press REL to automatically subtract this value. l For high-resistance measurement (>1M ), it is normal taking several seconds to obtain a stable reading. In order to obtain precision readings, use the test lead as short as possible.
Model UT71A/B: OPERATING MANUAL Note l Open circuit voltage around –1.2V and range is 400 measurement range. l When continuity testing has been completed, disconnect the connection between the testing leads and the circuit under test and remove the test leads away from the input terminals. Figure 3-4.
Model UT71A/B: OPERATING MANUAL E. Testing Diodes Warning To avoid harms to you, please do not attempt to input voltages higher than 60V DC or 30V rms AC. To avoid damages to the Meter or to the devices under test, disconnect circuit power and discharge all the high-voltage capacitors before testing diodes. Use the diode test to check diodes, transistors, and other semiconductor devices. The diode test sends a current through the semicondutor junction, then measure the voltage drop across the junction.
Model UT71A/B: OPERATING MANUAL 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 red test lead polarity is “+” while the black test lead polarity is “- “. The measured value shows on the display. The BLUE button cycles among resistance, continuity, and diode. Note l In a circuit, a good diode should still produce a forward voltage drop reading of 0.5V to 0.
Model UT71A/B: OPERATING MANUAL F. Measuring Capacitance Warning To ensure accuracy, the Meter inside is discharged against the tested capacitor. “DIS.C” will be shown on the display when it is under discharging, this process will be quite slow. To avoid damage to the Meter or to the equipment under test, disconnect circuit power and discharge all high-voltage capacitors before measuring capacitance. Use the DC Voltage function to confirm that the capacitor is discharged.
Model UT71A/B: OPERATING MANUAL 2. Set the rotary switch to measurement mode, the Meter may display a fixed reading which is a internal distributed capacitor value. For testing less than 10nF capacitor, the tested value must subtract the internal distributed capacitor value to maintain the accuracy. To improve the measurement accuracy of small value capacitors (less than 10nF), press REL with the test leads open to subtract the residual capacitance of the Meter and leads. 3.
Model UT71A/B: OPERATING MANUAL G. Measuring Frequency / Duty Cycle Warning To avoid harms to you, please do not attempt to input voltage higher than 30V rms. To measure frequency and duty cycle, connect the Meter as Figure 3-7 and do the following: 1. Insert the red test lead into the Hz terminal and the black test lead into the COM terminal. 2. Set the rotary switch to (UT71A) or (UT71B) and press BLUE button to select the Hz measurement mode for frequency measurement or % for duty cycle measurement.
Model UT71A/B: OPERATING MANUAL Note l The requirement of Input amplitude “a” is as follows: When 10Hz~40MHz: 200 mV a 30Vrms; >40MHz: Un-specified l When Hz measurement has been completed, disconnect the connection between the testing leads and the circuit under test and remove the test leads away from the input terminals.
Model UT71A/B: OPERATING MANUAL H. Measuring Temperature (UT71B only) Warning To avoid harms to you, please do not attempt to input voltages higher than 60V DC or 30V rms AC. To measure temperature, set up the Meter as shown in Figure 3-8 and proceed the following. 1. Set the rotary switch to ºC ºF, the display shows OL. Short circuit the test leads to show the room temperature.
Model UT71A/B: OPERATING MANUAL Note l Place the Meter in an environment of 18ºC~23ºC otherwise false reading may be obtained especially in testing low temperature. l The included point contact temperature probe can only be used with temperature 230ºC below. l When temperature measurement has been completed, remove the temperature probe away from the multi-purpose socket, and remove the multipurpose socket away from the Meter. I.
Model UT71A/B: OPERATING MANUAL Chapter 4 Using Store, Recall & Send Features Introduction Chapter 4 shows you how to use stores, recall and communication features available on the Meter. Please note that Data stores and recall features are available only on the UT71B. l Storing and Clearing Readings To store readings, proceed as follows: l Press STORE once, STO and “no.xxxx” appears to confirm the operation and the left secondary display shows the current measurement reading.
Model UT71A/B: OPERATING MANUAL Recalling Stored Readings Using Send Use the following procedure to recall the stored reading: When using a Send feature, please refer to the Installation Guide of the included CD-ROM. l Press RECALL to recall the stored value and RCL appears to confirm the operation. l The left secondary display shows the index number “no.xxxx”. l The primary display shows the corresponding recalled data. l The right secondary display shows the total number of the stored data.
Model UT71A/B: OPERATING MANUAL Chapter 5 Changing the Default Setting Introduction The Meter allows you to change the default operating configuration of the Meter by changing setup options made at the factory. These settings are stored and can be changed in the Setup mode using the procedure described in this chapter. Selecting Setup Options To enter the Setup mode, turn the Meter on and press and hold SETUP button for over 1 second.
Model UT71A/B: OPERATING MANUAL Table 5-1. Setup Selections Selection HIGH Option Max. 40000; Press Press LOW 10 to select OFF OFF Over the upper limits, beeps not continuously. to select OFF OFF Over the lower limits, beeps not continuously. to select the digit you want to edit 10 mins 10 mins power off 20 20 mins power off 30 30 mins power off OFF Power off feature is disabled S1 S1 OFF 10 48 Description to select the digit you want to edit Max.
Model UT71A/B: OPERATING MANUAL Table 5-1. Setup Selections Selection Option Analogue Zero is in the left hand side. Bar Zero is in the center Graph Factory Default Description Zero is in the center It can only apply to DCV, DCI and °C/°F functions. Saving Setup Options At each setup Option, store your choice and exit setup by press EXIT, advance to the next Option by press +. To exit the Setup mode without saving the present Option, press Setup.
Model UT71A/B: OPERATING MANUAL Chapter 6 Maintenance This chapter provides basic maintenance information including battery and fuse replacement instruction. Warning 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. A. General Service l Periodically wipe the case with a damp cloth and mild detergent. Do not use abrasives or solvents.
Model UT71A/B: OPERATING MANUAL B. Replacing the Fuses Warning 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. Follow Figure 6-1 and proceed as follows to replace the Meter’s fuse: l Turn the rotary switch to OFF and remove all connections from the terminals. l Remove the 5 screws from the case bottom. l Remove the fuse by gently prying one end loose, then take out the fuse from its bracket.
Model UT71A/B: OPERATING MANUAL C. Replacing the Battery Warning To avoid false readings, which could lead to possible electric shock or personal injury, replace the battery as soon as the battery indicator “ ” appears. Make sure the test leads are disconnected from the circuit being tested before opening the case bottom. Follow Figure 6-2 and proceed as follows to replace the battery: l Turn the rotary switch to OFF and remove all connections from the terminals.
Model UT71A/B: OPERATING MANUAL Chapter 7 Specifications Safety and Compliances Maximum Voltage between any Terminal and Grounding Refer to different range input protection voltage Certification IEC 61010 CAT.III1000V, CAT.IV 600V overvoltage and Compliances double insulation standard Fused Protection for µAmA input terminal: 0.
Model UT71A/B: OPERATING MANUAL Physical Specifications Display (LCD) Digital: 20000 counts on primary display; updates 2-3 times / second. 2000 counts on two secondary displays. Analog: 40 segments; updates 10 times / second. Operating Temperature 0ºC~40ºC (32ºF~104ºF) Storage Temperature -10ºC~50ºC (14ºF~122ºF) Relative Humidity 75% @ 0ºC~30ºC below; 50% @ 30ºC~40ºC: Battery Type Electromagnetic Compatibility 9V NEDA 1604 or 6F22 or 006P.
Model UT71A/B: OPERATING MANUAL General Specifications Range Auto Polarity Auto Overloading Display OL (For UT71B only: except at 4~20mA Loop range which display HI or LO) Battery Deficiency Display 55
Model UT71A/B: OPERATING MANUAL Feature Summary Tri Digital Displays Primary: 20,000 counts Left Secondary: 2000 counts Right Secondary: 2000 counts Analogue Bar Graph Bar Graph: 40 segments, updates 10 times / second Backlight with 2 brightness levels Bright backlight for clear readings in poorly lighted areas.
Model UT71A/B: OPERATING MANUAL Basic Specifications Function Ranges / Description DC Voltage 0 to 1000V AC Voltage, True RMS 0 to 1000V, 100kHz bandwidth Basic Accuracy DC Voltage: 0.025% AC Voltage: 0.
Model UT71A/B: OPERATING MANUAL Detailed Accuracy Specifications Accuracy: ([% of reading] + [number of least significant digits), guarantee for 1 year. Operating temperature: 18ºC~28ºC Relative humidity: 75%RH A. DC Voltage 58 Range Resolution 200mV 0.01mV 2V 0.0001V 20V 0.001V 200V 0.01V 1000V 0.1V Accuracy UT71A UT71B Overload Protection Input Impedance (0.05%+5) Around 2.5G (0.1%+8) (0.08%+5) (0.15%+8) (0.
Model UT71A/B: OPERATING MANUAL B. AC Voltage (AC+DC measurement is available) Accuracy Input Impedance Range Resolution Bandwidth 2V 0.0001V 45Hz~1kHz (0.8%+40) (0.6%+40) 1kHz~10kHz (1.8%+40) (1.6%+40) 10kHz~100kHz (7%+40) (7%+40) 20V 200V 1000V 0.001V 0.01V 0.1V UT71A UT71B 45Hz~1kHz (0.8%+40) (0.6%+40) 1kHz~10kHz (2%+40) (1.8%+40) 10kHz~100kHz (7%+40) (8%+40) 45Hz~1kHz (0.8%+40) (0.
Model UT71A/B: OPERATING MANUAL Remarks: l Overload Protection: 1000V. l Display: a) True rms are valid from 10% of range to 100% of range b) AC crest factor can be up to 3.0 except 1000V where it is 1.5. c) A residual reading of 80 digits with test leads shorted, will not affect stated accuracy. d) When frequency is lower than 100kHz, the accuracy guarantee range 10%-100%. e) When making AC+DC measurment, the accuray need to add (1%+ 35 digits) of reading based on the above table.
Model UT71A/B: OPERATING MANUAL C. DC Current Range Resolution 200µA 0.01µA 2000µA 0.1µA 20mA 0.001mA 200mA 0.01mA 10A 0.001A Accuracy UT71A Overload Protection UT71B (0.2%+20) (0.15%+20) 0.5A, 250V, fast type fuse, 5×20mm (0.8%+30) (0.7%+30) 10A, 250V, fast type fuse, 5×20mm Remarks: At 10A range: l When the measured current is 5A, continuous measurement is allowed. l When the measured current is between 5A-10A, continuous measurement 15 minutes.
Model UT71A/B: OPERATING MANUAL D. AC Current (AC+DC measurement is available) Range Resolution Bandwidth 200µA 0.01µA 2000µA 0.1µA 20mA 0.001mA 200mA 0.01mA 10A 0.001A Accuracy Overload Protection UT71A UT71B 45Hz~1kHz (1%+15) (0.8%+15) 1kHz~10kHz (2%+40) (1.5%+40) 0.
Model UT71A/B: OPERATING MANUAL E. Resistance Range 200 Resolution 0.01 Accuracy UT71A UT71B (0.5%+20)+test leads (0.4%+20)+test leads open circuit value open circuit value (0.5%+20) (0.4%+20) 2k 0.0001k 20k 0.001k 200k 0.01k (1%+20) (0.8%+20) 2M 0.0001M (1%+40) (1%+40) 20M 0.001M (1.5%+40) (1.5%+40) Overload Protection 1000V F. Continuity Test Range Resolution 0.01 Overload Protection 1000V Remarks: l Open circuit voltage approximate -1.2V.
Model UT71A/B: OPERATING MANUAL G. Diode Test Range Resolution Overload Protection 0.0001V 1000V Remarks: l Open circuit voltage approximate 2.8V. l A good silicon junction drops between 0.5V and 0.8V. H. Capacitance Accuracy Range 20nF Resolution 0.001nF UT71A (1.5%+20)+ capacitance UT71B Overload Protection (1.2%+20)+ capacitance value of open circuit test leads value of open circuit test leads 200nF 0.01nF (1.5%+20) (1.2%+20) (1.5%+40) (1.2%+40) 2µF 0.0001µF 20µF 0.001µF 200µF 0.
Model UT71A/B: OPERATING MANUAL I. Frequency Range Resolution 20Hz 0.001Hz 200Hz 0.01Hz 2kHz 0.0001kHz 20kHz 0.001kHz 200kHz 0.01kHz 2MHz 0.0001MHz 20MHz 0.001MHz 200MHz 0.01MHz Accuracy Overload Protection (0.
Model UT71A/B: OPERATING MANUAL J. Temperature (UT71B only) Degrees Celsius Range Resolution -40ºC~40ºC 40ºC~400ºC Accuracy Overload Protection (3%+30) 0.1ºC 400ºC~1000ºC (1%+30) 1000V 2.5% Fahrenheit Range Resolution -40ºF~32ºF 32ºF~752ºF 752ºF~1832ºF Accuracy Overload Protection (4%+50) 0.1ºF (1.5%+50) 1000V 3% Remarks: l Included is a K-Type (nickel chromium ~ nickel silicon) point contact temperature probe which could only measure temperature below 230ºC.
Model UT71A/B: OPERATING MANUAL K. 4~20 mA loop current (UT71B only) Range Resolution Accuracy Overload Protection (4~20mA)% 0.01% (1%+50) 0.5A, 250V, fast type fuse, 5×20mm Remarks: When the readings obtained is: l < 4mA, the primary display shows LO l 4mA, the primary display shows 0% ….
Model UT71A/B: OPERATING MANUAL This operating manual is subject to change without notice. Copyright 2005 Uni-Trend Group Limited. All rights reserved.
