Tektronix UT33C Digital Multimeter User Manual

Tektronix UT33C Digital Multimeter

Specifications

• General Specifications: True-rms, autoranging digital multimeter
• Mechanical Specifications: 25000 counts LCD display, backlight
• Environmental Specifications: Battery-powered
• Electrical Specifications: AC/DC voltage measurement, resistance test, frequency test, temperature test, duty cycle test

Maintenance

• Clean the Product: Regularly clean the multimeter to ensure accurate readings.
• Replace the Batteries: Replace batteries when the low battery indicator is displayed.
• Replace the Fuses: If needed, replace fuses following the instructions in the user manual.

FAQ
Q: What is the warranty period for this product?
A: Customers enjoy a one-year warranty from the date of purchase. This warranty excludes certain components like fuses and disposable batteries.

LIMITED WARRANTY

AND LIMITATION OF LIABILITY
Customers enjoy a one-year warranty from the date of purchase.
This warranty does not cover fuses, disposable batteries, damage from misuse accident, neglect, alteration, contamination, or abnormal conditions of operation or handling, including failures caused by use outside of the product’s specifications, or normal wear and tear of mechanical components.

Introduction

This product is a battery-powered, true-rms, auto-ranging digital multimeter with a 25000 counts LCD display and a backlight.

Safety Information
To avoid possible electrical shock, fire, or personal injury, please read all safety information before you use the product. Please use the product only as specified, or the protection supplied by the product can be compromised.

• Examine the case before you use the product. Look for cracks or missing plastic. Carefully look at the insulation around the terminals.
• The measurement must be made with correct input terminals and functions and within the allowable measuring range.
• Do not use the product around explosive gas, vapor, or in damp or wet environments.
• Keep fingers behind the finger guards on the probes.
• When the product has already been connected to the line being measured, do NOT touch the input terminal that is not in service.
• Disconnect the test leads from the circuit before changing the mode.
• When the voltage to be measured exceeds 36V DC or 25V AC, the operator shall be careful enough to avoid electric shock.
• Misuse of mode or range can lead to hazards, be cautious. “ ” will be shown on the display when the input is out of range.
• Low level of a battery will result in incorrect readings. Change the batteries when battery level is low. Do not make measurements when the battery door is not properly placed.

Instrument Overview

LCD Display

Function Buttons

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①

| Selects alternate measurement modes on a rotary switch setting, including:

1. Frequency/Duty Cycle
2. DC mA / AC mA
3. DC μA / AC μA
4. DC A / AC A
5. Diode / Continuity
6. DC mV / AC mV
7. AC+DC Voltage / DC Voltage
8.  Press and hold for 2 seconds to enter REL model, press again to exit this mode.

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②

| Push once to hold the current reading on the display; push again to continue normal operation. Push for more than 2 seconds to turn on the backlight; long- push again to turn off or the backlight automatically turns off after 2 minutes.
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③

| Push to toggle between the MAX  and the MIN mode. To exit MAX/MIN mode, push the button for more than 2 seconds.
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④

| Press to enter the manual range mode,

you can choose the appropriate range according to the measured signal size; If you want to exit, hold down the button for more than 2 seconds. The screen will display “AUTO”.

Rotary Switch

Input Terminals

Measurements Instruction

Measure AC/DC Voltage

1. Connect the black test lead to the COM
   Terminal and the red lead to the Terminal.

2. According to the voltage signal to be measured, rotate the dial to select the corresponding voltage gear; Press RANGE button to enter manual range mode, and press SEL button to switch AC/DC in mV mode.

3.  Touch the probes to the correct test points of the circuit to measure the voltage.

4. Read the measured voltage on the display.

• Do not measure voltage that exceeds the extremes as indicated in the Specifications.
• Do not touch high voltage circuit during measurements.

Measure AC/DC Current

1. Connect the black test lead to the COM
   Terminal and the red lead to the corresponding terminal.（20A or mAuA).

2. Point the arrow on the knob to the AC/DC A,mA or uA range, depending on the signal size.

3. Break the circuit path to be measured, connect the test leads across the break and apply power.

4. Read the measured current on the display.

• Do not measure current that exceeds the extremes as indicated in the Specifications.
• Use the 20A Terminal when you are measuring an unknown current. Then select the test port and gear according to the displayed value.
• Do not input voltage at this setting.

Measure Resistance

1. Connect the black test lead to the COM Terminal and the test lead to the Terminal.
2. Rotate the dial to the Ω mode.
3. Touch the probes to the desired test points of the circuit to measure the resistance.
4. Read the measured resistance on the display.

• Disconnect circuit power and discharge all capacitors before you test resistance.
• Do not input voltage at this setting.

Measure continuity

1. Connect the black test lead to the COM Terminal and the red lead to the Terminal.
2. Turn the rotary switch to Diode/Continuity mode , then press the SEL button.
3. Touch the probes to the desired test points of the circuit.
4. The built-in beeper will beep when the resistance is lower than 50Ω, which indicates a short circuit.

• Do not input voltage at this setting.

Test Diodes

1. Connect the black test lead to the COM Terminal and the red lead to the Terminal.
2. Turn the rotary switch to Diode mode.
3. Connect the red probe to the anode side and the black probe to the cathode side of the diode being tested.
4. Read the forward bias voltage value on the display.
5. If the polarity of the test leads is reversed with diode polarity or the diode is broken, the display reading shows “ ”.

• Do not input voltage at this setting.
• Disconnect circuit power and discharge all capacitors before you test diode.

Measure Capacitance

1. Connect the black test lead to the COM Terminal and the red lead to the Terminal.
2. Turn the rotary switch to .
3. Connect the red probe to the anode side and the black probe to the cathode side of the capacitor being tested.
4. Read the measured capacitance value on the display once the reading is stablized.

*Disconnect circuit power and discharge all capacitors before you test capacitance.

Measure Frequency

1. Connect the black test lead to the COM Terminal and the red lead to the Terminal.
2. Turn the rotary switch to (applies to high frequency with low voltage); or turn the rotary switch to , press SELECT once to toggle to the Frequency Mode (applies to low frequency with high voltage).
3. Touch the probes to the desired test points.
4. Read the measured frequency value on the display.

Measure Duty Cycle

1. Connect the black test lead to the COM Terminal  and the red lead to the Terminal.
2. Turn the rotary switch to , press the Hz % button once to toggle to the Duty Cycle Mode .
3. Touch the probes to the desired test points.
4. Read the measured duty cycle value on the display.

Measure Temperature

1. Connect the black thermocouple probe to the COM Terminal and the red probe to the Terminal.
2. Turn the rotary switch to ℃/℉ mode, and the display will show the room temperature .The main display display will show the value of ℃ , and the vice display will show the value of ℉.
3. Touch the probes to the desired test points.
4. Read the measured temperature on the display.

*Do not input voltage at this setting.

Test NCV

1. Turn the rotary switch to NCV mode, and the display will shows “EF”.
2. Hold the product and move it around, the builtin beeper will beep when the inner sensor detects AC voltage nearby. The stronger the voltage is, the quicker the beeper beeps.
3. If the red test lead is inserted into the “ ”  alone, and the probe of the test lead is used to contact the mains power plug, if the buzzer alarm is strong, it is the live wire, otherwise the earth wire or the neutral wire.

AC+DC Voltage Measurement

1.  Rotate the dial to the mode， then connect the black test lead to the COM Terminal and the red lead to the Terminal.
2. Touch the probes to the correct test points of the circuit.
3. Read the measured voltage on the display. The main display display will show the value of DC voltage, and the vice display will show the value of AC voltage.
4. Press the SEL to read the value of AC+DC Voltage.

• *Do not measure voltage that exceeds the extremes as indicated in the Specifications.
• Do not touch high voltage circuit during measurements.

Maintenance

Beyond replacing batteries and fuses, do not attempt to repair or service the product unless you are qualified to do so and have the relevant calibration, performance test, and service instructions.

Clean the Product
Wipe the product with a damp cloth and mild detergent.
Do not use abrasives or solvents. Dirt or moisture in the terminals can affect readings.
*Remove the input signals before you clean the product.

Replace the Batteries
When “ ” is shown on the display, batteries shall be replaced as below:

1. Remove the test leads and turn off the product before replacing the batteries.
2. Loosen the screw on the battery door and remove the battery door.
3. Replace the used batteries with new batteries of the same type.
4. Place the battery door back and fasten the screw.

Replace the Fuses
When a fuse is blown or do not work properly, it shall be replaced as below:

1. Remove the test leads and turn off the product before replacing the fuse.
2. Loosen the four screws on the back cover and the screw on the battery door, then remove the battery door and the back cover.
3. Replace the fuse with a new fuse of the same type.
4. Place the back cover and the battery door back and fasten the screws.

Specifications

Environmental Specifications

Operating| Temperature| 0~40℃
Humidity| ＜75%
Storage| Temperature| -20~60℃
Humidity| ＜80%
General Specifications

Display (LCD)| 25000 counts
Ranging| Auto/Manual
Material| ABS/PVC
Update Rate| 3 times/second
Ture RMS| √
Data Hold| √
Backlight| √
Low Battery

Indication

| √
Auto Power Off| √
Mechanical Specifications

Dimension| 1809050mm
Weight| 384g（no battery）
Battery Type| 1.5V AA Battery * 3
Warranty| One year

Electrical Specifications

DC Voltage

(mV)

| 25.000mV| 0.001mV| ±(0.05%+3)
250.00mV| 0.01mV

DC Voltage

(V)

| 2.5000V| 0.0001V| ****

±(0.05%+3)

25.000V| 0.001V
250.00V| 0.01V
1000.0V| 0.1V
AC Voltage (mV)| 25.000mV| 0.001mV| ****

±(0.3%+3)

250.00mV| 0.01mV

AC Voltage (V)

| 2.5000V| 0.0001V
25.000V| 0.001V
250.00V| 0.01V
750.0V| 0.1V
Function| Range| Resolution| Accuracy
---|---|---|---

AC+DC

voltage (DC)

| 2.5000V| 0.0001V| ****

±(0.5%+3)

25.000V| 0.001V
250.00V| 0.01V
1000.0V| 0.1V

AC+DC

voltage (AC)

| 2.500V| 0.001V| ****

±(1.0%+3)

25.00V| 0.01V
250.0V| 0.1V
750V| 1V

AC+DC

voltage (AC+DC)

| 2.5000V| 0.0001V| ****

±(1.5%+3)

25.000V| 0.001V
250.00V| 0.01V
1000.0V| 0.1V
Function| Range| Resolution| Accuracy
---|---|---|---
DC Current (A)| 2.5000A| 0.0001A| ****

±(0.5%+3)

20.000A| 0.001A
DC Current (mA)| 25.000mA| 0.001mA
250.00mA| 0.01mA
DC Current (μA)| 250.00uA| 0.01uA| ±(0.5%+3)
2500.0uA| 0.1uA
AC Current (A)| 2.5000A| 0.0001A| ****

±(0.8%+3)

20.000A| 0.001A
AC Current (mA)| 25.000mA| 0.001mA
250.00mA| 0.01mA
AC Current

(μA)

| 250.00uA| 0.01uA| ±(0.8%+3)
2500.0uA| 0.1uA

Resistance

| 250.00Ω| 0.01Ω| ±(0.5%+3)
2.5000kΩ| 0.0001kΩ| ****

±(0.2%+3)

25.000kΩ| 0.001kΩ
250.00kΩ| 0.01kΩ
2.5000MΩ| 0.0001MΩ| ±(1.0%+3)
25.00MΩ| 0.01MΩ
250.0MΩ| 0.1MΩ| ±(5%+5)
Function| Range| Resolution| Accuracy
---|---|---|---

Capacitance

| 9.999nF| 0.001nF| ±(5.0%+20)
99.99nF| 0.01nF| ****

±(2.0%+5)

999.9nF| 0.1nF
9.999μF| 0.001μF
99.99μF| 0.01μF
999.9μF| 0.1μF
9.999mF| 0.001mF| ±(5.0%+5)

Frequency

| 250.00Hz| 0.01Hz| ****

±(0.1%+2)

2.5000KHz| 0.0001KHz
25.000KHz| 0.001KHz
250.00KHz| 0.01KHz
2.5000MHz| 0.0001MHz
10.000MHz| 0.001MHz
Duty Cycle| 1%~99%| 0.1%| ±(0.1%+2)
Function| Range| Resolution| Accuracy
---|---|---|---

Temperature

| (-20~1000)℃| 1℃| ±(3%+5）
(-4~1832)℉| 1℉
Diode| √
Continuity| √

NCV

| ****

√

AC+DC voltage measurement| AC+DC 1V~1000V

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