UNI-T UT33A+ Palm Size Multimeter User Manual

UNI-T UT33A+ Palm Size Multimeter User Manual

Overview

The new generation UT33+ series products redefine the performance standards for entry-level digital multi meter. The innovative industrial design ensures the products have 2 meters impact resistance. The new LCD display layout provides a clear display for better user experience. The UT33+ series ensure safe operation in CAT II 600 V environment.

The special features of each model are as follows:

• UT33A+: 2mF capacitance test function
• UT33B+: Battery test with status indicators
• UT33C+: Temperature test
• UT33D+: NCV test

Open Box Inspection

Open the package box and take out the device. Please check whether the following items are deficient or damaged and contact your supplier immediately if they are.

• User Manual: 1pc
• Test leads: 1 pair
• Protective case: 1 pc
• K-type thermocouple: 1 pc (UT33C+ only)

Warning: Please carefully read “Safe Operation Rule- before using the device.

Safe Operation Rule

Safety Certification

The product complies with IEC 61010 safety standard. as well as CAT II: 600V, RoHS, pollution grade II, and double insulation standards.

Safety instructions and precautions

1. Do not use the device if the device or test leads appear damaged or if you suspect that the device is not operating properly. Pay particular attention to the insulation layers.
2. If the test leads are damaged, it must be replaced with one of the same type or the same electrical specification.
3. When measuring, do not touch exposed wires, connectors, unused ¡,p,Q or the circuit being measured.
4. When measuring the voltage higher than 60 VDC or 36 VACrms, keep your fingers behind the finger guard on the test lead in order to prevent electric shock.
5. If the range of the voflage to be measured is unknown, the maximum range should be selected and then gradually decreased.
6. Never input voltage and current exceeding the value listed on the device.
7. Before switching ranges, make sure to disconnect the test leads with the circuit to be tested. it is strictly prohibited to switch the ranges during ten.
8. Do not use or store the device in high temperature, high humidity, flammable, explosive or strong magnetic field environments.
9. Do not change the internal circuit of the device in order to avoid the damage to the devise and users.
10. To avoid false reading, replace the battery when the battery indicator appears.
11. Use dry cloth to clean the case, do not use detergent containing solvents.

Electrical Symbols

| Low Battery| | High Voltage Warning
---|---|---|---
| Electrical Ground| | AC/DC
| Double Insulation| | Warning

Specification

1. The maximum voltage between the input terminal and the ground: 600Vrms

2. 10A terminal: Fuse 10A 250V Fast fuse Φ5x20mm

3. mA/pA terminal: Fuse 200mA 250V Fast fuse Φ5x20mm

4. Max display 1999, over range display “OL”, update rate: 2-3 times/second

5. Range select: Auto range UT33A+; Manual range UT33B*/C+/D+

6. Backlight: manual on, auto shut off after 30 seconds

7. Polañty: “-” symbol displaying on screen represents negative polarity Signal

8. Data hold function: symbol displays on screen when data hold function is activated.

9. Low   battery power: symbol displays on screen when battery power is low

10. Battery: AAA 1.SV * 2

11. Operating temperature: 0-4“C (32”F-104”F)
    Storage temperature: -10-50”C (14”F-122“F)
    Relative humidity: OEC-30”C: T75% RH, 30”C-40”C: T50% RH
    Operating altitude: 0 – 2000m

12. Dimension: (134 x77x47) mm

13. Weight: about 20sg (battery included)

14. Electromagnetic compatibility:
    In fields with less than IV/m radio frequency, the total accuracy
    = designated accuracy + 5% of measurement range
    In fields with more than 1V/m radio frequency. the accuracy is not specified.

Structure

1. Display Screen
2. Function Keys
3. Functional dial
4. 10A input jack
5. COM jack
6. Remaining inputs jack

Figure 1

Key Functions

1. UT33A+:

   • SEL/REL: press this key to switch between AC and DC modes for mV ,   and REL positions.
     HOLD/  : Press to enter or exit data hold mode. Long press over 2 seconds to turn on/off back light.

2.   UT33B+/C+/D+:

   • HOLD/SEL: Press to enter or exit data hold mode In continuity/diode mode, press to cycle switch between the two modes
   • : Press to turn on/off backlight.

Operations

To avoid false reading, replace the battery if the battery low power symbol a appears. Also pay special attention to the warning sign A beside the test lead jack, indicating that the tested voltage or current must not exceed the values listed on the device.

AC/DC voltage measurement (see Figure 2b)

Fig 2a/ Fig 2b

1. Switch the dial to “V∼” position.
2. Insert the black test lead into the COM jack, the red test lead into the “VΩmA” jack. Connect test leads with the load in parallel.

Notes:

• Do not measure voltage over 600 vrms. or it may expose users to electric shock and damage the deviœ. Il the range of the voltage to be measured is unknown, select the maximum range and reduce accordingly.
• Please pay extra attention when measuring high voltage in order to avoid electric shock.
• Before using the device, it is suggested to measure a known voltage for verification.

Resistanœ measurement (see Figure 2b)

1. Switch the dial to “Ω” position.
2. Insert the black test lead into the COM jack, the red test lead into the “V lmA” jack. Connect test leads with the resistor in parallel.

Notes:

• Before measuring resistance, switch off the power supply of the circuit, and fully discharge all capacitors.
• If the resistance when probes are shorted is more than 0.5 Ω, please check if test leads are loosened or damaged.
• If the resistor is open or over the range, the “OL” symbol will be displayed on the screen.
• When measuring low resistance, the test leads will produce 0.1Ω-0.2 Ω measurement error. To obtain accurate measurement, the measured value should subtract the value displayed when two test leads are shooted.
• When measuring high resistance above 1MΩ, it is normal to take a few seconds to steady the readings. In order to quickly obtain steady data, use short test wires to measure high resistance.

Continuity measurement (see Figure 2b)

1. Switch the dial to ” ” position.
2. Insert the black test lead into the COM jack, the ed test lead into the wΩmA” jack. Connect test leads with the points to be tested in parallel
3. If measured points’ resistance >51CΩ, circuit is in open status.
   If measured points’ resistance ≤10CΩ, circuit is in good conduction status buzzer will go off.

Notes:
Before measuring continuity, switch off all power supplies and fully discharge all capacitor.

Diode measurement (see Figure 2b)

1. Switch the dial to “ ” position.
2. Insert the black test lead into the COM jack‹, the red test lead into the ’V ΩmA” jack. Connect test leads with the diode in parallel
3. “OL” symbol appear when the diode is open or polarity is reversed.
   For silicon PN junction, normal value: 500 ∼ 800mV (0.5 ∼ 0.eV).

Notes:

• Before measuring PN junction, switch off the power supply to the circuit,
  and fully discharge all capacitors

Capacitance measurement (only for UT33A+, see Figure 2a)

1. Switch the dial to capacitance test.

2. Insert the black test lead into the COM jack, the red test lead into the
   V ΩmA” jack. Connect test leads with the capacitor in parallel

3. When there is no input, the device displays a fixed value (intrinsic capacitance).

4. For small capacitance measurement, to ensure measurement accuracy, the measured value must be subtracted from intrinsic capacitance.

5. Users can measure small capacity capacitor with relative measurement functions (REL) (the device will automatically subtract the intrinsic Capacitance)

Notes:

• If the tested capacitor is shorted or its capacity is over the specified range “OL” symbol will be displayed on the screen.
• When measuring large capacitor, it may take a few seconds to obtain steady readings.
• Before measuring capacitors (especially for high voltage capacitors), please fully discharge them.

DC measurement (see Figure 3 )

1. Switch the dial to DC test.
2.  Insert the black test lead into the COM jack, the red test lead into the “V ΩmA” jack. Connect test leads with the tested circuit in series.

Fig 3

Notes:

• Before measuring, switch off the power supply of the circuit and carefully check the input terminal and range position.

• If the range of the measured current is unknown, select the maximum range and then reduce accordingly.

• Please replace the fuse with the same type.
  10A jack: Fuse 10A/250V Ω5x20mm
  VΩmA jack: Fuse 0.2A/250V Ω5x20mm

• When measuring, please do not connect the test leads with any circuit in parallel. Otherwise there is a risk of damage to the device and human body.

• If the tested current is over 10A, each measurement time should be less than 10 seconds and the next test should be after 15 minutes.

AC measurement (only for UT33A+, see Figure 3)

1. Similar to DC Measurement.
2. Please refer to Section 6 “DC measurement (see Figure 3)”

Battery measurement (only for UT33B+, see Figure 4)

1. Switch the dial to battery test.

2. Insert the black test lead into the COM jack, the red test lead into the “VΩmA” jack. Connect test leads with the battery in parallel.
   Red test lead at positive pole “+”, black test lead at negative pole“-“

3. Battery status:
   “Good”: Normal status
   “Low”: Low power but still working
   “Bad”: Replace/charge batteries

4. Battery display

Fig 4

• 1.5 Battery
  
  Load Resistance: 30 0:
  “Good’: Voltage ≥1.31V
  “Low’: Voltage 0.95V-1.31V
  “Bad’: Voltage ≤0.94V

• 9V Battery
  
  Load Resistance: 900Ω
  “Good”: Voltage ≥7.8V
  “Low”: Voltage 5.7∼7.7V
  “Bad”: Voltage ≤ 5.6V

• **12V Battery

Load Resistance: 60Ω
“Good”: Voltage ≥10.5V
“Low”: Voltage 7.6∼10.4V
“Bad”:** Voltage ≤ 7.5V

Notes:

• When the measured voltage is<0.2V (0.05V-0.19V), no indicator status will be displayed  andthe reading will flash for 3 seconds for every 6 second interval.
  

Temperature measurement (only for UT33C+)

1. Switch the dial to temperature test.
2. Insert K-thermonuclear into the devise and fix the temperature probe to
   the measured object. Read the value when it is stable.

Notes:

• Only K-thermocouple is applicable. The measured temperature should be less than 250“C/482”F (“F=”C”1.8*32)

NCV measurement (only for UT33D+, see Figure 5)

Fig 5

1. switch the dial to NCV position
2. Place the device near the measured object. “-” symbol indicates the intensity of the electric field. More “-” and the higher the buzzer frequency, the higher the electric field intensity.
3. Intensity of electric field.
    

Additional features

• The devise enter measurement status in 2 seconds after startup.

• The device automatically shuts down if there is no operation for 15 minutes.
  You can wake up the device by pressing any key.
  To disable auto shutdown, switch the dial to OFF position, long press
  HOLD key and turn on the device.

• When pressing any key or switching the dial, the buzzer will beep once

• Buzzer Notification

  1. Input voltage ≥600V (AC/DC), buzzer will continuously beep indicating measure range is at limit
  2. Input current >10A (AC/DC), buzzer will continuously beep indicating measure range is at limit.

• 1 min before auto shutdown, 5 continuous beeps.
  Before shutdown, 1 long beep.

• Low power warnings:
  Voltage of the battery < 2.SV, symbol appears and flashes for 3 seconds every 6 second period. During low power status, the device on still work. Voltages the battery < 2.2V, a solid symbol appears, the device cannot work.

Technical specification

• Accuracy: ± % of reading + numerical value in least significant it slot 1 Year Warranty
• Ambient temperature: 23”C +5”C (73.4°F-E9”F)
• Ambient humidity: ≤75% RH

Notes:

• To ensure accuracy, operating temperature should be within 18”C -28”C.
• Temperature Coefficient= 0.1”(specified accuracy}/°C (<18°C or>28”C)

Dc Voltage

• Input impedance: about 10mΩ.
• Result might be unstable at mV range when no load is connected . the value becomes stable once the load is connected . Least significant digit ≤±3.
• Max input voltage: ±600V, when the voltage ≥610V, “OL” symbol appears.
• Overload protection: 600Vms(AC/DC)

AC voltage

• Input impedance: about 10MΩ ,
• Frequency response: 40Hz ∼ 400Hz, sine wave RMS (average response).
• Max input voltage: ±600V, when the voltage ≥610V, “OL” symbol appears
• Overload protection: 600Vms (AC/DC)

Resistance

• Measurement result’ = reading of resistor reading of sf+orted test leads
• Overload protection: 600Vrrris (AC/DC)

Continuity, diode

will be regarded as in open status, and the buzzer does not go off. If the measured resistance is less than 100, the measured circuit will be regarded as in good conduction status, and the buzzer goes off.
| 0.001V| Open circuit voltage: 2.1V, test current is about 1mA Silicon PN junction voltage is about 0.5-0.8V.

• Overloaded protection: 600Vrms(AC/DC)

**Capacitance (only for ut33A+)

**

• Overload protection: 600Vrms(AC/DC).
• Tested capacitance ≤ 200nF, adapt REL mode.

Temperature (only for UT33C+)

Range

| Resolution| Accuracy
---|---|---
°C| -40∼1000°C| -40∼0°C| 1°C| +4°C

0∼100°C| ± (1.0%+4)
100∼1000°C| ± (2.0%+4)
°F|

-40∼1832 °F

| -40∼32 °F| 1°F| +5 F

32∼212F| ± (1.5%+5)
212∼1832 °F| ± (2.5%+5)

• Overload protection: 600Vrms (AC/DC).
• K thermocouple is only applicable for temperature less than 250 °C/482 °F.

DC Current

Range

| Model| Resolution|

Accuracy

---|---|---|---
200.OµA| UT33A+/B+| 0.1µA| ± ( 1.0%+2)
2000µA| UT33A+/C+/D+| 1µA| ± ( 1.0%+2)
20.00mA| UT33A+/C+/D+| 0.01mA| ± ( 1.0%+2)
200.0µA| UT33A+/B+/C+/D+| 0.1mA| ± ( 1.0%+2)
2.000A| UT33A+| 0.001A| ± ( 1.2%+ 5)
10.00A| UT33A+/B+/C+/D+| 0.01A| ± ( 1.2%+5)

• Input current> 10A , ”OL” symbol appears and buzzer beeps.
• Overload protection
  250Vrms
  µA mA range: F1 Fuse 0. 2A/250V Ø 5x2Omm
  10A range: F2 Fuse 10A/250V Ø 15x2Omm

AC Current (Only for UT33A+)

Range

| Model| Resolution|

Accuracy

---|---|---|---
200.0 µA| UT33A+| 0.1µA| ± ( 1.2%+3)
2000µA| UT33A+| 1µA| ± ( 1.2%+3)
20.00mA| UT33A+| 0.01mA| ± ( 1.2%+3)
200.0mA| UT33A+| 0.1mA| ± ( 1.2%+3)
2.000A| UT33A+| 0.001A| ± ( 1.5%+5)
10.00A| UT33A+| 0.01A| ± ( 1.5%+5)

• Frequency response: 40 – 400Hz.
• Accuracy guarantee range: 5 -100% of the range, shorted circuit allows least significant digit ≤ 2.
• Input current >10.10A, “OL” symbol appears with beeps.
• Overload protection
  250Vrms
  µA mA range : F1 Fuse 0.2A/250V Ø 5×20 mm
  10A range : F2 Fuse 10A/250V Ø 5x20mm

Maintenance

Warning: Before opening the rear cover, switch off the power supply (remove test leads from the input terminal and the circuit).

General maintenance

1. Clean the case with a damp cloth and detergent. Do not use abradants or solvents.
2. If there is any malfunction, stop using the device and send it to maintenance.
3. The maintenance and service must be conducted by qualified professionals or designated departments.

Replacements (see Figure 7a, Figure 7b) Battery replacement:

To avoid false reading, replace the battery when the battery indicator appears. Battery Specification: AAA 1.5V x 2.

1. Switch the dial to “OFF “position and remove the test leads from the input terminal.
2. Take off the protective case. Loosen the screw on battery cover, remove the cover to replace the battery. Please identify the positive and negative pole.

Fuse replacement:

1. Switch the dial to “OFF “position and remove the test leads from the input terminal.
2. Loosen the both screws on the rear cover, then remove the rear cover to replace the fuse.
   Fuse specification
   Fl Fuse 0.2A/250V Φ5x20mm ceramic tube.
   F2 Fuse 10A/250V Φ5x20mm Ceramic tube

Figure 7a

Figure 7b

Customer support

U NI-TREND TECHNOLOGY (CHINA) CO., LTD.
No6, Gong Ye Bei 1st Road, Songshan Lake National High-Tech Industrial Development Zone, Dongguan City, Guangdong Province, China
Tel: (86-769) 8572 3888
http://www.uni-trend.com

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