UNI-T UT520 Series Operating Manual

1.Safety Information
This operation manual includes the safety information related to the operation of the
tester, please read them carefully before using the tester.
Before using the Tester, please read and understand the operating manual.
Please keep the Operating Manual properly for future use.
Use the Tester as specified in the Operating Manual.
Please understand in detail the Safety Information section of the manual.
Strictly follow the Safety Information, otherwise it may cause personal injury or
damage to the Tester.
Safety sign " "has 3 meanings in this manual, the user has to pay attention to
this sign " " during operation.
Danger identifies conditions and actions that most likely pose severe or
fatal hazard(s) to the users
Warning identifies conditions and actions that may pose severe or
fatal hazard(s) to the users.
Caution identifies conditions and actions that will pose hazard(s) or
damage the Tester.
Danger
Do not use the Tester around explosive environment, which may cause fire and
explosion.
Do not make any connections when the Tester is wet or the operator's hands
are wet.
Do not apply any voltage beyond the rating or specified range of the Tester.
Do not open battery compartment while testing.
Warning
Do not use the Tester if it is damaged or metal part is exposed.
Do not disassemble the tester randomly. If it needs repair, please contact our
after-sales services or our agents.
Do not change battery or open battery compartment when the Tester is wet.
clean it with dry soft cloth first.
Make sure the Tester is turned off when changing battery or opening the battery
compartment.
Caution
Ensure test lead is inserted into the corresponding port before measurement.
Take the battery out from the Tester if it is not used for a long time.
Do not expose the Tester in extreme temperature and wet environment.
Soft cloth and mild detergent should be used to clean the surface of the Tester
No abrasive and solvent should be used
Dry the tester before storing if it is wet.
Electrical Symbols are used on the Tester or in the manual:
danger, warning, caution
AC
Conforms to Standards of European Union
2.Features
The Tester is designed with intelligent micro-controller chip to maintain high
accuracy and reliability. It can measure earth resistance of earth ground devices for
electric power installations, electrical appliances, lightening protection systems, etc,
and also measure earth voltage(It is highly recommended not to use the Tester
under severe outdoor environments such as raining or thunder).
●
Backlight LCD;
●
Battery Check;
●
Data Hold& Data Storage(up to 20 sets);
●
Auto Power Off;
●
Offers Precision Three-Wire & Simple Two-Wire Measurements;
●
"- - - - Ω" Indication for Bad Connection to C or E Terminal When Measuring
Earth Ground Resistance;
●
"OL" Overloaded Indication;
●
Double-or Reinforced-Insulated Structural Design.
double or reinforced insulation
Grounding
3.Technical Specifications Specifications
Measuring range and accuracy(under 20
Functions Measure Range
Earth Voltage 0V~400V(50/60Hz)
40 0.00 ~40.00
Earth
400 0.0 ~400.0
Resistance
4000 0 ~4000
Compliances:
IEC 61010-1 CATIII 600V; Pollution Degree 2
IEC 61557-1,5
IEC 61010-2-31
Measure modes:
(1) Earth Voltage measurement: average respond
(2) Earth Resistance measurement: test signal frequency : around 820Hz,
current: around 3.2mA at 40Ω range.
Measuring scope (Max. deviation:±30%):
40 Range: 5.00 ~40.00
400 Range: 40.0 ~400.0
4000 Range :400 ~4000
Working condition:
Temperature:5 ~40
Relative humidity: 80%RH(no fog)
Altitude: 2000 m
Storage condition:
Temperature:-20 ~60
Relative humidity: 75%RH(no fog)
Power: [1.5V Alkaline Battery (AA)*6]
Overload protection:
Earth resistance ranges: 200 Vac (10 seconds)
Earth voltage ranges: 600 Vac (30 seconds)
Insulation impedance:
＞20MΩ between measure circuits and the casing.
Product size: 160mmx70.5mmx100mm.
Product Weight: around 560g.
Accessories:
Green test lead (5m)
Yellow test lead (10m)
Red test lead (20m)
Auxiliary earth stakes
Simple test leads with alligator clips
1.5V Alkaline Battery (AA)
Carrying bag
English manual
4. Tester Structure&Accessories (Figure 1)
Figure 1
5. Preparation before measurement
5.1
Battery Check: Set the rotary switch to earth voltage or earth ground
resistance ranges, if " " shows, it indicates the battery is very low and
needs to be replaced timely, otherwise the Tester may be unable to work
normally.
Battery sign
5 & 75%RH):
Best Accuracy
(1.0%+6)
(2.0%+20) (40 range)
(2.0%+3)(400 or 4000 range)
(Auxiliary earth resistance 500
(accuracy 5%);earth voltage 10Vac)
1 pc
1 pc
1 pc
2 pcs
1 set
6 pcs
1 set
1 pc
LCD Display
1
LIGHT/LOAD button
2
3 HOLD/SAVE button
4 TEST button
Rotary switch
5
Input terminals
6
7 Standard 3-Wires test leads
8 Simple 2-Wires test leads
Auxiliary earth stakes
9
Battery Voltage
8.2V
7.8V~8.2V
7.4V~7.8V
7.0V~7.4V
7V