advertisement
Handheld Digital Multimeter
GDM-541/533
USER MANUAL
ISO-9001 CERTIFIED MANUFACTURER
This manual contains proprietary information, which is protected by copyright. All rights are reserved. No part of this manual may be photocopied, reproduced or translated to another language without prior written consent of Good Will company.
The information in this manual was correct at the time of printing.
However, Good Will continues to improve products and reserves the rights to change specification, equipment, and maintenance procedures at any time without notice.
Good Will Instrument Co., Ltd.
No. 7-1, Jhongsing Rd., Tucheng Dist., New Taipei City 236, Taiwan.
Table of Contents
Table of Contents
S AFETY INSTRUCTIONS .................................................. 4
G ETTING STARTED .......................................................... 7
GDM-541/533 Overview .......................................... 8
Function Dial and Function Buttons ...................... 12
O PERATION .................................................................. 14
Operating Instructions .......................................... 15
AC Voltage Measurement ...................................... 15
DC Voltage Measurement ...................................... 17
AC/DC Millivolt Voltage Measurement .................. 19
LoZ (low impedance) ACV Measurement (GDM-533)21
Resistance Measurement ....................................... 23
Continuity Test ...................................................... 25
Diode Test ............................................................. 27
Capacitance Measurement ..................................... 29
Transistor Magnification (hFE) Measurement
(GDM-541) ............................................................ 31
Frequency/Duty Ratio Measurement ...................... 32
Temperature Measurement (GDM-533) ................ 33
AC/DC Current Measurement ................................ 35
Non-Contact Voltage (NCV) Detection .................. 37
USB Data Transmission ......................................... 39
Others ................................................................... 40
S PECIFICATIONS ........................................................... 41
General Specifications ........................................... 41
Electrical specifications ......................................... 42
M AINTENANCE ............................................................. 55
General Meintenance ............................................ 55
Battery/Fuse Replacement ..................................... 56
3
GDM-541/533 User Manual
4
S
AFETY INSTRUCTIONS
This chapter contains important safety instructions that you must follow during operation and storage. Read the following before any operation to ensure your safety and to keep the instrument in the best possible condition.
Electrical Symbols
These safety symbols may appear in this manual or on the instrument.
Warning or Caution
Caution, possibility of electric shock
Both direct and alternating current
Equipment protected throughout by DOUBLE
INSULATION or REINFORCED INSULATION
Earth (ground) Terminal
Complies with European Union standards
CAT III It is applicable to testing and measuring circuits connected to the distribution part of the building's low-voltage MAINS installation.
SAFETY INSTRUCTIONS
CAT IV It is applicable to testing and measuring circuits connected atthe source of the building’s low voltage MAINS installation.
Safety Instructions
The meter is designed and manufactured according to IEC61010-1 safety standard, and conforms to CAT III 1000V, CAT IV 600V, and pollution degree 2. If the meter is used in a manner not specified by the manufacturer, the protection provided by the meter may be impaired.
Before use, please check if there is any item which is damaged or behaving abnormally. If any abnormal item (such as bare test lead, damaged meter casing, broken LCD, etc.) is found, please do not use the meter.
Do not use the meter if the rear cover or the battery cover is not completely covered up, or it may pose a shock hazard!
Damaged test leads must be replaced with ones of the same model or same electrical specifications.
During measurement, do not touch any exposed wires, connectors, unused inputs or circuits being measured.
Use caution when working with voltages above AC 30Vrms,
42Vpeak or DC 60V. Keep fingers behind the finger guards of the test leads to prevent electric shock.
If the range of the measured value cannot be determined, the meter must be operated at the maximum range.
Do not apply more than the rated voltage or current marked on the meter between the terminals or between any terminal and earth ground.
5
GDM-541/533 User Manual
Place the function dial in the correct position before measurement.
Before measuring resistance, diode, continuity, or capacitance, switch off the power supply of the circuit, and fully discharge all capacitors.
Before measuring current, make sure the fuses are intact.
Do not use or store the meter in high temperature, high humidity, flammable, explosive, or strong magnetic field environments.
Do not change the internal circuit of the meter to avoid damage to the meter or user!
When “ ” is displayed, please replace the batteries in time to ensure measurement accuracy.
Turn off the meter in time after measurement. If the meter is not in use for a long time, please remove the batteries.
6
GETTING STARTED
G
ETTING STARTED
This chapter describes the GDM-541/533 in a nutshell, including its main features and front / rear panel introduction.
GDM-541 GDM-533
GDM-541/533 Overview .......................................... 8
Overview ............................................................................................. 8
Accessories .......................................................................................... 8
External Structure .............................................................................. 9
LCD Display ..................................................................................... 10
Function Dial and Function Buttons ...................... 12
Function Dial .................................................................................... 12
Function Buttons ............................................................................. 13
7
GDM-541/533 User Manual
GDM-541/533 Overview
Overview
The GDM-541/533 is a handheld true RMS digital multimeter with high reliability and security (GDM-533: 6000 counts; GDM-541:
22000 counts). With large screen, high resolution analog pointer display, full scale overload protection, and unique appearance design, it becomes a new practical electrical measuring meter. The meter can measure AC/DC voltage/current, resistance, diode, transistor hFE (GDM-541), continuity, capacitance, frequency, duty ratio, temperature (GDM-533), etc. Featuring data transmission, data hold, relative value measurement, peak measurement, internal temperature alarm, low battery indication, backlight, auto power off, and NCV functions, the meter is an ideal measuring tool for many application fields.
Accessories
Before using the GDM unit, check the package contents to make sure all the accessories are included.
Standard Accessories Description
User manual*1 pc
Test leads*1 pair
Adapter socket*1 pc
K-type thermocouple (GDM-533)*1 pc
USB cable*1 pc
1.5V AAA batteries*4
8
External Structure
GETTING STARTED
7
8
9
10
11
5
6
3
4
Item Index
1
2
Description
NCV detector
Indicator light
LCD display
Function buttons
Function dial
Input terminals
USB access port
Test lead slots
Nut for external holder
Battery compartment fixing screw
Tilt stand
9
LCD Display
GDM-541/533 User Manual
AC/DC k Ω , M Ω , Ω mV, V
μ A, mA, A nF, μ F, mF
Hz, %
GDM-533 GDM-541
Symbol Description
Measured voltage is >30V (AC or DC)
Data hold
Negative reading
AC/DC measurement
Low battery indication
Auto range
Diode test
Continuity test
Relative value measurement
Resistance units: ohm, kilohm, megaohm
Voltage units: millivolt, volt
Current units: microampere, milliampere, ampere
Capacitance units: nanofarad, microfarad, millifarad
Frequency, duty ratio
Low pass filter
10
NCV
P-MAX/P-
MIN
MAX/MIN
°C/°F
LoZ hFE
T RMS
GETTING STARTED
Data transmission
Transistor magnification (GDM-541)
Non-contact voltage detection
Peak measurement
Maximum/Minimum measurement
Celsius/Fahrenheit (GDM-533)
Low impedance measurement (GDM-533)
Transistor magnification measurement (GDM-541)
Auto power off
True RMS
11
GDM-541/533 User Manual
Function Dial and Function Buttons
Function Dial
Dial Position Description
Power off
AC voltage measurement/Low pass filter measurement/Frequency and duty ratio measurement (GDM-541)
DC voltage measurement/AC+DC measurement
(GDM-541)
AC voltage measurement/Frequency
AC/DC voltage measurement/Frequency and duty ratio measurement (GDM-533)
AC/DC millivolt voltage measurement/Frequency and duty ratio measurement
Diode test/Continuity test/Resistance measurement/Capacitance measurement
Transistor magnification measurement (GDM-541)
Frequency and duty ratio measurement
AC/DC microampere current measurement/Frequency and duty ratio measurement
AC/DC milliampere current measurement/Frequency and duty ratio measurement
AC/DC ampere current measurement/Frequencyand duty ratio measurement
Non-contact voltage detection
12
GETTING STARTED
Function Buttons
Button Description
Short press to switch between functions in each compound function position.
Short press to enter the manual range mode and change the range.
Long press to exit the manual range mode.
Short press to switch between frequency and duty ratio measurement.
Long press to turn on/off data communication (note: only available when USB communication module is inserted into the casing).
Short press to enter/exit the relative value measurement mode.
Short press to cycle through the measured maximum and minimum.
Long press to cycle through the peak maximum and peak minimum
Short press to hold the measurement on the display and “ ” will be displayed.
Short press again to cancel data hold.
Long press to turn on/off the backlight.
13
14
GDM-541/533 User Manual
O
PERATION
Operating Instructions .......................................... 15
AC Voltage Measurement ...................................... 15
DC Voltage Measurement ...................................... 17
AC+DC Voltage Measurement (GDM-541) .............................. 18
AC/DC Millivolt Voltage Measurement .................. 19
LoZ (low impedance) ACV Measurement (GDM-533)
.............................................................................. 21
Resistance Measurement ....................................... 23
Continuity Test ...................................................... 25
Diode Test ............................................................. 27
Capacitance Measurement ..................................... 29
Transistor Magnification (hFE) Measurement (GDM-
541) ....................................................................... 31
Frequency/Duty Ratio Measurement ...................... 32
Temperature Measurement (GDM-533) ................ 33
AC/DC Current Measurement ................................ 35
Non-Contact Voltage (NCV) Detection .................. 37
USB Data Transmission ......................................... 39
Others ................................................................... 40
OPERATION
Operating Instructions
Please check the internal batteries first. If “ ” is d isplayed, replace the batteries in time. Please also pay attention to the wa rning sign “ ” beside the input terminals, which indicates that the measured voltage or current must not exceed the values marked on the meter.
AC Voltage Measurement
Wire Connection
Diagram
Steps of
Measurement
1.
Insert the red test lead into the or terminal, and black test lead into the COM terminal.
2.
Turn the function dial to the position.
, , or
15
GDM-541/533 User Manual
Caution
3.
Short press the SELECT button to switch to
AC voltage measurement or LPF ACV measurement ( GDM-541 , manual maximum range by default) if required.
4.
Connect the test leads with the measured load or power supply in parallel.
5.
Read the voltage value on the display (if the voltage is >1000V, the red indicator light will be on and the buzzer will sound an alarm).
6.
Short press the button to display the frequency/duty ratio of the measured voltage.
Do not input a voltage over 1000V or it may damage the meter.
Be cautious to avoid electric shock when measuring high voltages.
After completing the measurement, disconnect the test leads from the circuit under test.
16
DC Voltage Measurement
Wire Connection
Diagram
OPERATION
Steps of
Measurement
1.
Insert the red test lead into the or terminal, and black test lead into the COM terminal.
2.
Turn the function dial to the position.
, , or
3.
Short press the SELECT button to switch to
DC voltage SELECT measurement if required.
4.
Connect the test leads with the measured load or power supply in parallel.
5.
Read the voltage value on the display (if the voltage is >1000V, the red indicator light will be on and the buzzer will sound an alarm).
17
GDM-541/533 User Manual
AC+DC Voltage Measurement (GDM-541)
Steps of
Measurement
1.
Insert the red test lead into the terminal, and black test lead into the COM terminal.
2.
Turn the function dial to the position.
3.
Short press the SELECT button to switch to
AC+DC voltage measurement.
4.
Connect the test leads with the measured load or power supply in parallel.
5.
Read the voltage values on the display. The
AC and DC voltages are displayed alternately.
18
OPERATION
AC/DC Millivolt Voltage Measurement
Wire Connection
Diagram
Steps of
Measurement
1.
Insert the red test lead into the or terminal, and black test lead into the COM terminal.
2.
Turn the function dial to the position.
3.
Short press the SELECT button to switch to
AC/DC millivolt voltage measurement if required.
4.
Connect the test leads with the measured load or power supply in parallel.
5.
Read the voltage value on the display.
6.
When measuring AC millivolt voltage, short press the button to display the frequency/duty ratio of the measured voltage.
19
20
Caution
GDM-541/533 User Manual
Do not input a voltage over 1000V or it may damage the meter.
Be cautious to avoid electric shock when measuring high voltages.
After completing the measurement, disconnect the test leads from the circuit under test.
Before each use, verify meter operation by measuring a known voltage.
The input impedance of the AC mV range is about 10MΩ. This load effect may cause measurement errors in high-impedance circuits. In most cases, if the impedance of the circuit is below 10kΩ, the error ca n be ignored
(≤0.1%).
The input impedance of the DC mV range is infinite (about 1GΩ), and it does not attenuate when measuring weak signals, so the measurement accuracy is high. When the test leads are open, there may be a value on the screen, but this is normal and will not affect the measuring result.
Frequency measurement at 60mV range (AC voltage) is for reference only.
OPERATION
LoZ (low impedance) ACV Measurement
(GDM-533)
Wire Connection
Diagram
Steps of
Measurement
1.
Insert the red test lead into the or terminal, and black test lead into the COM terminal.
2.
Turn the function dial to the position.
3.
Connect the test leads with the measured load or power supply in parallel.
4.
Read the voltage value on the display.
5.
Short press the button to display the frequency/duty ratio of the measured voltage.
21
Caution
GDM-541/533 User Manual
Do not input a voltage over 1000V or it may damage the meter.
Be cautious to avoid electric shock when measuring high voltages.
After completing the measurement, disconnect the test leads from the circuit under test.
Before each use, verify meter operation by measuring a known voltage.
After using the LoZ function, wait 3 minutes before next operation.
LoZ ACV measurement eliminates ghost voltage for more accurate measurement.
22
Resistance Measurement
Wire Connection
Diagram
OPERATION
Steps of
Measurement
1.
Insert the red test lead into the or terminal, and black test lead into the COM terminal.
2.
Turn the function dial to the position.
or
3.
Touch the probes to the test points in the circuit.
4.
Read the resistance value on the display.
23
24
Caution
GDM-541/533 User Manual
Use caution when working with voltages above AC 30Vrms, 42Vpeak or DC 60V. Such voltages pose a shock hazard.
If the measured resistor is open or the resistance exceeds the maximum range, the
LCD will display “OL”.
Before measuring resistance, switch off the power supply of the circuit, and fully discharge all capacitors.
When measuring low resistance, the test leads will produce 0.1Ω~0.3Ω measurement error.
To obtain accurate measurement, short-circuit the test leads and use the relative value measurement (REL) mode.
If the resistance is not less than 0.5Ω when the test leads are short-circuited, please check if the test leads are loose or abnormal.
When measuring high resistance, it is normal to take a few seconds to stabilize the reading.
Continuity Test
Wire Connection
Diagram
OPERATION
Steps of
Measurement
1.
Insert the red test lead into the or terminal, and black test lead into the COM terminal.
2.
Turn the function dial to the position.
or
3.
Short press the SELECT button to switch to continuity test.
4.
Touch the probes to the test points in the circuit.
5.
Measured resistance <50Ω: The circuit is in good conduction status; the buzzer beeps continuously and the green indicator light is on.
25
26
Caution
GDM-541/533 User Manual
Use caution when working with voltages above AC 30Vrms, 42Vpeak or DC 60V. Such voltages pose a shock hazard.
Before testing continuity, switch off the power supply of the circuit, and fully discharge all capacitors.
Diode Test
Wire Connection
Diagram
OPERATION
Steps of
Measurement
1.
Insert the red test lead into the or terminal, and black test lead into the COM terminal.
2.
Turn the function dial to the position.
or
3.
Short press the SELECT button to switch to diode test if required.
4.
Connect the red probe with the diode anode, and black probe with the diode cathode.
5.
Read the forward bias value on the display.
27
GDM-541/533 User Manual
Caution
6.
Measured value <0.12V: The diode may be damaged; the red indicator light is on.
Measured value within 0.12V~2V: The diode is normal; the green indicator light is on (for reference only).
7.
If the diode is open or its polarity is reversed, the LCD will display “OL”. For silicon PN junction, the normal value is generally about
500~800 mV.
Use caution when working with voltages above AC 30Vrms, 42Vpeak or DC 60V. Such voltages pose a shock hazard.
Before testing the diode, switch off the power supply of the circuit, and fully discharge all capacitors.
28
Capacitance Measurement
Wire Connection
Diagram
OPERATION
Steps of
Measurement
1.
Insert the red test lead into the or terminal, and black test lead into the COM terminal.
2.
Turn the function dial to the position.
or
3.
Short press the SELECT button to switch to capacitance measurement.
4.
Touch the probes to the capacitor pins.
5.
Read the capacitance value on the display after it gets steady.
29
30
Caution
GDM-541/533 User Manual
Use caution when working with voltages above AC 30Vrms, 42Vpeak or DC 60V. Such voltages pose a shock hazard.
Before measuring, fully discharge all capacitors (especially high-voltage capacitors) to avoid damage to the meter and user.
If the measured capacitor is short-circuited or the capacitance exceeds the maximum range, the LCD will display “OL”.
When measuring high capacitance, it is normal to take a few seconds to stabilize the reading.
For small capacitance measurement, the REL mode should be used to avoid the influence coming from distributed capacitance so as to obtain the correct reading.
OPERATION
Transistor Magnification (hFE) Measurement
(GDM-541)
Wire Connection
Diagram
Steps of
Measurement
1.
Turn the function dial to the hFE position.
2.
Insert the adapter socket into the input terminals.
3.
Insert the three pins of the transistor under test into the corresponding holes of the adapter socket.
4.
Read the magnification of the measured transistor.
31
GDM-541/533 User Manual
Frequency/Duty Ratio Measurement
Wire Connection
Diagram
Steps of
Measurement
Caution
1.
Insert the red test lead into the or terminal, and black test lead into the COM terminal.
2.
Turn the function dial to the position.
3.
Short press the button to switch to frequency/duty ratio measurement if required.
4.
Read the frequency/duty ratio value on the display.
Use caution when working with voltages above AC 30Vrms, 42Vpeak or DC 60V. Such voltages pose a shock hazard.
32
OPERATION
Temperature Measurement (GDM-533)
Wire Connection
Diagram
Steps of
Measurement
1.
Turn the function dial to the °C°F position.
2.
Insert the K-type thermocouple into the adapter socket, and then insert the adapter socket into the input terminals.
3.
Bring the temperature sensing end of the thermocouple close to the object surface under test.
4.
Read the Celsius temperature value on the display after it gets steady.
5.
Short press the SELECT button to switch between °C and °F.
33
34
Caution
GDM-541/533 User Manual
Only K-type thermocouple is applicable.
The LCD displays “OL” when the meter is turned on.
The measured temperature should be less than 230°C/446°F (°F = °C × 1.8 + 32)
AC/DC Current Measurement
Wire Connection
Diagram
OPERATION
Steps of
Measurement
1.
Insert the red test lead into the mA/μA or A terminal, and black test lead into the COM terminal.
2.
Turn the function dial to the position.
, , or
3.
Short press the SELECT button to switch to
AC/DC current measurement if required.
4.
Connect the test leads with the measured load or power supply in series.
5.
Read the current value on the display (if the current is >10A, the red indicator light will be on and the buzzer will sound an alarm).
35
GDM-541/533 User Manual
Caution
6.
When measuring AC current, short press the
button to display the frequency/duty ratio of the measured current.
To prevent possible electric shock, fire, or personal injury, switch off the power supply of the circuit, and then connect the meter with the circuit in series before measuring the current.
If the range of the measured current is unknown, select the maximum range and then accordingly reduce.
There are fuses inside mA/μA and A input terminals. Do not connect the test leads with any circuit in parallel.
When the measured current is >5A, each measurement time should be ≤10s and the rest inte rval should be ≥15 minutes.
When the temperature in th e meter is ≥75°C after measurement of large current, the yellow indicator light will be on, the buzzer will beep, and the LCD will display “CUT”. When the temperature drops to <40°C, the yellow indicator light will be off, and the measurement can be made.
36
OPERATION
Non-Contact Voltage (NCV) Detection
Wire Connection
Diagram
Steps of
Measurement
1.
Turn the function dial to the NCV position.
2.
Bring the NCV detector (top left corner of the meter) close to the wire (AC) under test.
3.
If the voltage of the wire is ≥50Vrms
(frequency: 50Hz/60Hz), the red indicator light will be on and the buzzer will beep. If no voltage is detected, the LCD will display
“EF”. As the intensity of the detected voltage increases, more segments “ ” will be displayed, and the frequency for buzzer beeping and red indicator light flashing will be higher.
37
38
Caution
GDM-541/533 User Manual
The detected voltage level varies with the distance between the NCV detector and the wire under test.
The detected voltage level is for reference only, not for specific measurement. The frequency of the detected voltage should be
50Hz/60Hz.
Hold the meter casing for non-contact voltage detection.
USB Data Transmission
Wire Connection
Diagram
OPERATION
Steps of
Measurement
Figure A Figure B
1.
Pull out the USB sealing cover at the back of the meter (Figure A).
2.
Insert the USB communication module into the USB access port of the meter and the LCD will display “ ” (Figure B).
3.
If USB data transmission is not needed during measurement, long press the button or pull out the USB module to disable data transmission, and “ ” will disappear.
4.
To recover this function, long press the button or insert the USB module.
5.
The USB communication software can be downloaded from the official website of
GW INSTEK (www.gwinstek.com).
39
GDM-541/533 User Manual
Others
Steps of
Measurement
1.
Auto power off: During measurement, if there is no operation for 15 minutes, the meter will automatically shut down to save power; before the automatic shutdown, the buzzer will beep for warning. Users can wake the meter up by pressing the SELECT button. To disable the auto-off function, press and hold the SELECT button in the off state, and then turn on the meter. To recover the function, restart the meter.
2.
Buzzer alarm during measurement: When the input voltage >1000V or current >10A, the buzzer will sound an alarm.
3.
Low battery indication: When the battery voltage is ≤4.6V ±0.2V, “ ” will be displayed.
40
SPECIFICATIONS
S
PECIFICATIONS
General Specifications
1
2
3
4
Max voltage between the input terminal and COM terminal: Please refer to the description of input protection voltage for each range. mA/ μ A input terminal protection: (CE) 600mA 1000V fast-acting fuse,
Φ 6x32mm
A input terminal protection: (CE) 11A 1000V fast-acting fuse, Φ 10x38mm
Max display: 22000 ( GDM-541 ), 6000 ( GDM-533 )
5 Analog bar: 46 segments ( GDM-541 ) (conversion rate: 30 times/s), 31 segments ( GDM-533 )
6
7
8
9
Refresh rate: 2~3 times/s
Range: Auto/Manual
Polarity display: Auto
Over-range Indication: OL
10 Low battery indication: “ ” is displayed.
11 Operating temperature: 0°C~40°C (32°F~104°F)
12 Storage temperature: -10°C~50°C (14°F ~122°F)
13 Relative humidity: ≤ 75% at 0˚C~30˚C; ≤ 50% at 30˚C~40˚C
14 Operating altitude: ≤ 2000m
15 Electromagnetic compatibility: Conforms to EN61326-1:2006 and
EN61326-2-2:2006 standards
16 Battery: 4×1.5V AAA
17 Dimensions: 186mm×89mm×49mm
18 Weight: 420g (GDM-541), 400g (GDM-533) (with battery)
19 Safety standard: IEC 61010-1: CAT III 1000V/CAT IV 600V
20 Certification: CE
21 Pollution degree: 2
22 Information of usage: Indoor and outdoor
41
GDM-541/533 User Manual
Electrical specifications
Accuracy: ± (a% of reading + b digits), 1 year warranty
Ambient temperature: 23°C ± 5°C (73.4°F ± 9°F) Relative humidity: ≤75%
Caution
To ensure measurement accuracy, the operating temperature should be within
18°C~28°C and the fluctuation range should be within ±1°C. When the temperature is
<18°C or >28°C, add temperature coefficient error: 0.1 x (specified accuracy)/ °C.
Technical Specifications Index
DC Voltage ....................................................................................... 43
AC Voltage ........................................................................................ 44
AC+DC Voltage .............................................................................. 46
Resistance .......................................................................................... 47
Continuity and Diode ...................................................................... 48
Transistor Magnification (GDM-541) .......................................... 48
Capacitance ....................................................................................... 49
Temperature (GDM-533) ............................................................... 50
DC Current ....................................................................................... 50
AC Current ........................................................................................ 51
Frequency/Duty Ratio .................................................................... 53
Indicator Light .................................................................................. 54
42
SPECIFICATIONS
DC Voltage
Resolution
0.01mV
0.1mV
1mV
10mV
0.1V
GDM-541
Range
220.00mV
2.2000V
22.000V
220.00V
1000.0V
Accuracy
± (0.1%+5)
± (0.05%+5)
± (0.1%+5)
Resolution
0.01mV
0.1mV
0.001V
0.01V
0.1V
1V
GDM-533
Range
60.00mV
600.0mV
6.000V
60.00V
600.0V
1000V
Accuracy
± (0.8%+5)
± (0.8%+3)
± (0.5%+3)
± (0.5%+3)
± (1.0%+3)
Input impedance: About 1GΩ for mV range, about 10MΩ for other ranges
Accuracy guarantee: 1%~100% of range; short circuit allows least significant digit ≤5
Max input voltage: 1000V (if the voltage is >1000V, the red indicator light will be on and the buzzer will sound an alarm; if the voltage is >1010V , the LCD will display “OL”)
Overload protection: 1000V
43
GDM-541/533 User Manual
AC Voltage
Range
GDM-541
Resolution Frequency Response
220.00mV 0.01mV
40Hz~1kHz
1kHz~10kHz
40Hz~1kHz
2.2000V 0.1mV 1kHz~10kHz
22.000V 1mV
40Hz~100Hz (LPF)
40Hz~1kHz
1kHz~10kHz
40Hz~100Hz (LPF)
40Hz~1kHz
220.00V
1000.0V
10mV
0.1V
1kHz~10kHz
40Hz~100Hz (LPF)
40Hz~1kHz
1kHz~10kHz
40Hz~100Hz (LPF)
Accuracy
± (1.0%+10)
± (1.5%+30)
± (0.8%+10)
± (1.2%+50)
± (1.2%+50)
± (0.8%+10)
± (1.2%+50)
± (1.8%+50)
± (0.8%+10)
± (2.0%+50)
± (2.0%+50)
± (1.2%+10)
± (3.0%+50)
Range
60.00mV
600.0mV
GDM-533
Resolution Frequency Response Accuracy
0.01mV
0.1mV
40Hz~1kHz
40Hz~1kHz
± (1.2%+5)
± (1.2%+5)
6.000V
60.00V
0.001V
0.01V
600.0V
1000V
0.1V
1V
LoZ ACV 600.0V 0.1V
LoZ ACV 1000V 1V
40Hz~1kHz
40Hz~1kHz
40Hz~1kHz
40Hz~1kHz
40Hz~1kHz
40Hz~1kHz
± (1.0%+3)
± (1.0%+3)
± (1.0%+3)
± (1.2%+5)
± (2.0%+5)
± (2.0%+5)
44
SPECIFICATIONS
Input impedance: About 10MΩ
Display: True RMS
Frequency response: 40Hz~1kHz ( GDM-533 ), 40Hz~10kHz
( GDM-541 )
Accuracy guarantee ( GDM-533 ): 2%~100% of 60mV range, 1%~100% of other ranges; short circuit allows least significant digit ≤3
Accuracy guarantee ( GDM-541 ): 1%~100% of range at
40Hz~1kHz, 10%~100% of range at 1kHz~10kHz; short circuit allows least significant digit ≤10
The AC crest factor can be ≤3.0 at 3000 counts, an d can only be
≤1.5 at 6000 counts. The additional error should be added according to the crest factor of a non-sinusoidal wave as follows ( GDM-533 ): a) Add 4% when crest factor is 1~2 b) Add 5% when crest factor is 2~2.5 c) Add 7% when crest factor is 2.5~3
The AC crest factor can be ≤2.0 at 10000 counts, and can only be
≤1 at 22000 counts. The additional error should be added according to the crest factor of a non-sinusoidal wave as follows ( GDM-541 ): a) Add 4% when crest factor is 1~2 b) Add 5% when crest factor is 2~2.5 c) Add 7% when crest factor is 2.5~3
Frequency measurement range: 40Hz~1kHz ( GDM-533 ),
40Hz~10kHz ( GDM-541 ); input amplitude: ≥10% of voltage range Duty ratio is for reference only.
Frequency accuracy: ± (0.1%+4), resolution: 0.1Hz (GDM-533)
Frequency accuracy: ± (0.01%+5), resolution: 0.01Hz (GDM-541)
Max input voltage: 1000V (if the voltage is >1000V, the red indicator light will be on and the buzzer will sound an alarm; if the voltage is >1010V, the LCD will display “OL”)
Overload protection: 1000V
45
GDM-541/533 User Manual
AC+DC Voltage
Range
2.2000V
22.000V
220.00V
1000.0V
GDM-541
Resolution Frequency Response
0.1mV 40Hz~500Hz
1mV
10mV
0.1V
40Hz~500Hz
40Hz~500Hz
40Hz~500Hz
Accuracy
± (1.8%+70)
± (1.8%+70)
± (1.8%+70)
± (4.0%+70)
AC voltage display: True RMS
Input impedance: About 10MΩ
Accuracy guarantee: 10%~100% of range
For AC voltage, short circuit allows least significant digit ≤200
Overload protection: 1000V
46
SPECIFICATIONS
Resistance
Resolution
0.01Ω
0.1Ω
1Ω
10Ω
100Ω
1kΩ
10kΩ
GDM-541
Range
220.00Ω
2.2000kΩ
22.000kΩ
220.00kΩ
2.2000MΩ
22.000MΩ
220.00MΩ
Accuracy
± (0.5+10)
± (0.8+10)
± (1.5%+10)
± (3.0%+50)
Resolution
0.1Ω
1Ω
10Ω
100Ω
1kΩ
10kΩ
GDM-533
Range
600.0Ω
6.000kΩ
60.00kΩ
600.0kΩ
6.000MΩ
60.00MΩ
Accuracy
± (1.2%+2)
± (1.0%+2)
± (1.2%+2)
± (2.0%+5)
Measurement result = displayed value – resistance of shorted test leads
Open circuit voltage: About 1V
Accuracy guarantee: 1%~100% of range
Overload protection: 1000V
47
GDM-541/533 User Manual
Continuity and Diode
Range Resolution
0.1Ω
0.001V
Remarks
Broken circuit: Resistance ≥70Ω, no beep
Wellconnected circuit: Resistance <50Ω, audio/visual alarm
Open circuit voltage: About 3V
For normal diodes, the buzzer will beep once.
For short circuit, the buzzer will beep for a long time.
Overload protection: 1000V
When the forward voltage drop is within 0.12V~2V, the buzzer will beep once. When the forward voltage drop is <0.12V, the buzzer will beep for a long time.
Transistor Magnification (GDM-541)
Range Resolution
1000β 1β
GDM-541
Remarks
Ib0: About 1.8μA; Vce: About 2.5V
The displayed value of the transistor magnification is for reference only.
48
SPECIFICATIONS
Capacitance
Range
22.000nF
220.00nF
2.2000μF
22.000μF
220.00μF
2.2000mF
22.000mF
220.00mF
Range
60.00nF
600.0nF
6.000μF
60.00μF
600.0μF
6.000mF
60.00mF
GDM-541
Resolution
1pF
10pF
100pF
1nF
10nF
100nF
1μF
10μF
10pF
1nF
10nF
1μF
10μF
GDM-533
Resolution
100pF
100nF
Accuracy
± (3.0%+5)
± (4.0%+5)
± (10%+5)
± (20%+5)
Accuracy
± (3%+5)
± (10%+5)
Overload protection: 1000V
Measurement result = displayed value – capacitance of opencircuit test leads
For capacitance ≤1μF ( GDM-533 ) and ≤22nF ( GDM-541 ), it is recommended to use the REL mode to deduct the open circuit reading.
Accuracy guarantee: 1%~100% of range
For range s of 2.2μF and below, when the accuracy is ≤3%, 10 digits should be added ( GDM-541 ).
For ranges of 60mF ( GDM-533 ) and 220mF ( GDM-541 ), the measurement time is about 20s.
49
GDM-541/533 User Manual
Range
220.00μA
2200.0μA
22.000mA
220.00mA
20.000A
Range
600.0μA
6000μA
60.00mA
600.0mA
6.000A
20.00A
Temperature (GDM-533)
-40~1000°C
-40~1832°F
Range
-40~0°C
0~300°C
300~1000°C
-40~32°F
32~572°F
572~1832°F
Resolution
0.1°C~1°C
0.2°F~2°F
Accuracy
± (1.0%+3°C)
± (1.0%+2°C)
± (1.0%+3°C)
± (1.0%+6°F)
± (1.0%+4°F)
± (1.0%+6°F)
The measured temperature should be less than 230°C/446°F.
DC Current
GDM-541
Resolution
0.01μA
0.1μA
1μA
10μA
1mA
GDM-533
Resolution
0.1μA
1μA
10μA
0.1mA
1mA
10mA
Accuracy
± (0.5%+10)
± (1.2%+50)
Accuracy
± (1.0%+2)
± (1.0%+3)
± (1.2%+5)
50
SPECIFICATIONS
Overload protection: mA/μA range: F1 Fuse 600mA 1000V Φ6x32mm
A range: F2 Fuse 11A 1000V Φ10x38mm
Open circuit allows least significant digit ≤5 ( GDM-533 ) and ≤10
( GDM-541 ).
Accuracy guarantee: 1%~100% of range
AC Current
Range
220μA
2200μA
22mA
220mA
20A
GDM-541
Resolution Frequency Response
0.01μA
40Hz~1kHz
1kHz~10kHz
0.1μA
1μA
10μA
40Hz~1kHz
1kHz~10kHz
40Hz~1kHz
1kHz~10kHz
40Hz~1kHz
1mA
1kHz~10kHz
40Hz~1kHz
1kHz~10kHz
Range
600.0μA
6000μA
60.00mA
600.0mA
6.000A
20.00A
Resolution
0.1
μA
1μA
10μA
0.1mA
1mA
10mA
GDM-533
Frequency Response
40Hz~1kHz
40Hz~1kHz
40Hz~1kHz
40Hz~1kHz
40Hz~1kHz
40Hz~1kHz
Accuracy
± (0.8%+10)
± (3%+50)
± (0.8%+10)
± (3%+50)
± (1.2%+10)
± (3%+50)
± (1.2%+10)
± (3%+50)
± (1.2%+10)
± (3%+50)
Accuracy
± (1.2%+5)
± (1.5%+5)
± (2.0%+5)
51
GDM-541/533 User Manual
Display: True RMS
Frequency response: 40Hz~1kHz ( GDM-533 ), 40Hz~10kHz
( GDM-541 )
Accuracy guarantee ( GDM-533 ): 5%~100% of 600.0μA range,
1%~100% of other ranges; open circuit allows least significant digit ≤5
Accuracy guarantee (GDM-541): 1%~100% of range at
40Hz~1kHz, 10%~100% of range at 1kHz~10kHz (the minimum measured current at μA ranges is 30μA); open circuit allows least significant digit ≤10
The AC crest factor can be ≤3.0 at 3000 counts, and can only be
≤1.5 at 6000 counts. The additional error should be added according to the crest factor of a non-sinusoidal wave as follows
( GDM-533 ): a) Add 4% when crest factor is 1~2 b) Add 5% when crest factor is 2~2.5 c) Add 7% when crest factor is 2.5~3
The AC crest factor can be ≤2.0 at 10000 counts, and can only be
≤1 at 22000 counts. The additional error should be added according to the crest factor of a non-sinusoidal wave as follows
( GDM-541 ): a) Add 4% when crest factor is 1~2 b) Add 5% when crest factor is 2~2.5 c) Add 7% when crest factor is 2.5~3
Frequency measurement range: 40Hz~1kHz ( GDM-533 ),
40Hz~10kHz ( GDM-541 ); input amplitude: ≥50% of current range. Duty ratio is for reference only.
Frequency accuracy: ± (0.1%+4), resolution: 0.1Hz (GDM-533)
Frequency accuracy: ± (0.01%+5), resolution: 0.01Hz (GDM-541)
Overload protection: Same as that for DC current
52
SPECIFICATIONS
Frequency/Duty Ratio
Accuracy
± (0.01%+5)
± (2%+5)
Accuracy
± (0.1%+4)
± (2%+5)
Range
10Hz~220MHz
0.1%~99.9%
GDM-541
Resolution
0.01Hz~0.01MHz
0.1%
Range
GDM-533
Resolution
10.00Hz~10.00MHz 0.01Hz~0.01MHz
0.1%~99.9% 0.1%
Frequency input amplitude:
≤100kHz: 200mVrms ≤ input amplitude ≤ 20Vrms
>100kHz~1MHz: 600mVrms ≤ input amplitude ≤ 20Vrms
>1MHz ( GDM-533 ): 1Vrms ≤ input amplitude ≤ 20Vrms
>1MHz~40MHz ( GDM-541 ): 1Vrms ≤ input amplitude ≤ 20Vrms
>40MHz ( GDM-541 ): Not specified
Duty ratio measurement is only applicable to square waves.
1Vpp ≤ input amplitude ≤ 20Vpp
Frequency ≤10kHz, duty ratio: 10.0% ~ 90.0%
Overload protection: 1000V
53
GDM-541/533 User Manual
Indicator Light
Function
NCV
Continuity
Diode
AC/DC voltage
Status
Off
On, red
Off
On, red
On, green
Off
On, red
On, green
Off
On, red
Off
On, red
Current
Internal temperature during
AC/DC current measurement
Off
On, yellow
Description
<36V
50V~1000V (the red indicator light flashes from slow to fast)
OL
No continuity (≥70Ω)
Continuity (<50Ω)
>2V
Breakdown (<0.12V)
Conduction (0.12V~2V)
≤1000V
>1000V
≤10A
>10A
The temperature in the meter drops to <40°C after measurement of large current.
The temperature in the meter is
≥75°C after measurement of large current.
54
MAINTENANCE
M
AINTENANCE
Before opening the rear cover or battery cover of the meter, switch off the power supply and remove the test leads.
Caution
General Maintenance
Clean the meter casing with a damp cloth and mild detergent.
Do not use abrasives or solvents!
If there is any malfunction, stop using the meter and send it for maintenance.
The maintenance and service must be implemented by qualified professionals or designated departments.
55
GDM-541/533 User Manual
Battery/Fuse Replacement
Battery: 4×1.5V AAA batteries
Fuse: F1 Fuse 600mA 1000V Φ6x32mm (mA/μA input terminal)
F2 Fuse 11A 1000V Φ10x38mm (A input terminal)
When “ ” is displayed, please replace the batteries in time to ensure measurement accuracy.
Resistance measurement can be used to check the built-in
600mA and 11A fuses. Operation: Insert the red test lead into the or terminal. Insert the red probe into the mA/μA input terminal to measure the resistance. If the LCD displays
“OL”, the 600mA fuse is blown. Insert the red probe into the A input terminal to measure the resistance. If the LCD displays
“OL”, the 11A fuse is blown.
Steps of
Replacement
1.
Turn the function dial to the "OFF" position, and remove the test leads.
2.
Unscrew and remove the battery cover to replace the batteries and fuses.
56
advertisement
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Related manuals
advertisement