Beta 1760/A User manual
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DIGITAL MULTIMETER MOD. 1760/A
1. SAFETY INFORMATION
WARNING!
To ensure safe operation, and in order to exploit to the full the functionality of the
meter, please follow the directions in this section carefully.
This multimeter has been designed according to IEC-1010 concerning electronic measuring in-
struments with an overvoltage category (CAT II) and pollution 2.
Follow all safety and operating instructions to ensure that the meter is used safely and is kept in
good operating condition.
1.1 PRELIMINARY
• When using the meter, the user must observe all normal safety rules concerning:
>protection against the dangers of electrical current
>protection of the meter against misuse
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• When the meter is delivered, check that it has not been damaged in transit.
• When poor condition under harsh preservation or shipping conditions caused, inspect and con-
firm this meter without delay.
• Test leads must be in good condition. Before using verify that the insulation on test leads is not
damaged and/or the leads wire is not exposed.
• Full compliance with safety standards can be guaranteed only if used with test leads supplied.
If necessary, they must be replaced with the same model or same electric ratings.
1.2 DURING USE
• Never exceed the protection limit values indicated in specifications for each range of measure-
ment.
• When the meter is linked to a measurement circuit, do not touch unused terminals.
• When the value scale to be measured is unknown beforehand, set the range selector at the
highest position.
• Do not measure voltage if the voltage on the terminals exceeds 1000V above earth ground.
• Always be careful when working with voltages above 60V DC or 30V AC rms, keep fingers
behind the probe barriers while measuring.
• Before rotating the range selector to change functions, disconnect test leads from the circuit
under test.
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• Never connect the meter leads across a voltage source while the function switch is in the cur-
rent, resistance, diode or continuity mode. Doing so can damage the meter.
• When carrying out measurements on TV or switching power circuits always remember that
there may be high amplitude voltages pulses at test points, which can damage the meter.
• Never perform resistance measurements on live circuits.
• Never perform capacitance measurements unless the capacitor to be measured has been dis-
charged fully.
• If any faults or abnormalities are observed, the meter can not be used any more and it has to be
checked out.
• Never use the meter unless the rear case is in place and fastened fully.
• Please do not store or use meter in areas exposed to direct sunlight, high temperature, humidi-
ty or condensation.
1.3 SYMBOLS
Important safety information, refer to the operating manual.
Dangerous voltage may be presence.
Double insulation (Protection class II).
Earth ground.
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1.4 MAINTENANCE
• Please do not attempt to adjust or repair the meter by removing the rear case while voltage is
being applied. A technician who fully understands danger involved should only carry out such
actions.
• Before opening the battery cover of the meter, always disconnect test leads from all sources of
electric current.
• For continue protection against fire, replace fuse only with the specified voltage and current
ratings: F1: F 200mA/250V (quick acting), F2: F 10A/250V (quick acting)
• Do not use abrasives or solvents on the meter, use a damp cloth and mild detergent only.
• Always set the power switch to the OFF position when the meter is not in use.
• If the meter is to be stored for a long period of time, the batteries should be removed to pre-
vent damage to the unit.
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2. DESCRIPTION
2.1 NAMES OF COMPONENTS
1LCD Display
2Power Switch (POWER)
3Back Light Switch (✲)
4Data Hold Switch (H)
5Rotary Switch
6Input Jack
7Case
8Battery Door
9Brace
Screw
2.2 FUNCTION AND RANGE SELECTOR
>This meter is a portable professional measuring instrument with large LCD and back light
easily reading.
1
2
3
4
5
6
7
8
9
10
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>This meter has the function of preventing the test leads from connecting wrongly. The input
socket for red test leads is arranged with proper functions and ranges, when the transform
switch can't be rotated, stop rotating. It means the selected range isn't suitable with position
of the red leads socket. Pull out the red leads and then select the range required, this provide
protection for meter to avoid damage by operation improperly.
>This meter has function of data hold.
>A rotary switch is used to select functions as well as ranges.
3. SPECIFICATIONS
Accuracy is specified for a period of year after calibration and at 18°C to 28°C (64°F to 82°F)
with relative humidity to 75%.
3.1 GENERAL SPECIFICATIONS
• It includes 30 ranges of function
• Overrange protection for all ranges
• Operating Altitude: 2000 metres (7000 ft.) maximum
• Max. Voltage between Terminals and Earth Ground: 1000V DC or AC (peak value)
• Fuse Protection: F1: 200mA /250V; F2: 10A/250V
• Display: 28 mm LCD, word is 28mm high
• Max. Show Value: 1999 (3½)
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• Polarity Indication: “-” indicates negative polarity
• Overrange Indication: Display “1” or “-1”
• Sampling Time: approx. 0.4 second
• Power Supply: 9V battery, 6F22 or NEDA 1604
• Low Battery Indication: displayed
• Temperature Factor: <0.1 x Accuracy/°C
• Operating Temperature: 0°C to 40°C (32°F to 104°F)
• Storage Temperature: -10°C to 50°C (10°F to 122°F)
• Dimension: 191x82x36mm (without holster)
• Weight: approximate 280g (including battery)
3.2 ELECTRICAL SPECIFICATIONS
Circumstance Temperature: 23+5°C; Relative Humidity: <70%
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3.2.1 DC Voltage
>Input Impedance: 10MΩ
>Overload Protection: 200mV range: 250V DC or rms AC
2V-1000V ranges: 1000V DC or 700V rms AC
NOTE:
At the little voltage range, the meter will show un steady reading when
test leads haven't reach the circuit, it's normal because the meter is very sen-
sitivity.
When test leads touch the circuit, you can get the true reading.
Range Resolution Accuracy
200mV 0.1mV ±(0.5% of rdg +1 digit)
2V 1mV ±(0.5% of rdg +3 digits)
20V 10mV ±(0.5% of rdg +3 digits)
200V 100mV ±(0.5% of rdg +3 digits)
1000V 1V ±(0.5% of rdg +3 digits)
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3.2.2 AC Voltage
>Input Impedance: 10MΩ
>Overload Protection: 200mV range: 250V DC or rms AC
2V-1000V ranges: 1000V DC or 700V rms AC
>Frequency Range: 40 to 400Hz
>Test On 60Hz/50Hz
>Response: Average, calibrated in rms of sine wave
NOTE: At the little voltage range, the meter will show un steady reading when
test leads haven't reach the circuit, it's normal because the meter is very sen-
sitivity.
When test leads touch the circuit, you can get the true reading.
Range Resolution Accuracy
200mV 0.1mV ±(1.2% of rdg +5 digits)
2V 1mV ±(1.0% of rdg +5 digits)
20V 10mV ±(1.0% of rdg +5 digits)
200V 100mV ±(1.0% of rdg +5 digits)
700V 1V ±(1.2% of rdg +5 digits)
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3.2.3 DC Current
>Overload Protection: 2mA to 200mA Ranges: F1:F200mA/250V fuse
10A Range: F2:F10A/250V fuse
>Max. Input Current: mA Jack: 200mA
10A Jack: 10A
>Voltage Drop: 200mV
Range Resolution Accuracy
2mA 1µA ±(1.0% of rdg +3 digits)
20mA 10µA ±(1.0% of rdg +3 digits)
200mA 100µA ±(1.5% of rdg +5 digits)
10A 10mA ±(2.0% of rdg +10 digits)
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3.2.4 AC Current
>Overload Protection: 2mA to 200mA Ranges: F1:F 200mA/250V fuse
10A Range: F2:F10A/250V fuse
>Max. Input Current: mA Jack: 200mA
10A Jack: 10A
>Voltage Drop: 200mV (full range)
>Frequency Range: 40 to 400Hz
>Test on 60Hz/50Hz
>Response: Average, calibrated in rms of sine wave
Range Resolution Accuracy
2mA 1µA ±(1.2% of rdg +5 digits)
200mA 100µA ±(2.0% of rdg +5 digits)
10A 10mA ±(3.0% of rdg +10 digits)
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3.2.5 Resistance
>Open Circuit Voltage: 200MΩrange: 3V
Other ranges: less than 700mV
>Overload Protection: 250V DC or rms AC
NOTE: On 200MΩrange, if short input, display will read 1MΩ.
This 1MΩshould be subtracted from measurement results.
Range Resolution Accuracy
200Ω0.1Ω±(1.0% of rdg +10 digits)
2KΩ1Ω±(1.0% of rdg +1 digit)
20KΩ10Ω±(1.0% of rdg +1 digit)
200KΩ100Ω±(1.0% of rdg +1 digit)
2MΩ1KΩ±(1.0% of rdg +1 digit)
20MΩ10KΩ±(1.0% of rdg +5 digits)
200MΩ100KΩ±(5.0% of (rdg - 10 digits) +20 digits)
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3.2.6 Capacitance
3.2.7 Diode
>Overload Protection: 250V DC or rms AC
>Forward DC Current: approximate 1mA
>Reversed DC Voltage: approximate 2.8V
Range Resolution Accuracy
2nF 1pF ±(4.0% of rdg +3digits)
20nF 10pF ±(4.0% of rdg +3digits)
200nF 0.1nF ±(4.0% of rdg +3digits)
2µF 1nF ±(4.0% of rdg +3digits)
20µF 10nF ±(4.0% of rdg +3digits)
Range Resolution Function
1mV Display: read approximate forward voltage of diode
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3.2.8 Continuity
>Overload Protection: 250V DC or rms AC
>Open Circuit Voltage: approximate 2.8V
3.2.9 Frequency
>Overload Protection: 250V DC or rms AC
>Sensitivity: 200mV rms and input no more 10V rms
Range Function
.)))Built-in buzzer will sound, if resistance is lower than 70Ω
Range Resolution Accuracy
20KHz 10Hz ±(1.5% of rdg +10 digits)
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3.2.10 Temperature
>Overload Protection: 250V DC or rms AC
4. OPERATING INSTRUCTION
4.1 DATA HOLD
If you need hold when measuring, you can put on “H”, it will hold the reading; if you put the
button again, data hold is not continue.
4.2 BACK LIGHT
If the light is dark to make the reading difficult when measuring, you can put on “✲” to open the
back light.
NOTE: LED is the main source of back light. Its working current is large, al-
though the meter has the timer equipment (time is 5 seconds and it will off
automatically after 5 seconds); often use back light will shorten the battery
Range Resolution Accuracy
-20° to 1000°C 1°C
-20°C to 0°C
0°C to 400°C
400°C to 1000°C
±(5.0% of rdg +5 digits)
±(1.0% of rdg +3 digits)
±(2.0% of rdg +3 digits)
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life, you'd better not to use the back light so frequently if it's not necessary.
When the battery voltage is less than 7V, it will show ; but if you use back
light at the same time, maybe will come up even if the battery voltage is
more than 7V, because the working current is higher and the voltage will de-
cline. You need not replaced the battery. When you use normally (back light
is not using), will not show up.
4.3 PREPARATION FOR MEASUREMENT
1. Put on the “POWER” switch. If the battery voltage is less than 7V, display will show
, the battery should be changed as this time.
2. The besides the input jack shows that the input voltage or current should be less
than specification on the sticker of the meter to protect the inner circuit from damag-
ing.
3. Select a range proper for the item to be measured and set the rotary switch accord-
ingly.
4.4 MEASURING VOLTAGE
1. Connect the black test lead to the COM jack and the red test lead to the V/Ωjack.
2. Set the rotary switch at the desired V or V~ range position.
3. Connect test leads across the source or load under measurement.
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4. You can get reading from LCD. The polarity of the red lead connection will be indi-
cated along with the voltage value when making DC voltage measurement.
NOTE:
>When only the figure “1” or “-1” is displayed, it indicates overrange situation and the higher
range has to be selected.
>When the value scale to be measured is unknown beforehand, set the range selector at the
highest position.
>means you can't input the voltage which more than 1000V DC or 700V rms AC, it's
possible to show higher voltage, but it's may destroy the inner circuit.
>Pay attention not to get an electric shock when measuring high voltage.
4.5 MEASURING CURRENT
1. Connect the black test lead to the COM jack and the red test lead to the mA jack for
a maximum of 200mA current. For a maximum of 10A, move the red lead to the
10A jack.
2. Set the rotary switch at the desired A or A~ range position.
3. Connect test leads in series with the load under measurement.
4. You can get reading from LCD. The polarity of the red lead connection will be indi-
cated along with the voltage value when making DC Current measurement.
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NOTE:
>When only the figure “1” or “-1” is displayed, it indicates overrange situation and the higher
range has to be selected.
>When the value scale to be measured is unknown beforehand, set the range selector at the
highest position.
>means the socket of mA's maximum current is 200mA, 10A's maximum current is 10A,
over current will destroy the fuse.
4.6 MEASURING RESISTANCE
1. Connect the black test lead to the COM jack and the red test lead to the V/Ωjack.
2. Set the rotary switch at the desired Ωrange.
3. Connect test leads across the resistance under measurement.
4. You can get reading from LCD.
NOTE:
>When only the figure “1” is displayed, it indicates overrange situation and the higher range
has to be selected.
>For measuring resistance above 1MΩ, the meter may take a few seconds to get stable
reading.
>When the input is not connected, i.e. at open circuit, the figure “1” will be displayed for the
overrange condition.
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>When checking in-circuit resistance, be sure the circuit under test has all power removed
and that all capacitors have been discharged fully.
>At 200MΩrange display reading is around 10 counts when test leads are shorted. These
counts have to be subtracted from measuring results. For example, when measuring 100MΩ
resistance the display reading will be 101.0 and the correct measuring result should be
101.0-1.0 = 100.0MΩ.
4.7 MEASURING CAPACITANCE
1. Connect the black test lead to the COM jack and the red test lead to the V/Ωjack.
2. Set the rotary switch at the desired F range.
3. Before inserting capacitors under measurement into capacitance testing socket, be
sure that the capacitors has been discharged fully.
4. You can get reading from LCD.
5. When frequent capacitor testing is needed, put the plug of capacitor testing equip-
ment (spare parts) into COM and V/Ωand put the capacitor foot into two long
socket of capacitor testing equipment, capacitor testing is ready.
WARNING!
To avoid electrical shock, remove test leads from measurement circuits before
measuring the capacitance of a capacitor.
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