Beta 1760/A User manual

ENFRAIT
DIGITAL MULTIMETER MOD. 1760/A
MULTIMÈTRE NUMÉRIQUE MOD. 1760/A
MULTIMETRO DIGITALE MOD. 1760/A
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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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