B&K Precision 2712 - Manual - Manual

OPERATING INSTRUCTIONS
MODEL 2712
DIGITAL MULTIMETER
SAFETY INFORMATION
The following safety information must be observed to ensure maximum personal
safety during the operation at this meter:
Use the meter only as specified in this manual or the protection provided by the
meter might be impaired.
Test the meter on a known voltage before using it to determine if hazardous
voltage is present.
Do not use the meter if the meter or test leads look damaged, or if you suspect
that the meter is not operating properly.
Never ground yourself when taking electrical measurements. Do not touch
exposed metal pipes, outlets, fixtures, etc., which might be at ground potential.
Keep your body isolated from ground by using dry clothing, rubber shoes, rubber
mats, or any approved insulating material.
Turn off power to the circuit under test before cutting, unsoldering, or breaking
the circuit. Small amounts of current can be dangerous.
Use caution when working above 60V dc or 30V ac rms. Such voltages pose a
shock hazard.
When using the probes, keep your fingers behind the finger guards on the
probes.
Measuring voltage which exceeds the limits of the multimeter may damage the
meter and expose the operator to a shock hazard. Always recognize the meter
voltage limits as stated on the front of the meter.
SPECIFICATIONS
Display: 4¾ digit liquid crystal display (LCD) with a maximum reading of 40000.
Analog bargraph: 40 segments with measurements 20 times per second.
Polarity: Automatic, positive implied, negative polarity indication.
Overrange: MSD(Most Significant Digit) blinks .
Zero: Automatic.
Low battery indication: The " " is
displayed when the battery voltage drops
below the operating level.
Measurement rate: 2 times per second, nominal.
Auto power off: Approx. 30 minutes.
Operating environment: 0℃ to 50℃ at < 70% relative humidity.
Storage temperature: -20℃ to 60℃ at < 80% relative humidity.
Accuracy: Stated accuracy at 23℃±5℃, <
75% relative humidity.
Temperature Coefficient: 0.1 x (specified accuracy) per ℃. (℃ to 18℃, 28℃
to 50
℃).
Altitude: 6561.7 feet (2000m).
Power: Single standard 9-volt battery, NEDA
1604, JIS 006P, IEC 6F22.
Battery life: 150 hours typical with carbon-zinc.
Dimensions: 165mm (H) x78mm (W) x42.5mm (D).
Weight: Approx. 10.0 oz.(285g) including holster.
Accessories: One pair test leads, one spare
fuse, 9V battery (installed), and Operating
Instructions.
DC VOLTS
Ranges: 400mV, 4V, 40V, 400V, 1000V
Resolution: 0.01mV
Accuracy: ± ( 0.15% rdg + 10 dgts) on 400mV range
± ( 0.1% rdg + 5 dgts) on 4V to 1000V ranges
Input impedance: 400mV: >3MΩ; 4V ~ 1000V:2.3MΩ
Overload protection: 1000VDC or 750VAC rms
AC VOLTS (TRUE RMS) (45Hz – 1kHz)
Ranges: 400mV, 4V, 40V, 400V, 750V
Resolution: 0.01mV
Accuracy:
± ( 1.2% rdg + 20dgts) 45 ~ 60Hz on 400mV to 400V ranges
± ( 1.5% rdg + 20 dgts) 60 ~ 500Hz on 4V range
± ( 1.5% rdg + 20dgts) 60 ~ 1kHz on 40V to 400V ranges
± ( 2.0% rdg + 20 dgts) 45 ~ 500Hz on 750V range
AC+DC VOLTS (TRUE RMS) (45Hz - 1kHz)
Ranges: 400mV, 4V, 40V, 400V, 750V
Resolution: 0.01mV
Accuracy:
± ( 1.5% rdg + 20dgts) 45 ~ 60Hz on 4V to 400V ranges
± ( 2.0% rdg + 20 dgts) 60 ~ 500Hz on 4V range
± ( 2.0% rdg + 20dgts) 60 ~ 1kHz on 40V to 400V ranges
± ( 2.0% rdg + 20 dgts) 45 ~ 500Hz on 750V range
Crest factor: ≤3
AC coupled true rms specified from 10% to 100% of range.
Input impedance: 400mV: >3MΩ; 4V ~750V:2.3MΩ
Overload protection: 1000VDC or 750VAC rms
CURRENT
Ranges: 40mA, 400mA, 10A
Resolution: 1uA
DC accuracy:
± ( 0.5% rdg + 10 dgts) on 40mA to 400mA ranges
± ( 1.5% rdg + 10 dgts) on 10A range
AC accuracy: (TRUE RMS) (50Hz ~ 1kHz)
± ( 2.0% rdg + 30 dgts) on 40mA to 400mA ranges
± ( 2.5% rdg + 30 dgts) on 10A range
Crest factor: ≤3
AC coupled true rms specified from 10% to 100% of range.
Voltage burden: 0.2V on 40mA, 10A ranges
1V on 400mA range
Input protection: 0.5A/500V fast blow ceramic fuse
10A/500V fast blow ceramic fuse
10A Input: 10A for 60 seconds maximum followed by a 10 minute cooling period.
RESISTANCE
Ranges: 400Ω, 4kΩ, 40kΩ, 400kΩ, 4MΩ, 40MΩ
Resolution: 0.01Ω
Accuracy:
± ( 0.3% rdg + 15dgts) on 400Ω range
± ( 0.3% rdg + 5dgts) on 4kΩ to 400kΩ ranges
± ( 0.5% rdg +10 dgts) on 4MΩ range
± ( 1.5% rdg + 20 dgts) on 40MΩ range
Open circuit volts typical: 1.2Vdc (2.5Vdc on 400Ω range)
Overload protection: 500VDC or AC rms
CAPACITANCE
Ranges: 4nF, 40nF, 400nF, 4uF, 40uF
Resolution: 1pF
Accuracy: ± ( 3.0% rdg + 20 dgts) on 4nF range
± ( 3.0% rdg + 5 dgts) on 40nF to 400nF ranges
± ( 3.0% rdg + 5 dgts) on 4uF to 20uF ranges
± ( 5.0% rdg + 5 dgts) on 20uF to 40uF ranges
Overload protection: 500VDC or AC rms
FREQUENCY
Ranges: 100Hz, 1kHz, 10kHz, 100kHz, 500kHz
Resolution: 0.01Hz
Accuracy: ± ( 0.1% rdg + 10 dgts)
Sensitivity: 5Hz ~ 100kHz: >500mV rms, 100kHz ~ 500kHz: >1.5V rms
Minimum input range: >5Hz
Minimum pulse width: > 2us
Duty cycle limits: > 30% and < 70%
Overload protection: 500VDC or AC rms
DIODE TEST
Test current: 0.8mA (approximate)
Accuracy: ±(1.5% rdg + 10 dgts)
Open circuit volts: 3.0Vdc typical
Overload protection: 500VDC or AC rms
CONTINUITY
Audible indication: Less than 40Ω
Response time: 500ms
Overload protection: 500VDC or AC rms
fuse on 1.5V range.
OPERATION
Before taking any measurements, read the Safety Information Section. Always
examine the instrument for damage, contamination (excessive dirt, grease, etc.)
and defects.
Examine the test leads for cracked or frayed insulation. If any abnormal
conditions exist do not attempt to make any measurements.
MAX / MIN/PEAK
The "MAX" displays the maximum value of measurements. The "MIN" displays
the minimum value of measurements. press MAX/MIN/PEAK button for more
than 2 seconds on this button allows to switch PEAK mode. Press
MAX/MIN/PEAK button again to exit the mode.
PEAK mode: It is usable with AC voltage, AC current measurements.
PEAK mode response time: more than 1 ms.
, , Button
Use this button to select or , or , or range
position.
HOLD
Press [HOLD] button to toggle in and out of the Data Hold mode.
In the data hold mode, the " HOLD" annun-ciator is displayed and the last
reading is held on the display.
Press [HOLD] button again to release the hold and current readings are once
again displayed.
Backlight
Press the button to activate the backlight for approximately 60 second.
Manually Selecting Range
The meter also has a manual range mode. In manual range, you select and lock
the meter in a range. To manually select a range:
Press [RANGE] button to hold the selected
range. Subsequently pressing the [RANGE] button will select each range in
sequence from the lowest to highest range. Hold the button for 2 seconds to
return to the Autorange Mode.
Voltage Measurements
1.Connect the red test lead to ”VΩ” jack and
the black test lead to the ”COM” jack.
2.Set the Function/Range switch to the desired voltage type (AC or DC) and
range. If magnitude of voltage is not known, set switch to the highest range
and reduce until a satisfactory reading is obtained.
3.Connect the test leads to the device or circuit being measured.
4. For dc, a (-) sign is displayed for negative polarity; positive polarity is implied.
Current Measurements
1.Connect the red test lead to the (mA or 10A) jack and the black test lead to the
"COM" jack.
2.Set the Function/Range switch to the DC or AC ranges.
3.Remove power from the circuit under test and open the normal circuit path
where the measurement is to be taken. Connect the meter in series with the
circuit.
4.Apply power and read the value from the display.
Resistance Measurements
1.Set the Function/Range switch to the desired resistance range.
2.Reove power from the equipment under test.
3.Connect the red test lead to the "VΩ" jack and the black test lead to the "COM"
jack.
4.Connect the test leads to the points of measurements and read the value from
the display.
Diode Tests
1.Connect the red test lead to the “VΩ” jack and the black test lead to
the ”COM” jack.
2.Set the Function/Range switch to the “ “ position.
3.Turn off power to the circuit under test. External voltage across the
components causes invalid readings.
4.Touch probes to the diode. A forward-voltage drop is about 0.6V (typical for a
silicon diode).
5.Reverse probes. If the diode is good, “MSD blinks”
displayed. If the diode is shorted, “000” or another number is displayed.
6. If the diode is open, “MSD blinks”.
Continuity Measurements
1.Set the Function switch to the position.
2.Turn off power to the circuit under test. External Voltage across the
components causes invalid reading.
3.Connect the test leads to the two points at which continuity is to be tested. The
buzzer will sound if the resistance is less than approximately 40Ω.
Capacitance M easurements
1.Set the Function/Range switch to the desired capacitance range.
2.Connect the red test lead to the “VΩ” jack and the black test lead to the “COM”
jack.
3. Touch the probes to the capacitor. Observe polarity when measuring polarized
capacitors.
4.Read the capacitance directly from the display.
5. Discharge the capacitor before taking capacitance measurements.
Frequency M easurements
1.Set the Function/Range switch to the ”Hz” position.
2. Use this button to select “Hz “ range position.
3.Connect the red test lead to the “VΩ” jack and the black test lead to the
“COM” jack.
4.Connect the test leads to the point of measurement and read the frequency
from the display.
Auto Power Off
1. Auto power off: approx. 30 minutes.
2. After auto power off, move the function switch to OFF position to re-start the
meter.
MAINTENANCE
WARNING
Remove test leads before changing battery or fuse or
performing any servicing.
Battery Replacement
Power is supplied by a 9 volt battery. (NEDA 1604, IEC 6F22). The " " appears
on the LCD display when replacement is needed. To replace the battery, remove
the three screws from the back of the meter and lift off the front case. Remove
the battery from case bottom.
Fuse Replacement
If no current measurements are possible. Check for a blown overload protection
fuse. For access to fuses, remove the three screws from the back of the meter
and lift off the front case. Replace F1 only with the original type 0.5A/500V, fast
acting ceramic fuse, 6.35x32mm Replace F2 only with the original type
10A/600V, fast acting ceramic fuse, 6.35x25.4mm.
Cleaning
Wipe the case with a damp cloth and mild detergent. Do not use abrasives or
solvents. Dirt or moisture in the terminals can affect readings.
Safety: Conforms to IEC61010-1 (EN61010-1), CATII 1000V, CATIII 600V, Class
II, Pollution degree 2 Indoor use.
CATII: Is for measurements performed on circuits directly connected to the
low-voltage installation.
CAT III: Is for measurements performed in the building installation.
EMC: Conforms to EN61326.
The symbols used on this instrument are:
Caution, refer to accompanying documents
Equipment protected throughout by Double insulation (Class II)
Alternating current
Direct current
Ground