OPERATING INSTRUCTIONS
MODEL 2705B
DIGITAL MULTIMETER
2705B
A mA
COM
10A
SAFETY INFORMATION
The following safetyinformationmustbeobservedtoensure maximumpersonal
safetyduring the operation at this meter:
Use themeter only as specified in this manualorthe protectionprovided bythe
metermight be impaired.
Test themeteron a known voltage before usingittodetermine if hazardous
voltage is present.
Do not usethemeter if the meter ortestleads look damaged, or if you suspect
that themeter is not operating properly.
Neverground yourself when takingelectricalmeasurements.Donot touch
exposed metal pipes,outlets,fixtures, etc.,which might be at ground potential.
Keepyour body isolatedfrom groundbyusing dry clothing, rubbershoes, rubber
mats,oranyapprovedinsulatingmaterial.
Turnoff powertothecircuit undertestbefore cutting,unsoldering, or breaking
the circuit. Small amounts of currentcanbedangerous.
Use caution when working above 60V dc or 30V ac rms. Such voltages pose a
shockhazard.
When using the probes,keepyour fingersbehind the fingerguards on the
probes.
Measuring voltage which exceeds the limits of themultimetermaydamage the
meterandexpose the operator to a shock hazard. Always recognize the meter
voltage limits asstated on the frontofthemeter.
V
SPECIFICATIONS
Display: 3¾ digitliquid crystaldisplay (LCD)with a maximum reading of 3999.
Polarity: Automatic, positiveimplied, negative polarityindication.
Overrange: (OL) or (-OL)is displayed.
Zero: Automatic.
Low battery indication: The
belowthe operatinglevel.
Measurement rate: 2 times persecond, nominal.
Autopower off: Approx. 10minutes.
Operating environment: 0℃ to 50℃ at < 70% relative humidity.
Storage temperature: -20℃ to 60℃, 0 to 80% relative humidity.
Accuracy: Stated accuracyat 23℃±5℃, < 75% relative humidity.
Temperature Coefficient: 0.1 x (specified accuracy) per ℃. (℃ to 18℃, 28℃
to 50℃).
Altitude: 6561.7 feet (2000m).
Power: Singlestandard9-volt battery, NEDA1604,JIS 006P,IEC 6F22.
Batterylife: 200 hours typical withcarbon-zinc.
Dimensions: 165mm(H) x78mm (W) x42.5mm (D).
Weight: Approx. 10.0 oz.(285g) includingholster.
Accessories: One set testleads, onespare fuse, 9V battery (installed), and
Operating Instructions.
is displayed when thebattery voltage drops
" "
DC VOLTS
Ranges: 400mV,4V, 40V,400V,1000V
Resolution: 0.1mV
Accuracy: ± (1 .0 %r dg +2 dg ts )
Inputimpedance: 400mV:>100MΩ; 4V:10MΩ; 40V ~ 1000V:9.1MΩ
Overload protection: 1000VDC or 750VAC rms
AC VOLTS (50Hz- 500Hz)
Ranges: 400mV,4V, 40V,400V,750V
Resolution: 0.1mV
Accuracy:
±( 2.0% rdg+ 5 dgts)50 ~100Hzon 400mVrange
±( 2.0% rdg + 5 dgts)
Inputimpedance: 400mV:>100MΩ; 4V:10MΩ; 40V ~750V:9.1MΩ
Overload protection: 1000VDC or 750VAC rms
CURRENT
Ranges: 400uA, 4000uA, 40mA, 400mA,10A
Resolution: 0.1uA
DC accuracy:
±( 2.0% rdg+ 2 dgts)on 400uAto 400mAranges
±( 3.0% rdg+ 3 dgts)on 10A range
AC accuracy: (50Hz ~ 500Hz)
±( 2.5% rdg+ 5 dgts)on 400uAto 400mAranges
±( 3.5% rdg+ 5 dgts)on 10A range
Voltageburden: 0.2V on 400uA, 40mA, 10Aranges
2V on 4000uA, 400mAranges
Inputprotection: 0.5A/500Vfast blow ceramicfuse
10A/600V fast blowceramic fuse
10AInput: 10A for60 seconds maximumfollowed
by a 10 minutecooling period
RESISTANCE
Ranges: 400Ω, 4kΩ, 40kΩ, 400kΩ, 4MΩ,40MΩ
Resolution: 0.1Ω
Accuracy:
±( 1.5% rdg+ 4 dgts)on 400Ωto 400kΩranges
±( 2.5% rdg+4 dgt) on 4MΩrange
±( 5.0% rdg+ 5 dgt)on40MΩrange
Open circuit volts: -0.45Vdc (-1.2Vdcon 400Ωrange)
Overload protection: 500VDC orAC rms
DIODE TEST
Test current: 1.0mA(approximate)
Accuracy: ±(3.0% rdg + 3 dgts)
Resolution: 10mV
Audible indication: <0.25V
Open circuit volts: 3.0Vdc typical
Overload protection: 500VDC orAC rms
CONTINUITY
Audible indication: Less than 25Ω
Response time: 500ms
Overload protection: 500VDC orAC rms
Input Warning Beeper
The meterhas a beeper thatwarns the userwhen the test leadis in thecurrent
jack while the meter is switched to makea voltage measurement.Anothersafety
feature to protect themeter and you.
Data Hold Feature
Press[HOLD] buttonto lock the reading on display, and release it by pressing
the button again.
Manually Selecting Range
The meteralso has a manualrangemode. In manualrange, youselect and lock
the meterin a range. To manually select a range:
Press[RANGE] buttonto hold the selected range.Subsequently pressingthe
[RANGE] button willselect each range in sequencefrom the lowest tohighest
range. Hold the buttonfor 2 seconds to return to the Autorange Mode.
Voltage Measurements
1.Connect the red testlead to ”VΩ”jack and the blacktest lead to the ”COM”
jack.
2.Setthe Function/Range switchto the desiredvoltagetype (AC or DC) and
range. If magnitudeof voltage is not known, set switch to the highest range
and reduce until a satisfactory readingis obtained.
3.Connect the test leadsto the deviceor circuit beingmeasured.
4. For dc, a (-) sign is displayed for negative polarity;positivepolarity is implied.
CurrentMeasurements
1.Connect the red testlead to the (uA, mAor 10A) jack and theblack test leadto
the "COM" jack.
2.Setthe Function/Range switchto the DC orAC ranges.
3.Remove powerfromthe circuit under test and open thenormal circuitpath
wherethe measurement is to be taken.Connect themeter in series withthe
circuit.
4.Apply power and read the valuefrom the display.
Resistance Measurements
1.Setthe Function/Range switchto the desiredresistancerange.
2.Reove power from the equipment under test.
3.Connect the redtest lead tothe"VΩ" jack andthe blacktest lead to the"COM"
jack.
4.Connectthe test leads to the points of measurements andread the value from
the display.
Diode Tests
1.Connect the red testlead to the “VΩ” jack and the blacktest lead to
the ”COM” jack.
2.Setthe Function/Range switchto the “ “ position.
3.Turn off power to the circuitunder test. External voltageacross the
components causesinvalidreadings.
4.Touch probesto thediode.A forward-voltage drop is about0.6V (typicalfor a
silicondiode).
5.Reverse probes.If the diode is good, “OL”is displayed. If thediode is shorted,
“000” or another number is displayed.
6. If the diodeis open,“OL” is displayed in bothdirections.
7.Audible Indication: Less than 0.25V.
Continuity Measurements
1.Setthe Functionswitch to the position.
2.Turn off powerto the circuit undertest. External Voltage across the
components causesinvalidreading.
3.Connect the test leadsto the two points at which continuity is to be tested.The
buzzer will sound if the resistance is lessthan approximately25Ω.
Auto Power Off
1.Auto power off:approx.10 minutes.
2.After autopower off, pressany buttonto restart the meter, and the reading of
measurement willbe maintainedin the display.
Cancellation of Auto Power Off Feature:
Pressand hold the (RANGE) button whilerotatingfunction switchfrom off to
anyposition to turn the meter on.The auto poweroff featureis disabled.
Note“APO” annunciatoris missing from theLCD.
MAINTENANCE
Removetest leads before changingbatteryor fuse or
performing any servicing.
WARNING
Battery Replacement
Poweris suppliedby a 9 voltbattery. (NEDA1604,IEC 6F22).The
on the LCDdisplay whenreplacement is needed.To replace the battery, remove
the threescrews fromthe back of the meter andlift off thefront case. Remove
the battery from case bottom.
" "
appears
Fuse Replacement
If no current measurements are possible. Check fora blown overload protection
fuse.For access to fuses,remove thethree screwsfrom the back of themeter
and liftoff the frontcase. ReplaceF1 only with the original type 0.5A/500V,fast
actingceramic fuse,6.35x32mm Replace F2 onlywith the original type
10A/600V, fast actingceramicfuse, 6.35x25.4mm.
Cleaning
Wipe thecase with a damp clothand mild detergent. Do not use abrasives or
solvents. Dirt or moisture in the terminals can affectreadings.
Safety: Conformsto IEC61010-1 (EN61010-1), CATII 1000V, CATIII 600V, Class
CATII: Is for measurements performed on circuitsdirectlyconnectedto the
CAT III: Is for measurements performed in the building installation.
EMC: Conformsto EN61326.
The symbols used on this instrument are:
II, Pollution degree2 Indoor use.
low-voltageinstallation.
Caution, refer to accompanyingdocuments
Equipment protected throughout by Doubleinsulation(Class II)
Alternating current
Directcurrent
Ground
99 Washington Street
Melrose, MA 02176
Phone 781-665-1400
Toll Free 1-800-517-8431
Visit us at www.TestEquipmentDepot.com
Back to the BK Precision 2705B Info Page
OPERATION
Beforetaking anymeasurements, readthe Safety Information Section. Always
examine the instrument for damage,contamination (excessive dirt,grease, etc.)
and defects. Examinethe test leads for cracked orfrayed insulation. If any
abnormal conditions exist do not attempt to make any measurements.
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
FAX 781.665.0780 - TestEquipmentDepot.com
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