OPERATING INSTRUCTIONS
MODEL 2705B
DIGITAL MULTIMETER
10A
COM
A mA
V
2705B
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:
3¾ digit liquid crystal display (LCD) with a maximum reading of 3999.
Polarity:
Automatic, positive implied, negative polarity indication.
Overrange:
(OL) or (-OL) is displayed.
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. 10 minutes.
Operating environment:
0
℃
to 50
℃
at < 70% relative humidity.
Storage temperature:
-20
℃
to 60
℃
, 0 to 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:
200 hours typical with carbon-zinc.
Dimensions:
165mm (H) x78mm (W) x42.5mm (D).
Weight:
Approx. 10.0 oz.(285g) including holster.
Accessories:
One set test leads, one spare fuse, 9V battery (installed), and
DC VOLTS
Ranges:
400mV, 4V, 40V, 400V, 1000V
Resolution:
0.1mV
Accuracy:
± ( 1 . 0 % r d g + 2 d g t s )
Input impedance:
400mV: >100M
Ω
; 4V:10M
Ω
; 40V ~ 1000V:9.1M
Ω
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 ~100Hz on 400mV range
± ( 2.0% rdg + 5 dgts)
Input impedance:
400mV: >100M
Ω
; 4V:10M
Ω
; 40V ~750V:9.1M
Ω
Overload protection:
1000VDC or 750VAC rms
CURRENT
Ranges:
400uA, 4000uA, 40mA, 400mA, 10A
Resolution:
0.1uA
DC accuracy:
± ( 2.0% rdg + 2 dgts) on 400uA to 400mA ranges
± ( 3.0% rdg + 3 dgts) on 10A range
AC accuracy:
(50Hz ~ 500Hz)
± ( 2.5% rdg + 5 dgts) on 400uA to 400mA ranges
± ( 3.5% rdg + 5 dgts) on 10A range
Voltage burden:
0.2V on 400uA, 40mA, 10A ranges
2V on 4000uA, 400mA ranges
Input protection:
0.5A/500V fast blow ceramic fuse
10A/600V fast blow ceramic fuse
10A Input
: 10A for 60 seconds maximum followed by a 10 minute cooling period
RESISTANCE
Ranges:
400
Ω
, 4k
Ω
, 40k
Ω
, 400k
Ω
, 4M
Ω
, 40M
Ω
Resolution:
0.1
Ω
Accuracy:
± ( 1.5% rdg + 4 dgts) on 400
Ω
to 400k
Ω
ranges
± ( 2.5% rdg +4 dgt) on 4M
Ω
range
± ( 5.0% rdg + 5 dgt) on 40M
Ω
range
Open circuit volts:
-0.45Vdc (-1.2Vdc on 400
Ω
range)
Overload protection:
500VDC or AC 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 or AC rms
CONTINUITY
Audible indication:
Less than 25
Ω
Response time:
500ms
Overload protection:
500VDC or AC rms
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.
the user when the test lead is in the current
make a voltage measurement. Another safety
u.
ading on display, and release it by pressing
e mode. In manual range, you select and lock
lect a range:
selected range. Subsequently pressing the
nge in sequence from the lowest to highest
s to return to the Autorange Mode.
jack and the black test lead to the ”COM”
the desired voltage type (AC or DC) and
not known, set switch to the highest range
ading is obtained.
ce or circuit being measured.
negative polarity; positive polarity is implied.
A, mA or 10A) jack and the black test lead to
the DC or AC ranges.
der test and open the normal circuit path
taken. Connect the meter in series with the
om the display.
the desired resistance range.
t under test.
V
Ω
" jack and the black test lead to the "COM"
ts of measurements and read the value from
V
Ω
” jack and the black test lead to
the “
“ position.
test. External voltage across the
gs.
ard-voltage drop is about 0.6V (typical for a
od, “OL” is displayed. If the diode is shorted,
yed.
yed in both directions.
V.
position.
r test. External Voltage across the
g.
points at which continuity is to be tested. The
is less than approximately 25
Ω
.
es.
tton to restart the meter, and the reading of
in the display.
er Off Feature:
while rotating function switch from off to
e auto power off feature is disabled.
from the LCD
.
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
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