OPERATING INSTRUCTIONS
MODEL 2709B
DIGITAL MULTIMETER
10A
COM
A mA
V
Hz
2709B
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 6600.
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. 30 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:
150 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
Operating Instructions.
DC VOLTS
Ranges:
660mV, 6.6V, 66V, 660V, 1000V
Resolution:
0.1mV
Accuracy:
± ( 0 . 5 % r d g + 2 d g t s )
Input impedance:
660mV: >100M
Ω
; 6.6V: 10M
Ω
; 66V ~ 1000V: 9.1M
Ω
Overload protection:
1000VDC or 750VAC rms
AC VOLTS
(TRUE RMS) (50Hz - 500Hz)
Ranges:
660mV, 6.6V, 66V, 660V, 750V
Resolution:
0.1mV
Accuracy:
± ( 1.5% rdg + 8 dgts) 50 ~60Hz on 660mV range
± ( 1.5% rdg + 8 dgts) on 6.6V to 660V ranges
± ( 2.0% rdg + 8 dgts) on 750V range
Crest factor:
≤
3
Input impedance:
660mV: >100M
Ω
; 6.6V: 10M
Ω
; 66V ~ 750V: 9.1M
Ω
Overload protection:
1000VDC or 750VAC rms
CURRENT
Ranges:
660uA, 6600uA, 66mA, 400mA, 10A
Resolution:
0.1uA
DC accuracy:
± ( 1.5% rdg + 2 dgts) on 660uA to 400mA ranges
± ( 3.0% rdg + 3 dgts) on 10A range
AC accuracy:
(TRUE RMS)
(50Hz ~ 500Hz)
± ( 2.0% rdg + 10 dgts) on 660uA to 400mA ranges
± ( 3.5% rdg + 10 dgts) on 10A range
Crest factor:
≤
3
Voltage burden:
0.4V on 660uA, 66mA, 10A ranges
2V on 6600uA, 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:
660
Ω
, 6.6k
Ω
, 66k
Ω
, 660k
Ω
, 6.6M
Ω
, 66M
Ω
Resolution:
0.1
Ω
Accuracy:
± ( 1.2% rdg + 5dgts) on 660
Ω
to 660k
Ω
ranges
± ( 2.0% rdg + 5 dgt) on 6.6M
Ω
range
± ( 3.5% rdg + 5 dgt) on 66M
Ω
range
Open circuit volts:
-0.45Vdc (-1.2Vdc on 660
Ω
range)
Overload protection:
500VDC or AC rms
CAPACITANCE
Ranges:
6.6nF, 66nF, 660nF, 6.6uF, 66uF, 660uF, 6.6mF, 66mF
Resolution:
1PF
Accuracy:
± ( 3.0% rdg + 30 dgts) on 6.6nF range
± ( 3.0% rdg + 5 dgts) on 66nF to 660uF ranges
± ( 5.0% rdg + 20 dgts) on 6.6mF, 66mF ranges
Overload protection:
500VDC or AC rms
FREQUENCY
Ranges:
660Hz, 6.6k, 66k, 660k, 6.6M, 66MHz
Resolution:
0.1Hz
Accuracy:
± ( 0.1% rdg + 3 dgts)
Sensitivity:
10Hz ~ 6.6MHz: >2.5V rms, 6.6MHz
~ 66MHz: >2.5V rms <5V rms
Minimum pulse width:
> 25ns
Duty cycle limits:
> 30% and < 70%
Overload protection:
500VDC or AC rms
DIODE TEST
Test current:
1.2mA (approximate)
Accuracy:
±(3.0% rdg + 3 dgts)
Resolution:
1mV
Audible indication:
<0.03V
Open circuit volts:
3.5Vdc typical
Overload protection:
500VDC or AC rms
CONTINUITY
Audible indication:
Less than 30
Ω
Response time:
100ms
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.
Input Warning Beeper
The meter has a beeper that warns the user when the test lead is in the current
jack while the meter is switched to make a voltage measurement. Another safety
feature to protect the meter and you.
MAX / MIN
The "MAX" displays the maximum value of measurements. The "MIN" displays
the minimum value of measurements. The "MAX/MIN" appears and flashes in
the LCD to display the value that is being measured now. After finishing the
measurement, press MAX/MIN button for more than
2 seconds to exit.
Relative Δ
Press (Δ) button to enter the Relative mode. The (Δ) annunciator is displayed,
and residual value on the display is subtracted and stored as a reference value.
In the Relative mode, the value shown on the display is always the difference
between the stored reference value and the present reading. Press (Δ) button
again to exit the relative mode.
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 ”V
Ω
” 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 (uA, 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 "V
Ω
" 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 “ V
Ω
” jack and the black test lead to
the ”C O M ” 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, “OL” is displayed. If the diode is shorted,
“000” or another number is displayed.
6. If the diode is open, “OL” is displayed in both directions.
7. Audible Indication: Less than 0. 03V.
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 30
Ω
.
Capacitance Measurements
1. Set the Function/Range switch to the desired
capacitance range.
2.Connect the red test lead to the “V
Ω
” 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.
6.When the capacitor to be tested is connected, if "dISC" symbol indicates on
LCD, it means there is voltage existing in the tested capacitor and need to be
discharged before testing.
7.For maximum accuracy, step to the desired range in manual ranging, then
press the Relative Δ button to zero out test lead capacitance before the
measurement.
Frequency Measurements
1. Set the Function/Range switch to the “Hz” position.
2. Connect the red test lead to the ”V
Ω
” jack and the black
test lead to
the ”COM” jack.
3. 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, press any button to restart the meter, and the reading of
measurement will be maintained in the display.
Cancellation of Auto Power Off Feature:
Press and hold the (RANGE) button while rotating function switch from off to
any position to turn the meter on. The auto power off feature is disabled.
Not e “APO” annunciator is missing 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
