CEM 9915 User manual

10A
A
mA
V
Ω
¡ã¡ã
μ
REL
AC
Hz%
DC
AUTO
Hz%
kM
F
C
OPERATING INSTRUCTION
AUTORANGING DIGITAL MULTIMETE
MODEL 9915

SAFETY INFORMATION
The following safety information must be observed to insure
maximum personal safety during the operation at this meter:
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.

Never apply voltage or current to the meter that exceeds the
specified maximum:
SAFETY SYMBOLS
This symbol adjacent to another symbol, terminal or
operating device indicates that the operator must
refer to an explanation in the Operating Instructions
to avoid personal injury or damage to the meter.
This WARNING symbol indicates a potentially
hazardous situation, which if not avoided, could
result in death or serious injury.
This CAUTION symbol indicates a potentially
hazardous situation, which if not avoided, may
result damage to the product.
This symbol advises the user that the terminal(s) so
marked must not be connected to a circuit point at
which the voltage with respect to earth ground
exceeds (in this case)1000 VAC or VDC.
This symbol adjacent to one or more terminals
identifies them as being associated with ranges that
may, in normal use, be subjected to particularly
WARNING
CAUTION
MAX

36
9
10
8
4
10A
A
mA
V
Ω
¡ã
¡ã
μ
11
12
7
REL
1
2
AC
Hz%
DC
AUTO
Hz%
kM
F
C
5
hazardous voltages. For maximum safety, the meter
and its test leads should not be handled when these
terminals are energized.
CONTROLS AND JACKS
1. Large 4000 count Liquid Crystal Display
with symbolic signs.
2. Range pushbutton.

3. Frequency/ %Duty button.
4. Mode pushbutton.
5. Data Hold pushbutton
6. Relative pushbutton.
7. Backlight pushbutton.
8. Function switch
9. 10A (positive) input jack for
10. uA/mA input jack
11. Positive input jack for DC/AC Voltage, Hz/ %duty
cycle, Ohms, Diode, Continuity, Capacitance, measurements
12. COM (negative) input jack.
SYMBOLS AND ANNUNCIATORS
Continuity
B AT Low Battery
Diode
DATA HOLD Data Hold
AUTO AutoRanging
AC Alternating Current or Voltage
DC Direct Current or Voltage

SPECIFICATIONS
The instrument complies with: EN61010-1.
Insulation: Class2, Double insulation.
Overvoltage category: CATIII 1000V, CATIV600V.
Display: 4000 counts LCD display with function indication.
Polarity: Automatic, (-) negative polarity indication.
Overrange: “OL” mark indication.
Low battery indication: The “BAT” is displayed when the
battery voltage drops below the operating level.
Measurement rate: 2 times per second, nominal.
Auto power off: Meter automatically shuts down after approx. 15
minutes of inactivity.
Operating environment: 0 oC to 50 oC (32
o
F to 122
o
F) at <
70 % relative humidity.
Storage temperature: -20 oC to 60 oC (-4
o
F to 140
o
F) at < 80 %
relative humidity.
For inside use, max height: 2000m
Pollution degree: 2
Power: One 9V battery , NEDA 1604, IEC 6F22.
Dimensions: 182 (H) x 82 (W) x55 (D) mm

Weight: Approx.: 375g.
Accuracy is given at 18 oC to 28 oC (65
o
F to 83
o
F), less than
70 % RH
DC Voltage (Auto-ranging)
Range
Resolution
Accuracy
400.0mV
0.1mV
+0.5% of rdg + 2 dgts
4.000V
1mV
+1.2% of rdg + 2 dgts
40.00V
10mV
400.0V
100mV
1000V
1V
+1.5% of rdg + 2 dgts
Input Impedance: 7.8MΩ.
Maximum Input:1000V dc or1000V ac rms.
AC Voltage (Auto-ranging except 400mV)
Range
Resoluti
on
Accuracy
400.0mV
0.1mV
+1.5%of rdg + 70 dgts
4.000V
1mV
+1.2% of rdg + 3 dgts
40.00V
10mV
+1.5% of rdg + 3 dgts
400.0V
100mV
1000V
1V
+2.0% of rdg + 4 dgts
Input Impedance: 7.8MΩ.
AC Response: 50 Hz to 400 Hz
Maximum Input: 1000V dc or 1000V ac rms.

DC Current (Auto-ranging for uA and mA)
Range
Resolution
Accuracy
400.0uA
0.1uA
+1.0% of rdg + 3 dgts
4000uA
1uA
+1.5% of rdg + 3 dgts
40.00mA
10uA
400.0mA
100uA
10A
10mA
+2.5% of rdg + 5 dgts
Overload Protection: 0.5A / 1000V and 10A / 1000V Fuse.
Maximum Input: 400mA dc or 400mA ac rms on uA / mA ranges,
10A dc or ac rms on 10A range.
AC Current (Auto-ranging for uA and mA)
Range
Resolution
Accuracy
400.0uA
0.1uA
+1.5% of rdg + 5 dgts
4000uA
1uA
+1.8% of rdg + 5 dgts
40.00mA
10uA
400.0mA
100uA
10A
10mA
+3.0% of rdg + 7 dgts
Overload Protection: 0.5A / 1000V and 10A / 1000V Fuse.
AC Response: 50 Hz to 400 Hz
Maximum Input: 400mA dc or 400mA ac rms on uA / mA ranges,
10A dc or ac rms on 10A range.

Resistance (Auto-ranging)
Range
Resolution
Accuracy
400.0Ω
0.1Ω
+1.2% of rdg + 4 dgts
4.000kΩ
1Ω
+1.0% of rdg + 2 dgts
40.00kΩ
10Ω
+1.2% of rdg + 2 dgts
400.0kΩ
100Ω
4.000MΩ
1kΩ
40.00MΩ
10kΩ
+2.0% of rdg + 3 dgts
Input Protection: 600V dc or 600V ac rms.
Capacitance (Auto-ranging)
Range
Resolution
Accuracy
4.000nF
1pF
+5.0% of rdg+20 dgts
40.00nF
10pF
+5.0% of rdg + 7 dgts
400.0nF
0.1nF
+3.0% of rdg + 5 dgts
4.000uF
1nF
40.00uF
10nF
200.0uF
0.1uF
+5.0% of rdg + 5 dgts
Input Protection: 600V dc or 600V ac rms.
Frequency (Auto-ranging)
Range
Resolution
Accuracy
9.999Hz
0.001Hz
+1.5% of rdg + 5 dgts
99.99Hz
0.01Hz
999.9Hz
0.1Hz
+1.2% of rdg + 3 dgts
9.999kHz
1Hz
99.99kHz
10Hz
999.9kHz
100Hz
9.999MHz
1kHz
+1.5% of rdg + 4 dgts

Sensitivity: <0.5V RMS while ≤1MHz ;
Sensitivity: >3V RMS while >1MHz ;
Overload protection: 600V dc or ac rms.
Duty Cycle
Range
Resolution
Accuracy
0.1%~99.9%
0.1%
+1.2% of rdg + 2 dgts
Pulse width: >100us, <100ms;
Frequency width: 5Hz – 150kHz
Sensitivity: <0.5V RMS
Overload protection: 600V dc or ac rms.
Diode Test
Test current
Resolution
Accuracy
0.3mA
typical
1 mV
+10% of rdg + 5 dgts
Open circuit voltage: 1.5V dc typical
Overload protection: 600V dc or ac rms.
Audible continuity
Audible threshold: Less than150Ω; Test current: <0.3mA
Overload protection: 600V dc or ac rms.

OPERATION
WARNING: Risk of electrocution. High-voltage circuits,
both AC and DC, are very dangerous and should be measured
with great care.
1. ALWAYS turn the function switch to the OFF position
when the meter is not in use. This meter has Auto OFF that
automatically shuts the meter OFF if 15 minutes elapse between
uses.
2. If “OL” appears in the display during a measurement, the
value exceeds the range you have selected. Change to a higher
range.
NOTE: On some low AC and DC voltage ranges, with the test leads not
connected to a device, the display may show a random, changing reading.
This is normal and is caused by the high-input sensitivity. The reading will
stabilize and give a proper measurement when connected to a circuit.
MODE BUTTON
To select Diode/Continuity or DC/AC current
RANGE BUTTON
When the meter is first turned on, it automatically goes into AutoRanging.
This automatically selects the best range for the measurements being made
and is generally the best mode for most measurements. For measurement

situations requiring that a range be manually selected, perform the
following:
1. Press the RANGE button. The “AUTO” display indicator will turn
off.
2. Press the RANGE button to step through the available ranges until
you select the range you want.
3. Press and hold the RANGE button for 2 seconds to
exit the ManualRanging mode and return to AutoRanging.
(If backlight is turn on, please press BACKLIGHT button it will turn
off)
DATA HOLD BUTTON
The Data Hold function allows the meter to "freeze" a measurement for
later reference.
1. Press the DATA HOLD button to “freeze” the reading on the
indicator. The indicator “HOLD” will be appear in the display.
2. Press the DATA HOLD button to return to normal operation.
RELATIVE BUTTON
The relative measurement feature allows you to make measurements
relative to a stored reference value. A reference voltage, current, etc. can
be stored and measurements made in comparison to that value. The
displayed value is the difference between the reference value and the
measured value.

1. Perform any measurement as described in the operating instructions.
2. Press the RELATIVE button to store the reading in the display and the
"REL" indicator will appear on the display.
3. The display will now indicate the difference between the stored value
and the measured value.
4. Press the RELATIVE button to return to normal operation.
BACKLIGHT BUTTON
1. Press the BACKLIGHT button 2 seconds the display light ON
2. Press BACKLIGHT button again to exit the light mode.
Hz/%duty BUTTON
Press Hz/Duty Button to choose Frequency or Duty Cycle in the range of
Frequency; Press Hz/%Duty Button to measure Frequency or Duty Cycle
while measures voltage or Current, the Voltage/Current requirement and
range of Frequency see the following form, press Hz/%Duty Button to
return to measurement of Voltage or Current.
Range
( DC/AC )
Sensitivity
Frequency
width
4V
≥
1.5V rms
5Hz~10kHz
40V, 400V
≥
10V rms
5Hz~20kHz
≥
20V rms
5Hz~200kHz
1000V/1000V
≥
420V rms
50Hz~1kHz
400mA
≥
45mA rms
5Hz~5kHz
10A
≥
4A rms
5Hz~1kHz

Note: The above data only for reference.
DC VOLTAGE MEASUREMENTS
CAUTION: Do not measure DC voltages if a motor on the circuit is
being switched ON or OFF. Large voltage surges may occur that can
damage the meter.
1. Set the function switch to the V DC position (“mV” will appear in the
display).
2. Insert the black test lead banana plug into the negative (COM) jack
and the red test lead banana plug into the positive (V) jack.
3. Touch the test probe tips to the circuit under test. Be sure to observe
the correct polarity (red lead to positive, black lead to negative).
4. Read the voltage in the display. The display will indicate the
proper decimal point and value. If the polarity is reversed, the
display will show (-) minus before the value.
AC VOLTAGE MEASUREMENTS
WARNING: Risk of Electrocution. The probe tips may not be long
enough to contact the live parts inside some 240V outlets for
appliances because the contacts are recessed deep in the outlets. As a
result, the reading may show 0 volts when the outlet actually has
voltage on it. Make sure the probe tips are touching the metal contacts
inside the outlet before assuming that no voltage is present.

CAUTION: Do not measure AC voltages if a motor on the circuit is
being switched ON or OFF. Large voltage surges may occur that can
damage the meter.
1. Set the function switch to the V AC position.
2. Insert the black test lead banana plug into the negative (COM)
jack and the red test lead banana plug into the positive (V)
jack.
3. Touch the test probe tips to the circuit under test.
4. Read the voltage in the display. The display will indicate the
proper decimal point, value and symbol (AC, V, etc.).
DC CURRENT MEASUREMENTS
CAUTION: Do not make current measurements on the 10A scale
for longer than 30 seconds. Exceeding 30 seconds may cause damage
to the meter and/or the test leads.
1. Insert the black test lead banana plug into the negative (COM) jack.
2. For current measurements up to 4000µA DC, set the function switch to
the µA position and insert the red test lead banana plug into the (µA)
jack.
3. For current measurements up to 400mA DC, set the function switch to
the mA range and insert the red test lead banana plug into the (mA)
jack.

4. For current measurements up to 10A DC, set the function switch to the
A position and insert the red test lead banana plug into the 10A jack.
5. Press the AC/DC button until “DC” appears in the display.
6. Remove power from the circuit under test, then open up the circuit at
the point where you wish to measure current.
7. Touch the black test probe tip to the negative side of the circuit.
Touch the red test probe tip to the positive side of the circuit.
8. Apply power to the circuit.
9. Read the current in the display. The display will indicate the proper
decimal point, value and symbol.
AC CURRENT MEASUREMENTS
WARNING: To avoid electric shock, do not measure AC current on
any circuit whose voltage exceeds 250V AC.
CAUTION: Do not make current measurements on the 10A scale
for longer than 30 seconds. Exceeding 30 seconds may cause damage
to the meter and/or the test leads.
1. Insert the black test lead banana plug into the negative (COM) jack.
2. For current measurements up to 4000µA AC, set the function switch to
the µA position and insert the red test lead banana plug into the (µA)
jack.
3. For current measurements up to 400mA AC, set the function switch to

the mA range and insert the red test lead banana plug into the (mA)
jack.
4. For current measurements up to 10A AC, set the function switch to the
A position and insert the red test lead banana plug into the 10A jack.
5. Press the AC/DC button until “AC” appears in the display.
6. Remove power from the circuit under test, then open up the circuit at
the point where you wish to measure current.
7. Touch the black test probe tip to the negative side of the circuit. And
touch the red test probe tip to the positive side of the circuit.
8. Apply power to the circuit.Read the current in the display. The
display will indicate the proper decimal point, value and
symbol.

RESISTANCE MEASUREMENTS
WARNING: To avoid electric shock, disconnect power to the unit
under test and discharge all capacitors before taking any resistance
measurements. Remove the batteries and unplug the line cords.
1. Set the function switch to the Ω position.
2. Insert the black test lead banana plug into the negative (COM) jack
and the red test lead banana plug into the positive Ωjack.
3. Touch the test probe tips across the circuit or part under test. It is best
to disconnect one side of the part under test so the rest of the circuit
will not interfere with the resistance reading.
4. Read the resistance in the display. The display will indicate the proper
decimal point, value and symbol.
CONTINUITY CHECK
WARNING: To avoid electric shock, never measure continuity on
circuits or wires that have voltage on them.
1. Set the function switch to the position.
2. Insert the black lead banana plug into the negative (-) jack (COM)
and the red test lead banana plug into the positive (+) jack (Ω).
3. Press the button until the symbol appears in the display.
4. Touch the test probe tips to the circuit or wire you wish to check.
5. If the resistance is less than approximately 150Ω, the audible signal

will sound. The display will also show the actual resistance.
DIODE TEST
WARNING: To avoid electric shock, do not test any diode that has
voltage on it.
1. Set the function switch to position.
2. Press the button until the symbol appears in the display.
3. Insert the black test lead banana plug into the negative (-) jack (COM)
and the red test lead banana plug into the positive (+) jack (Ω).
4. Touch the test probe tips to the diode or semiconductor junction you
wish to test. Note the meter reading
5. Reverse the probe polarity by switching probe position. Note this
reading.
6. The diode or junction can be evaluated as follows:
A. If one reading shows a value and the other reading shows OL, the
diode is good.
B. If both readings show OL, the device is open.
C. If both readings are very small or 0, the device is shorted.
NOTE: The value indicated in the display during the diode check is the
forward voltage.

FREQUENCY MEASUREMENT
1. Set the function switch to the FREQ position.
2. Insert the black test lead banana plug into the negative (-) jack (COM)
and the red test lead banana plug into the positive (+) jack (F).
3. Touch the test probe tips to the circuit under test.
4. Read the frequency in the display. The digital reading will indicate the
proper decimal point, symbols (Hz, kHz) and value.
CAPACITANCE MEASUREMENTS
WARNING: To avoid electric shock, disconnect power to the unit
under test and discharge all capacitors before taking any capacitance
measurements. Remove the batteries and unplug the line cords.
1. Set the function switch to the CAP position. (“nF” and a small value
will appear in the display).
2. Insert the black test lead banana plug into the negative (-) jack (COM)
and the red test lead banana plug into the positive (+) jack (CAP).
3. Touch the test leads to the capacitor to be tested. The display will
indicate the proper decimal point, value and symbol.