Table of Contents Title Page Overview Inspection Safety Information

Model 72-8150: OPERATING MANUAL
Table of Contents
Title
Page
Overview
Inspection
Safety Information
Rules For Safe Operation
International Electrical Symbols
The Meter Structure
Functional Buttons
Display Symbols
Measurement Operation
A. Measuring Resistance
B. Capacitance Measurement
C. Diode and Continuity Test
D. Transistor hFE Measurement
General Specifications
Accuracy Specifications
A. Resistance Test
B. Capacitance Test
C. Continuity & Diodes
D. Transistor
Maintenance
A. General Service
B. Replacing the Battery
C. Replacing the Fuse
1
3
4
5
6
8
9
9
10
11
11
13
15
17
18
19
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20
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Model 72-8150: OPERATING MANUAL
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Model 72-8150: OPERATING MANUAL
Overview
This Operating Manual covers information on safety and
cautions. Please read the relevant information carefully
and observe all the Warnings and Notes strictly.
Warning
To avoid electric shock or personal injury, read the
“Safety Information” and “Rules for Safety Operation”
carefully before using the Meter.
Digital Capacitance Meter Model 72-8150 (hereafter
referred to as “the Meter”) is a 3 1/2 digits with steady
operations, fashionable design and highly reliable handheld measuring instrument. It will measure resistance,
transistor hFE and test diodes. It will also test continuity
with an audible buzzer.
The Meter has a broad capacitance measurement range
and precise accuracy. It can be used in measuring the
circuit designed capacitance of cable, switch and PCB
layout.
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Model 72-8150: OPERATING MANUAL
Inspection
Open the package case and take out the Meter. Check
the following items carefully to see if any items are missing
or damaged.
Item
1
Description
English Operating Manual
Qty
1 piece
2
Test Clip
1 pair
3
9V Battery (NEDA1604, 6F22 or 006P) 1 piece
(installed)
In the event you find any items missing or damaged, please
contact your dealer immediately.
4
Model 72-8150: OPERATING MANUAL
Safety Information
This Meter complies with the standards EMC EN61326.
Use the Meter only as specified in this operating manual,
otherwise the protection provided by the Meter may be
impaired.
In this manual, a Warning identifies conditions and actions
that pose hazards to the user, and may damage the Meter
or the equipment under test.
A Note identifies the information that user should pay
attention on.
International electrical symbols used on the Meter and in
this Operating Manual are explained on page 8.
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Model 72-8150: OPERATING MANUAL
Rules For Safe Operation
Warning
To avoid possible electric shock or personal injury,
and to avoid possible damage to the Meter or to the
equipment under test, adhere to the following rules:
l Before using the Meter inspect the case. Do not use
the Meter if it is damaged or the case (or part of the
case) is removed. Look for cracks or missing plastic.
Pay attention to the insulation around the connectors.
l Inspect the test clips for damaged insulation or
exposed metal. Check the test clips for continuity.
Replace damaged test clips with identical model
number or electrical specifications before using the
Meter.
l Do not apply voltage to the Meter.
l The rotary switch should be placed in the correct
position and no change of range made during
measurement, to prevent damage to the Meter.
l Use the proper terminals, function, and range for
your measurements.
l Do not use or store the Meter in an environment of
high temperature, humidity, explosive, inflammable
and strong magnetic field. The performance of the
Meter may deteriorate after dampened.
l Disconnect circuit power and discharge all highvoltage capacitors before testing resistance,
continuity, capacitance or diodes.
l Replace the battery as soon as the battery indicator
appears. With a low battery, the Meter might
produce false readings that can lead to electric shock
and personal injury.
l Remove test clips from the Meter and turn the Meter
power off before opening the Meter case.
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Model 72-8150: OPERATING MANUAL
l When servicing the Meter, use only the same model
number or identical electrical specifications
replacement parts.
l The internal circuit of the Meter shall not be altered
at will to avoid damage of the Meter and any accident.
l Soft cloth and mild detergent should be used to
clean the surface of the Meter when servicing. No
abrasive and solvent should be used to prevent the
surface of the Meter from corrosion, damage and
accident.
l The Meter is suitable for indoor use.
Turn the Meter power off when it is not in use and
take out the battery when not using for a long time.
l Periodically check the battery as it may leak after
some time. If leakage is apparent, the battery should
be immediately replaced to prevent damage to the
Meter.
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Model 72-8150: OPERATING MANUAL
International Electrical Symbols
Ground
Double Insulated
Low Battery.
Continuity Test.
Diode.
Capacitance Test
Fuse.
Warning. Refer to the Operating Manual.
Conforms to Standards of European Union.
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Model 72-8150: OPERATING MANUAL
The Meter Structure (see figure 1)
1
2
8
7
3
6
5
4
(figure 1)
1. LCD Display
2. Capacitance Zero Adjustment Switch
3. Transistor Jack
4. Resistance, Diode and Continuity Buzzer Input Terminal
5. Capacitance Input Terminal
6. Small Value Capacitance Jack
7. Rotary Switch .
8. Power Button
Functional Buttons
Below table indicated for information about the functional
button operations.
Button
Power
Description
Press the Power down to turn the Meter on. Press
the Power again to turn the Meter power off.
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Model 72-8150: OPERATING MANUAL
Display Symbols (see figure 2)
3
1
mF
µF
nF
pF
mH
ΩH
kΩMΩ
2
5
4
6
8
7
(figure 2)
No. Symbol Meaning
1
Data hold is active.
2
The battery is low.
Warning: To avoid false readings, which
could lead to possible electric shock or
personal injury, replace the battery as soon
as the battery indicator appears.
3
β
The continuity buzzer is on.
5
6
Transistor Test
Diode test
4
pF, nF, Farad. The unit of capacitance
F, mF pF: Picofarad. 1x10-12 or 0.000000000001
farads.
nF: Nanofarad. 1x10-9 or 0.000000001 farads.
µF: Microfarad.1x10-6 or 0.000001 farads.
mF: Millifarad. 1x10-3 or 0.001 farads.
7
: Ohm. The unit of resistance
,k ,
M
k
: kilohm. 1x10 3 or 1000 ohms
M : Megaohm. 1x106 or 1,000,000 ohms
8
H, mH H: Henry. The unit of Inductance.
mH: Millihenry. 1x10 -3 or 0.001 henry.
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Model 72-8150: OPERATING MANUAL
Measurement Operation
is not on,
l Make sure the Low Battery Display
otherwise false readings may be provided.
symbol, before carrying
l Pay extra attention to the
measurement, which is located besides the input
terminals of the Meter.
A. Measuring Resistance (see figure 3)
(figure 3)
Warning
To avoid damage to the Meter or to the devices under
test, disconnect circuit power and discharge all the
high-voltage capacitors before measuring resistance.
The resistance ranges are 20 , 200 , 2k , 20k , 200k ,
2M , 20M , 200M and 2000M .
To measure resistance, please connect the Meter as
follows:
1. Insert the red test clip into the
terminal and
the black test clip into COM terminal.
2. Set the rotary switch to range.
3. Connect the test clips across with the object being
measured.
The measured value shows on the display.
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Model 72-8150: OPERATING MANUAL
Note
l When measuring at 20Ω and 200Ω range, the test clips
can add 0.1 to 0.3Ω error to resistance. To obtain precise
readings in low-resistance measurements, short circuit
the input terminals beforehand and record the reading
obtained (called this reading as X). (X) is the additional
resistance from the test clips.
Then use the equation:
measured resistance value (Y) – (X) = precision readings
of resistance.
The Meter displays “1” when there is no input, for
example, open circuit situation.
l For high resistance measurement (>1MΩ), it normally
requires several seconds to obtain a stable reading.
l When resistance measurement has been completed,
disconnect the connection between the testing clips and
l the circuit under test and remove the test clips from the
input terminals of the Meter.
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Model 72-8150: OPERATING MANUAL
B. Capacitance Measurement (see figure 4)
(figure 4)
Warning
To avoid damage to the Meter or to the equipment
under test, disconnect circuit power and discharge
all high-voltage capacitors before measuring
capacitance.
The Meter’s capacitance ranges are:200pF, 2nF, 20nF,
200nF, 2µF, 20µF, 200µF, 2mF and 20mF.
To measure capacitance, connect the Meter as follows:
1. Set the rotary switch to F measurement mode. If the
value of capacitor to be measured is unknown, use the
minimum measurement position 200pF and increase
the range step by step until a satisfactory reading is
obtained and the overload icon "1" is not showing.
2. Insert the red test clip into the CAP + terminal and black
test clip into the CAP – terminal. For small value
capacitor measurement, insert the capacitor into the
Small Value Capacitance Jack.
3. When testing polarized capacitors, use the red test clip
on the capacitor’s positive lead, and the black test clip
on the capacitor’s negative lead. With non-polarized
capacitors, either direction is acceptable.
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Model 72-8150: OPERATING MANUAL
4. When measuring small value capacitor, that is 200pF,
2nF and 20nF, first open circuit the test clips or the
Small Value Capacitance Jack, then turn the
Capacitance Zero Adjustment Switch to adjust zero.
5. The measured value shows on the display.
Note
l Do not short the test clips to avoid the consumption of
battery.
l To minimize the effect of capacitance stored in the test
clips, the test clips should be as short as possible and
use the Small Value Capacitance Jack when measuring
small value of capacitance.
l When capacitance measurement has been completed,
disconnect the connection between the test clips and
the circuit under test and remove the test clips from the
input terminals of the Meter.
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Model 72-8150: OPERATING MANUAL
C. Diode and Continuity Test (see figure 5)
red
(figure 5)
Warning
To avoid damage to the Meter or to the devices under
test, disconnect circuit power and discharge all the
high-voltage capacitors before measuring diodes and
continuity.
Testing Diodes
Use the diode test to check diodes, transistors, and other
semiconductor devices. The diode test sends a current
through the semiconductor junction, and then measures
the voltage drop across the junction. A good silicon junction
drops between 0.5V and 0.8V.
To test a diode out of a circuit, connect the Meter as follows:
terminal and
1. Insert the red test clip into the
the black test clip into the COM terminal.
.
2. Set the rotary switch to
3. For forward voltage drop readings on any semiconductor
component, place the red test clip on the component’s
anode and place the black test clip on the component’s
cathode.
The display shows the diode forward voltage drop’s
nearest value.
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Model 72-8150: OPERATING MANUAL
Note
 In a circuit, a good diode should still produce a forward
voltage drop reading of 0.5V to 0.8V; however, the
reverse voltage drop reading can vary depending on the
resistance of other pathways between the probe tips.
 Connect the test clips to the proper terminals as said
above to avoid error display. The LCD will display “1”
indicating open-circuit for wrong connection. The unit of
diode is Volt (V), displaying the positive-connection
voltage-drop value.
 When diode measurement has been completed,
disconnect the connection between the test clips and
the circuit under test and remove them from the input
terminals of the Meter.
Testing for Continuity
To test for continuity, connect the Meter as below:
1. Insert the red test clip into the
terminal and
the black test clip into the COM terminal.
2. Set the rotary switch to
.
3. Connect the test clips across with the object being
measured.
4. Buzzer beeps if it is less than or equal to 10Ω and buzzer
will not beep if it is more than 100Ω.
5. The Meter displays the value of the test resistance.
Note
 The LCD displays “1” indicating the circuit being tested
is open.
 When continuity test has been completed, disconnect
the connection between the test clips and the circuit
under test and remove them from the input terminals of
the Meter.
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Model 72-8150: OPERATING MANUAL
D. Transistor hFE Measurement (see figure 6)
NPN
PNP
hFE
(figure 6)
To measure transistor, set up the Meter as follows:
1. Check that the transistor is PNP or NPN type.
2. Insert the transistor to be measured to the corresponding
Transistor Jack.
3. The Meter displays the tested transistor’s nearest value.
Note
l When transistor measurement has been completed,
disconnect the connection between the test clips and
the circuit under test and remove them from the input
terminals of the Meter.
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Model 72-8150: OPERATING MANUAL
General Specifications
l Fused Protection for capacitance Input Terminal: 0.315A,
250V, fast type fuse, 5x20 mm.
l Maximum Display: Display: 1999.
l Measurement Speed: Updates 2-3 times /second.
l Polarity: Auto. (Display “-“ when negative)
l Overload: Display “1”
l Range: Manual Ranging
l Capacitance range zero adjustment:
The range around 20pF
l Temperature:
o
o
o
o
Operating: 0 C~40 C (32 F ~104 F).
o
o
o
o
Storage: -10 C~50 C (14 F ~122 F).
l Relative Humidity:
o
o
75% @ 0 C - 30 C;
o
o
50% @ 31 C - 40 C.
l Altitude:
Operating: 2000 m.
Storage: 10000 m.
l Battery Type:
One piece of 9V NEDA1604 or 6F22 or 006P.
l Low Battery: Display
l Dimensions: 6.77" (H) x 3.27" (W) x 1.50" (D).
l Weight: Approximate 310g (battery included).
l Safety/Compliances: EMC EN61326.
l Certification: , UL & CUL pending.
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Model 72-8150: OPERATING MANUAL
Accuracy Specifications
Accuracy: (a% reading + b digits), guarantee for 1 year.
o
o
Operating temperature: 23 C 5 C.
Relative humidity: <75%.
o
Temperature coefficient: 0.1 x (specified accuracy) / 1 C.
A. Resistance Test
Range Resolution
Accuracy
20Ω
0.01Ω
(1%+5)
200Ω
0.1Ω
(0.8%+3)
2kΩ
0.001kΩ
20kΩ
0.01kΩ
200kΩ
0.1kΩ
Overload
Protection
(0.8%+1)
250V rms
2MΩ
0.001MΩ
20MΩ
0.01MΩ
(1%+2)
200MΩ
0.1MΩ
[5%(rdg-10)+10]
2000MΩ
1MΩ
Reference only
Remarks:
l When measuring 20Ω and 200Ω range, the test clips
can add 0.1 to 0.3Ω error to resistance. To obtain precise
readings in low-resistance measurements, short circuit
the input terminals beforehand and record the reading
obtained (called this reading as X). (X) is the additional
resistance from the test lead.
Then use the equation:
measured resistance value (Y) – (X) = precision readings
of resistance
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Model 72-8150: OPERATING MANUAL
B. Capacitance Test
Range
Resolution
200.0pF
0.1pF
2.000nF
0.001nF
20.00nF
0.01nF
200.0nF
0.1nF
2.000µF
0.001µF
20.00µF
0.01µF
200.0µF
0.1µF
2.000mF
0.001mF
20.00mF
0.01mF
Accuracy
Testing
Frequency
800Hz
(0.5%+10)
80Hz
(2%+2)
8Hz
Remarks:
 Overload Protection
0.315A, 250V, fast type fuse, 5x20 mm
 If the Meter can not adjust to zero, you could use the
tested values minus the open circuit value to get the
correct measurement value.
 Measure of Capacitance: 1F=103mF = 106µF = 109nF
= 1012pF
C. Continuity & Diodes
Function
Diode
Continuity
Range
Resolution
1mV
1
Overload
Protection
250V rms
Remarks:
 Diode:
Open Circuit Voltage around 2.8V.
 Continuity
Buzzer beeps if it is less than or equal to 10Ω
and buzzer will not beep if it is more than 100Ω.
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Model 72-8150: OPERATING MANUAL
D. Transistor
Range Resolution
hFE
1β
Testing
Overload
Condition
Protection
Vce
2.8V
I bo
10µA
250V rms
Remarks:
l The display value is the tested transistor’s nearest value
(0~1000β).
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Model 72-8150: OPERATING MANUAL
Maintenance
This section provides basic maintenance information
including battery and fuse replacement instruction.
Warning
Do not attempt to repair or service your Meter unless
you are qualified to do so and have the relevant
calibration, performance test, and service information.
To avoid electrical shock or damage to the Meter, do
not allow water inside the case.
A. General Service
l Periodically wipe the case with a damp cloth and mild
detergent. Do not use abrasives or solvents.
l To clean the terminals with cotton bar with detergent, as
dirt or moisture in the terminals can affect readings.
l Turn the Meter power off when it is not in use and take
out the battery when not using for a long time.
l Do not store the Meter in a place of humidity, high
temperature and strong magnetic field.
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Model 72-8150: OPERATING MANUAL
B. Replacing the Battery (see figure 7)
(figure 7)
Warning
To avoid false readings, which could lead to possible
electric shock or personal injury, replace the battery
as soon as the battery indicator “
” appears.
To replace the battery:
1. Turn the Meter power off and remove all connections
from the terminals.
2. Remove the screw from the battery compartment, and
separate the battery compartment from the case bottom.
3. Remove the battery from the battery compartment.
4. Replace the battery with a new 9V battery (NEDA1604,
6F22 or 006P)
5. Replace the case bottom and battery compartment, and
reinstall the screw.
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Model 72-8150: OPERATING MANUAL
C. Replacing the Fuse (see figure 8)
SC
RE
W
(figure 8)
Warning
To avoid injury due to electrical shock or arc blast,
and to avoid damage to the Meter, use specified fuses
ONLY in accordance with the following procedure.
To replace the Meter’s fuse:
1. Turn the Meter power off and remove all connections
from the terminals.
2. Remove the screw from the battery compartment, and
separate the battery compartment from the case bottom.
3. Remove the screws from the case bottom, and separate
the case top from the case bottom.
4. Remove the fuse by gently prying one end loose, then
take out the fuse from its bracket.
5. Install ONLY replacement fuses with the identical type
and specification as follows and make sure the fuse is
fixed firmly in the bracket.
Fuse 1: 0.315A, 250V, fast type fuse, 5x20 mm.
6. Replace the battery compartment and the case top, and
reinstall the screw.
7. Replace the case bottom and case top, and reinstall the
screws.
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Model 72-8150: OPERATING MANUAL
Fuse replacement is seldom required. Blown fuses are
typically a result of improper use.
** END **
This operating manual is subject to change without notice.
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Model 72-8150: OPERATING MANUAL
Copyright 2006 Tenma Test Equipment.
All rights reserved.
Tenma Test Equipment
405 S. Pioneer Blvd.
Springboro,Ohio 45066
www.tenma.com
26
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