Amprobe DM78B User manual

DM78BDM78B
Digital
Multimeter
Pocket-Size Meter with
Protective Folding Cover
Operators Manual
·
Bedienungsanleitung
·
Manual de Instrucciones
·
Manuel d'Utilisation
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MAX 450V
CAT. II
AUTO POWER OFF
OFF
VOLTS
DC / AC
RANGE
LOCK DATA
3200 Count Display
010
AC V
20 30
HOLD
H
UL
MAX 450V
DC / AC
DM78B
Data Hold
Anzeigesperre
Congelación de
lecturas
Maintien
d'Affichage
3-3/4 digit LCD
3-1/2 Digit LCD
LCD de 3-1/2 dígitos
LCD 3-1/2 digits
32-segment
Bargraph
32 Segment
Bargraf
Barra
Analógica de
33 segmentos
Bargraphe à
32 segments
Manual Range
Button
Manuelle
Bereichswahl
Selección Manual
Sélection Manuelle
Selector Switch
Wahlschalter
Selector
Sélecteur
Function Button
Funktionsknopf
Selector de
Función
Bouton de
Fonctions
DM78B Inside Cover

DM78B
Digital Multimeter
Users Manual
•Bedienungshandbuch
•Manual de Uso
•Mode d’emploi
PN 2728886
July 2006
©2006 Amprobe®Test Tools.
All rights reserved. Printed in Taiwan

Limited Warranty and Limitation of Liability
Your Amprobe®product will be free from defects in material and
workmanship for 1 year from the date of purchase. This warranty
does not cover fuses, disposable batteries or damage from
accident, neglect, misuse, alteration, contamination, or abnormal
conditions of operation or handling. Resellers are not authorized to
extend any other warranty on Amprobe®’s behalf. To obtain
service during the warranty period, return the product with proof
of purchase to an authorized Amprobe®Test Tools Service Center
or to a Amprobe®dealer or distributor. See Repair Section above
for details. THIS WARRANTY IS YOUR ONLY REMEDY. ALL
OTHER WARRANTIES - WHETHER EXPRESS, IMPLIED OR
STAUTORY - INCLUDING IMPLIED WARRANTIES OF FITNESS
FOR A PARTICULAR PURPOSE OR MERCHANTABILITY, ARE
HEREBY DISCLAIMED. MANUFACTURER SHALL NOT BE LIABLE
FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR CONSEQUENTIAL
DAMAGES OR LOSSES, ARISING FROM ANY CAUSE OR THEORY.
Since some states or countries do not allow the exclusion or
limitation of an implied warranty or of incidental or consequential
damages, this limitation of liability may not apply to you.

1
Digital Multimeter
Contents
Symbols ..............................................................................................1
Warnings and Precautions...................................................................1
Measuring Procedures.........................................................................2
Battery replacement.............................................................................3
Specifications ......................................................................................4
Repair..................................................................................................5
Symbols
B Battery WRefer to the manual
TDouble
insulated XDangerous Voltage
FDirect Current JEarth Ground
BAlternating
Current RAudible tone
I Fuse PComplies with EU
directives
Warnings and Precautions
•This instrument is EN61010-1 certified for Installation Category I
(600V). It may only be used to make measurements on energy
limited circuits within equipment and not directly connected to
mains.
•This instrument is IEC1010-1 certified for Installation Category II
300V. This instrument is EN61010-1 certified for Installation
Category II (300V). It is recommended for use with local level
power distribution, appliances, portable equipment, etc, where
only smaller transient overvoltages may occur, and not for
primary supply lines, overhead lines and cable systems.
•Do not exceed the maximum overload limits per function (see
specifications) nor the limits marked on the instrument itself.
•Exercise extreme caution when: measuring voltage >20V //
servicing CRT equipment.
•Inspect DMM, test leads and accessories before every use. Do
not use any damaged part.
•Never ground yourself when taking measurements. Do not touch
exposed circuit elements or probe tips.

2
•Do not operate instrument in an explosive atmosphere.
•Clean instrument with mild detergent only.
Buzzer
Note: The buzzer sounds for function change, Range Lock, Range
Hold, and continuity.
Measuring Procedures
General
Ranging: The meter defaults to autoranging when turned on, and
selects the range automatically. For Manual Ranging: press “Range
Lock” Button to hold selected range ( Zon the display ) Pressing
“Range Lock” again steps to next range. Hold button for 2 sec. to
return to Autorange mode.
Data Hold: Press the “Data Hold” Button to toggle in (“H”
displayed) and out of mode. Last reading is held on the display .
Press button again to release and display present readings.
Selector Switch . When the Selector Switch is in the ΩRG
position, press the Function Button to step between resistance,
continuity test (Ωand Rdisplayed), and diode test (G). When the
Selector Switch is in VOLTS position, press the Function Button to
step between AC voltage and DC voltage.
DC Voltage measurement
WWarning
For safety, do not attempt to measure voltages greater than
600 VDC.
1. Set function switch to VOLTS
2. If “AC” appears in display , press Function Button to select DC.
3. Connect black test lead to negative side of circuit being measured
and red lead to positive side.
4. Read value on display .
AC Voltage Measurement
WWarning
For safety, do not attempt to measure voltages greater than
600VAC.
1. Set Selector Switch to VOLTS.
2. Push Function Button so that “AC” appears in display .
3. Connect test leads to circuit. Connection must be in parallel with
circuit being measured.
4. Read value on display .

3
Resistance Measurement
WWarning
Before taking any in-circuit resistance measurements,
remove power to the circuit being tested and discharge all
capacitors in the circuit.
1. Set selector switch to ΩRG.
2. Press Function Button until O.L. and MΩappear on the display.
3. Connect the test leads to circuit.
4. Read value on the display.
Continuity Test
1. Set the Selector Switch to ΩRG
2. Press Function Button until Rappears in display.
3. Connect test leads to the circuit. Buzzer sounds when resistance is
< 35Ω
Diode Test
1. The diode should be disconnected from circuit. Required forward
voltage must be <1V.
2. Set selector switch to ΩRG.
3. Press Function Button until Gappears in display.
4. Connect black test lead to anode and red test lead to cathode of
the diode and note the reading.
5. Reverse test lead connections on diode. If the diode is good,
display will read half the value of step 3.
Battery Replacement
Power is supplied by two button-type batteries (NEDA 1166A or IEC
LR-44). “B” appears on the LCD display when replacement is needed.
WWarning
Before attempting to replace the battery, first disconnect the
test leads from any energized circuit.
1. Set Function Switch to off.
2. Remove battery cover screw
3. Slide off battery cover, note polarity, and change batteries (Fig -1-)
4. Replace battery cover and screw.

4
Specifications
General Specifications
Display: 3-3/4 digits LCD, 10mm high digits, max reading 3200.
Units/signs: AC, R, B, mV, V, Ω, kΩ, MΩ, G. Z, H, minus, and
decimal point.
Range selection: Autoranging and manual range lock.
Overrange indication: O.L.
Polarity indication: - is displayed; + in implied.
Battery warning: B displayed when <1.25V ±0.1V.
Sampling rate: 2/sec display. 20/sec bargraph.
Temperature/Humidity:
Operation: 0°to 40°C (32°to 104°F), <70% RH noncondensing:
Storage: -20°to 60°C (-4°to 140°F), <80% RH noncondensing.
Battery type: Two 1.5V (LR-44 or NEDA#1166A)
Battery life: 70 hours continuous operation.
Continuity test: buzzer alert.
Diode check: Good/Bad by the display value.
Battery saver: Turn-off after 10 minutes of non-use.
Dimensions (HXWXD) / Weight: 4.3”X2.2”X0.40”
(111.5x56x10.5mm) / 3oz (8.6g) including case.
Included with meter: Two 1.5V (LR-44) batteries, operator’s manual,
and carrying case.
Meets: EN61010-1:2001, Cat II 300V, Cat I 600V, UL1244;
EMC: Meets EN50081-1, EN50082-2
Agency Approvals: PEMC
This product complies with requirements of the following
European Community Directives: 89/336/EEC (Electromagnetic
Compatibility) and 73/23/EEC (Low Voltage) as amended by
93/68/EEC (CE Marking)
However, electrical noise or intense electromagnetic fields in the
vicinity of the equipment may distrub the measurement circuit.
Measuring instruments will also respond to unwanted signals that
may be present within the measurement circuit. Users should
exercise care and take appropriate precautions to avoid misleading
results when making measurements in the presence of electronic
interferences.

5
Electrical Specifications
(23 ° ± 5 ° C, 80% RH Max)
Maximum input, all functions/ranges: 600VDC or AC rms.
DC Voltage
Ranges: 320mV, 3.2, 32, 320, 600V
Resolution: 100μV in 320mV rg.
Accuracy: ±2.0%rdg. +2dgt (exc. 3.2V rg: ±1.0%rdg +2dgt)
Input impedance: 320mV rg: >100MΩ; 3.2V rg: 11MΩ; all other:
10MΩ.
AC Voltage
Ranges: 3.2, 32, 320, 600V.
Resolution: 1mV in 3.2V range
Accuracy: ±4.0%rdg. +5dgt
Input impedance: 3.2V rg: 11MΩ; all others 10MΩ.
Resistance
Ranges: 320Ω, 3.2, 32, 320kΩ, 3.2, 32 MΩ
Resolution: 100mΩin 320Ωrg
Accuracy: 320Ωrg: ±2.0%rdg. +4dgt; 3.2, 32, 320kΩrgs: ±2.0%rdg.
+2dgt; 3.2MΩrg: ±6.0%rdg. +2dgt, 32MΩrgs: ±10.0%rdg. +2dgt
Test Current (range/A): 320Ω/<0.7mA; 3.2kΩ/<0.13mA; 32kΩ/<13μA,
320KΩ/1.3μA; 3.2MΩ/<0.13μA; 32MΩ/0.6mA(Vf=o.6V)
Diode Test
Range: 3.2V
Accuracy: ±1.0% rdg + 2 dgt
Test current: 0.6 mA (Vf=0.6V)
Continuity Check
Range: 320Ω
Indication: at approx R ≤35Ω
Test Current: 0.7mA
Specifications subject to change without notice.
Repair
All test tools returned for warranty or non-warranty repair or for
calibration should be accompanied by the following: your name,
company’s name, address, telephone number, and proof of purchase.
Additionally, please include a brief description of the problem or the
service requested and include the test leads with the meter. Non-
warranty repair or replacement charges should be remitted in the form
of a check, a money order, credit card with expiration date, or a
purchase order made payable to Amprobe®Test Tools.
In-Warranty Repairs and Replacement – All Countries

6
Please read the warranty statement and check your battery before
requesting repair. During the warranty period any defective test tool
can be returned to your Amprobe®Test Tools distributor for an
exchange for the same or like product. Please check the “Where to
Buy” section on www.amprobe.com for a list of distributors near you.
Additionally, in the United States and Canada In-Warranty repair and
replacement units can also be sent to a Amprobe®Test Tools Service
Center (see below for address).
Non-Warranty Repairs and Replacement – US and Canada
Non-warranty repairs in the United States and Canada should be sent
to a Amprobe®Test Tools Service Center. Call Amprobe®Test Tools
or inquire at your point of purchase for current repair and replacement
rates.
..... In USA In Canada
.....Amprobe®Test Tools Amprobe®®Test Tools
.....Everett, WA 98203 Mississauga, ON L4Z 1X9
.....Tel: [phone] Tel: [phone]
.....Fax: [phone] Fax: [phone]
Non-Warranty Repairs and Replacement – Europe
European non-warranty units can be replaced by your Amprobe®Test
Tools distributor for a nominal charge. Please check the “Where to
Buy” section on www.amprobe.com for a list of distributors near you.
.....European Correspondence Address*
.....Amprobe®Test Tools Europe
.....P.O. Box 1186
.....5602 BD Eindhoven
.....The Netherlands
*(Correspondence only – no repair or replacement available from this
address. European customers please contact your distributor.)
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