Victor 8145B User manual

1
DUAL DISPLAY MULTIMETER
USER’S MANUAL
CAUTION
THIS IS AN IEC SAFETY CLASS 1PRODUCT. THE GROUND WIRE IN THE LINE CORD MUST BE CONNECTED
FOR SAFETY.
WARRANTY
Our company warrants to the original purchaser that each product it manufactures will be free from defects in
material and workmanship under normal use and service for a period of one year from date of purchase. Our
company’s warranty does not apply to fuses, test leads or any product which, in our company’s opinion, has been
misused, altered, or damaged by accident or abnormal conditions of operation or handling.
To obtain warranty service, contact the nearest Service Center or send the product, with a description of the difficulty,
and postage prepaid, to the nearest Service Center. We assume no risk for the damage in transit. We will, at its
option, repair or replace the defective product free of charge or refund your purchase price. However, if we determine
that the failure was caused by misuse, alterations, accident or abnormal condition of operation or handing, you will
be billed for the repair and the repaired product will be returned to you transportation prepaid.
SHIPPING TO MANUFACTURER FOR REPAIR OR ADJUSTMENT
All shipment of our company’s instruments should be made via United Parcel Service or “Best Way” prepaid. The
instrument should be shipped in the original carton; or if it is not available, use any suitable container that is rigid and
of adequate size. If a substitute container is used, the instrument should be wrapped in paper and surrounded with at
least four inches of excelsior or similar shock-absorbing material.
CLAIM FOR DAMAGE IN SHIPMENT TO ORIGINAL PURCHASER
The instrument should be thoroughly inspected immediately upon original delivery to purchaser. All material in the
container should be checked against the enclosed packing list. The manufacturer will not be responsible for
shortages against the packing sheet unless notified immediately. If the instrument is damaged in any way, a claim
should be filed with the carrier immediately. (To obtain a quotation to repair shipment damage, contact the nearest
Service Center.) Final claim and negotiations with the carrier must be completed by the customer.

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Section 1
Introduction
INTRODUCING THE DUAL DISPLAY MULTIMETER
In this manual, “WARNING” is reserved for conditions and actions that pose hazard(s) to the user;
“CAUTION” is reserved for conditions and actions that may damage your meter.
NOTE
This manual contains information and warnings that must be followed to ensure safe operation and
retain the meter in safe condition. WARNING
READ THE “MULTIMETER SAFETY” SHEET BEFORE USING THE METER.
The Dual Display Multimeter is a 5-digit high resolution mode. The meter is designed for bench-top.
The features provided by the meter are:
zA dual, Liquid Crystal, Display that allows two properties of an input signal to be displayed at the
same time
zTrue rms AC.
z30 MHz in frequency measurement
z10µV sensitivity in volts DC
zDecibels with variable reference impedance measurement capability.
zA compare mode to determine if a measurement is within, above, or below a designated range.
zSlow and Fast selectable count resolution, with reading speeds of 3 and 6 reading per second,
respectively.
zBuilt-in self-tests with closed-case calibration (no internal calibration adjustment).
zIsolation of Universal Serial Bus(USB) Port
zRemote Control, display, record, Data Analysis, print with computer.
WHERE TO GO FROM HERE
This manual has been organized to assist you in getting started quickly. It is not necessary for you to
read the entire manual before using the meter effectively. However, we recommend that you do so in
order to use your meter to its full advantage.
Begin by scanning the Table of Contents to familiarize yourself with the organization of the manual.
Then, read Section 2, “GETTING STARTED”. Refer to the appropriate section of the manual as
needed. The contents of each section are summarized below.
SECTION 1. INTRODUCTION
Introduces the Dual Display Multimeter, describing its features and users manual.
SECTION 2. GETTING STARTED
Explains how to prepare the meter for operation and get started quickly taking basic measurements
from the front panel.
SECTION 3. OPERATING THE METER FROM THE FRONT PANEL
Provides a complete description of each operation that can be performed using the pushbuttons on
the front panel. Section 3 is organized so that related operations and functions are grouped together.
SECTION 4. MAINTENANCE
Describes how to perform basic maintenance and how to replacing fuses as order
SECTION 5. CALIBRATION
Introduces the required equipment, ambient environment station for calibration and the process of
calibration.
SECTION 6. SPECIFICATIONS
MULTIMETER SAFETY
The Dual Display Multimeter has been designed and tested according to IEC Publication 1010 Safety
Requirements for Electronic Measuring Apparatus. This manual contains information and warnings

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which must be followed to ensure safe operation and retain the meter in safe condition.
Some common international electrical symbols used in this manual are shown below.
○
OFF(power)
SWITCH POSITION
DANGEROUS
VOLTAGE
ON(power)
SWITCH POSITION
EARTH GROUND
~ AC-ALTERNATING
CURRENT
WARNING INFORMATION
DC-DIRECT
CURRENT
Before using the meter, read the following safety information carefully.
zAvoid working alone.
zFollow all safety procedures for equipment being tested.
zInspect the test leads for damaged insulation or exposed metal. Check test lead continuity.
Damaged leads should be replaced.
zBe sure the meter is in good operating condition.
zSelect the proper function for your measurement.
zTo avoid electrical shock, display “ ‘ when working above 30V dc or 30V ac RMS.
zDisconnect the live test lead (VΩ ) before disconnecting the common test lead (COM).
zDisconnect the power and discharge high-voltage capacitors before testing in Ω, and .
zWhen making a current measurement, turn the circuit power off before connecting the meter in
the circuit.
zCheck meter fuses before measuring transformer secondary or motor winding current; (See
Section 4, “MAINTENANCE”) An open fuse may allow high voltage build-up, which is potentially
hazardous.
Section 2
Getting Started
INTRODUCTION
Section 2 explains how to prepare the meter for operation, discusses general operating features, and
walks you through the basics of taking some common measurements,
GETTING STARTED
Unpacking and Inspecting the Meter
Carefully remove the meter from its shipping container and inspect it for possible damage or missing
items. If the meter is damaged or something is missing, contact the place of purchase immediately.
Save the container and packing material in case you have to return the meter.
Front Panel and Rear Panel
The front panel (shown in Figure 2-1) has three main elements: the input terminals on the right, the
display and the pushbuttons.
The pushbuttons are used to
select major functions, ranging
operations, and function
modifiers. These elements are
described in detail in Section 3.
DCV
ACV FREQ
DCA
ACA
AUTO
MN
SHIFT
MX
HOLD
COMP
ON
1
POWER
OFF
0
ALL INPUTS
1KV MAX
FAST FUSE
500mA 250V
mA
10A FUSED
750V
1000V MAX
RANGE
dBm
REL
RATE
DUAL DISPLAY MULTIMETER
8145B

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Figure 2-1. Front Panel
The rear panel (shown in Figure 2-2) contains the power-line cord connector, communication
interface, the Serial Number Label.
Figure 2-2. Rear Panel
ADJUSTING THE HANDLE
For bench-top use, the handle can be positioned to provide different viewing angles. To adjust its
position, pull the ends out to a hard stop and rotate it to a position. To remove the handle, adjust it to
the vertical stop position and pull the ends all the way out.
POWER CAUTION
TO AVOID SHOCK HAZARD, CONNECT THE INSTRUMENT POWER CORD TO A POWER
RECEPTACLE WITH EARTH GROUND.
NOTE
Apply the rated voltage and frequency to the meter as marked on the rear panel of the meter.
TURING THE METER ON
To turn the meter on, press the POWER button located on the lower-left of the front panel. If you turn
the meter off, you must wait five seconds before turning the meter back on. If you do not, the meter
will not power-up.
When the meter is turned on, the full screen displays light while the instrument performs an internal
self-test of its digital circuitry. These tests check RAM, ROM, A/D, and the display. The meter has
passed all tests and is ready for normal operation if an error code is not displayed.
After the meter completes the power-up sequence, it assumes the power-up measurement
configuration stored in non-volatile memory. The power-up configuration set at the factory is shown
in Table 3-6. (To change the power-up configuration, refer to “CHANGING THE POWER-UP
CONFIGURATION” in Section 3.)
USING THE PUSHBUTTONS
The pushbuttons on the front panel select meter functions and operations. A summary of basic
pushbutton operations is shown in Figure2-3.
Figure 2-3. Summary of Basic Pushbutton Operations
Pushbuttons can be used in two ways. You can:
zPress a single button to select a function or operation.
DCV
ACV FREQ
DCA
ACA
AUTO
MN
SHIFT
MX
HOLD
COMP
ON
1
POWER
OFF
0
RANGE
dBm
REL
RATE
FUNCTION BUTTONS
FUNCTION MODIFIER BUTTONS
RANGE BUTTONS
BACK LIGHT
Press in to Power-up
Press to Step Through
Measurement Rate(Slow,Fast)
Press to Select a Function
Press to Select a Modifier M ode
Press to Select a Range
AC220V 50Hz
THERE ARE NO PARTS TO DISASSEMBLE,
NO MECHANICAL ADJUSTMENTS TO MAKE,
ITIS DISALLOWEDTO OPENTHE CASE.
TO AVOID SHOCK HAZARD, CONNECT THE
INSTRUMENT POWER CORD TO A POWER
RECEPTACLE WITH EARTH GROUND.
USB

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EXAMPLE: Press ACV to select volts ac function.
zPress a combination of buttons, one after the other.
EXAMPLE: Press ACV to select volts ac function, and then press REL to select the decibels
modifier.
For more details on the uses of each button, refer to Section 3, “OPERATION THE METER FROM
THE FRONT PANEL.”
SELECTING A MEASUREMENT RANGE
Measurement ranges can be selected automatically by the meter in “autorange” or manually by the
user. In the autorange mode, the meter selects the appropriate range for the measurement reading.
To manually select a range, press AUTO to toggle in (and out) of the manual ranging mode, or press
or . In the manual range mode, press or to up range or down range to the desired
range. For more details on ranging, refer to “RANGING” in Section 3.
TAKING SOME BASIC MEASUREMENTS WARNING
READ “MULTIMETER SAFETY” BEFORE OPERATING THIS METER.
The following procedures describe the basics of taking common measurements from the front panel.
These procedures are provided for the user who needs to get started quickly, but dose not want to
read the rest of the manual at this time. However, in order to take full advantage of your meter, you
should read the remainder of this manual carefully and completely.
WARNING
TO AVOID ELECTRICAL SHOCK OR DAMAGE TO THE METER, DO NOT APPLY MORE THAN
1000V (PEAK) BETWEEN ANY TERMINAL AND EARTH GROUND. THE METER IS PROTECTED
AGAINST OVERLOADS UP TO THE LIMITS SHOWN IN TABLE 3-1. EXCEEDING THESE LIMITS
POSES A HAZARD TO THE METER AND OPERATOR.
Measuring Voltage, Resistance, or Frequency
To measure voltage, resistance, or frequency, press the desired function button and connect the test
leads as shown in Figure 2-4. The meter will select the appropriate range in the autorange mode.
Measuring Current
To measure current, insert the red test lead in the mA
input terminal for currents up to 330mA or in the 10A input
terminal for higher current, and insert the black test lead in the
COM terminal.
Connect the test leads as shown in Figure 2-5.
NOTE
After measuring high current using the 10A input, thermal
voltages are generated that may create errors when making
low-level dc measurements of volts, current, or ohms. To make
the most accurate measurements, allow up to ten minutes for the
thermals to settle out.
Figure2-5. Measuring Current
Diode/Continuity Testing
The continuity test determines whether a circuit is intact (i.e., has a
resistance less than about 150). To perform a continuity test, press ,
and connect the test leads as shown in Figure 2-6. The beeper emits a
MAX
750V
1000V
10A FUSED
250V
ALL INPUTS
1KV MAX
FAST FUSE
500mA
mA
TEST
CI RCUI T
+
-
Figure 2-6. Continuity Testing
MAX
750V
1000V
10A FUSED
250V
ALL INPUTS
1KV MAX
FAST FUSE
500mA
mA
DC Voltage,Pesistance
or AC Voltage
Figure 2-4. Measuring DC Voltage, Resistance, AC Voltage
MAX
750V
1000V
10A FUSED
250V
ALL INPUTS
1KV MAX
FAST FUSE
500mA
mA
CURRENT
SOURCE mA
A

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continuous beep when the input drops below 150(Beep condition can be changed, refer to
“Changing the Power-UP Configuration” later in Section 3), and the readings for the test circuit are
displayed.
The diode test measures the forward voltage of a semiconductor junction at approximately 0.8mA. Readings
are displayed in the 3V range at the fast measurement rates. “OL” is displayed for voltages above 2.0V. Under
normal measurement condition, the positive pole of diode is connected with the black test lead.
To perform a diode or transistor junction test, press to select the
diode function. Then connect the test leads across the diode as shown
in Figure 2-7.
Notice how the test leads are placed. Reversing the polarity will
reverse-bias the diode.
dBm (Decibels) measure
The decibels modifier takes an ac voltage measurement, converts it to dBm (measure of decibels
relative to one milliwatt), and displays the result on the primary display. Connect the test leads as
shown in Figure 2-4.
Press dBm to toggle in and out of the decibels mode. When the decibels mode is selected, “dBm” is
shown on the primary display, AC voltage value is shown on the secondary display.
Decibels can be selected only when ac voltage function is selected. Decibels are always displayed in
a single, fixed range with 0.01 dB resolution. Press the AUTO toggle in and out autorange, you can
also press the . and change range manually.
A voltage measurement is converted to dBm using the following formula:
dBm = 10*lg (1000*value2/reference impedance)
where “value” is the measurement value, and displayed on the secondary display. The reference impedance
can be changed. (Refer to “Changing the Power-UP Configuration” later in Section 3).
Communication Interface
The real time measured value can be transmitted to the computer by the devote USB cable and the
VICTORVIEW_8145B software (refer to “using the communication function”in section 3).
SECTION 3
Operating the Meter from the Front Panel
INTRODUCTION
Section 3 explains how to operate the meter from the front panel.
FRONT PANEL OPERATIONS
The following operations can be performed from the front panel:
zSelect a measurement function ( DCV, ACV, DCA, ACA, , FREQ, dBm
and )
zSelect function modifiers that cause the meter to display relative readings (REL),
minimum ,maximum or average values (MN MX)
zEnter the Touch Hold mode (HOLD) to hold a reading on the display
zSet Measurement Rate (RATE), change the rate as “F”(Fast) or “S”(Slow)
zTake a measurement and compare (COMP) it to a setting value
zSelect the manual or autorange mode (AUTO), up range or down range manually
MAX
750V
1000V
10A FUSED
250V
ALL INPUTS
1KV MAX
FAST FUSE
500mA
mA
Figure 2-7. Diode Testing

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to desired range
zTurn on or turn off the back light (when arrive the setting time the back light can automatically off)
zPower-on or off the power supply (POWER)
These operations are described in remainder of Section 3.
DISPLAY
The meter has a 5-digit, Liquid Crystal Display (Primary Display) and a 4-digit, Liquid Crystal Display
(Secondary Display). The display shows measurement readings, measurement units and messages.
As shown in Figure 3-1.
INPUT TERMINALS
The input terminals, as shown in Figure 3-2, are located
on the right of the front panel
The meter is protected against overloads up to the
limits shown in Table 3-1. Exceeding these limits poses
a hazard to both the meter and operator.
Figure 3-2. Input Terminals
Table 3-1. Input Limits
FUNCTION INPUT TERMINALS MAXIMUM INPUT
V Vand COM 1000V dc on all ranges
V ~, FREQ and dBm Vand COM 750V ac rms,1000V peak on all ranges
mA and mA ~mA and COM 500mA dc or ac rms
A ~and A ~10A and COM 10A dc or ac rms
Vand COM 250V dc or ac rms on all ranges
Vand COM 250V dc or ac rms on all ranges
All Functions Any terminal to earth 1000V dc or ac peak
SELECTING A MEASUREMENT FUNCTION
Press a function button, as shown in Figure 3-3, to select a measurement function. When you select
a function, annunciators turn on to indicate the function selected. Rang and full scale values are
summarized in Table 3-2 for voltage, current, ohms and frequency
Reading Rate
High Voltage
Relative Modifier
Primary Display
Diode Test Continuity Test Save
Function and Unit
Annunciators
Secondary Display
Time
Hold
MIN MAX
Modifier
Autorange
C
alibration state
Figure 3-1. Display Annunciators
MAX
750V
1000V
10A FUSED
250V
ALL INPUTS
1KV MAX
FAST FUSE
500mA
mA
Volts, Ohms, Diode Test input Terminal
Common Terminal. Retern Terminal
for all Measurements
Amperes Input Terminal. For
Current Measurements up to 10A
continuous
Milliamperes Input Terminal.
For Current Measurements
up to 500mA

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DCV
ACV FREQ
DCA
ACA
AUTO
MN
SHIFT
MX
HOLD
COMP
ON
1
POWER
OFF
0
RANGE
dBm
REL
RATE
读数速率键
AUTO
Press to Toggle In and Out of Autorange
Press to Enter Manual Range and Up Range
Press to Enter Manual Range and Down Range
Figure 3-3. Function Select Buttons
Table 3-2. Voltage, Current, Ohms and Frequency Rang and Full Scale Value
FUNCITION RANG FULLSCALE INFORMATION
V ~ and V
300mV 330.00mV
*760V ac rms
3V 3.3000V
30V 33.000 V
300 V 330.00 V
1000V* 1100.0 V*
mA ~and mA 0.3mA** 0.33000 mA**
**AC current have not 0.3mA and
3mA range
3mA** 3.3000 mA**
30mA 33.000 mA
300 mA 330.00 mA
A ~ and A 10A 11.000A
Resistance
300Ω 330.00Ω
3KΩ3.3000 KΩ
30 KΩ33.000 KΩ
300 KΩ330.00 KΩ
3MΩ3.3000 MΩ
30 MΩ33.000 MΩ
100 MΩ110 MΩ
Frequency
300Hz 330.00 Hz
30MHz range have not full scale
3KHz 3.3000 KHz
30KHz 33.000 KHz
300KHz 330.00 KHz
3MHz 3.3000 MHz
30MHz /
ANGING(AUTO, , )
Ranging operations are performed using the AUTO, and buttons (see Figure 3-4).
Autoranging
When you are in the autorange mode, the “AUTO” annunciator is lit.
In autorange, the meter automatically selects
the next higher range when a reading is
greater than full scale. If no higher range is
available, “OL” (overload) is displayed. The
meter automatically selects a lower range
when a reading is less than approximately
10% of the selected range.
Figure 3-4. Range Selection Butons
DCV
ACV FREQ
DCA
ACA
AUTO
MN
SHIFT
MX
HOLD
COMP
ON
1
POWER
OFF
0
RANGE
dBm
REL
RATE
reading rate
ACA FREQ
DCA
ACV
DCV
Volts DC Amps DC R esistan ce
Volts AC
Amps AC
Diode
Continuity
Frequency
dBm
dBm

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Manual Ranging
Press AUTO to toggle in and out of manual ranging. The range you are in when you enter the manual
range mode becomes the selected range.
In manual range, the meter remains in the selected range regardless of input. Press AUTO to toggle
back to autoranging.
Press to up range. If the is pressed when the meter is still in autorange, manual ranging is
selected, the “AUTO” annunciator turns off, and the next higher range is selected (if there is one).
Press to down range. If the is pressed when the meter is still in autorange, manual ranging
is selected, the “AUTO” annunciator turns off, and the next lower range is selected (if there is one).
When one function of Volts DC, Amps DC, Volts AC, Amps AC, Resistance or FREQ is selected, the
selected range is displayed on the secondary display.
MEASURING FREQUENCY ( FREQ )
Press the FREQ button to select the frequency function, the frequency is displayed on the primary
display and the selected range is displayed on the secondary display. Select the rang manually or
automatically
Frequency Measurement Rates
The rate at which frequency measurements are taken is selected by the meter automatically, when the
frequency function has been selected, press RATE has no effect on the frequency update rate.
Frequency Sensitivity Selection
Before a frequency measurement is started, the amplitude of the input signal is sampled and the
optimum ac voltage range is selected automatically. For more information refer to the Section 6 for ac
voltage sensitivity.
The input signal sensitivity is based on sine waveforms. If the input signal is below the required level,
the frequency will be displayed as zero. If the measurements are unstable, the input signal may be near
the threshold level.
SELECT A FUNCTION MODIFIER ( REL , HOLD , MNMX , COMP )
Selec
ting a function modifier causes the meter to perform an
action on an input (e.g., convert to relative reading
mode or compare to another value) before a reading is
displayed. To use a function modifier, press a function
button to select a primary function, and then press a
function modifier button. See Figure 3-5
REL (Relative Readings) Modifier
Press REL to select the relative modifier. When the relative modifier is selected: the last valid reading
is stored as the relative base and displayed on the secondary display. The reading on the primary
display is always the difference between the relative base and an input measurement, and the “△”
annunciator turn on.
REL=present reading - relative base
For example, if the relative base is 15.000V, and the present reading is 14.100V, the
display will show -0.900V.
WARING
REMEMBER, A RELATIVE READING MAY NOT INDICATE THE PRESENCE OF DANGEROUS
VOLTAGES AT THE INPUT CONNECTORS OR TEST LEADS. USE CAUTION TO AVOID
ELECTRICAL SHOCK OR DAMAGE TO THE METER.
Press REL again, the relative base is displayed on the secondary display. The reading on the primary
display is REL%, and the “%” annunciator turn on simultaneous.
DCV
ACV FREQ
DCA
ACA
AUTO
MN
SHIFT
MX
HOLD
COMP
ON
1
POWER
OFF
0
RANGE
dBm
REL
RATE
读数速率键
REL COMP
HOLD
MXMN
R e la tive M od ifier
M N M X M odifier
Com pare M odifier
Touch Hold M odifier
Figure 3-5. Function M odifier S election Buttons
REL%=
present reading-relative base
relative base ×100%

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For example, if the relative base is 15.000V, and the present reading is 14.100V, the display will show
-6%. Press REL again to exit the relative modifier.
NOTE
The relative modifier cannot be selected if the display shows “OL” or is blank. (The display would be
blank, for example, because of range changes.)
Selecting the relative modifier (REL) turns off autoranging and locks in the present range. Make sure
you are in the correct range before selecting the relative modifier. If you press other buttons after the
relative modifier has been selected, you will automatically exit REL.
HOLD (Touch Hold) Modifier
The Touch Hold modifier allows you to hold the measurement reading on the display.
Press HOLD to select the Touch Hold modifier. When Touch Hold is selected, “HOLD” annunciator is
lit on, and the beeper emits a single beep. Press HOLD again to exit Touch Hold modifier, and the
beeper emits a single beep.
MN MX AVG (Minimum Maximum Average) Modifier
The MN MX modifier causes the meter to store the minimum and maximum inputs measured since the
MN MX AVG modifier was selected. Press MN MX to select the MN MX AVG modifier. When the MN
MX AVG modifier is first selected, the minimum, maximum and average values are set to the displayed
reading and the “MAX” annunciator lights, once the maximum value showed on the primary display,
the beeper emits a single beep. Press MN MX again to display the minimum reading and the “MIN”
annunciator lights, once the minimum value showed on the primary display, the beeper emits a single
beep. Press MN MX again to display the average reading on the primary display (“AVG” annunciator
lights). Each subsequent press the MN MX button toggles among the minimum, maximum and
average measurements taken. The measurement reading displayed on the secondary display. To exit
the MN MX AVG modifier, press and hold down the MN MX button for two seconds or press other
function buttons.
Selecting the MN MX AVG modifier turns off autoranging and locks in the present range. Make sure
you are in the correct range before selecting the MN MX AVG modifier.
COMP (Compare) Modifier
The compare function (COMP) provides an easy way to determine if a reading falls within a
designated range of values. In the compare mode, the meter displays a reading in the secondary
display and indicates in the primary display if that value is lower (CO-LO) than, higher (CO-HI) than, or
within a range (PASS) you selected, if the reading lower or higher, the beeper emits a continuous tone.
Compare Modifier can be used under dc voltage, ac voltage, dc current, ac current and omh function,
in compare mode, the meter is in manually range mode..
Following the step to enter Compare Modifier
zSelect a function and a range
zPress COMP to toggle in Compare Modifier
zBefore selecting the compare function, set the high and low compare point first, when compare
modifier selected, “MAX” annunciator lights, and the leftmost digit on the primary display is
flashing, then can set the high point, press AUTO to select the digit to be set, each press AUTO
causes the digit to the right to be selected and flashing, press or to up or down
the flashing digit. Press the COMP again, “MIN” annunciator lights, and the leftmost digit on the
primary display is flashing, then can set the low point, press AUTO to select the digit to be set,
each press AUTO causes the digit to the right to be selected and flashing, press or to
up or down the flashing digit. Each subsequent press the COMP button toggles between high
set, low set and compare measurements taken. To exit the Compare Modifier, press and hold
down the COMP button for two seconds or press other function buttons.

11
Selecting the Compare Modifier turns off autoranging and locks in the present range. Make sure you
are in the correct range before selecting the Compare Modifier.
The function modifier is relative to the measurement function refer to the Table 3-5
Table 3-5. function modifier and measurement function
FUN.Modifier
Function
REL HOLD MNMX COMP
DCV √√√√
ACV √√√√
DCA √√√√
ACA √√√√
Ω√√√√
FREQ √
√
√
dBm √
SELECTING A MEASUREMENT RATE (RATE)
The meter takes measurements at one of two, user-selectable rates: slow and fast. The rate selected
is indicated by “S”, “F” on the display.
Press the RATE to change the measurement rates at “S” or “F”. The selected rate applies to DCV、
DCA、、ACV、ACA、dBm.
Note:
zIn Diode and Continuity Testing, the default rate is “F”
zIn 30M and 300M rang, the default rate is “S”
Connect with the USB
Plug the one end of the devote USB cable to the communication connector on the real panel, plug the
other end of the cable to the USB port of the computer, running the devote DMMVIEW_8145B software, set
the corresponding connector port to achieve online. When success, the COMM annunciator is lit on, the
instrument transmits measured value and state to computer, thus, the computer can remote Control, display,
record, Data Analysis, print all the measurement process. use the software stop the communication, the
instrument stop transmit measured value and the COMM annunciator disappear．
POWER-UP CONFIGURATION
Factory Setting of Power-Up Configuration
When the meter is turned on and completes the power-up sequence, it assumes its power-up
configuration. The power-up configuration set at the factory is shown in Table3-6.
Table 3-6. Power-Up Configuration Set at Factory
PARAMETER CONFIGURATIONS REMARK
Function Setting
Range Mode
Reading Rate
DC volt（DCV）
Autorange（AUTO）
Slow（S）
Reference Impedance（for dBm）600Changeable
Compare set value 0

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MIN/MAX/AVG
Relative Base value
0
0
Frequency of Power 50Hz Changeable
Back Light Time 0000 S Changeable
Continuity beep when the input drops below 150Changeable
Compare beep if the reading lower or higher set value Changeable
Changing the Power-Up Configuration
You can change the power-up configuration to one that more closely meet your needs and preferences.
To change the Power-Up Configuration, power-up the meter and press SHIFT simultaneity
1. Change Back Light Time: Press AUTO, when “bLOFF” is annunciator showed on the primary
display. The value of setting is showed on the secondary display, then press
or to step up or down the setting value with 30S. The limit of the setting value is
3600S(1 hour), when the setting value is “0000” indicates that back light only be turned off
manually. Press the HOLD save the set value, the “memory” annunciator is lit on.
2. Change Frequency of Power: Press AUTO, when “FrSET” annunciator is showed on the primary
display, the Frequency is showed on the secondary display, then press or
to select the frequency at 50Hz or 60Hz. (Once change the Frequency of Power, the meter
should be calibrated newly). Press the HOLD save the set value, the “memory” annunciator is lit
on.
3. Change the Reference Impedance: Press AUTO, when “CONS” annunciator is showed on the
primary display, the Reference Impedance is showed on the secondary display. Then press
or to select the needed value (supplied value are 50, 75, 93, 100, 150, 300, 500, 600, 800,
1200, 2400 (unit: )). Press the HOLD save the set value, the “memory” annunciator is lit on.
4. Change the continuity beep mode: Press AUTO, when “CH-BB” annunciator is showed on the
primary display, the “YES”(connect beep) or ”NO”(disconnect beep) is showed on the secondary
display. Press the HOLD save the set value, the “memory” annunciator is lit on.
5. Change the compare beep mode: Press AUTO, when “CO-BB” annunciator is showed on the
primary display, the “YES”(inside the limiter) or ”NO”(exceed the limiter) is showed on the
secondary display. Press the HOLD save the set value, the “memory” annunciator is lit on.
6. Factory set: Press AUTO, when “FACTY” annunciator is showed on the primary display, select
the default factory set. To resume the factory set, Press the HOLD save the default value. To exit
factory set mode, power off the instrument.
SECTION 4
Maintenance
NOTE
When servicing the meter, use only the replacement parts specified
INTRODUCTION
Section 4 provides the information necessary for the user to perform basic maintenance. Users should
not attempt to perform maintenance not described in this section. Qualified service personnel should
refer to this Manual for complete maintenance, service.
CAUTION
TO AVOID ELECTRICAL SHOCK OR DAMAGING THE METER, NEVER GET WATER INSIDE

13
THE CASE. TO AVOID DAMAGING THE METER HOUSING, NEVER APPLY SOLVENTS TO THE
METER. IF THE METER REQUIRES CLEANING, WIPE IT DOWN WITH A CLOTH THAT IS
LIGHTLY DAMPENED WITH WATE OR A MILD DETERGENT. DO NOT USE AROMATIC
HYDROCARBONS, CHLORINATED SOLVENTS, OR METHANOL-BASED FLUIDS WHEN
WIPING DOWN THE METER.
THE LINE FUSE
CAUTION
OPENING THE CASE MAY EXPOSE HAZARDOUS VOLTAGES. ALWAYS DISCONNECT THE
POWER CORD AND MEASURING INPUTS BEFORE OPENING THE CASE.
1. Remove the screw on each side of the real bezel.
2. Remove the case from the meter. The fuse is visible at the front of the main printed circuit
assembly near the power. The meter uses a 0.2A, 250V (Slow blow) line fuse.
3. Carefully remove the fuse and replace it with one rated as listed above
4. Reverse the disassembly procedure to reassemble the meter.
CURRENT INPUT FUSES
300mA (include 300mA) and 10A inputs are protected by user-replaceable fuses.
zThe 300mA input is protected by a fuse rated at 500mA, 250V (Fast blow).
zThe 10A input is protected by a fuse rated at 11A, 250V (Fast blow).
Testing Current Input Fuses
Perform the following procedure to test these fuses:
1. Short the Vinput terminal and the mA terminal with a test lead.
2. Press to select the ohms function. Insert the test lead probe into the mA input terminal. If the
fuse is good, the meter will read between 1to 19. If the fuse is blown, the meter will
read >10Mto OL.
3. Remove the test lead probe from the mA input terminal and insert it into the 10A input terminal. If
the fuse is good, the meter will read between 0.00 and 0.05. If the fuse is blown, the meter will
read >10Mto OL.
Replacing the mA Input Fuse CAUTION
FOR PROTECTION AGAINST FIRE, REPLACE A BLOWN FUSE ONLY WITH ONE OF
IDENTICAL
The mA input fuse is mounted in the front panel input jack (see Figure 3-2). To replace this fuse, first
unplug the line cord. Then press in on the input jack and turn it 90 degrees counter-clock wise, slide
out the fuse holder and fuse.
Replace a blown fuse with one of identical rating and reinsert the fuse and holder into the input
terminal socket. Secure the fuse holder by pressing in and turning the holder 90 degrees clockwise.
Replacing the 10A Input Fuse CAUTION
OPENING THE CASE MAY EXPOSE HAZARDOUS VOLTAGES. ALWAYS DISCONNECT THE
POWER CORD AND MEASURING INPUTS BEFORE OPENING THE CASE.
The 10A input fuse is located inside the meter. To replace the fuse:
1. Remove the screw on the bottom of the case.
2. Remove the case from the meter. The fuse is visible on the main printed circuit, which is
connected with the 10A input terminal.
3. Carefully remove the fuse and replace it with one rated as listed above.
4. Reverse the disassembly procedure to reassemble the meter.
PERFORMANCE TESTS
The meter should be calibrated and in operating condition when you receive it.

14
The following performance tests are provided to ensure that the meter is in proper operating condition.
If the instrument fails any of the performance tests, then calibration adjustment and/or repair is
needed. To perform these tests, you will need a 5520A Multifunction Calibrator or equivalents. Each
of the measurements listed in the following steps assume the instrument is being tested after a
one-hour warmup, in an environment with an ambient temperature of 18 to 28℃, and a relative
humidity of less than70%.
NOTE
All measurements listed in the performance test tables are made in the slow reading rate unless
otherwise noted.
1. Connect a test lead from the Output NORMAL HI and LO connectors of the 5520A to the VΩ
and COM connectors on the meter (see Figure 4-1).
Select the Volts dc, Volts ac, Resistance or Frequency
function and range on the meter and the input level
from the 5520A. The display should meet the request
listed in Section 6.
2. Connect a test lead from the output AUX HI
and LO connectors of the 5520A to the mA
and COM connectors on the meter (see
Figure 4-2). Select the Current ac or
Current dc function and 300mA range on
the meter and the input level from the 5520A. The display should meet the request listed in
Section 6.
3. Connect a test lead from the output 20A HI and LO connectors of the 5520A to the 10A and COM
connectors on the meter (see Figure 4-3). Select the Current dc or Current ac function and 10A
range on the meter and the input level from the 5520A. The display read should meet the request
listed in Section 6.
SERVICE
If you suspect that the meter has failed, review this manual to make sure you are operating it correctly.
If the meter still fails to operate properly, pack it securely (in its original container if available) and
forward it, postage paid, to the nearest Service Center. Assumes no responsibility for damage in
transit.
SECTION 5
Calibration
INTRODUCTION
To ensure the accuracy and the stability of the meter, the meter should be calibrated on a regular cycle of one
year.
STANDARD SOURSE 5520A
AUX
NORMAL SCOPE
TRIG
OUT
MAX
750V
1000V
10A FUSED
250V
ALL INPUTS
1KV MAX
FAST FUSE
500mA
mA
Figure 4-1
STANDARD SOURCE 5520A
AUX
NORMAL SCOPE
TRIG
OUT
MAX
750V
1000V
10A FUSED
250V
ALL INPUTS
1KV MAX
FAST FUSE
500mA
mA
Figure 4-2.
STANDARD SOURCE 5520A
AUX
NORMAL SCOPE
TRIG
OUT
MAX
750V
1000V
10A FUSED
250V
ALL INPUTS
1KV MAX
FAST FUSE
500mA
mA
Figure 4-3.

15
REQUIRED EQUIPMENT (refer to the table5-1)
Table5-1. Recommended Test Equipment
Measurement Multifunction Range Accuracy±（%Output）Recommended Equipment
DCV 300mV,3V,30V,300V,
1000V 0.0002
FLUKE
5520A
ACV 300mV,3V,30V,300V,
1000V
20~50Hz 0.025
50 Hz~10KHz 0.015
10~20KHz 0.022
20~50KHz 0.03
OHMS
300,3K,30K, 300K0.004
3M,30 M,100 M0.05
DCA
0.3mA, 3mA, 30mA, 300mA 0.025
10A 0.1
ACA
3mA, 30mA, 300mA
20~50Hz 0.09
50 Hz~1KHz 0.04
1~5KHz 0.1
5~10KHz 0.16
10~30KHz 0.32
10A 50 Hz~5KHz 0.1
FREQ 300Hz ,3KHz 30KHz,300KHz
3MHz 30MHz 0.00025
3MHz/30MHz 时用
VC5020
AMBIENT ENVIRONMENT STATION
zTemperature: 23±2℃
zRelative humidity: 70%RH
zPower : varied at 5% of rated voltage
zFrequency of power: rated value±1Hz
zWarmup: 2 hours for standard equipment, 1 hour for measured meter
OPERATION FOR CALIBRATOR
Calibrate the functions and ranges listed in the table 5-2.
Table 5-2. INPUT SIGNAL
Function Range Input 1（First）Input 2（Second）Unit
Volts dc
DC300mV 300.00 mV
DC3V 3.0000 V
DC30V 30.000 V
DC300V 300.00 V
DC1000V 1000.0 V
Volts ac
AC300mV（1KHz）30.00 300.00 mV
AC3V（1KHz）0.3000 3.0000 V
AC30V（1KHz）3.000 30.000 V
AC300V（50Hz）30.00 300.00 V
AC750V（50Hz）75.0 750.0 V
Resistance
300300.00 
3K3.0000 K
30K30.000 K
300K300.00 K
3M3.0000 M
30M10.000 M
300M10.000 M
Current dc
DC0.3mA 0.30000 mA
DC3mA 3.0000 mA
DC30mA 30.000 mA

16
DC300mA 300.00 mA
DC10A 3.0000 A
Current ac
AC0.3mA（1KHz）0.03000 0.30000 mA
AC3mA（1KHz）0.3000 3.0000 mA
AC30mA（1KHz）3.000 30.000 mA
AC300mA（1KHz）30.00 300.00 mA
AC10A（1KHz）0.300 3.000 A
Frequency(3V
of sine wave) 3KHz 3.0000 KHz
NOTE
To calibrator the meter, connect the instrument power cord to a power receptacle with earth ground.
DC Volts calibration
1) Turn on the meter, press the DCA, dBm and button simultaneity to enter calibration mode, and
the “CAL” appears on the top left corner of the LCD(the “CAL” annunciator always appears in
calibration mode), and the meter default enter to 300mV DC volts calibration mode.
2) Placed the standard equipment in the “STBY” state, and connected with the meter as shown in Figure
5-1.
3) Set the standard equipment to DCV, and adjust until the display reads 300mV, press the OPR button
to output.
4) Press the SHIFT button of the meter to
calibrate the rated range for the DCV function,
and the display reads the calibrated point.
5) Press the REL button to save the calibrated
value after 5 seconds, and the “SAVE”
displayed on the LCD; if the “ERR” displayed,
check the set value for the standard equipment,
and inspect the function and the method of the
line connection right or not newly.
6) Press the button to change range (in calibration mode, the meter is in manual range)
7) Set the standard equipment to the required output.
8) Repeat step 4 to 7 until complete all range.
Note
Be sure that the standard equipment is in the “STBY” state before change the function.
DC 300mA amps calibration
1) Placed the standard equipment in the “STBY” state, press the DCA button and the meter default enter
to 300mA DC Amps calibration state.
2) Connect the standard equipment with the meter as shown in Figure 5-2.
3) Adjust the standard equipment until the display reads 300mA, press the OPR button to output.
4) Press the SHIFT button of the meter to calibrate the
300mA range, and the display reads the calibrated
point.
5) Press the REL button to save the calibrated value
after 5 seconds, and the “SAVE” displayed on the
LCD; if the “ERR” displayed, check the set value for
the standard equipment, and inspect the function and
the method of the line connection right or not newly
DC 10A amps calibration
1) Placed the standard equipment in the “STBY” state, press the DCA button to enter to DCA calibration
state.
standard source 5520A
AUXNORMAL SCOPE
TRIG
OUT
MAX
750V
1000V
10A FUSED
250V
ALL INPUTS
1KV MAX
FAST FUSE
500mA
mA
Figure 5-1
standard source 5520A
AUXNORMAL SCOPE
TRIG
OUT
MAX
750V
1000V
10A FUSED
250V
ALL INPUTS
1KV MAX
FAST FUSE
500mA
mA
Figure 5-2

17
2) Connect the standard equipment with the meter as
shown in Figure 5-3.
3) Press the button to select the 10A range.
4) Press the SHIFT button of the meter to calibrate
the 10A range, and the display reads 3A, Applied
the standard equipment 3A to the meter.
5) Press the REL button to save the calibrated value
after 5 seconds, and the “SAVE” displayed on the
LCD; if the “ERR” displayed, check the set value for
the standard equipment, and inspect the function and the method of the line connection right or not
newly.
AC Volts calibration
1) Placed the standard equipment in the “STBY” state, press the ACV button to enter to AC Volts
calibration state.
2) Connect the standard equipment with the meter as shown in Figure 5-1 before.
3) Press the SHIFT button of the meter enter to the 300mV range calibration.
4) Press the MNMX button of the meter, select the 30mV calibration point, and the “F” annunciator
appears on the top left corner of the LCD, 1KHz appears on the secondary display indicates the
frequency of the applied signal should be 1KHz.
5) Applied the standard equipment 30mV, 1KHz to the meter.
6) Keep the meter at least 20 seconds, press the REL button to save the calibrated value, and the
“SAVE” displayed on the LCD; if the “ERR” displayed, check the set value for the standard equipment,
and inspect the function and the method of the line connection right or not newly.
7) Press the MNMX button again to select the 300mV calibration point, and the “S” annunciator appears
on the top left corner of the LCD, 1KHz appears on the secondary display indicates the frequency of
the applied signal should be 1KHz.
8) Applied the standard equipment 300mV, 1KHz to the meter.
9) Keep the meter at least 20 seconds, press the REL button to save the calibrated value, and the
“SAVE” displayed on the LCD; if the “ERR” displayed, check the set value for the standard equipment,
and inspect the function and the method of the line connection right or not newly.
10) Press the button to change range.
11) Repeat step 3 to 10 until complete all range.
AC 30/300mA amps calibration
1) Placed the standard equipment in the “STBY” state, press the ACA button and the meter default enter
to 30mA AC calibration state.
2) Connect the standard equipment with the meter as shown in Figure 5-2 referred before.
3) Press the SHIFT button of the meter to calibrate the 30mA range.
4) Press the MNMX button of the meter, select the 3mA calibration point, and the “F” annunciator
appears on the top left corner of the LCD, 1KHz appears on the secondary display indicates the
frequency of the applied signal should be 1KHz.
5) Applied the standard equipment 3mA、1KHz to the meter.
6) Keep the meter at least 20 seconds, press the REL button to save the calibrated value, and the
“SAVE” displayed on the LCD; if the “ERR” displayed, check the set value for the standard equipment,
and inspect the function and the method of the line connection right or not newly.
7) Press the MNMX button again to select the 30mA calibration point, and the “S” annunciator appears
on the top left corner of the LCD, 1KHz appears on the secondary display indicates the frequency of
the applied signal should be 1KHz.
8) Applied the standard equipment 30mA、1KHz to the meter.
standard source 5520A
AUXNORMAL SCOPE
TRIG
OUT
MAX
750V
1000V
10A FUSED
250V
ALL INPUTS
1KV MAX
FAST FUSE
500mA
mA
Figure 5-3

18
9) Keep the meter at least 20 seconds, press the REL button to save the calibrated value, and the
“SAVE” displayed on the LCD; if the “ERR” displayed, check the set value for the standard equipment,
and inspect the function and the method of the line connection right or not newly.
10) Press the button change the range
11) Repeat step 3 to step 10 until complete all range.
AC 10A amps calibration
1) Placed the standard equipment in the “STBY” state, press the ACA button to enter to AC Amps
calibration state.
2) Connect the standard equipment with the meter as shown in Figure 5-4.
3) Press the button to select the 10A range.
4) Press the SHIFT button of the meter to calibrate the 10A range.
5) Press the MNMX button of the meter, select the 0.3A calibration point, and the “F” annunciator
appears on the top left corner of the LCD, 1KHz appears on the secondary display indicates the
frequency of the applied signal should be 1 KHz.
6) Applied the standard equipment 0.3 A,
1KHz to the meter.
7) Keep the meter at least 20 seconds, press
the REL button to save the calibrated value,
and the “SAVE” displayed on the LCD; if the
“ERR” displayed, check the set value for
the standard equipment, and inspect the
function and the method of the line
connection right or not newly.
8) Press the MNMX button again to select the
3A calibration point, and the “S” annunciator appears on the top left corner of the LCD, 1KHz appears
on the secondary display indicates the frequency of the applied signal should be 1KHz.
9) Placed the standard equipment in the “STBY” state, Connect the standard equipment with the meter
as shown in Figure 5-3 referred before.
10) Applied the standard equipment 3A, 1KHz to the meter.
11) Keep the meter at least 20 seconds, press the REL button to save the calibrated value, and the
“SAVE” displayed on the LCD; if the “ERR” displayed, check the set value for the standard equipment,
and inspect the function and the method of the line connection right or not newly.
12) Complete all range.
Frequency Calibration
1) Placed the standard equipment in the “STBY” state, press the FREQ button and the meter default
enter to 3KHz range calibration state.
2) Connect the standard equipment with the meter as shown in Figure 5-1 referred before.
3) Applied the standard equipment 3V of sine wave, 3KHz to the meter.
4) Press the SHIFT button of the meter to calibrate the indicated range displayed on the meter.
5) Keep the meter at least 5 seconds, press the REL button to save the calibrated value, and the “SAVE”
displayed on the LCD; if the “ERR” displayed, check the set value for the standard equipment, and inspect
the function and the method of the line connection right or not newly.
Ohms calibration
1) Placed the standard equipment in the “STBY” state, press the  button and the meter default enter to
300range calibration state.
2) Connect the standard equipment with the meter as
shown in Figure 5-5.
3) Applied the standard equipment 300to the meter,
and select 2-wire compensation on.
standard source 5520A
AUXNORMAL SCOPE
TRIG
OUT
MAX
750V
1000V
10A FUSED
250V
ALL INPUTS
1KV MAX
FAST FUSE
500mA
mA
Figure 5-4
standard source 5520A
AUXNORMAL SCOPE
TRIG
OUT
MAX
750V
1000V
10A FUSED
250V
ALL INPUTS
1KV MAX
FAST FUSE
500mA
mA
Figure 5-5

19
4) Press the SHIFT button of the meter to calibrate the indicated range displayed on the meter.
5) Keep the meter at least 10 seconds, press the REL button to save the calibrated value, and the “SAVE”
displayed on the LCD; if the “ERR” displayed, check the set value for the standard equipment, and inspect
the function and the method of the line connection right or not newly.
6) Press the button to change rang.
7) Applied the standard equipment indicated on the display to the meter, once the calibrated range above
300K, select 2-wire compensation on, remove the line connected with the AUX terminal of the standard
equipment.
8) Repeat step 5 to step 7 until complete all range.
SECTION 6
Specifications
INTRODUCTION
This Section contains the specifications of the Dual Display Multimeter. These specifications assume:
zA 1-year calibration cycle
zAn operating temperature of 18℃to 28℃(64.4℉~82.4℉)
zOne-hour warmup
zSlow reading rate
zRelative humidity not exceeding 70% (non_condensing)
Accuracy is expressed as ±(percentage of reading + digits).
READING RATES
DC VOLTAGE
Input Impedance
1000Mat 300mV and 3V. 10MΩ at other ranges.
Normal Mode Rejection Ratio (NMR)
≥60dB (at 50Hz or 60Hz)
Rate Readings per Second
Slow（S）3
Fast（F）5~7
Range Resolution Accuracy
300mV
3V
30V
300V
1000V
10uV
100uV
1mV
10mV
100mV
0.03%+3

20
Common Mode Rejection Ratio (CMR)
≥120dB (at 50Hz or 60Hz)
Maximum Input
1000V peak
TRUE RMS AC VOLTAGE, AC-COUPLED
Range Resolution Accuracy
20~50Hz 50 Hz~10KHz 10~20KHz 20~30KHz 30~50KHz
300mV 10uV
2%+30
0.5%+30
1%+80 5%+80 10%+150
3V 100uV
30V 1mV 3%+30
300V 10mV
750V 100mV
REMARK: Accuracy specifications apply to the range from 10% to 100%
Input Impedance
1Min parallel with 0.1µF
Maximum Crest Factor
3.0
Common Mode Rejection Ratio
>120dB at 50Hz or 60Hz (1Kunbalanced resistance)
Maximum Input
750V rms, 1000V peak.
DC CURRENT
Range Resolution Accuracy Input Impedance
300 mA 10uA 0.1%+3 1
10A 1 mA 1.5%+3 0.01
Maximum Input
300mA. Protected with a 500mA, 250V fast blow fuse; 10A. Protected with a 11A, 250V fast blow fuse.
for 30 seconds maximum.
TRUE RMS AC VOLTAGE, AC-COUPLED
Range Resolution Accuracy
20~50Hz 50 Hz ~2KHz 2~10 KHz 10~20 KHz 20~30 KHz
300mA 10uA 2%+30 0.5%+30 1%+80 5%+50
10A 1mA 1.5%+30 3%+30*
“*” indicates that the range for frequency between 2~5KHz
Maximum Input
300mA. Protected with a 500mA, 250V fast blow fuse; 10A. Protected with a 11A, 250V fast blow fuse.
for 30 seconds maximum.