VOLTCRAFT 2203066 User manual

VC-7055BT
Digital Multimeter
Quick Guide

i
Table of Contents
1.Safety Information ......................................................................................................1
Safety Terms and Symbols .....................................................................................................1
General Safety Requirements ................................................................................................2
Measurement Limits ..............................................................................................................3
Main Input Terminals (HI Input and LO Input) Measurement Limits ....................................................... 3
Current Input Terminal (I) Measurement Limits ...................................................................................... 3
Sense Terminals (HI Sense and LO Sense) Measurement Limits.............................................................. 4
Measurement Category .........................................................................................................4
2.Quick Start..................................................................................................................5
General Inspection.................................................................................................................5
Dimensions............................................................................................................................5
Foot Stool Adjustment ...........................................................................................................6
Front Panel Overview ............................................................................................................6
Rear Panel Overview..............................................................................................................8
User Interface ........................................................................................................................9
Power On...............................................................................................................................9
Measurement Connections .................................................................................................. 10
Data Record Function .......................................................................................................... 11
Manual Record ....................................................................................................................................... 11
Auto Record............................................................................................................................................ 12
Troubleshooting .................................................................................................................. 13
3.Appendix...................................................................................................................14
Appendix A: Enclosure ......................................................................................................... 14
Appendix B: General Care and Cleaning ............................................................................... 14
Appendix C: Line Fuse Replacement..................................................................................... 15

1.Safety Information
1
1. Safety Information
Safety Terms and Symbols
Safety Terms
Terms in this Manual. The following terms may appear in this manual:
Warning: Warning indicates the conditions or practices that could result in
injury or loss of life.
Caution: Caution indicates the conditions or practices that could result in
damage to this product or other property.
Terms on the Product. The following terms may appear on this product:
Danger: It indicates an injury or hazard may immediately happen.
Warning: It indicates an injury or hazard may be accessible potentially.
Caution: It indicates a potential damage to the instrument or other property might occur.
Safety Symbols
Symbols on the Product. The following symbol may appear on the product:
Direct current (DC)
Warning, risk of electric shock
Alternating current (AC)
Caution, risk of danger (refer to this
manual for specific Warning or
Caution information)
Both direct and
alternating current
Conforms to European Union
directives
Ground terminal
Chassis Ground
IEC Measurement Category I. The maximum measurable
voltage is 1000 Vpk in the HI -LO terminal.
IEC Measurement Category II. Inputs may be connected to AC
mains power (up to 600 VAC) under Category II overvoltage
conditions.
This product complies with the WEEE Directive (2012/19/EC)
marking equipment. The affixed product label indicates that
you must not discard this electrical/electronic product in
domestic household waste.

1.Safety Information
2
General Safety Requirements
Before any operations, please read the following safety precautions to avoid any
possible bodily injury and prevent this product or any other products connected from
damage. In order to avoid any contingent danger, this product is only used within the
range specified.
Use Proper Power Cord. Use only the power cord supplied with the product and
certified to use in your country.
Product Grounded. This instrument is grounded through the power cord grounding
conductor. To avoid electric shock, the grounding conductor must be grounded. The
product must be grounded properly before any connection with its input or output
terminal.
Limit operation to the specified measurement category, voltage, or amperage
ratings.
Check all Terminal Ratings. To avoid instrument damage and the risk of electric shock,
check all the Measurement Limits and markers of this product. Refer to the user's
manual for the Measurement Limits before connecting to the instrument. Do not
exceed any of the Measurement Limits defined in the following section.
Do not operate without covers. Do not operate the instrument with covers or panels
removed.
Use Proper Fuse. Use only the specified type and rating fuse for this instrument.
Avoid exposed circuit. Do not touch exposed junctions and components when the
instrument is powered.
Do not operate if in any doubt. If you suspect damage occurs to the instrument,
have it inspected by qualified service personnel before further operations.
Use your instrument in a well-ventilated area. Inadequate ventilation may cause
increasing of temperature or damages to the device. Please keep well ventilated and
inspect the intake regularly.
Do not operate in wet conditions. In order to avoid short circuiting to the interior of
the device or electric shock, please do not operate in a humid environment.
Do not operate in an explosive atmosphere.
Keep product surfaces clean and dry.
Only the qualified technicians can implement the maintenance.

1.Safety Information
3
Measurement Limits
The protection circuitry of the multimeter can prevent damage to the instrument and
protect against the danger of electric shock, when the Measurement Limits are not
exceeded. To ensure safe operation of the instrument, do not exceed the Measurement
Limits shown on the front panel, it is defined as follows:
The user-replaceable 10 A current-protection fuse is on the front panel. To maintain
protection, replace fuse only with fuse of the specified type and rating. About the
specified type and rating of the fuse, please refer to "7 Current Terminal Fuse" in "Front
Panel Overview" on page 7.
Main Input Terminals (HI Input and LO Input) Measurement Limits
The HI and LO input terminals are used for voltage, resistance, continuity, frequency
(period), capacitance, diode, and temperature test measurements. Two Measurement
Limits are defined for these terminals:
HI Input to LO Input Measurement Limit
The Measurement Limit from HI Input to LO Input is 1000 VDC or 750 VAC, which is
also the maximum voltage measurement. This limit can also be expressed as 1000
Vpk maximum.
LO Input to Ground Measurement Limit
The LO input terminal can safely "float" a maximum of 500 Vpk relative to ground,
where ground is defined as the Protective Earth Conductor in the AC mains power
cord connected to the instrument.
As implied by the above limits, the Measurement Limit for the HI input terminal is a
maximum of 1500 Vpk relative to ground when LO Input is at its maximum of 500 Vpk
relative to ground.
Current Input Terminal (I) Measurement Limits
The Measurement Limit from the current input terminal (I) to the LO Input terminal is 10
A (DC or AC). Note that the current input terminals will always be at approximately the

1.Safety Information
4
same voltage as the LO Input terminal, unless a current protection fuse is open.
Sense Terminals (HI Sense and LO Sense) Measurement Limits
The HI and LO sense terminals are used for four-wire resistance measurements.
The Measurement Limit from HI Sense to LO Input is 200 Vpk.
The Measurement Limit from HI Sense to LO Sense is 200 Vpk.
The Measurement Limit from LO Sense to LO Input is 2 Vpk.
Note: The 200 Vpk limit on the sense terminals is the Measurement Limit. Operational
voltages in resistance measurements are much lower – up to ± 3 V in normal operation.
Measurement Category
The safety rating of the multimeter:
1000 V, CAT I
IEC Measurement Category I. The maximum measurable voltage is 1000 Vpk in the HI -LO
terminal.
600 V, CAT II
IEC Measurement Category II. Inputs may be connected to AC mains power (up to 600
VAC) under Category II overvoltage conditions.
Measurement category definition
Measurement CAT I applies to measurements performed on circuits not directly
connected to the AC mains. Examples are measurements on circuits not derived from the
AC mains and specially protected (internal) mains- derived circuits.
Measurement CAT II applies to protect against transients from energy-consuming
equipment supplied from the fixed installation, such as TVs, PCs, portable tools, and
other household circuits.
Measurement CAT III applies to protect against transients in equipment in fixed
equipment installations, such as distribution panels, feeders and short branch circuits,
and lighting systems in large buildings.
Measurement CAT IV applies to measurements performed at the source of the low-
voltage installation. Examples are electricity meters and measurements on primary over
current protection devices and ripple control units.

2.Quick Start
5
2. Quick Start
General Inspection
After you get a new multimeter, it is recommended that you should make a check on the
instrument according to the following steps:
1. Check whether there is any damage caused by transportation.
If it is found that the packaging carton or the foamed plastic protection cushion has
suffered serious damage, do not throw it away first till the complete device and its
accessories succeed in the electrical and mechanical property tests.
2. Check the Accessories
The supplied accessories have been already described in the Appendix A: Enclosure
of this Manual. You can check whether there is any loss of accessories with reference
to this description. If it is found that there is any accessory lost or damaged, please
get in touch with our distributor responsible for this service or our local offices.
3. Check the Complete Instrument
If it is found that there is damage to the appearance of the instrument, or the
instrument cannot work normally, or fails in the performance test, please get in
touch with our distributor responsible for this business or our local offices. If there is
damage to the instrument caused by the transportation, please keep the package.
With the transportation department or our distributor responsible for this business
informed about it, a repairing or replacement of the instrument will be arranged by
us.
Dimensions
235 mm
110 mm

2.Quick Start
6
295 mm
Foot Stool Adjustment
Unfold the foot stool on the bottom of the multimeter.
Front Panel Overview
2
3
45
12
1
6
78
11
910
Figure 2-1 Front panel overview
Item
Name
Description
1
LCD
Display the user interface
2
Menu selection
Keys
Activate the corresponding menu
3
Operation Keys
Save
Collect data in manual record. The instrument saves
current reading each time the Save key is pressed. See
page 11,
Manual Record
.

2.Quick Start
7
Record
Access menus of manual record and auto record.
See page 11, Data Record Function.
Run/Stop
Start or stop auto trigger. When the trigger is stopped, the
displayed data will be held.
Math
Perform math operations (Max/Min, dB/dBm) on the
measurement results.
Utility
Set the auxiliary system function, including Language,
Backlight, Clock, Default.
Port
Set Serial port.
4
HI and LO Sense
Terminals
Signal input terminals, used for four-wire resistance
measurements.
5
HI and LO Input
Terminals
Signal input terminals, used for voltage, resistance,
continuity, frequency (period), capacitance, diode, and
temperature test measurements.
6
Range/Direction Keys
When the Range softkey is shown on the right menu, you
can press the key to switch between auto and
manual range. Press to enable manual range, and
increase or decrease the measurement range.
When setting a parameter, press to move the cursor,
press to increase or decrease the value.
7
Current Terminal
Fuse
The rating is 10 A, 250 VAC.
To replace the fuse:
Turn off the multimeter and remove the power cord. Use a
flat-blade screw driver to turn the fuse holder
counter-clockwise, and pull out the fuse holder. Put the
new specified fuse into the fuse holder, and insert the
assembly back into the instrument, turning the fuse holder
clockwise to lock it in place.
8
AC/DC Current Input
Terminals
Signal input terminals, used for AC/DC current
measurements.
9
Power button
Turn on/off the multimeter.

2.Quick Start
8
10
Measurement
Function Keys DC or AC voltage measurements
DC or AC current measurements
Resistance, continuity, and diode measurements
Capacitance measurements
Frequency/Period measurements
Temperature measurements
11
Dual
Press this key to display the function list on the right menu,
select a function, if the function is supported, the reading
will be displayed in the Vice Display.
12
Dual Exit
Press the key to exit dual display mode.
Rear Panel Overview
1
3
2
54
Figure 2-2 Rear panel overview
Item
Name
Description
1
RS232
Connect the PC through this port.
2
Line Fuse
The fuse rating is 250 V, F1AL. To replace the fuse, see page
15, Appendix C: Line Fuse Replacement.
3
AC Mains Input
AC mains input connector.
4
Chassis Ground
Screw
To ground the chassis.
5
Instrument Cable
Lock
You can lock the instrument to a fixed location using the
security lock (please buy it yourself) to secure the
instrument.

2.Quick Start
9
User Interface
Trigger Mode
Reading
Range Function
Operation Menus
Unit
Status Icon
Figure 2-3 User interface
Secondary function
Primary function reading
Primary function
Figure 2-4 User interface (Dual display)
Power On
(1) Connect the instrument to the 90 - 240 V AC supply using the supplied power cord.
Warning:
To avoid electric shock, the instrument must be grounded properly.
(2) Press down the power button at the front panel, the screen shows the progress bar,
and then the user interface will be displayed.
Trigger Mode
Status Icon
Display
Description
Trigger Auto trigger
Icon
Description
Auto record function is running
Manual record

2.Quick Start
10
Measurement Connections
After selecting the desired measurement function, please connect the signal (device)
under test to the multimeter according to the method below. To avoid instrument
damage, do not discretionarily switch the measurement function when measuring.
DC Voltage Measurement
DC Voltage
AC Voltage Measurement
AC Voltage
DC Current Measurement
DC Current
AC Current Measurement
AC Current
2-wire Resistance Measurement
I
2-wire Resistance
4-wire Resistance Measurement
I
4-wire Resistance
Continuity Test
Open or Closed Circuit
I
Diode Measurement
Forward Bias
I

2.Quick Start
11
Capacitance Measurement
Capacitance
Frequency/Period Measurement
AC Signal
Temperature Measurement
Temp Transducer
I
Data Record Function
Data record function includes manual record and auto record. You can use any or both
functions to record the data. The readings recorded in manual record or auto record will
be saved into a same data table in the internal memory. The maximum number of
readings is 1000. Once you have finished collecting data, you can view it in data table,
and export it to a computer via RS232 port.
Manual record: Press the front panel key to save current reading to the data
table of the internal memory.
Auto record: After setting number of points, sample interval, press the Start softkey to
start recording. After recording, you can view the data saved in the data table of the
internal memory.
Manual Record
1. Collect data: The instrument saves current reading in the data table of the internal
memory each time the front panel key is pressed. The icon will show
up on the top of the display.
Note:
The measurement function can be switched during manual record.
When the dual display is enabled, only the reading of main display function can be
saved.
2. View the manual record: Press the front panel key, press the Manual softkey
to display the data table. Press keys to turn the page. (When the data table is

2.Quick Start
12
shown, you can still save current reading by pressing the key.)
Note:
When the recording data exceeds the current range,the data will be marked as
"overload".
When the relative operation is turned on, the recorded data will still be the original
readings without relative operation.
3. Clear the manual record: Press the Clear softkey to clear current manual record.
(Note: The auto record data will also be cleared, since they share the same data
table.)
Auto Record
1. Configure the parameters: Press the front panel key, press the Auto softkey.
Press the Point softkey to specify the total number of readings to record. The range is
1 to 1000.
Press the Interval softkey to specify the time interval between readings. The range is
15 ms to 9999.999 s.
2. Record data: Press the Start softkey to start auto record. The icon will show up
on the top of the display. Press the End softkey to stop recording, the recorded
readings will be displayed in the data table. Press keys to turn the page.
Note:
The measurement function can be switched during auto record.
In auto range, the relay switch may cause jitter, the data at this time is invalid. It

2.Quick Start
13
will last about a few hundred milliseconds, and the data acquired in this period will
be marked as "invalid".
When the dual display is enabled, only the reading of main display function can be
saved.
Troubleshooting
1. The instrument is powered on but no Display.
1) Check if the power is connected properly.
2) Check if the line fuse which is below the AC Mains Input is used appropriately and
in good condition (see page 15, Appendix C: Line Fuse Replacement).
3) Restart the instrument after the steps above.
4) If the problem still exists, please contact us for our service.
2. The reading does not change when a current signal is input.
1) Check whether the test lead is correctly inserted into the current input terminals
(I terminal and LO Input terminal).
2) Check whether the current terminal fuse at the front panel is burned out.
Please refer to "7 Current Terminal Fuse" in "Front panel overview" on page 7.
3) Check whether the DCI or ACI measurement function is enabled.
4) Check whether the DCI measurement function is used to measure AC current.
If you encounter other problems, try to reset the settings or restart the instrument. If it
still cannot work properly, please contact us for our service, and provide your device
information (press the front panel key to view it).

3.Appendix
14
3. Appendix
Appendix A: Enclosure
Standard Accessories (subject to final delivery):
Power Cord Quick Guide Spare Fuses Test Leads
Crocodile Clips
Safety Hintsheet
Software CD
Appendix B: General Care and Cleaning
General Care
Do not store or leave the instrument where the liquid crystal display will be exposed
to direct sunlight for long periods of time.
Cleaning
To clean the instrument exterior, perform the following steps:
1. To prevent electrical shock, disconnect the instrument from AC mains power
and disconnect all test leads before cleaning.
2. Clean the outside of the instrument using a wet soft cloth not dripping water. Do
not make any scuffing when cleaning the LCD screen. To avoid damage to the
instrument, do not use any corrosive chemical cleaning agent.
Caution: To avoid any damage to the instrument, do not exposed it to any sprays,
liquids, or solvents.
Warn
ing: Before power on again for operation, it is required to confirm that
the instrument has already been dried completely, avoiding any
electrical short circuit or bodily injury resulting from the moisture.

3.Appendix
15
Appendix C: Line Fuse Replacement
The line fuse is in the plastic fuse box below the power line input on the rear panel.
Warning: Disconnect the line cord at the rear panel and remove all test leads
connected to the instrument before replacing the line fuse. Failure
to do so could expose the operator to hazardous voltages that could
result in personal injury or death.
Use only the correct fuse type. Failure to do so could result in personal injury or
instrument damage.
Voltage Fuse
90 - 240VAC
250 V, F1AL
To perform the line fuse replacement, follow these steps:
1. Turn off the multimeter, remove all measurement leads and other cables from the
instrument, including the power cord.
2. Use a flat-blade screwdriver to remove the fuse box.
3. Replace the fuse with a new one, which should match with the rating; install it into
the fuse box, and push the fuse box back on to the rear panel.
2019.09 V1.0.0