Global Specialties PRO-50A User manual

Handheld Digital
Multimeter
PRO-50A

globalspecialties.com 1
Safety Summary
A WARNING statement calls attention to an operating procedure,
practice, or condition, which, if not followed correctly, could result in
injury or death to personnel.
A CAUTION statement calls attention to an operating procedure,
practice, or condition, which, if not followed correctly, could result in
damage to or destruction of parts or the entire product.
To avoid possible electric shock or personal injury, follow these
guidelines:
zUse the meter only as specified in this manual or the
protection provided by the meter might be impaired.
zDo not use the meter or test leads if they appear damaged, or
if the meter is not operating properly.
zAlways use proper terminals, switch position, and range for
measurements.
zTest the meter’s operation on a known voltage before using it
in general. If in doubt, have the meter serviced.
zDo not apply more than the rated voltage, as marked on the
meter, between terminals or between any terminal and earth
ground.
zDisconnect circuit power and discharge all high-voltage
capacitors before testing resistance, continuity, diodes, or
capacitances.
zDo not use the meter around explosive gas or vapor.
zWhen using test leads or probes, keep your fingers behind
the finger guards.
zOnly use test leads and accessories that have the same
voltage, category, and amperage ratings as the meter and
that have been approved by a safety agency.
zDisconnect the test leads from the meter before removing the
battery cover or meter case.
zComply with local and national safety requirements when
working in hazardous locations.
zUse proper protective equipment, as required by local or
national authorities, when working in hazardous areas.
zAvoid working alone.

globalspecialties.com 2
zCheck the test leads for continuity before use. Do not use if
the readings are high or noisy.
zDo not install substitute parts or perform any unauthorized
modifications to this instrument. Return the instrument to Cal
Test Electronics for service and repair to ensure that safety
features are maintained.
zIf the meter is used near noise generating equipment, be
aware that the display may become unstable or indicate large
errors.
zNever ground yourself when taking electrical measurements
zUsing this meter in an environment with a strong radiated
radio-frequency electromagnetic eld (approx. 3 V/m), may
negatively affect the measuring accuracy.
Compliance Statements
Disposal of Old Electrical & Electronic Equipment
(Applicable in the European Union and other European countries
with separate collection systems). This product is subject to
Directive 2012/19/EU of the European Parliament and the
Council of the European Union on waste electrical and
electronic equipment (WEEE), and in jurisdictions
adopting that Directive, is marked as being put on the
market after August 13, 2005, and should not be disposed
of as unsorted municipal waste. Please utilize your local
WEEE collection facilities in the disposition of this product
and otherwise observe all applicable requirements.
The PRO-50A is CE compliant
CE Declaration of Conformity
The power supply meets the requirements of 2006/95/EC Low
Voltage Directive and 2004/108/EC Electromagnetic Compatibility
Directive with the following standards.

globalspecialties.com 3
zLow Voltage Directive: EN61010-1. Safety requirements for
electrical equipment for measurement, control, and laboratory
use-Part 1: General requirements
zEMC Directive: EN 61326-1:2006
Operating Environment
This meter meets IEC 61010-1 2nd Edition standards which dene
four measurement categories:
CAT I
Measurement instruments whose measurement inputs are not intended to be
connected to the mains supply. The voltages in the environment are typically
derived from a limited-energy transformer or a battery.
CAT II Measurement instruments whose measurement inputs are meant to be connected
to the mains supply at a standard wall outlet or similar sources.
CAT III Measurement instruments whose measurement inputs are meant to be connected
to the mains installation of a building.
CAT IV Measurement instruments whose measurement inputs are meant to be connected
to the source of power for a given building.
The instrument may be operated in the following environment:
Measurement Category CAT III, 1000 V
CAT IV, 600 V
Operating Environment 0 °C to 40°C
Storage Humidity 0 – 85% R.H.
Storage Environment -20 °C to +70°C
Pollution Degree Pollution Degree 2

globalspecialties.com 4
Table of Contents Page
1 General Information ................................................5
1. Product Overview......................................................................5
2. Features...................................................................................5
2 Package Contents.....................................................5
3 Product Description..................................................6
1. Front Panel...............................................................................6
2. Display Diagram........................................................................7
4 Using the Digital Multimeter ....................................8
1. DC and AC Voltage Measurements..............................................8
2. DC and AC Current Measurements..............................................9
3. Resistance Measurements........................................................11
4. Diode Measurements...............................................................12
5. Continuity Test........................................................................13
6. Capacitance Measurements......................................................14
7. Transistor Gain Measurements .................................................15
8. Temperature Measurements.....................................................15
9. Frequency Measurements ........................................................16
10. Auto Power-Off.......................................................................16
11. Data Hold Mode......................................................................17
12. Non-Contact AC Voltage Detection ...........................................17
5 Specications .........................................................17
1. General Specications .............................................................17
2. Measurement Specications .....................................................18
6 Maintenance...........................................................21
1. Cleaning.................................................................................21
2. Battery and Fuse Replacement.................................................21
3. Warranty ................................................................................22
4. Calibration and Repair .............................................................22

globalspecialties.com 5
1 General Information
1. Product Overview
The Global Specialties PRO-50A Handheld Digital Multimeter
provides standard measurement functions, which include AC and
DC voltage, AC and DC current, resistance, capacitance, diode, and
continuity.
2. Features
z3½ Digit display resolution
zDC Voltage measurement up to 1000 V
zAC Voltage measurement up to 750 V
zAC and DC Current up to 10 A
zFrequency measurements
zTemperature measurements
2 Package Contents
Please inspect the instrument mechanically and electrically upon
receiving it. Unpack all items from the shipping carton, and check
for any obvious signs of physical damage that may have occurred
during transportation. Report any damage to the shipping agent
immediately. Save the original packing carton for possible future
reshipment. The package includes the following:
zPRO-50A handheld digital multimeter
z1x User manual
z1x Test leads
z1x “K” type bead thermocouple
z1x Special multi-function socket

globalspecialties.com 6
3 Product Description
1. Front Panel
1
2
3
4 5
6
7
8
9
1011
Figure 1. Front Panel Diagram

globalspecialties.com 7
Front Panel Description
1. Display: Displays the measured values, selected function mode, and annunciators.
2. Power Button: Turns the meter on or off.
3. 10 A: The positive input terminal for up to 10 A current measurement.
4. mAhFE, TEMP : The positive input terminal for up to 400 mA, as well as for capacitive
and temperature measurements.
5. COM: The negative (ground) input terminal for all measurement modes. Connection is
made to it using the black test lead.
6. VΩHz : The positive input terminal for voltage, ohms, frequency and diode
measurements. Connection is made using the red test lead.
7. Function/Range Rotary Switch: Selects the function and desired range.
8. Backlight: Press to activate LCD backlight.
9. HOLD: Displays the current value on the display even if the leads are removed from device
under test. Pressing the button again returns to current reading measurement mode.
10. AC Voltage Sensor: Sensor for non-contact AC voltage detection.
11. AC Voltage Indicator: Indicator LED for AC voltage ≥110 Vrms.
2. Display Diagram
1 2 3 4 5 6
7
8
9
10
11
12
Figure 2. Display Diagram

globalspecialties.com 8
Display Description
1. Indicates use of the highest voltage settings
2. The meter is in data hold mode
3. The meter is in diode test mode
4. The meter is in continuity check mode
5. The meter is in transistor gain mode
6. The meter is in temperature mode
7. Units of measure
8. Indicates range
9. Low battery indicator. WARNING. To avoid false readings which could lead to electric shock
or instrument damage, change the battery as soon as this indicator appears.
10. Alternating current
11. Indicates negative value
12. Direct current
4 Using the Digital Multimeter
With no signal present, set the rotary switch to the desired
measurement function. Ensure proper insertion of the test leads so
they correspond with the type of measurement you wish to perform.
When connecting the test leads to the circuit or device, connect the
COM test lead (black) before connecting the live lead (red). When
removing the test leads, remove the live lead rst.
WARNING
To avoid electric shock, injury, or damage to the meter, disconnect
circuit power and discharge all high-voltage capacitors before
testing resistance, continuity, diodes, or capacitance.
CAUTION:
Always connect the test leads to the meter’s inputs rst before
connecting the DUT to avoid potential shock hazard.
1. DC and AC Voltage Measurements
The meter’s DC voltage ranges, , are 200 mV, 2 V, 20 V, 200 V,
and 1000 V. The AC voltages ranges, , are 2 V, 20 V, 200 V, and
750 V. Turn the rotary switch to the corresponding symbol for the

globalspecialties.com 9
measurement you would like to perform.
Follow these steps to make a measurement:
1. Connect the negative (-) side with the black test lead to
the COM input.
2. Connect the positive (+) side with the red test lead to the
VΩHz input.
3. Probe with the test leads to the DUT and record the
measured reading on the display.
10A COMmAhFE
TEMP VΩHz
Figure 3. Connection for AC or DC Voltage Measurement
2. DC and AC Current Measurements
WARNING
To avoid personal injury or damage to the meter:
zNever attempt to make in in-circuit current measurement
when the open-circuit potential to earth is >600 V.
zCheck the meter’s fuse before testing.
zUse the proper terminals, switch position, and range for your
measurement.
zNever place the probes in parallel with a circuit or component
when the leads are plugged into the current terminals.
The meter’s DC current ranges, , are 20 mA, 200 mA, and 10
A. The meter’s AC current ranges, , are 20 mA, 200 mA, and 10
A. Turn the rotary switch to the corresponding symbol for the
measurement you would like to perform.
Follow these steps to make a measurement: