Global Specialties PRO-57 User manual

PRO-57

Tweezer Digital Multimeter

OPERATING INSTRUCTIONS

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SAFETY INFORMATION

EMC: Conforms to EN61326-1.

The following safety information must be
observed to insure maximum personal safety
during the operation of this meter:

Use the meter only as specified in this manual
or the protection provided by the meter might
be impaired.

Do not use the meter if the meter or test leads
look damaged, or if you suspect that the meter
is not operating properly.

Never ground yourself when taking electrical
measurements. Do not touch exposed metal
pipes, outlets, fixtures, etc., which might be at
ground potential. Keep your body isolated
from ground by using dry clothing, rubber
shoes, rubber mats, or any approved
insulating material.

Turn off power to the circuit under test before
cutting, unsoldering, or breaking the circuit.
Small amounts of current can be dangerous.

When using the probes, keep your fingers
behind the finger guards on the probes.

Measuring voltage which exceeds the limits of
the multimeter may damage the meter and
expose the operator to a shock hazard.
Always recognize the meter voltage limits as
stated on the front of the meter.

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SPECIFICATIONS

Display: 3000 counts.
Polarity: Automatic, ( - ) negative polarity

indication.

Overrange: " OL " mark indication.
Low battery indication:

The " " is displayed when the battery

voltage drops below the operating level.
Measurement rate: 4 times per second,
nominal.

Auto power off: approx. 10 minutes.
Operating environment:

0 to 40 ( 32 104 ) at < 70% R.H.

Storage temperature:

-20 to 60 ( -4 to 140 ) at < 80% R.H.

with battery removed from meter.

Temperature Coefficient:

0.1 x ( specified accuracy ) per . ( 0 to

18, 28 to 40 ).

Power:

CR2032.

3.0V button-type lithium battery x1,

Battery life: 100 hours continuous operation.
Dimensions:

205mm (H) X 40mm (W) X 24.5mm (D).
Weight: Approx. 3.5 oz. ( 100g ) including
battery .

(Accuracy at 23

5 

, <70% R.H.)

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RESISTANCE
Ranges:

300Ω, 3kΩ, 30kΩ, 300kΩ, 3MΩ, 30MΩ

Resolution: 0.1Ω
Accuracy:

 ( 1.0% rdg + 5 dgts ) on 300Ω range
 ( 1.0% rdg + 4 dgts ) on 3kΩ to 300kΩ ranges

 ( 2.0% rdg + 4 dgts ) on 3MΩ range

 ( 5.0% rdg + 5 dgts ) on 30MΩ range

Auto check ranges: 300Ω to 3MΩ ranges
Auto check threshold: >300Ω
Open circuit volts:

-0.45V dc typical, ( -1.2Vdc on 300

Ω

range )

Overload protection: 30VDC or 30AC RMS
CAPACITANCE

Ranges:

3nF, 30nF, 300nF, 3µF, 30µF, 300µF,

3mF,30mF

Resolution: 1pF
Accuracy:

 ( 3.0% rdg + 10 dgts ) on 3nF to 300µF ranges
 ( 5.0% rdg + 20 dgts ) on 3mF to 30mF ranges

Auto check ranges: 3nF to 300µF ranges
Auto check threshold: >500pF
Overload protection: 30VDC or 30AC RMS
When the capacitor to be tested is
connected and the "DIS.C" symbol shows
on the LCD, it means there is voltage
existing in the tested capacitor and needs
to be discharged before testing.

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CONTINUITY
Range: 300Ω

Resolution: 0.1Ω
Audible indication: Less than 30Ω
Response time: 500ms
Overload protection: 30VDC or 30AC RMS

DIODE TEST
Test current: 1.0mA ( approximate )
Accuracy:  ( 3.0% rdg + 3 dgts )
Resolution: 1mV
Open circuit volts: 3.0 dc typical
Auto check threshold:
Audible warning: < 0.03V
Overload protection: 30VDC or 30AC RMS

forward voltage drop <0.8V

OPERATION

Before taking any measurements, read the
Safety Information section. Always examine
the instrument for damage, contamination
(excessive dirt, grease, etc.) and defects.
Examine the test leads for cracked or frayed
insulation. If any abnormal conditions exist do
not attempt to make any measurements.

ON/OFF Switch: Power
Autoranging: The meter defaults to

autorange when you turn it on. In autorange,
the meter selects the range automatically.

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Auto check mode:

1. In the Auto Check mode, " SCAN/ ---- "

appears in the display. The meter
automatically senses the resistance,
continuity, diode test, or capacitance.

2. In the Auto Check mode, the RANGE

button and HOLD button are disabled.

Button:

1. Use the button to select

resistance, continuity, diode test or
capacitance

2. The button also works as an on/off

.

button. Depress the button for
more than 2 seconds to shut down the
meter. Depress the button again
for more than 1 second to wake up the
meter. If the meter is turned off with the

button, it can only be turned on

with this button.

Data Hold Feature

Press [HOLD] button to toggle in and out of
the Data Hold mode.
In the data hold mode, the "HOLD" indicator is
displayed and the last reading is held on the
display.
Press the [HOLD] button again to release the
hold and current readings are once again
displayed.

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Manually Selecting Range

The meter also has a manual range mode. In
manual range, you select and lock the meter
in a range. To manually select a range:
Press [RANGE] button to hold the selected
range. Subsequently pressing the [RANGE]
button will select each range in sequence
from the lowest to highest range. Hold the
button for 2 seconds to return to the
Autorange Mode

.

Measuring Resistance and Testing
Continuity

1. Set the function to " " or " " position.

2. Turn off power to the circuit under test.

External voltage across the components
causes invalid readings.

3. To toggle between the ohms / continuity / diode

modes, press Mode Switch.

4. Touch the probes to the test points. In

ohms, the value indicated in the display is
the measured value of resistance with
proper decimal point and annunciator
indication. In continuity test, the beeper
sounds continuously, if the resistance is
less than approximately 30Ω

.

Testing Diodes

1. Set the Function to " " position.

2. Turn off power to the circuit under test.

External voltage across the components

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causes invalid readings.

3. To toggle between the ohms / continuity / diode

modes. press Mode Switch.

4. Touch probes to the diode. A forward-voltage

drop is about 0.6V ( typical for a silicon diode ).

5. Reverse probes. If the diode is good, "OL"

is displayed. If the diode is shorted, a value
near 0mV will be displayed.

6. If the diode is open, "OL" is displayed in

both directions.

7. Audible Indication: Less than 0.03V.

Capacitance Measurements

1. Set the Function to " " position.

2. Touch the probes to the capacitor. Observe

polarity when measuring polarized capacitors.

3. Read the capacitance directly from the display.

4. Discharge the capacitor before taking

capacitance measurements.

5. When the capacitor to be tested is

connected, if "DIS.C" symbol indicates on
LCD, it means there is voltage existing in
the tested capacitor and need to be
discharged before testing.

6. On the 3nF and 30nF ranges, before

making measurements, note the value on
the display, which is the residual
capacitance of test leads. Subtract the
residual value from the reading to obtain the
correct value of the capacitance
measurement.

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Auto Power off

1. Auto power off: approx. 10 minutes.

2. After auto power off, press (RANGE) button to

restart the meter, and the last reading of
measurement will appear in the display.

Cancellation Of Auto Power Off Feature:

Press and hold the (RANGE) button while moving
slide switch from off to any position to turn on the
meter . The auto power off feature is disabled.
Note “APO” indicator is missing from the LCD.

Cleaning

Wipe the case with a damp cloth and mild
detergent. Do not use abrasives or solvents.
Dirt or moisture in the terminals can affect
readings.

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BATTERY REPLACEMENT

Remove the batteries if the meter not be used
for an extended period of time. Power is
supplied by a 3 volt button-type lithium battery
x1, CR2032. " " appears on the LCD
display when replacement is needed.

1. Set the Function Switch to OFF.

2. Remove battery cover screw.

3. Slide off battery cover and change battery.

4. Replace battery cover and screw.

+

-

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