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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. 

 

 

Summary of Contents for PRO-57

Page 1: ...PRO 57 Tweezer Digital Multimeter OPERATING INSTRUCTIONS...

Page 2: ...easurements 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...

Page 3: ...ond 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...

Page 4: ...0 range Overload protection 30VDC or 30AC RMS CAPACITANCE Ranges 3nF 30nF 300nF 3 F 30 F 300 F 3mF 30mF Resolution 1pF Accuracy 3 0 rdg 10 dgts on 3nF to 300 F ranges 5 0 rdg 20 dgts on 3mF to 30mF ra...

Page 5: ...le warning 0 03V Overload protection 30VDC or 30AC RMS OPERATION Before taking any measurements read the Safety Information section Always examine the instrument for damage contamination excessive dir...

Page 6: ...so 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...

Page 7: ...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 M...

Page 8: ...on 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 capacit...

Page 9: ...y 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 indicat...

Page 10: ...d 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...

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