Laser 5990 Instructions Download Page 3

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Testing DC / AC Current:

1.  Remove  covers  from  test  probe  tips,  insert  black  test  lead  into  COM  socket  (

J

)  and 

red test lead into µAmA Milliamps socket (

H

). If the current to be measured is between 

326mA and 10A, connect the red test lead to the 10A socket (

G

) instead. 

2.  Set the Function / Range rotary switch (

F

) to the µA≈, mA≈, or 10A≈   position, press the 

function/ selection button (

D

) to select DC or AC (DC or AC symbol will be displayed). 

3.  Remove power from the circuit under test, then open up the circuit at the point where you 

intend to measure current.

4.  Connect test leads in series with the circuit.
5.  Apply power to the circuit and read the display.

(

Caution

: Risk of electric shock. 

Do not

 measure AC current on any circuit where voltage 

exceeds 250V AC. Do not make current measurements on the 10A scale for longer than 10 

seconds in 15 minute intervals.
If the magnitude of the current to be measured is unknown, select the highest range and 

then reduce it range by range, until a satisfactory resolution is obtained).

Testing Resistance:

1.  Remove covers from test probe tips, insert black test lead into COM socket (

J

) and red 

test lead into VΩ RPM (Multifunction) socket (

I

).

2.  Set the Function / Range rotary switch (

F

) to the Ω position. The polarity of the red test 

lead is positive. The display shows OL.

3.  Touch the test probes across the circuit or component under test. Components should 

be disconnected from their circuit so that the circuit does not interfere with the resistance 

reading.

(

Caution

: Risk of electric shock. Disconnect power to the unit under test and discharge all 

capacitors before taking any resistance measurements, If applicable, remove any batteries).

Testing a Diode:

1.  Remove covers from test probe tips, insert black test lead into COM socket (

J

) and red 

test lead into VΩ RPM (Multifunction) socket (

I

).

2.  Set the Function / Range rotary switch (

F

) to the Ω position, press the function/ selection 

button (

D

) to display the diode symbol       . The polarity of the red test lead is positive.

3.  Connect the test leads across the diode - red lead to the positive pole (anode) of the 

diode, black to the negative pole (cathode).

4.  Read the forward voltage on the display. The multimeter will show the forward voltage 

drop between the two test leads. If the diode is reversed, the display shows OL. If both 

readings  display OL, the device has gone open circuit.

(

Caution

: Risk of electric shock. Do not test a diode that has voltage on it).

Range

Resolution

Accuracy

3.26V

1mV

+/- (0.8% + 5) (40~200Hz)

32.6V

10mV

+/- (1.2% + 7) (200~400Hz)

250V

0.1V

+/- (1.0% + 5) (40~200Hz)
+/- (1.5% + 7) (200~400Hz)

AC Voltage (autorange):

Input impedance:  

10MΩ

Frequency: 

 

40Hz to 400Hz

Overload protection: 

250V DC/AC

Range

Resolution

Accuracy

326µA

0.1µA

+/- (0.4% + 10)

3260µA

1µA

32.6mA

10µA

+/- (1.2% + 5)

326mA

0.1mA

10A

10mA

+/- (2.0% + 5)

Range

Resolution

Accuracy

326µA

0.1µA

+/- (5% + 10) (40~400Hz)

3260µA

1µA

32.6mA

10µA

+/- (1.5% + 5) (40~200Hz)

326mA

0.1mA

+/- (1.8% + 7) (200~400Hz)

10A

10mA

+/- (3.0% + 7)

DC Current: (µA and mA are autorange):

AC Current: (µA and mA are autorange):

Overload protection: 

10A range: 

Fuse,  10A/250V,  fast  action  (for  inputs  >2A:  measurement  duration 

 

 

<10 seconds per 15 minute interval).

Other ranges: 

Fuse, 500mA/250V fast action.

Overload protection: 

10A range: 

Fuse,  10A/250V,  fast  action  (for  inputs  >2A:  measurement  duration 

 

 

<10 seconds per 15 minute interval).

Other ranges: 

Fuse, 500mA/250V fast action.

Frequency: 

40Hz to 400Hz

Range

Resolution

Accuracy

326Ω

0.1Ω

+/- (1.0% + 8)

3.26kΩ

+/- (1.0% + 5)

32.6kΩ

10Ω

326kΩ

0.1kΩ

3.26MΩ

1kΩ

32.6MΩ

10kΩ

+/- (3.0% + 7)

Resistance (autorange):

Range

Resolution

Accuracy

320Hz

0.1Hz

+/- (2.5% + 5)

3200Hz

1Hz

32kHz

0.01kHz

Frequency (manual range):

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