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Frequency measurement 

Turn the switch knob to Hz range. Insert one end of the red pen into the jack of 
“V/

/mA /Hz/CAP” and one end of the black pen into the jack of “COM”. 

Connect the other end of the two pens in parallel to the to-be-tested circuit and 
read the frequency value. 
Sensitivity of the frequency range is approx. 2V RMS. 
Attention:  

1. In an environment with strong noise, it is better to use shielded cable when 

perform small single measurement. 
 2. When the frequency amplitude under test is larger than 50V, please press 
“SELECT” key in the “ACV” range to enter frequency function, and then make 
the measurement. When high voltage frequency is measured in this method, the 
meter can bear voltage with a peak value up to 1000V, which can prevent the 
meter from being damaged when the voltage amplitude is too high. The meter 
can automatically attenuate the voltage under test to an optimal amplitude value 
that ICs can handle and has good antijamming ability. 

Auto power off 

the meter is turned off automatically in approx. 15 minutes After it is turned on 
if no key is pressed and the rang switch knob is not operated. 

Attention:

 To lengthen service life of the battery, please turn the power off after 

use it. 

 

4

VI. Calibrate the meter   
   Special attention: Do not enter calibration mode before read the 
operating instructions. Otherwise, calibration data stored in the meter 
might be lost and normal measurement can be performed with the meter. 
I) Key functions of the meter panel in calibration mode: 

1-1, Gently touch “DH/BL” key, the buzzer makes a short sound. Here, press 

“TEST/STOP” key several times to adjust the display value up; press 
“SELECT” key several times to adjust the display value down. Gently 
touch “DH/BL” key again, the buzzer makes a long sound. Press 
“SELECT” key or “TEST/STOP”key to restore the initial function. Press 
and hold “DH/BL” key until the buzzer makes two sounds and the current 
adjusted result is saved. In calibration mode, “DH/BL” key has no data 
hold and backlight control function. 

1-2, “TEST/STOP” key: it is high voltage switch or used to adjust display 
value up, depending on “DH/BL” key. 
1-3, “SELECT” key: it is function switch or used to adjust display value 

down, depending on “DH/BL” key. 

II) Three calibration methods are available for the meter: 

    2-1 Calibrate all ranges of the function. Each range has a standard calibration 
point.  
Except that DC1000V and AC700V range are at “500V” point, all other ranges 

are at “1000” point (for example, 10.00uF point). Select any point, and all 
ranges of the function will be calibrated. 

2-2, The range can be calibrated at any range of any function. Operation result 

only affects the present range, the same as in 2-1. Attention: The two 
methods above mentioned are only applicable to advanced users. 

2-3, The range can be calibrated at any point of any range of any function. 
Even if the user doesn’t have signal source that outputs standard points 
required by the meter, the user can monitor the input value of the 
to-be-calibrated meter with the monitoring meter, as long as the use has a 
monitoring meter over Level 0.2. Use keys on the panel of the to-be-calibrate 
meter to adjust the meter until the displayed value of the meter under 
calibration is the same as that of the monitoring meter. 

III) Select and enter an adjustment mode according to requirements – three 
methods are available:

 

3-1

 

Turn the switch knob to “OFF” position. Press and hold DH key and then 
turn the switch knob to the to-be-adjusted range. Release DH key after you 
hear “di”- “di” sounds. Here, the meter enters 2-3 calibration mode. 

3-2

 

Turn the switch knob to “OFF” position. Press and hold DH key and 
“SELECT” simultaneously and then turn the switch knob to the 
to-be-adjusted range. Release the keys after you hear “di”- “di” sound. 
Here, the meter enters 2-2 calibration mode. 

3-3

 

Turn the switch knob to “OFF” position. Press and hold DH key and 
“TEST/STOP” key simultaneously and then turn the switch knob to the 
to-be-adjusted range. Release the keys after you hear “di” -“di” sound. 
Here, the meter enters 2-1 calibration mode. 

IV) Examples of calibration: 

4-1 Use Method 2-3 to calibrate AC current range: Insert one end of the red pen 

into the jack of “V/

/mA” and connect the other end to positive output 

terminal of the calibration source. Insert one end of the black pen into the 
jack of “COM” and connect the other end to negative output terminal of the 
calibration source. When enter calibration mode, turn the switch knob to 
“mA” range. Press “SELECT” key to select AC current measurement mode. 
Gently tough “DH/BL” key and the meter makes a short sound. Here, 
“TEST/STOP” key and “SELECT” key can be used to adjust display value 
of the to-be-calibrated meter. When the calibration output current is AC 
10mA, adjust display of the calibrated meter to “10.00”. Press and hold 
“DH/BL” key until you hear “di”-“di” sound. AC 10mA range is calibrated. 
If use Method 2-3 to calibrate AC 100mA range, just need to increase the 
calibration current to 100mA. The meter automatically switches to AC 
100mA range.    Adjust display of the calibrated meter to “100.0”. Then, 
press and hold “DH/BL” key until you hear “di”-“di” sound. 

4-2 The voltage output of high voltage generator of the mega-ohm range is set up 

in the factory and adjusted through resistance, but not through software

 

4-3 Use Method 2-1 to adjust measurement voltage of mega-ohm range: Insert 

one end of the test pen of the with high voltage test bar into L terminal 
socket of the meter. Insert one end of the red pen into the jack of “L” and 
connect the other end to negative output terminal of the calibration source. 
Insert one end of the black pen into the jack of “COM” and connect the other 
end to positive output terminal of the calibration source (the red is negative 
and the black is positive. Do not make mistake. Otherwise, the internal 
circuit would burn

!!

). When enter calibration mode, turn the switch knob 

to 1000V or 2500V voltage range for mega-ohm measurement. Without 
turning high voltage in the to-be-calibrated meter, calibration source outputs 
DC 1000V voltage. Positive voltage is applied to “COM” input terminal of 
the to-be-calibrated meter, and negative voltage is applied to its “L” terminal. 
After the display is stable, press and hold “DH/BL” key. 

4-4

 

Use Method 2-1 to calibrate resistance value of the mega-ohm range: Insert 
one end of the test pen with high voltage test bar into L terminal socket of 
the meter. Insert one end of the test cable with test clamp into “E” terminal 
socket of the meter. Insert one end of the test cable with black test pen (the 
pen with a clamp) into of G terminal socket of the meter. Set output 
resistance of the resistance box to 100 mega-ohms. Press “SELECT” key to 
select one minute for the timer. Turn on high voltage of the to-be-calibrated 
meter and output high voltage value is displayed in voltage meter of the 
mage-ohm meter. After the display of the meter under calibration is stable, 
press and hold “DH/BL” key. After the buzzer makes two sounds, all 
mega-ohm ranges under the measurement voltage are calibrated (Attention: 
in calibration mode, do not press “DH/BL” key when the high voltage is not 
turned on. Otherwise, high voltage calibration value would be lost). 

4-5

 

No calibration is needed for the frequency range. DC4V range is will be 
referenced automatically for diode range when DC4V range is calibrated. 
400

 resistance range will be referenced automatically for ON-OFF range 

when 400

 resistance range is calibrated. 

4-6

 

After calibration of various ranges is completed, it is necessary to turn the 

meter off and restart it before the adjusted values take effect. 

  Special attention: the user who doesn’t have calibration conditions 

should not make the calibration. 
VII

Maintenance of the meter 

Warning

  It is necessary to turn the power off and disconnect test 

pens before open the case of the meter or battery cover to prevent 
danger of electric shock. 

1. When the sign “

- +

” is displayed in the meter, the battery needs to be 

changed. Open the battery cover, and replace the old battery with a new 
one of the same type to ensure the meter works normally. 

2. To protect internal circuit of the meter, it is necessary to replace the fuse with 
one of the same specifications when the fuse in current range is burned. 
Specifications of the fuse used in the series meters is: F 500mA/250V(fast). Be 
sure to turn the switch knob to OFF position before open the bottom cover to 
prevent high-voltage electric shock. 
3. Keep the meter and the test pens clean, dry, and undamaged. Use a clean cloth 

or eradicator to clean the case of the meter. Do not use abrasive or organic 
solvent. 

4. Avoid mechanical damage, shock, and impact; avoid exposure to high 

temperature and strong magnetic field. 

VIII. Accessories 

1. Test cable: one set, including one red high voltage test pen, one black test pen, 

one black test cable (with a clamp), and one test clamp. 

2. Operating instructions: one copy   
3. Conformity certificate/Warranty card: one piece 

 

Please visit 

www.multimeterwarehouse.com

 to see the update and more. All the 

specifications are subject change without previous notes. 

Tel: 909 628 6088,Fax: 909 628 7999, email: [email protected] 

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