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Introduction 
 

Congratulations on purchasing the MFJ-854 RF-Current Meter.  The MFJ-854 is 
designed for measuring current distribution on antenna elements and radials, and for 
checking common-mode current levels on coaxial feedlines and grounds.  It also works 
well for tracking down RFI-causing current on household wiring and cables.  Here are 
some important features we think you'll like: 
 

Wide Range:  

Measures RF current from as little as 1 mA to 3 Amps in six ranges. 

Full HF Coverage:  

Accurate from 1 MHz to 30 MHz and beyond.

 

Low Interaction:  

Sense coil has minimal effect on circuits under test.

 

Large Cable Capacity:  

Accepts cables up to approximately 1/2" in diameter. 

 

Accurate:

  Diode-compensated Op-Amp delivers improved meter linearity. 

Rugged: 

 Built to last with a sturdy all-aluminum case and G-10 pc board.   

Battery Saver: 

Press-to-test power circuit turns unit off automatically after 15 seconds.

 

Long Battery Life:  

Meter draws 3-mA, battery's service life approaches shelf life.

 

Handheld Size:  

Weighs 11 ounces, only 2.3" x 1.6" x 6.5" (including sense coil). 

 
 

Controls and Locations 
 

                        

Sensitivity

Power

On

<30mA

Adj

30mA

100mA 300mA

1A

3A

Ampres

2

3

4

5

MFJ-854

Cable

1

6

9-V

 

 
1. Sense Coil:

  Clamps onto conductor under test, accepts diameters to around 1/2" . 

2. Meter:  

Calibrated scale indicates readings in mA or Amps. 

3. Range:

  Selects from six measurement ranges. 

4. Sensitivity:  

Works on <30 mA range, adjusts gain for low-level measurements.

 

 

  

5. Power On:  

Momentary switch applies power, activates 15-second power-off delay. 

 

6. Battery Clip:  

Accepts any standard 9-V

 

flat-pack battery. 

 

 

Содержание MFJ-854

Страница 1: ...ode compensated Op Amp delivers improved meter linearity Rugged Built to last with a sturdy all aluminum case and G 10 pc board Battery Saver Press to test power circuit turns unit off automatically after 15 seconds Long Battery Life Meter draws 3 mA battery s service life approaches shelf life Handheld Size Weighs 11 ounces only 2 3 x 1 6 x 6 5 including sense coil Controls and Locations Sensitiv...

Страница 2: ...n the wire or cable inside the core opening Close the lid over the cable pressing down until latch clicks shut 1 2 3 Click Lift Press Unlatch Meter The meter is scaled from 0 to 100 On the 100 mA range readout is direct 100 100 mA On the 1 A range move the decimal point 2 places to the left 100 1 00 A To convert meter readings made on the 30 mA 300 mA and 3 A ranges multiply accordingly For exampl...

Страница 3: ... normal Power Switch Power is applied via a press to test momentary contact switch A built in hold circuit keeps the unit powered for approximately 15 20 seconds after the switch is released This feature permits hands off measurement on energized conductors RF Hazard Important Warnings 1 RF current measurements must be conducted with extreme caution Physical contact with conductors carrying even m...

Страница 4: ... problem always check battery condition first If battery replacement fails to resolve the problem you may contact MFJ Customer Service by phone at 601 323 5869 or reach them via E mail at mfj mfjenterprises com Be sure to include a complete description of the difficulty Calibration Instructions To check meter calibration use the test set up shown below HF Transceiver In Line Wattmeter 7 000 MFJ 85...

Страница 5: ...Schematic Parts List ...

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