MFJ Standing Wave Meter Head Radio Power Meter with Backlight SWR Watt Meter

MFJ Standing Wave Meter Head Radio Power Meter with Backlight SWR Watt Meter

1.movable part: movable coil type

2：Outlook：See attached picture for details

 Needle material: zinc white brass

 Needle color: black

3. Direction of needle movement: from left to right

Hand length: 49mm from the end of the needle to the center of the shaft

Hand width: 0.45sh 0.05 mm 

4. Material of upper cover: PMOMA

5. Lower cover material: ABS

6. Magnet material: Alnico sintered magnet

7. Frame material: SPCC

8. Enameled wire material: UEW polyurethane copper wire

9. Iridium placement: vertical

10. Wire: two 200mm # 28 wire, a black, - . Article red. They are used to solder the LED

positive/negative electrode. The wire ends need to have 5mm of copper exposed for soldering purposes.

Backlight

Type 1: Two LEDs in series "6V, 20mA", connected to a resistor, 6200 1/2W

Type 2: Two LEDs in series "6V, 20mA", connected to a resistor, 1.3KQ 1/2W

Standard test conditions: temperature 20C*, humidity 70%. If the test result will not be different, it can also be conducted under normal temperature and humidity.

1.Electricity flux degree

The DC current required from the zero scale to the position shown on the scale.

2. Maximum current level The DC current required from the zero scale to the full scale position.

200uA (8%)

3. Internal DC impedance: 7500 or 8%.

4. Insulation impedance

With 500V DC voltage test its insulation value, Iridium shell and electrical circuit insulation impedance

More than 50MΩ.

5. Friction

Iridium on the sense current, and then slowly reduce to zero, the pointer indication position and the error of the center of the zero scale

1mm

6. Zero position

The standard position of the electric cell, the center of the zero scale as the reference, the deviation between the location of the needle and the center of the zero scale

The deviation between the position of the needle and the center of the zero scale is 1mm.

7. Balance

When the Iridium is tilted 90 degrees relative to the standard position, the deviation between the position of the pointer and the center of the zero scale

1mm

8 Needle adhesion

Instantaneously add the full scale current three times the overcurrent, 7 seconds later slowly reduce to the full current of 1/2, at this time, the finger

The needle may stick at the bottom because of the difference in ambient temperature, but the needle should return to the specified range.

Within 1/2 of the full scale

9 Pointer oscillation

The maximum current is added in a linear manner within 5 seconds and then reduced to zero in a linear manner within 5 seconds.

Pointer oscillation without stopping Abnormal conditions such as stopping

Package

1*MFJ standing wave meter head radio station power meter transmitter with backlight SWR Watt Meter