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Model 5 Amateur Radio Power Test Unit 
Features

Verify incoming DC power polarity
*before you connect your radio.

Verify incoming DC voltage
*before you connect your radio.

Monitor radio DC current consumption
  while using your radio.

Red and Green LEDs monitor input DC voltage polarity.
Red LEDs show REVERSED input voltage polarity.
Green LEDs show POWER GOOD input voltage polarity.

Pair of Red and Green LEDs on both sides for
  easy visiblity from any angle.

45 Ampere Anderson Power Pole DC Input and Output connectors.

Meter tip jacks fit standard meters with 0.080" tips.

Current Measurement using a standard DC millivolt meter.
200 millivolts -> 20 amperes
100 millivolts -> 10 amperes
  50 millivolts ->   5 amperes

Voltage measurement of input DC voltage using a standard DC voltmeter.

Air cooled.

An essential GO-KIT item for
  Field and Disaster Operations.


 
 
Model 5

Model 5

Model 5
Operation


Using the Model 5 with a DC voltmeter to measure the incoming DC voltage for your radio:

Place the meter in the DC Volts mode and the scale to 0-20 Volts.

Place the tip of the positive terminal probe into the Meter IN jack of the Model 5.

Place the tip of the negative terminal probe into the Meter COM jack of the Model 5.

Read the incoming DC voltage to the Model 5 on your meter.

 



 
 




Model 5 Voltmeter

 

Using the Model 5 with a DC millivoltmeter to make a high current DC ammeter:

Place the meter in the DC Volts mode and the scale to 0-20 Volts.

Place the tip of the positive terminal probe into the Meter IN jack of the Model 5.

Place the tip of the negative terminal probe into the Meter OUT jack of the Model 5.

Place the meter in the DC Volts mode and the scale to 0-200 Millivolts.

10 millivolts read on the voltmeter is equivalent to 1 ampere of current. So, 50 millivolts is 5 amperes of current. Here are more samples:

10 millivolts is equivalent to 1 ampere.

50 millivolts is equivalent to 5 amperes.

75 millivolts is equivalent to 7.5 amperes.

100 millivolts is equivalent to 10 amperes.

150 millivolts is equivalent to 15 amperes.

200 millivolts is equivalent to 20 amperes.


 
Model 5 Ammeter

Using the Polarity Indicating LEDs to determine the input DC voltage polarity:

If the Green LEDs glow when you connect the Model 5 to your 12 Volt DC power source, all is good. Polarity is correct.

If the Red LEDs glow when you connect the Model 5 to your 12 Volt DC power source, the polarity of the 12 Volt DC power source is not correct. Repair this before connecting your Radios.
 
 

Model 5 Green LED

Model 5 Red LED