Bias reading issue with analog meter

[kaos513]

Hello i purchased a 200 mA analog meter testing my 148gtl i tested my final driver it works perfect,when i test the bias driver it pins the meter all the way any help would be great.

 

[Robb]

Gonna try this again; eh? Good; never give up!

First of all, you test in in either USB or LSB mode; not AM. Goes for the driver as well as the final. Second, be sure to turn down the mic gain to zero. Lastly, put the radio on CH19. Then you can key the mic and test.

 

[OldTech03]

Hello i purchased a 200 mA analog meter testing my 148gtl i tested my final driver it works perfect,when i test the bias driver it pins the meter all the way any help would be great.

If you purchased an analog meter FACE it most likely has no shunt so you will have to provide one. Do you know the FS- "Full Scale" current it usually is 1mA if so then approximately 10 Ohm 1/2 watt resistor but this may not be deadly accurate and would help to have a bench meter with current measuring ability to calibrate

OldTech...

 

[kaos513]

If you purchased an analog meter FACE it most likely has no shunt so you will have to provide one. Do you know the FS- "Full Scale" current it usually is 1mA if so then approximately 10 Ohm 1/2 watt resistor but this may not be deadly accurate and would help to have a bench meter with current measuring ability to calibrate

OldTech...

Says direct connect no shunt need it.

 

[kaos513]

Gonna try this again; eh? Good; never give up!

First of all, you test in in either USB or LSB mode; not AM. Goes for the driver as well as the final. Second, be sure to turn down the mic gain to zero. Lastly, put the radio on CH19. Then you can key the mic and test.

pegs my meter on the bias driver side but final bias side i get acurate reading.

 

[bob85]

Check the driver bias diode is not open circuit.

 

[kaos513]

Gonna try this again; eh? Good; never give up!

First of all, you test in in either USB or LSB mode; not AM. Goes for the driver as well as the final. Second, be sure to turn down the mic gain to zero. Lastly, put the radio on CH19. Then you can key the mic and test.

why not fixed all the radios i have thanks to everybody here .

 

[kaos513]

If you purchased an analog meter FACE it most likely has no shunt so you will have to provide one. Do you know the FS- "Full Scale" current it usually is 1mA if so then approximately 10 Ohm 1/2 watt resistor but this may not be deadly accurate and would help to have a bench meter with current measuring ability to calibrate

OldTech...

its a
DC 0-200mA Analog meter

 

[loosecannon]

Bob85 has already alluded to the most likely culprit.

the bias diode is that thingy that is mounted to the heat sink right next to the driver.
there is one for the driver and there is one for the final.

unsolder the leads from the board, and use your DMM on diode function to test it just like you would any other diode.
LC

 

[Tallman]

Hello i purchased a 200 mA analog meter testing my 148gtl i tested my final driver it works perfect,when i test the bias driver it pins the meter all the way any help would be great.

Is this just a panel meter? If it is you might cause more damage by using it. If you have a Harbor Freight near by get one of those elCheapo DVM's they sell or go by Sears and buy on of those. You need to have a meter that has Multiple Meg Ohms per volt impedance.