WB Heater testing

[bcroe at juno.com]

Crescent Kao, and others

On Sun, 30 Dec 2001 01:17:18 -0600 bcroe at juno.com writes:
> OK, here's a couple ideas on checking the heater circuit.
> 
> Connect a 10 ohm 10 watt resistor and a voltmeter to the
> heater terminals.  Apply 14 volts to the battery input.  The 
> voltage at the heater terminals should rise in a few 
> seconds to between 10 and 10.5 volts.  Move the 
> voltmeter to across the 1 ohm 5 watt WB resistor, and 
> the voltage should be around 1 volt.  The heater LED 
> should come on.
> 
> Repeat the tests using a 5 ohm  10 watt resistor.  A 
> pair of 10 ohm in parallel will work.  The voltage across 
> the 5 ohm should be around 6.25 volt, and across the 
> 1 ohm, 1.25 volt.  The LED should not come on.  Do 
> not leave this powered any longer than necessary to 
> make the measurements, or the heater regulator will 
> get very hot.
> 
> Bruce Roe

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