[TenTec] centurion

[Floyd Sense]

Rodney - chances are good that EVERYONE who owns a Centurion has a meter 
that doesn't read correctly.  Changes in value over time of the resistor 
string involved in developing the meter voltage will result in an 
erroneous reading.  The meter has a separate cheap single-turn pot in 
series with it to calibrate each of the voltage and current 
measurements.  The  pots age and change position with vibration when the 
amps are shipped.  To further complicate things, quite a few Centurions 
were shipped with meters that weren't the full scale reading value that 
the design called for.  So, if you use the official Tentec procedure to 
calibrate the grid current scale for example, the result will be 
incorrect readings.  The best approach for the high voltage reading 
would be to use a high-voltage probe on an external voltmeter and see 
what the high voltage really is under no load and then adjust the HV 
calibration pot to match that reading.  Unfortunately, you can't get to 
any of the meter calibration pots without removing the cabinet and 
defeating the HV interlock switch.  While it's possible to simply remove 
all the screws and slide the cabinet towards the rear a bit so you can 
get to the pots, doing so can result in the interlock switch activating 
and probably destroying the bias resistor(s).  You can assume that I 
know that from experience.   Of course, once you have the HV meter 
properly calibrated, the voltage may still be reading too low, which 
indicates power supply problems.


73, K8AC


On 4/6/2018 5:01 PM, Rodney wrote:
> The manual has 3100 dc no load 2600 loaded . My one has 2100 no load  I wonder if the meter is wrong., Anyone else have this problem.
>
> ---
> This email has been checked for viruses by AVG.
> http://www.avg.com
> _______________________________________________
> TenTec mailing list
> TenTec at contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec