[Hallicrafters] RE: [Boatanchors] Voltage Calibration with 1000ohm/volt vs 20000ohm/volt meters ?

[Roger K8RI]

There are other dangers with solid state meters in addition to the input 
impedance.
"Unless stated" they can give some strange readings on AC that isn't a 
perfect sine wave and they tend to treat noise spikes as if they are part of 
the wave form when it comes to giving equivelant RMS readings.  So, be wary 
of solid state meters when reading AC voltages that may not be ture sine 
waves, such as coming out of a constant voltage transformer.  I have a *big* 
Sola constant voltage transformer that gives good readings on my Simpson, 
but the readings from the solid state meter are way off.

When I worked as a calibration technician we kept some VTVMs and Simpsons 
around for working with SCR circuits.  (In this case SCR stands for both 
Silicon Controlled Rectifiers and Saturable Core reactors).

We had two 500 MCM cables feeding each Silicon Controlled Rectifier, so I'll 
let your imigination figure out what size SCRs we were using and the current 
they were carrying.  BTW, these were not 110 volt circuites either.

73

Roger (K8RI)