re-calibrate hickok 800 - Printable Version
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re-calibrate hickok 800 - murf - 06-26-2015
Hi Guy's,
Anyone know what it costs to have a Hickok 800 calibrated?
Thanks,
murf
RE: re-calibrate hickok 800 - klondike98 - 06-27-2015
Was hoping someone who had done it would answer but I seem to recall reading someone who offered cal in the $150 range but don't think that included shipping. Cannot seem to find that reference now though.
RE: re-calibrate hickok 800 - TA Forbes - 06-28-2015
If you have the test equipment recommend Alan Douglas' book, it has good information in it about the calibration of almost any Hickok tester. Most of them employed the same circuit and associated voltages.
If not: http://www.alltubetesters.com/
Or: http://www.radiolaguy.com/info/tubeTesterRest.htm
RE: re-calibrate hickok 800 - Phlogiston - 06-28-2015
Would strongly that you get the procedure and do it yourself. You will gain a much better understanding of what your tester is doing and how it is being done AND possibly what to look for in respect to tubes that tube testers do not test very well. Schematic for 800A here:
http://bama.edebris.com/manuals/hickok/800a/
But you will need to search for alignment instructions as well.
MOST important to note that the alignment(s) were written for people using 10,000 ohms/volt meters ( you will need to use resistors if using a digital VOM).
RE: re-calibrate hickok 800 - TA Forbes - 06-29-2015
The ohms per volts is usually included in the calibration instructions. As a rule, the earlier the instrument or radio you are working on, the lower (and hence more "loading" of the item you are measuring) the ohms per volt rating specified for the VM required.
Since we are on the subject, I would like to recommend to all of you an instrument that a good bud gave me a year ago. It is a military AN/USM 223 Multimeter. One of the neat features it offers is the option of 1000 ohms per volt OR 20 thousand ohms per volt for DC measurements.
RE: re-calibrate hickok 800 - Phlogiston - 07-04-2015
(06-29-2015, 11:37 AM)TA Forbes Wrote: The ohms per volts is usually included in the calibration instructions. As a rule, the earlier the instrument or radio you are working on, the lower (and hence more "loading" of the item you are measuring) the ohms per volt rating specified for the VM required.
Since we are on the subject, I would like to recommend to all of you an instrument that a good bud gave me a year ago. It is a military AN/USM 223 Multimeter. One of the neat features it offers is the option of 1000 ohms per volt OR 20 thousand ohms per volt for DC measurements.
Yep.
I have 2 or 3 nice VTVMs. I think the last one I was using was not isolated from the line. Dumb. Don't remember the ohms/volt on it.
Really the best for caling the old tube testers would be the 80s model Archer (radio shack) I keep at home to check such thing as AA batteries, replaced at the shop with the big $$ Fluke.