[Boatanchors] Voltage Calibration with 1000 ohm/volt vs20000ohm/volt meters ?

[Philip Atchley]

Hi,

If you're using a 20K/Volt meter (Simpson), it's pretty easy to "simulate" a 
1K/Volt meter (alas, going the opposite way isn't true).  Simply take a 
resistor of the proper value and put it in parallel with the 20K/Volt meter 
leads.  That is, if you're using the 50 Volt range, put a 50K resistor in 
parallel with the Simpson.  In reality, this will be a tad low since it's in 
parallel with the 20K/Volt meter, but should be close enough for government 
work (TV7-U).  If you're really concerned about accuracy you can calculate 
what the "real Value" should be, taking into consideration the impedance of 
the Simpson and use multiple resistors (or a pot) to get the correct value.

73 de Phil,  KO6BB
991 Different NDB's heard to date.
SWL QSL GALLERY: http://photobucket.com/albums/y123/KO6BB/
THE BEACONEER'S LAIR:    http://www.geocities.com/ko6bb/
Merced, Central California, 37.3N  120.48W  CM97sh



Hi Mike,

There is no clear answer. In general, the reading on your Simpson
may be higher than on the 1 k Ohm/V - but it depends on:

1. the impedance of the circuit you are measuring, and
2. the calibration of the two meters.

73 de Brian, VK2GCE.


Mike said:
I want to calibrate my TV7-U tester and want to know
how much of a differance in voltage reading would I
get using a 1000 ohm/volt mster (called for and dont
have) vs a simson 260 @ 20000 ohm/volt meter.