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Re: Differences in 942c20p15k caps



Original poster: "huil888" <huil888@xxxxxxxxxxxx>

Hello Stephen -

Something seems to be wrong here; neither of the capacitors you are describing have the physical dimensions shown on the C-D website for type 942C20P15K capacitors (0.15uF at 2,000 VDC). Have you actually measured the capacitor's diameter, or are you estimating their dimensions?

According to C-D's tech data, the maximum body diameter of the .15uF, 2KV capacitors is 1.161" (29.5mm); I have a large quantity of these caps from several different manufacturing lots, and they all measure a very consistent 0.98" to 0.99" diameter.

The only 942 series, 2KV capacitors with a body diameter of around 0.50" are the 942C20S1K (0.01uF) with a body diameter of 0.472" (12mm), or the 942C20S15K (0.015uF) with a body diameter of 0.571" (14.5mm).

Are you sure that you are reading the part number correctly? There is only one character that is different between the 0.015uF and the 0.15uF caps.

Have you measured they actual capacitance value? It would be very unusual, but not impossible, for a batch of capacitors to be mis-labeled.

The alpha-character markings are the manufacturing date code. C-D's rather strange date coding scheme for these caps consists of two alpha characters representing the Month and Year of production. The month code starts with A for April, B for May, etc and ending in L for March. The year code starts with A for 2003, B for 2004, etc. Not all 942 series capacitors that you may find will be date-coded; I have some 2.5uF, 600V caps that lack a date code. These were probably made before the start of date-coding in 2003.

Your caps date coded "GD" would mean they were manufactured in October of 2006. CD would be June of 2006, etc.

Double check the part numbers printed on the caps, then check the actual value with an accurate capacitance meter.

Regards,
Scott Hanson

----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Thursday, April 12, 2007 10:12 PM
Subject: Differences in 942c20p15k caps


Original poster: "stephen costanza" <baywatch106@xxxxxxx>


I had just purschased some of the 942C20P15K cap frome two different sources.
One set are 3/4'' in diameter and have a   GD  on the very bottom.
My other caps are a 1/2" in diameter and have CD , AD or MD on the very bottoms. They all have the same numbers and ratings. Why the size difference between the two and what is up with the two letters? Are they the manufacturers name?
I have 16 of the GD  and 16 of the 1/2 others.