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G8MNY > TECH 27.09.14 13:06l 47 Lines 1837 Bytes #999 (0) @ GBR
BID : 11136_GB7CIP
Read: GUEST
Subj: Maplin 13A Socket Mains Tester
Path: IW8PGT<CX2SA<VE2PKT
Sent: 140927/0831Z @:VE2PKT.#QBC.QC.CAN.NOAM #:58211 :11136_GB7CIP
R:140927/0816Z @:VK4TUB.#NQ.QLD.AUS.OC #:26103 [Townsville Qld Oz]
R:140927/0813Z @:NA7KR.OR.USA.NOAM #:6410 [Independance] $:11136_GB7CIP
R:140927/0740Z @:GB7JED.#71.GBR.EURO #:2341 [ScottishBorders] $:11136_GB7CIP
R:140927/0619Z @:GB7CIP.#32.GBR.EURO #:11136 [Caterham Surrey GBR]
From: G8MNY@GB7CIP.#32.GBR.EURO
To : TECH@GBR
By G8MNY (New Aug 14)
(8 Bit ASCII graphics use code page 437 or 850, Terminal Font)
This is a 230V AC 3 neon plug in safety tester. It can only detect simple
wiring faults!
Inside there is 2 PCB with the Neons & 8 Rs.
LiveÄÄÄÂÄÄÄÂÄÄÄÄÄÂÄÄÄÂÄÄÄÄÄÂÄÄÄ¿
R1 DS1 R4 DS2 R7 DS3
56K (=) 82K (=) 68K (=) * * * Mains OK
ÀÄÄÄ´ ÀÄÄÄ´ ÀÄÄÄ´ * * . No Earth
R2 ³ ³ * . . Live or Neutral reverse
82K R5 ³ . * * No Neutral
NeutralÄÄÄÄ´ 68K ³ . . * Live or Earth reverse
R3 ³ ³ . . . No Live
33K ³ R8
ÃÄÄÄÄÄÄÄÄÄÙ 82K
R6 ³
33K ³
EarthÄÄÄÄÄÄÁÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ
I took mine apart after DS3 started to flicker & then went permently out!
On testing with an isolation transfomer fed from a variac. I found all it
worked properly on 260V. For some reasion the attenuation differences in DS1 &
DS3 feed Rs seems to be wrong. Isolating the Rs they are all quite nominal &
swapping the neon around did not move the fault.
So I replaced R7 & R1 with 100Ks, and it all works correctly now all 3 neons
extinguish near 210V, & the varioss fault indication function all tested.
See my tech bul, "Maplin Mains Meter 2000MU-UK"
Why don't U send an interesting bul?
73 De John, G8MNY @ GB7CIP
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