Page 1 of 1

Notice Regarding Faulty BNC Cables

Posted: 05 Sep 2016, 19:19
by Steven Sesselmann
Hi Guys,

It has become evident that some of the RG174/U BNC cables I received from my supplier were faulty and break down at high voltage.

If you purchased a GS-1100A or GS-1100-PRO in the last three months you may have received one of these faulty cables. If you are getting good spectra with good resolution then your cables are most likely fine, but should you experience a sudden loss of resolution it's worth checking the cable.

Please let me know if anyone has had a problem like this.


Steven

Re: Notice Regarding Faulty BNC Cables

Posted: 03 Oct 2016, 22:14
by WillemG
Hi Steven,
You indeed sent me a RG174/U BNC cable with the GS-1100-PRO shipment to me.
Do you mean that I must prevent high voltage on this cable ? Is a simple resistance measurement helpful ?
I first have to solve a "problem" with a Bicron3M3/3P detector where I am considering not to use the P-14-X preamp. I first have to find out the right (-24V) power connection for the preamp (RS232 plug). Further I fear that signal gain will be too high when using the P14X and the GS1100 (maybe setting GS1100 to 10% gain ?). Otherwise I can take the signal directly from the anode- of course via a condensator to prevent the HV- to the GS-1100 via the RG174 cable. What would you advise me ? Too long a signal line could give loss of signal.

Re: Notice Regarding Faulty BNC Cables

Posted: 04 Oct 2016, 08:33
by Steven Sesselmann
Willem,

I can not say for sure who got the faulty cables, but there could be about 10-20 customers who received cables from this batch, some might be okay, but there is a good chance they will break down at high voltage.

I suggest buying a good quality BNC cable if you are in doubt.

Regarding the voltage divider, you don't need any preamplifier, just a simple divider will suffice for the GS-1100A.

The 14 pin divider I make can be wired for single wire or split signal.

http://www.gammaspectacular.com/gamma-s ... -base-14-2

Steven

Re: Notice Regarding Faulty BNC Cables

Posted: 04 Oct 2016, 19:25
by WillemG
Hi Steven,
Thanks for your advise.
Yes, a good quality BNC cable will be helpful; the RG174 cable is rather thin and could suffer from mechanical impact.
I will look further into the P14X base of the Bicron 3M3/3P and bypass the built-in preamp; with help of Saint-Gobain- Bicron schemes.

Willem