Beringher CT100.. X Pattern on LED grid when testing an xlr cable
Hey all, Im using a Beringher CT100 cable tester and I'm a little confused with a reading im getting from acouple of cables,
Im getting an X pattern on the LED grid when testing some xlr cables... What does this mean?
The cable is being used for microphones and is a standard two core plus sheild balanced cable, Ive re-solderd both ends twice to be sure the wires are solderd to the correct pins and I'm still getting the same reading..
I know this reading is correct for a mono unbalanced cable or xlr-jack cable but the manual staes that I should be getting a diagonal reading on the testers LED grid...
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Re: Beringher CT100.. X Pattern on LED grid when testing...
This site has diagrams... not the best but clear enough.
PLEASE note that the pin numbering is kind of goofy... The pins of both the male and female tie to identical pin numbers.
You PROBABLY have misread the numbering at one end.
A KEY thing is to get the shield on pin 1 at both ends.
I recommend that you uncap BOTH connectors, mate them, and verify the same color goes straight across as you solder the wires..
Note: I had some brand new cables delivered that the shield had been connected to pin 3 (middle one) and I had hum ! Note that this defect would NOT be caught by your cable tester as there was conituity between corresponding pin numbers.
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That would be a very odd situation. My question would be has it always done this, or is this something new? Is in in all cable formats, or just xlr? You could open the unit and make sure a stray wire strand isn't across wire terminals, but that would be the limit of user servicable things for this. Other than that, contact the manufacturer.
Check the cables. If one lead of an XLR-XLR cable is shorted to ground, 6 DB gain is lost. You haven't really supplied enough information regarding cables and model of the manual mixer for us to help much. Do check that ALL of your audio interconnections are BALANCED lines either XLR to XLR or TRS cables. Grounding one side of a balanced line reduces gain 6 DB. Try swapping mic cables and channels to test where the problem is in the system.
Make sure your mic cables are XLR to XLR and not cheesy Karaoke type cables with 1/4 inch mon plugs on the end. Please note that I have found some mic cables with wiring errors. They had the shield and one of the signal lines reversed. please verify that your XLR mic cables are wired with:
Go to thiis site and verify your cables: http://www.toffer.com/wp/2008/08/07/3-pin-xlr-wiring-diagram/
Please note the pin numbers as they may not be what you expect. Ground is actually the shield or braid and the red and black are twisted pair signal lines.
Personally I would run the RCA outputs to the RCA in on the APS. If you insist on using XLR from the APS to the board (like through a snake etc) I would higly recommend using XLR to 1/4" adapters. These things have wonderful little transformers in them (yes, wire wound transformers) that do the 1/4" to XLR conversion really nicely so that you can run your signal through the snake or just so that you don't get the hum and distortion that can be associated with unbalanced signal transfer. You want a HI-Z unbalanced to LO-Z balanced adapter. Not always easy to find, but if you absolutely cannot locate any, I have a couple in stock. I suggest you look around though, because mine aren't cheap!
Thiis amp has plenty of gain for mics. Make sure your mic has a good XLR to XLR cable (balanced) and connects to the XLR input connectors. If you have 1/4 inch jack cables that aren't TRS balanced on the mics, get rid of them and get XLR's.
Then push the PFL button down (LED will light red) for a single channel with a mic and adjust the trim (top knob for the channel) so that the level peaks without clipping on the main LED display when highest input to the mic is being generated. You should not get clipping then during operation.
After that you use the slider tio adjust the level for the mic. The MAIN slider should be at least up around -10 to zero during operation. If your main slider is way down, then you haven't balanced your channels properly. Do the same for each channel as the instructions for the mic above. If the gains of the other inputs are too high and the MAIN slider too low, this is what is causing your problem.
Typically the trims for mics like Shure 58 are about 3 o'clock.
High level guitars may have trims anywhere from 9 to 3 o'clock.
Ideally you will want your channel sliders to be between -10 and zero.
You just plug both ends of the cable in and there are indicators showing condition.
HOWEVER: I recently found 6 brand new cables that resulted in HUM from mics. These cables had a pair of wires reversed at BOTH ends and contiuity was fine, but the shield was on the wrong pins of the XLR.
If this is your problem, you will find that the shield of the XLR is connected to pin 3 instead of pin 1. The numbering of the pins are weird on XLR connectors with pin 3 at the APEX of the triangle.
Cables MADE IN CHINA... I changed all the connections on site of the gig as I had soldering equipment. I informed the vendor... they had 13000 of these in stock and many must be in the field. They were going to check them,,, I am sure my 6 cables wern't the only bad ones.
Moral of the story: there is more to electrical cables than just continuity!
I can understand your confusion... and a lot depends how you are going to use this. There are some caveats regarding the connections,
If you use the 1/4 outputs on the GSP, there is a speaker modeling like function that is NOT available, that IS available IF you use the XLR outputs.
The STP is an "Insert Snake" which is not really what you want as it is intended to send and receive (audio going both directions in the cable.
If you want that speaker function, then you should get two XLR to 1/4 TRS cables and go from the XLR's on the GSP to the Left and Right inputs on the back of the Crate. Your audio or guitar then is connected to the GSP guitar input.
If you connect the guitar to the crate and then use the STP, Plug the TRS single connector into the Left/Mono/send/rtn on the Crate. The Send cable of the Y should go to the Send jack on the back of the GSP and the return should go to the left return jack of the GSP. This connection I would NOT recommend as it will be noisier and you will lose the stereo effect capabiltiy since the effect is inserted as a mono.
I believe you would be happier with using the XLR's to carry left and right to the Crate and run your inout to the GSP. In short, you have the wrong cable to do the best job.