To get the typical -124dB @1kHz @0dBV you should set the output signal to -20dBFS, the output attenuator at 20dBV and the input at 10dBV.
Use a low sample rate (44.1 or 48 kHz) and use one channel only.
There is no way to shut off one analyzer channel completely. Just unplug the input cable and leave the inputs open. Or short the unused input to pin 1 of the XLR.
Use a low sample rate (44.1 or 48 kHz) and use one channel only.
There is no way to shut off one analyzer channel completely. Just unplug the input cable and leave the inputs open. Or short the unused input to pin 1 of the XLR.
Just wanted to let you know that the RTX works well with a measurement microphone. No microphone preamp needed with the 100 mV input. All you need is to provide the phantom voltage to the microphone. I used a Behringer Micropower PS400 to achieve that. Easy!
OK, time to address a couple of the issues that have been raised over the last couple of months.
Instability with certain source impedances (inductive).
I have looked at the cause and possible solutions. After a lot of simulations and measurements I ended up with a solution that is simple to implement and doesn’t have any significant impact on the performance.
The solution involves adding a series combination of a 22 pF capacitor and a 1.5 kohm resistor from each input line to ground. So 4 of these are needed. They can be added internally on the PCB or they can be added in the XLR connector of the input cable.
Shields.
As mentioned here I have designed a shield for the input amplifiers of the RTX6001.
The shields are back from manufacturing and they are ready for shipping.
We have put together an upgrade kit, consisting of 5 x 22pF/200V NP0 capacitors, 5 x 1.5kohm resistors, 2 x wires and 2 x shields. Why 5 x capacitors and resistors when only 4 are needed? To have one spare in case something goes wrong 🙂
I expect that the upgrade kits will be sent to all customers this week. And they are free of charge.
RTX does not offer to mount the upgrade kits in this case.
Please see the attached documents for information on how to install the shields and mount the components.
Jens
Instability with certain source impedances (inductive).
I have looked at the cause and possible solutions. After a lot of simulations and measurements I ended up with a solution that is simple to implement and doesn’t have any significant impact on the performance.
The solution involves adding a series combination of a 22 pF capacitor and a 1.5 kohm resistor from each input line to ground. So 4 of these are needed. They can be added internally on the PCB or they can be added in the XLR connector of the input cable.
Shields.
As mentioned here I have designed a shield for the input amplifiers of the RTX6001.
The shields are back from manufacturing and they are ready for shipping.
We have put together an upgrade kit, consisting of 5 x 22pF/200V NP0 capacitors, 5 x 1.5kohm resistors, 2 x wires and 2 x shields. Why 5 x capacitors and resistors when only 4 are needed? To have one spare in case something goes wrong 🙂
I expect that the upgrade kits will be sent to all customers this week. And they are free of charge.
RTX does not offer to mount the upgrade kits in this case.
Please see the attached documents for information on how to install the shields and mount the components.
Jens
Hi Jens,
That is outstanding customer service! Many thanks for your continuing efforts to improve your instrument.
As it turns out, I use it every day. Normally not to the extremes of it's capabilities, but the extra information it shows can be invaluable.
-Chris
That is outstanding customer service! Many thanks for your continuing efforts to improve your instrument.
As it turns out, I use it every day. Normally not to the extremes of it's capabilities, but the extra information it shows can be invaluable.
-Chris
Hi Jens,
Impressed I am !
I'm really happy to have been on the group by...
All the best from France
Impressed I am !
I'm really happy to have been on the group by...
All the best from France
That's Great!I'm live in china.Last time my RTX was sent to Hong Kong,I hop this time the upgrade kits can be sent to china,does it possible?
Jens,
You engineering prowess is only bested by your commitment to your product.
Thanks a lot.
You engineering prowess is only bested by your commitment to your product.
Thanks a lot.
@ SilentGrace
We received a Hong Kong address from you, so that is where it has been shipped.
Note: the upgrade kits are sent via regular mail, not DHL, so it will take a bit longer.
@diyaudnut
The material is nickel silver.
We received a Hong Kong address from you, so that is where it has been shipped.
Note: the upgrade kits are sent via regular mail, not DHL, so it will take a bit longer.
@diyaudnut
The material is nickel silver.
I have no experience with SMD soldering. Is there a good and simple tutorial for this kind of stuff?