Hej Bruce,
On 12/28/2010 03:43 AM, Bruce Griffiths wrote:
Magnus Danielson wrote:
Actually, I ended up feeding a 10 kHz signal into the ARM1 input and
then let the 5 MHz sines hit the Ch1 and Ch2 inputs.
The 5 MHz + 7 dBm sine signal has a limited slew-rate, so this puts
some extra stress on the inputs compared to a slew-rate optimized
signal. However, all the involved counters gets the same signal.
I found that a +13dBm signal gives far lower trigger jitter in my 5370A,
even the effect of attenuating the input by 3dB is very noticeable.
To no big surprise. However, I cannot use that kind of signal level
freely over the lab. I need to clip the signal or else I am in danger of
burning up the inputs of the Wavecrests.
Either add a buffer amp with a gain of about 6dB or use a pair of
2N3904s configured as an LTP diffamp with a gain of about 10 to increase
the input slew rate.
Which is among the first things I would consider. Easy enough to cook up.
Cheers,
Magnus
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