What I am ACTUALLY trying to measure is the internal clocks for the 184 and the 501. I need to make a 10Mhz measurement for the 184 this need to be 10 Mhz +/- 100 Hz with less then 3 PPM drift over time after a 2 hour warm up for the crystal.
We thought you were trying to calibrate your 7000. Has that changed?
Why are you trying to "trying to measure is the internal clock
s for the 184"? All the clocks are derived from the crystal, so you only have to measure the frequency of one of them. Choose one frequency that is within the range of your existing counter, or compare it with a GPS or WWV etc.
But if you are only trying to calibrate a 7000, why do you need that precision in the first place?
My suspicion is that if the 184 is working (and its internal analogue frequency dividers can be pernickity!) then it will be sufficient to calibrate the 7000.
Yes, it can be fun to make sure the extra digits are correct, but it is easy to fall into the timenut rathole without good cause.