I have one Z3000 and it's not quite as helpful as I had hoped.  It's nice for quickly tuning your VCOs together (like adjusting all to A440) but no good if you want to calibrate anything, or to adjust to intervals as those would not be whole numbers.  For that, you need something with hundredths or thousandths places. 

(I suppose it's possible to tune intervals by sending a midi A-note to VCO 1 and setting to 440Hz, then sending a different midi note to VCO 2 (5 semitones down would be the E below the A) but also tuning to 440Hz....that could work, right  Then when you send A to BOTH VCOs, you should have a decent 5th interval with VCO2 now 5 semis above VCO1, but I haven't tried this)

My portable DMM has a freq counter which I've used to calibrate some VCOs and VCFs, but I'd prefer to get a dedicated bench unit if I continue to build and service my own gear.  My DMM has 4 number places, so I can adjust to 8.000Hz or 3200Hz, but not 3200.000Hz.  Another option would be to use a free computer-based analyzer for precision adjustment. 

Sent from the future

On Nov 7, 2014, at 5:01 AM, "David Kellett davidkellettwoulf@... [Doepfer_a100]" < Doepfer_a100@yahoogroups.com > wrote:

 

Ahh - I had not realized about the ability to measure an external signal. That would be very handy!!

Thanks for the info,

David 

www.movingisliving.co.uk

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On 7 Nov 2014, at 09:23, Brian Hamlin brianhamlin@... 1 < Doepfer_a100@yahoogroups.com > wrote:

 

The Toptop Z3000 oscillators have a frequency counter built in. There's an input for measuring external sources and you get an extra VCO into the bargain.