On 18/07/16 09:27, JC wrote:
So, hoped to have left all this mechanical error measurement stuff
behind me back in the 80's but I guess with the renewed interest in
vinyl its all coming out of the woodwork.
Leader LFM=3610 W&F meter, customer wants it calibrated or at least
verified. don't have schematics or full cal manual. Manual I do have
suggests use of Leader LFM-7000 W&F calibrator, don't have that either.

So........ How can I reproduce some of the cal signals, for example JIS,
1%, 4Hz modulation at 1vrms?

JIS is 3KHz sine, so no problem, but how to add the 4Hz modulation? FM
obviously, (AM would be easy), but how? Can't be a 4Hz sweep on 3Khz,
can't be a 4Hz burst? Superimposed 4Hz on 3Khz? How to quantify 1%?

I have a wide range of hardware and software signal gens available but
no idea how to mimic this accurately.

AD9851 module and an Arduino? It probably wouldn't even be necessary
to calibrate the primary crystal source, or switch to a TCXO.