[time-nuts] Picking a good HP 10811

[Stanley Reynolds]

The HP10811 has about +- 10Hz coarse adjustment would it be a good idea to make sure they don't have the same frequency by adjusting them in opposite directions from 10 Mhz before the test, like 10Mhz+4hz, 10Mhz, and 10Mhz-4hz for three. Would assume the common oscillator would be 10 to 20 Khz above or below the DUT.

Or does the sound card method work better with small differences ?

The manual recommends grounding the ECC line during tests. Maybe the test rig could set the ECC different on each one in the test. This would result in a much smaller difference and maybe no difference depending on each oscillator zero volt ECC frequency. ECC is listed as 1Hz range for -5 to +5 volts.

Would attenuation of the DUT signal physically separated from the mixer but after and buffer amp help ?