Unit Key Data
- Instrument: HP-5316A
- Serial Number: XXX
- Source: ebay/bpsgresale
- ordered 20191004
- delivered 20191107 [or close]
- Pictures: XXX
- : [operational]
 Multi-Hour Performance Assessment
Although I’ve been using this unit for over a year by now, I never got to blogging its performance. Today, I connected the unit to the (GPS/PLL locked) 10 MHz GPSDOCXO Reference, and let both warm up for several (> 2) hours. (I had activated the channel-A attenuation.) The readout had stabilized at 10,000,013.4 Hz, in other words, within 1.4ppm:
This is within (frequency) spec: The standard time-base accuracy is specified as within 5ppm over 0 to 50°C temperature range and the aging is within 0.5ppm/month (this, actually, is a beautiful figure; might consider to calibrate the time base).
Some more pictures are here.
As a side note: I really need to remind myself to use proper 50Ω feed-throughs since the HP-5316A does not have 50Ω inputs.