Electronics > Metrology

external 10M ref for scope

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jonpaul:
Hello again the Trise is very good on the LB GPS, you need a fast scope to check the real RT, we should ask Leo.

I saw 650 pS into 50 Ohms at 32 mA output, but scope was 500 MHz Yokogawa.

I think its faster.....need to crank up my Tektronix 7104 and 7A29 plugin to get a 1 GHz RT analog ....

Jon

metebalci:

--- Quote from: jonpaul on January 21, 2022, 08:18:51 pm ---Hello again the Trise is very good on the LB GPS, you need a fast scope to check the real RT, we should ask Leo.

I saw 650 pS into 50 Ohms at 32 mA output, but scope was 500 MHz Yokogawa.

I think its faster.....need to crank up my Tektronix 7104 and 7A29 plugin to get a 1 GHz RT analog ....

Jon

--- End quote ---

I checked with 2.5GHz, 20GSa/s, rated less than 140ps rise time.

jonpaul:
Rebonjour a tous:

Found all the splitters and cables needed to form a GPS master clock with the Leo Bodnar set at 5 or 10 MHz and 32 ma output, driving  a chain of 2X >>4X splitters.

Old Merrimack 4 way splitters  are much better than the specs: BW ~ 500 kHz..200 MHz at 50 Ohms.

Mini-Circuits  ZFSC-2-1 2 way splitter is speced 5-500 MHz but measures much wider BW.

 Either 75 Ohm or 50 Ohm splitters are  OK on 50 Ohm Zo. Splitter Attenuation  ~ 3..6 db

Check every device EXT CLK  spec for Zin and Freq.

Yokogawa scope DL7440: NO EXT REF CLK, only EXT timebase...

HP4195A : 10 MHz/N   N = 1..10 autolock, 

EIP - Phase Matrix 575 counter: 10 MHz 1V PP 300 Ohms

HP3325A synthesizer 10 MHz/N N = 1-10 autolock, 0 dbm 50 Ohm

HP 8640B RF generator 5 MHz >100 mV Zo 1k Ohm

 Either a dual output GPS or a 5 MHz GPS followed by a frequency doubler can run either 5 or 10 MHz instruments.

Bon dimanche,

Jon

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