Programmed Period | Reading |
1000 s | 1000.266442 |
100 s | 100.0053211 |
10 s | 10.0000525 |
1 s | 1.000000450 |
0.1 s | 0.1000000024 |
0.01 s | 0.0100000002 |
I made test with only some periods.
Test setup. HP53131A
SDG2042X FW 2.01.01.23R5 HW 02-01-00-35-00
Both equipments use same frequency reference clock, in this case both use HP53131A internal (option) OCXO what really is very good and with exellent short time stability. Much better than example Trimble GPS crap or cheap Rb oscillators if look very short time jitter. Long time drift is other thing. And in this setup, drift in period time is nearly eliminated because both use same reference. (but locking quality to reference may differ but no need "time nutting" for this case)
Signal level from SDG to counter 3Vpp @ 50ohm. Counter trigger (Auto Off) level set to zero and positive edge. Counter in DC coupling mode.
Signal type square and measured risetime under 5ns
Due to lack of time not measured more long periods and this may give enough confirmations for your findings.
SDG2042X period measured (gt = gate time)
10ms»»» 0, 010 000 000 02s gt 1s
100ms»» 0, 100 000 002 38 s gt 10s
1s »»»»» 1, 000 000 450 19 s gt 20s
10s»»»»10, 000 052 463 5 s gt 100s