#### defragster

##### Senior Member+

Using 'this image' giving what should be 5pF at 221 MHz

two green WW 30ga on PCB pads. 1st soldered to leg of 22pF that has WW30 shorted across to first 10pF passing through 2nd 10pF where 2nd ww30 hits 2nd pad

And just running PRand seeds 0-5 this shows:

Same 4M PRand written to Low and High 16 MB.

> INSTANT FAIL (1) is when they do not read back compare Low to High

> INSTANT FAIL (2) is when PRand math done and checked against Low and High halves and one or the other fails

> EXIT FAIL is same PRand math done and checked against Low and High halves and fails after series of repeat read back compares

Opps the second wire wasn't wrapped tight - adjusted and still on the edge? - but two runs complete like this:

two green WW 30ga on PCB pads. 1st soldered to leg of 22pF that has WW30 shorted across to first 10pF passing through 2nd 10pF where 2nd ww30 hits 2nd pad

And just running PRand seeds 0-5 this shows:

Code:

```
--- START ------
>>**>> PseudoRand(0) Seed 2976674124 with readRepeat 10 ...
PseudoRand seq. written does not match: Errors Cnt: L=1 H=0 < INSTANT FAIL (2)
>>**>> PseudoRand(1) Seed 1438200953 with readRepeat 10 ...
PseudoRand seq. written does not compare: Errors Cnt 1 < INSTANT FAIL (1)
PseudoRand seq. written does not match: Errors Cnt: L=0 H=1 < INSTANT FAIL (2)
>>**>> PseudoRand(2) Seed 3413783263 with readRepeat 10 ...
PseudoRand seq. written does not match: Errors Cnt: L=1 H=0 < EXIT FAIL
Fail pseudo-random sequence not same in both HalfCmp with seed=3413783263
Same pseudo-random sequence in both HalfCmp Compare time secs 3.95 with Error Cnt 1
>>**>> PseudoRand(3) Seed 1900517911 with readRepeat 10 ...
PseudoRand seq. written does not compare: Errors Cnt 1 < INSTANT FAIL (1)
PseudoRand seq. written does not match: Errors Cnt: L=2 H=0 < INSTANT FAIL (2)
>>**>> PseudoRand(4) Seed 1227909400 with readRepeat 10 ...
Fail pseudo-random sequence not same in both HalfCmp with seed=1227909400
Same pseudo-random sequence in both HalfCmp Compare time secs 3.95 with Error Cnt 51
```

> INSTANT FAIL (1) is when they do not read back compare Low to High

> INSTANT FAIL (2) is when PRand math done and checked against Low and High halves and one or the other fails

> EXIT FAIL is same PRand math done and checked against Low and High halves and fails after series of repeat read back compares

Opps the second wire wasn't wrapped tight - adjusted and still on the edge? - but two runs complete like this:

Code:

```
--- START ------
<edit>
Same test run at 198 MHz shows the speed change for the test from above running at 221 MHz. That is 17% faster!
[QUOTE]
>>**>> PseudoRand(3) Seed 1900517911 with readRepeat 10 ...
Same pseudo-random sequence in both HalfCmp Compare time secs 4.62 with Error Cnt 0
[/QUOTE]
>>**>> PseudoRand(0) Seed 2976674124 with readRepeat 10 ...
Same pseudo-random sequence in both HalfCmp Compare time secs 3.95 with Error Cnt 5
>>**>> PseudoRand(1) Seed 1438200953 with readRepeat 10 ...
Same pseudo-random sequence in both HalfCmp Compare time secs 3.95 with Error Cnt 0
>>**>> PseudoRand(2) Seed 3413783263 with readRepeat 10 ...
Same pseudo-random sequence in both HalfCmp Compare time secs 3.95 with Error Cnt 0
>>**>> PseudoRand(3) Seed 1900517911 with readRepeat 10 ...
Same pseudo-random sequence in both HalfCmp Compare time secs 3.95 with Error Cnt 0
>>**>> PseudoRand(4) Seed 1227909400 with readRepeat 10 ...
Same pseudo-random sequence in both HalfCmp Compare time secs 3.95 with Error Cnt 0
Total errors found 5
--- START ------
>>**>> PseudoRand(0) Seed 2976674124 with readRepeat 10 ...
Same pseudo-random sequence in both HalfCmp Compare time secs 3.95 with Error Cnt 0
>>**>> PseudoRand(1) Seed 1438200953 with readRepeat 10 ...
Same pseudo-random sequence in both HalfCmp Compare time secs 3.95 with Error Cnt 0
>>**>> PseudoRand(2) Seed 3413783263 with readRepeat 10 ...
Same pseudo-random sequence in both HalfCmp Compare time secs 3.95 with Error Cnt 0
>>**>> PseudoRand(3) Seed 1900517911 with readRepeat 10 ...
Same pseudo-random sequence in both HalfCmp Compare time secs 3.95 with Error Cnt 0
>>**>> PseudoRand(4) Seed 1227909400 with readRepeat 10 ...
Same pseudo-random sequence in both HalfCmp Compare time secs 3.95 with Error Cnt 0
Total errors found 0
```

Last edited: