WA4SWJ wrote:I finally had a few moments to fire up the 1121 and here is what I got at 1 volt output:
Hi Ed,
Those look real good. Here's my 1120 at 1V output next to yours:
- Code: Select all
Ed's Shannon's
10 Hz .0052% .020%
1kHz .0040% .015%
5kHz .0043% .014%
10kHz .0053% .016%
20kHz .0064% .012%
40kHz .0087% .017%
60kHz .0120% .017%
100kHz .0203% .025%
140kHz .0371% .040%
I printed off page 5-15 from the Boonton 1121 manual. It has table 5-13,
Residual Distortion Test Record. This seems to be a very good Boonton checkout of both the source distortion and analyzer error. Sure, we're not doing a NIST calibration here, but if somethings out of whack, this test will show it 98% of the time. I'll see which of the other tests is best for level accuracy, too.
I just used a single jumper from source to analyzer for these tests. Basically, I just:
-set the source level
-then frequency
-engaged the proper low pass filter (500kHz means none, I guess - just press the 'on' filter again to turn them all off)
-select DIST for distortion measurment then press the 'dB' button to measure in dBs
Just did this test right now and I failed 8 tests!! Just a few dBs off. Anyhow, this can be tweaked, plus I have a slew of new 5534s which should have higher performance that the stock ones (just the Japanese cheapo's from Mouser, but the datasheet shows awesome specs). But I'll just swap out the current lab one with my $69 Boonton 1120. Yes, it is ugly and missing a few 'teeth', but it just now passed all the Distortion Tests.
Shannon