After some investigation ... and with the levels from the manual, it would appear it is the YTF that is faulty ... the attenuator is fine, levels check perfectly ... I cannot imagine it is the relay, but I will check it at some point.? The response appears to be flat, so it is tracking correctly, just down in measured levels ... oh well, for my purposes, it is still useable, I can see what I need to see easily, I just need to remember the measured level is wrong!?? On the lower rang <3GHz, the levels measure perfectly correct.
Robin,
Do you have the Service Guide (08590-90316) and Component Level Information Package (5963-2591, sometimes 5963-2951)?? Both are available on the Keysight website.? They should help you trace where the amplitude drops.
--John Gord
On Thu, Oct 28, 2021 at 02:01 PM, Robin Szemeti wrote:
Hi,
?
I have an 8592L that has a level discrepancy between high and low bands ... of around 16dB, its the high band that is measuring flat, but low. ... it's not the mixer, that has been swapped for a known worker with exactly the same result (+- 0.5dB) ...? the amplitude, frequency and YTF cals complete without issue ... where to look next?
?
I bought this with a blown mixer, the upper range was down, the lower range was dead.?? Swapping the mixer for a known good one has restored the low range to full function, but the upper range still has the same low level ...
?
Ideas?
