Despite having removed all power from the D432656 SRAM to get it to function, it still remembered all of that information, so it is stored in multiple locations.
My replacement NVRAM came today, so I should have everything fixed and buttoned up before bed.
I was just reading the 11801 service manual and the Enhanced Accuracy calibration has to be done for all channels *every* time the instrument is power cycled. Which may explain the large on time hours vs power cycles that seem to be typical. It also leaves me amazed there is no screen burn.
Sampling scopes are very much a niche item, but if you need accurate timing information they are the most economical option.
In my case, I am working on FOSS DSO FW for Zynq and Cyclone V based COTS DSOs. Having LeCroy style stackable filters and math are an essential requirement. I'm not yet clear on how I'm going to get time accurate signals off the FPGA board, but my intent is to examine the timing of variable word length multiplier and adder chains for FIR and IIR filters to verify that the simulation timings are actually correct. The price point of the 8/12/14 bit AD HMCAD1520 ADCs makes limiting the FW to 8 bits foolish.
More later and thanks to all for their help.
Reg
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On Mon, 3/25/19, Jack2015 <tolkien@...> wrote:
Subject: Re: [TekScopes] 11801 diagnostic help
To:
[email protected] Date: Monday, March 25, 2019, 11:48 AM
Bob,
I think you are right,
According to
Tektronix_11801_Factory_Diagnosis_Manual,page 2,
about "Clearing NVRAM:":
the NVRAM is initialized by filling all but a
few locations with default value.
the
following are left intact after the NVRAM is reset:
numbers of instrument
power-ons(poweron?)
instrument power-on
time(uptime?)
mainfram serial
number(uid?main)
