Does Composite, Component Waveform and Vector/Diamond display.. Plus,? Time Code, Audio, and SCH.. SCH is an option board...
I don't know if this forum supports pictures... if it does, here is what a good SCH Display looks like.....
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On 12/5/2017 9:21 PM, Chuck Harris wrote:
Obviously.
I was simply expanding on what you stated to include the early
2465B and 2465A. I can't say that I have ever run into the
1700 series.. Isn't it a vector scope, or something like that?
-Chuck Harris
Jan J wrote:
Also, the Tek 1700 series relies on battery within 1225 only... no other battery...
On 12/5/2017 9:29 AM, Chuck Harris wrote:
The Ramtron 16W08 family works very well in the 2465A and B
as both a replacement for the Dallas 1225, and as a replacement
for the battery and CMOS RAM in the "A" and early "B" scopes.
However...
Be warned that some EPROM programmers don't prime the pump
correctly with the FRAM chips. The CS is an address latch signal,
not a simple bus enable as it is with most RAM chips. This can mean
that your first, and last address will be in error, even though each
additional address will be fine.
In the 2465A or B scopes, the NVRAM is used as both an area to store
constants, and as system RAM. The system RAM controls the first
addresses as part of the interrupt vector array, and as such it is
restored every time the scope is powered up. Other instruments may
not do this.
To make the FRAM chips work happily in a scope with a separate battery
and CMOS RAM, you have to modify the battery test circuitry to fool
it into thinking the battery is always good.
( Short CR2371 and CR2370, replace CR2770 with 3.9K resistor, remove
battery, jumper + pad to - pad, install label over battery footprint
disclosing modification.)
-Chuck Harris
