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Re: HP8903B - Plotting from HP-IB
Thank you so much Harvey, unfortunately I don't know the Arduino, I only have experience with the PIC (eg 16F628A). But i n my research on the net I fortunately found a utility for PC which, through
By Attilio · #122450 ·
Re: HP-8753E Option Key Installation Failure
Hi Harvey: Yes, I will start looking those. I am sure there is some tutorials on YouTube that could be watched too. It is clear that it cannot read based on how the pins are set when attempting to
By Rich Miller · #122449 ·
Re: HP8903B - Plotting from HP-IB
If the outputs are analog, then an arduino doing the A/D conversion (pen lift active means ignore inputs).? Output those values on a serial data line to an off the shelf serial to USB converter and
By Harvey White · #122448 ·
HP8903B - Plotting from HP-IB
Good day everyone, I recently bought an HP8903B audio analyzer that has output terminals (X-Plot, Y-Plot, Pen Lift and GND) to connect an X-Y plotter that I don't have available. I would like to ask
By Attilio · #122447 ·
Keysight 3458A Front panel grounding clip
Hello, Has anyone found a replacement (or know the Keysight part number) for the spring metal clip that provides a ground to the front panel of the 3458A? It is a small <1 inch clip, bent in the
By victor.silva · #122446 ·
Re: Problem with HP MMS 70000, USERLOCK ON
Hi, Has anyone managed to get a copy of the HP70875A on a card? Hope to hear, thanks, Bas.
By ph0bas · #122445 ·
Re: HP-8753E Option Key Installation Failure
OK, then this gives me an idea of what you might be familiar with. I'd suggest looking for some 6800 or 6502 data sheets that include read and write timing diagrams.? Any tutorials that include
By Harvey White · #122444 ·
Re: HP-8753E Option Key Installation Failure
Hi Harvey: Thanks this is helpful information! There is, what I am pretty sure is RAM located on the same board. Based on my brief reading of the service manual while attempting to source
By Rich Miller · #122443 ·
Re: HP-8753E Option Key Installation Failure
This is shocking. I have had other HP tests equipment of the 8753E era and they were pretty well documented to include schematics. Diagnosis of the 8753E as described in the service manual very
By Rich Miller · #122442 ·
Re: HP-8753E Option Key Installation Failure
FW versions: That is only true for 8753D with the CPU upgrade option. The CLIP unfortunately only describes the original 8753D CPU board.
By Marcus Gustafsson · #122441 ·
Re: HP 8595E Restore and Tracking Generator Questions
Chad-? Check the switch with a meter when it won't power up to see if the contacts are okay.? I'd do that before going after the caps since it was working for a while. The contact lube in the some
By freshndaire · #122440 ·
Re: HP-8753E Option Key Installation Failure
The 8753D CLIP is available at ko4bb.? The 8753D takes the same latest firmware version 7.74? as the E and ES.? The processor schematic might be close enough to help you.
By nj902 · #122439 ·
Re: HP-8753E Option Key Installation Failure
Ok, the actual kind of processor is a little less important than you think.? You can pretty much interface an 8080 style (intel) chip to a motorola (68xxx) style processor with a little logic. What
By Harvey White · #122438 ·
Re: HP-8753E Option Key Installation Failure
Hi Harvey: I do not know what kind of processor just yet. I thought I got an abbreviated copy of the service manual without schematics. I am now looking at another service manual that also has no
By Rich Miller · #122437 ·
Re: HP-8753E Option Key Installation Failure
I guess none of the service manuals have a schematic for the 8753E. Anyone know of a source for these schematics? If not all them, I could use the A9 CPU board Schematic.
By Rich Miller · #122436 ·
Re: HP-8753E Option Key Installation Failure
OE is generally derived from the processor's read/write outputs (what kind of processor is it? 68xxxx series).? IIRC, it's likely a read/write level combined with a "valid memory address (i.e now do
By Harvey White · #122435 ·
Re: FM Tuner alignment generator?..
Spec for the old 8656A is 0.5% THD, but is normally much better for the internal oscillator.? You can use a low distortion external oscillator of course, and even an MPX generator.? I don't know
By bhome1959 · #122434 ·
Re: HP-8753E Option Key Installation Failure
This I do not know yet. I was able to trace OE to another chip (U402). CE and WE go off to another section of the PCB. Need pull down a schematic and have a closer look. The service manual I
By Rich Miller · #122433 ·
Re: HP-8753E Option Key Installation Failure
Looks like the idea of trying to read it, then putting a new one in is a good thought, however, what's driving the WE?? Is there a lockout we don't know of? You may have a fragile EEPROM, but the
By Harvey White · #122432 ·
Re: HP-8753E Option Key Installation Failure
Hi Harvey: Well the results are not good: STANDBY: CE = 4V - Should be between 4.5 - 5.5V OE= Cycles between 0 - 4.5V (Like there is data on this pin) WE= 5V WRITE: Tested when attempting to write
By Rich Miller · #122431 ·