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  1. HP-Agilent-Keysight-Equipment
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8594E Cal Signal not Found ?

 

After replacing battery I entered the Time Base Correction, Frequency Response Correction & Step Attenuator Corrections.
Now when I go to perform Cal Freq or Cal Amptd I’m getting a Cal Signal Not Found.
I checked the CAL OUT and I’m seeing 300.000824MHz -20dBm on my Spectrum Analyzer.
Input using an HP E4432B Signal Generator set 300MHz -20dBm I’m seeing 300.8MHz at -28dBm.
As I change the Span I get different frequency’s showing?
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Andrew
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The workaround for the "Cal Signal Not Found" error is covered in the Assembly Level Repair manual.
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If you had to reload all the correction constants, I would start with the "Analyzer Initialization" section in that manual (namely: setting DEFAULT CONFIG) and go from there, if you haven't already done so.
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-mark
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On Fri, Apr 4, 2025 at 02:51 PM, KB2LMN wrote:

After replacing battery I entered the Time Base Correction, Frequency Response Correction & Step Attenuator Corrections.
Now when I go to perform Cal Freq or Cal Amptd I’m getting a Cal Signal Not Found.
I checked the CAL OUT and I’m seeing 300.000824MHz -20dBm on my Spectrum Analyzer.
Input using an HP E4432B Signal Generator set 300MHz -20dBm I’m seeing 300.8MHz at -28dBm.
As I change the Span I get different frequency’s showing?
?
Andrew
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?
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Thanks Mark, ya I did all that but did just see this so I will try next.
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Instrument firmware expects the cal output signal to be 300 MHz ± 2 MHz.Sometimestheinstrument default data is not able to tune the cal signal within this range and a “cal signal not found” message may appear on screen. Perform a cal output bypass check by pressing Frequency,-37, Hz, Cal, Cal Freq. This will bypass the cal check and start by calibrating the sweep ramp.
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Andrew
 

Mark, my 8594E only has 2ea firmware chips U24 & U27, is this normal? Everything I seem to find about this unit says 4 chips? I was trying to see if I had the latest firmware installed.
 

Hi Andrew,
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It's ok to have 2 or 4 EEPROMs for version G (94.03.15).? You can read about the various versions and EEPROM part numbers here (original doc #08590-90324):
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The latest version according to that doc is M (991130), but the latest out there in the various archives that I'm aware of is L (980615).
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I don't recommend messing with firmware upgrades until everything is resolved with the self-cal.? One thing at a time.
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-mark
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On Fri, Apr 4, 2025 at 07:35 PM, KB2LMN wrote:

Mark, my 8594E only has 2ea firmware chips U24 & U27, is this normal? Everything I seem to find about this unit says 4 chips? I was trying to see if I had the latest firmware installed.
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I repaired an 8591A for a friend two weeks ago, and he had the same problem.

In his case, it had lost its calibration constants due to a low battery.

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What caused the signal not found or LOCK OFF SRQ110 problem was that the units after a PRESET weren't dBm but mV, and also that the flatness data was empty...no value.

For flatness, I had entered a value of -1 for the entire band.

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After fixing these two issues, I was able to run CAL FRE and CAL AMP without any problems.

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I'm not saying this is the problem with your 8594E, but out of curiosity, do either of these two cases apply to you regarding flatness and units after a PRESET?

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Yves

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Mark I did get everything working last night thank to your help I appreciate it! I ran it through some tests and it passed them all so the firmware was my next leap. Fortunately I have done some chip programming so this one should be an easy fix/ upgrade for me. I looked around and can’t find the G 980615 file for upgrade purposes.
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Again thanks for sharing your expertise it would have taken me much, much longer to figure this all out on my own.
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Andrew
 

Yves thanks for sharing that info after I read the ENTIRE how to input constants section I found at the very end a work around so I’m good now. Now I’m just looking for the newest firmware version and then I’m done with this one and onto an 8591 I picked up.
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Andrew
 

Well I believe I found the newest software
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My question is I only have 2 EPROMS in my 8594E do I need 4 or can the files be combined some how I to 2. If not I will need to pick up 2 EPROMS.
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Andrew
 

That is the latest firmware on KO4BB.
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Look at the size of the four HEX files when loaded into your programmer. ?You will need (4) 27C020-150 2Mbit (256kbyte) EEPROMs to hold them all.
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The firmware doc is wrong in saying that you need (4) 1Mbit EEPROMs. ?I think it's only true for version H (95.02.21) or older. ?And if you use anything other then 2Mbit EEPROMs, you need to restrap the EEPROM socket selects (see schematic). ?Save yourself a headache and stick with 27C020-150.
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I did the same upgrade from G to L on one of my 8595E analyzers: (2) 27C020-150 to (4) 27C020-150. ?Worked fine. ?I bought (4) 27C020-150 for the upgrade and saved the old EEPROMs in case something went wrong.
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-mark
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On Sat, Apr 5, 2025 at 01:17 PM, KB2LMN wrote:

Well I believe I found the newest software
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My question is I only have 2 EPROMS in my 8594E do I need 4 or can the files be combined some how I to 2. If not I will need to pick up 2 EPROMS.
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Andrew
 

Mark, great thanks I actually found 4 AMD AM27C020’s I will use them they state they have HP 859XE 95-09-14 on them. I kind of remember picking them up at a hamfest a few years ago and some digging was done to find them.?

Andrew
 

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The files in the folder referenced are 636KB each as hex. As binary, that should be around 512KBytes each, or 4 megabits.

I guess you could do the math on whether your two chips hold 8 megabits each.

I don't have an 859X but I am a computer guy working backwards from my phone.

I just saw an email pop up while writing this about 4x27c020. I think you’ll find the newer firmware is larger than the old and you’ll need 27c040 parts.

Being the Motorola processor begins its power up by reading from the bottom of memory address range and ram typically gets located at the top, this avoids having to remap address lines, but it also facilitates swapping larger EPROMs in so long as the sockets have enough address lines to address the entire chip.


From: [email protected] <[email protected]> on behalf of KB2LMN via groups.io <kb2lmn@...>
Sent: Saturday, April 5, 2025 12:17:18 PM
To: [email protected] <[email protected]>
Subject: Re: [HP-Agilent-Keysight-equipment] 8594E Cal Signal not Found ?
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Well I believe I found the newest software
?
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My question is I only have 2 EPROMS in my 8594E do I need 4 or can the files be combined some how I to 2. If not I will need to pick up 2 EPROMS.
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Andrew
 

Ed,
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You are incorrect on the size.? The Intel HEX format provided at KO4BB is two bytes of ASCII to be converted to one byte of binary, plus the Intel format includes some overhead for each record (length, offset, type, checksum).? There is no compression making the encoding expansion for a binary a factor of about 2.4.
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Ex for one of the image files:
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? $ srec_info 8590-u6.hex -intel
? Format: Intel Hexadecimal (MCS-86)
? Data: ? 000000 - 03FFFF
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4x 27c020 is what is needed.
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Please check your math.
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-mark
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On Sat, Apr 5, 2025 at 05:38 PM, Ed Marciniak wrote:

The files in the folder referenced are 636KB each as hex. As binary, that should be around 512KBytes each, or 4 megabits.
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I guess you could do the math on whether your two chips hold 8 megabits each.
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I don't have an 859X but I am a computer guy working backwards from my phone.
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I just saw an email pop up while writing this about 4x27c020. I think you’ll find the newer firmware is larger than the old and you’ll need 27c040 parts.
?
Being the Motorola processor begins its power up by reading from the bottom of memory address range and ram typically gets located at the top, this avoids having to remap address lines, but it also facilitates swapping larger EPROMs in so long as the sockets have enough address lines to address the entire chip.
?
..
 

I had an edit failure resulting in the wrong draft being sent. (Wipes egg off face)

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