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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?
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Andrew
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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

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