Re: HP 8593e alimentation A8
hi, George, I find this circuit diagram comes from 08563-60064.
My HP8592L PSU £¨5062-8229£© was bad to. all the LED is off¡£?I doubt on swtiching board Q140 4N50E and SMD bord U302 LP339¡£ the Q140 4N50E? gate pin connect the SMD board LP339 pin2 (out)£¬ only 0.9V and also zenner nearby¡£? LP339 Vcc is 15V from zenner VR110 is ok.
the? LP339 comparator connect some transistor(?)and no circuit ,so I cannot check more.? pls do you have any idea?? ?
thx
de BG8AAK
China
|
Dave All very good answers and most likely you will find an issue in the oven. I just recovered a 5061 some 8 months ago now. I hope your luck is better then mine. The oven overheated?and melted the higher oven voltage 28V to the 20 V supply (May have the voltages wrong) But the damage was pretty bad. Several lucky things. The way the logic works in the 5061 is if the ion current is high it prevents a number of modules from turning on. This saved me multiple module repairs. Luck was further with me in that a number of years ago I had picked up 3 5061 or 5360 crystal ovens for little. I simply replaced the oven and have not repaired the original. The?burnt smell is pretty bad. But also requires one heck of a repair job. Its a winter project if the smell has tamed down. And indeed the thermal fuse is also bad. Good luck. Regards Paul WB8TSL
|
I found myself in exactly the same situation several years ago. If you have the same problem (probable) it is xtal drift (though 400 HZ seems a bit high). The problem is the 5061 xtal oscillator runs all the time whether the CS tube is on or off. So if you run it with the CS off for some time there is a possibility of the xtal drifting out of the lock range. When was the last time (before the failure) that you looked at the correction voltage. It is a good tihig to keep a log on.
If you don't keep it plugged in,then maybe it is an electrical problem in the xtal osc, but if it is always plugged in, more likely drift.
Cheers!
Bruce
Quoting Dave McGuire <mcguire@...>:
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I have a 5061A Cs-beam oscillator that was working great, in very occasional use. One day recently it refused to lock.
A quick glance through the important stuff showed that the 5MHz oscillator, with the loop open, in "Cs off" mode, was about 100Hz high. I believe this is well outside the PLL capture range.
Not stopping to think much, I cranked the coarse 5MHz oscillator frequency adjustment down. It hit the end of its travel with the oscillator's output still being 40Hz high.
Before I start digging in, can anyone offer any thoughts as to what may have happened to the oscillator? I had been performing flawlessly until now, but I'd not checked its output in probably nine months, so I don't know if the frequency drifted high, or if it "jumped".
Any advice or thoughts on this would be greatly appreciated.
Thanks,
-Dave
--
Dave McGuire, AK4HZ
New Kensington, PA
|
Hi Dave,
I have a 00105-6013 oscillator here that was removed from a junked 5061A. You're welcome to if for the cost of shipping
BUT - I'm in the most severely locked down state in Australia and can't get to a post office for at least another 3 weeks maybe. Even once I do, our postal service is absolutely terrible at the moment so shipping time could be weeks.
If you can tolerate the wait let me know and I'll pack it ready for when I can send it.
On the other issue, I don't think leaving the ion pump off for a few weeks will be a problem. My 5061A was in storage for a few years before I resurrected it and it works just fine.
73,? Morris Odell VK3DOC
|
Everyone needs a GPSDO.
There is a schematic for the 105 in the 5061A manual 05061-9052.
The 10811A, when used in the 5061B (and some later versions of the 5061A, I think), was divided to 5 MHz (if I recall correctly) for use in frequency control. However, the 5061B did offer 10 MHz output on the front panel whereas the 5061A only offered a maximum of 5 MHz.
Good luck.
Joe
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-----Original Message----- From: [email protected] [mailto: [email protected]] On Behalf Of Dave McGuire Sent: Friday, September 11, 2020 5:32 PM To: [email protected]Subject: Re: [HP-Agilent-Keysight-equipment] 5061A advice sought My central lab standard, a locked HP Z3801A GPSDO. -Dave On 9/11/20 6:24 PM, Jim Ford wrote: Sooo, what are you measuring against?
Jim Ford
Sent from my Verizon, Samsung Galaxy smartphone
-------- Original message --------
From: Dave McGuire <mcguire@...>
Date: 9/11/20 2:41 PM (GMT-08:00)
To: [email protected]
Subject: [HP-Agilent-Keysight-equipment] 5061A advice sought
I have a 5061A Cs-beam oscillator that was working great, in very
occasional use. One day recently it refused to lock.
A quick glance through the important stuff showed that the 5MHz
oscillator, with the loop open, in "Cs off" mode, was about 100Hz high.
I believe this is well outside the PLL capture range.
Not stopping to think much, I cranked the coarse 5MHz oscillator
frequency adjustment down. It hit the end of its travel with the
oscillator's output still being 40Hz high.
Before I start digging in, can anyone offer any thoughts as to what
may have happened to the oscillator? I had been performing flawlessly
until now, but I'd not checked its output in probably nine months, so I
don't know if the frequency drifted high, or if it "jumped".
Any advice or thoughts on this would be greatly appreciated.
Thanks,
-Dave
--
Dave McGuire, AK4HZ
New Kensington, PA
-- Dave McGuire, AK4HZ New Kensington, PA
|
Re: E4418B modification information for the stand by battery
Hi Paul,
I have just uploaded the E4418B-07A Service Note for the battery drain issue to a folder "VA7OJ Files" which I added to the Files section.
73, Adam VA7OJ/AB4OJ
|
Adam Farson added folder /VA7OJ Files
The following files have been uploaded to
the Files area of the [email protected] group.
By: Adam Farson
Description:
Service Note E4418B-07A: Modification to E4418B power meter to correct excessive drain on lithium battery BT1
|
Makes sense.
Jim
Sent from my Verizon, Samsung Galaxy smartphone
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-------- Original message -------- From: Dave McGuire <mcguire@...> Date: 9/11/20 3:32 PM (GMT-08:00) Subject: Re: [HP-Agilent-Keysight-equipment] 5061A advice sought
?? My central lab standard, a locked HP Z3801A GPSDO. ?????????? -Dave On 9/11/20 6:24 PM, Jim Ford wrote: > Sooo, what are you measuring against? > > Jim Ford > > > > Sent from my Verizon, Samsung Galaxy smartphone > > -------- Original message -------- > From: Dave McGuire <mcguire@...> > Date: 9/11/20 2:41 PM (GMT-08:00) > To: [email protected]> Subject: [HP-Agilent-Keysight-equipment] 5061A advice sought > > >? ?? I have a 5061A Cs-beam oscillator that was working great, in very > occasional use.? One day recently it refused to lock. > >? ?? A quick glance through the important stuff showed that the 5MHz > oscillator, with the loop open, in "Cs off" mode, was about 100Hz high. > I believe this is well outside the PLL capture range. > >? ?? Not stopping to think much, I cranked the coarse 5MHz oscillator > frequency adjustment down.? It hit the end of its travel with the > oscillator's output still being 40Hz high. > >? ?? Before I start digging in, can anyone offer any thoughts as to what > may have happened to the oscillator?? I had been performing flawlessly > until now, but I'd not checked its output in probably nine months, so I > don't know if the frequency drifted high, or if it "jumped". > >? ?? Any advice or thoughts on this would be greatly appreciated. > >? ????????????? Thanks, >? ????????????? -Dave > > -- > Dave McGuire, AK4HZ > New Kensington, PA > > > > -- Dave McGuire, AK4HZ New Kensington, PA
|
My central lab standard, a locked HP Z3801A GPSDO.
-Dave
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On 9/11/20 6:24 PM, Jim Ford wrote: Sooo, what are you measuring against?
Jim Ford
Sent from my Verizon, Samsung Galaxy smartphone
-------- Original message --------
From: Dave McGuire <mcguire@...>
Date: 9/11/20 2:41 PM (GMT-08:00)
To: [email protected]
Subject: [HP-Agilent-Keysight-equipment] 5061A advice sought
?? I have a 5061A Cs-beam oscillator that was working great, in very
occasional use.? One day recently it refused to lock.
?? A quick glance through the important stuff showed that the 5MHz
oscillator, with the loop open, in "Cs off" mode, was about 100Hz high.
I believe this is well outside the PLL capture range.
?? Not stopping to think much, I cranked the coarse 5MHz oscillator
frequency adjustment down.? It hit the end of its travel with the
oscillator's output still being 40Hz high.
?? Before I start digging in, can anyone offer any thoughts as to what
may have happened to the oscillator?? I had been performing flawlessly
until now, but I'd not checked its output in probably nine months, so I
don't know if the frequency drifted high, or if it "jumped".
?? Any advice or thoughts on this would be greatly appreciated.
????????????? Thanks,
????????????? -Dave
--
Dave McGuire, AK4HZ
New Kensington, PA
--
Dave McGuire, AK4HZ
New Kensington, PA
|
Sooo, what are you measuring against?
Jim Ford?
Sent from my Verizon, Samsung Galaxy smartphone
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-------- Original message -------- From: Dave McGuire <mcguire@...> Date: 9/11/20 2:41 PM (GMT-08:00) Subject: [HP-Agilent-Keysight-equipment] 5061A advice sought
?? I have a 5061A Cs-beam oscillator that was working great, in very occasional use.? One day recently it refused to lock. ?? A quick glance through the important stuff showed that the 5MHz oscillator, with the loop open, in "Cs off" mode, was about 100Hz high. I believe this is well outside the PLL capture range. ?? Not stopping to think much, I cranked the coarse 5MHz oscillator frequency adjustment down.? It hit the end of its travel with the oscillator's output still being 40Hz high. ?? Before I start digging in, can anyone offer any thoughts as to what may have happened to the oscillator?? I had been performing flawlessly until now, but I'd not checked its output in probably nine months, so I don't know if the frequency drifted high, or if it "jumped". ?? Any advice or thoughts on this would be greatly appreciated. ????????????? Thanks, ????????????? -Dave -- Dave McGuire, AK4HZ New Kensington, PA
|
The OCXO oven is definitely powered when in "Cs off". Ok, I will power it down at least for the removal and de-wiring of the OCXO.
-Dave
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On 9/11/20 6:16 PM, John Ackermann N8UR wrote: I *think* that the oven is powered even when in "CS OFF" mode.? So to be safe, I would remove power Just In Case.? But dropping the ion pump for a little while shouldn't have any impact.
On 9/11/20 6:14 PM, Dave McGuire wrote:
?? This one has the 00105-6013 oscillator, similar the one used in the 105B quartz standard.? Think it's safe to yank that out to work on it, and keep the 5061A powered for the ion pump?
?? I should probably take this opportunity to replace the battery while it's out of the rack.
??????????? -Dave
On 9/11/20 5:49 PM, John Ackermann N8UR wrote:
Is it the newer 10811A oscillator, or the older one (can't remember the number right now)?? They have different oven circuits.? But yes, it's been known to happen.? In particular, there's a thermal fuse that can give out.? Careful disassembly of the outer case will get you to it.
John
----
On 9/11/20 5:46 PM, Dave McGuire wrote:
?? Hmm, as in no longer heating?? That would make sense.? Is there a common failure mode?
?? I'll de-rack it over the weekend.
??????????? -Dave
On 9/11/20 5:44 PM, John Ackermann N8UR wrote:
For that big an offset, I'd suspect the oven in the OCXO.
John
On Sep 11, 2020, at 5:41 PM, Dave McGuire <mcguire@... <mailto:mcguire@...>> wrote:
??????? I have a 5061A Cs-beam oscillator that was working great, in very
??? occasional use.? One day recently it refused to lock.
??????? A quick glance through the important stuff showed that the 5MHz
??? oscillator, with the loop open, in "Cs off" mode, was about 100Hz high.
??? I believe this is well outside the PLL capture range.
??????? Not stopping to think much, I cranked the coarse 5MHz oscillator
??? frequency adjustment down.? It hit the end of its travel with the
??? oscillator's output still being 40Hz high.
??????? Before I start digging in, can anyone offer any thoughts as to what
??? may have happened to the oscillator?? I had been performing flawlessly
??? until now, but I'd not checked its output in probably nine months, so I
??? don't know if the frequency drifted high, or if it "jumped".
??????? Any advice or thoughts on this would be greatly appreciated.
?????????????????? Thanks,
?????????????????? -Dave
--
Dave McGuire, AK4HZ
New Kensington, PA
|
That's not the one that was used in the 5061A, though it was the predecessor of the 10811A in...I think just about everything else.
-Dave
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On 9/11/20 6:04 PM, Stephen Hanselman wrote: The older one is the 10544A, but he mentioned the 5MHz osc. ?Hard to say which one that is. ?I have seen ¡°orange drop¡± Tant caps take out the fuse in many of the ¡°wire¡± heater versions.
Regards,
Stephen Hanselman
Datagate Systems, LLC
On Sep 11, 2020, at 14:50, John Ackermann N8UR <jra@...> wrote:
?Is it the newer 10811A oscillator, or the older one (can't remember the number right now)? ?They have different oven circuits. ?But yes, it's been known to happen. ?In particular, there's a thermal fuse that can give out. ?Careful disassembly of the outer case will get you to it.
John
----
On 9/11/20 5:46 PM, Dave McGuire wrote:
? Hmm, as in no longer heating?? That would make sense.? Is there a common failure mode?
? I'll de-rack it over the weekend.
?????????? -Dave
On 9/11/20 5:44 PM, John Ackermann N8UR wrote:
For that big an offset, I'd suspect the oven in the OCXO.
John
On Sep 11, 2020, at 5:41 PM, Dave McGuire <mcguire@... <mailto:mcguire@...>> wrote:
??????? I have a 5061A Cs-beam oscillator that was working great, in very
??? occasional use.? One day recently it refused to lock.
??????? A quick glance through the important stuff showed that the 5MHz
??? oscillator, with the loop open, in "Cs off" mode, was about 100Hz high.
??? I believe this is well outside the PLL capture range.
??????? Not stopping to think much, I cranked the coarse 5MHz oscillator
??? frequency adjustment down.? It hit the end of its travel with the
??? oscillator's output still being 40Hz high.
??????? Before I start digging in, can anyone offer any thoughts as to what
??? may have happened to the oscillator?? I had been performing flawlessly
??? until now, but I'd not checked its output in probably nine months, so I
??? don't know if the frequency drifted high, or if it "jumped".
??????? Any advice or thoughts on this would be greatly appreciated.
?????????????????? Thanks,
?????????????????? -Dave
--
Dave McGuire, AK4HZ
New Kensington, PA
|
I *think* that the oven is powered even when in "CS OFF" mode. So to be safe, I would remove power Just In Case. But dropping the ion pump for a little while shouldn't have any impact.
toggle quoted message
Show quoted text
On 9/11/20 6:14 PM, Dave McGuire wrote: ? This one has the 00105-6013 oscillator, similar the one used in the 105B quartz standard.? Think it's safe to yank that out to work on it, and keep the 5061A powered for the ion pump?
? I should probably take this opportunity to replace the battery while it's out of the rack.
?????????? -Dave
On 9/11/20 5:49 PM, John Ackermann N8UR wrote:
Is it the newer 10811A oscillator, or the older one (can't remember the number right now)?? They have different oven circuits.? But yes, it's been known to happen.? In particular, there's a thermal fuse that can give out.? Careful disassembly of the outer case will get you to it.
John
----
On 9/11/20 5:46 PM, Dave McGuire wrote:
?? Hmm, as in no longer heating?? That would make sense.? Is there a common failure mode?
?? I'll de-rack it over the weekend.
??????????? -Dave
On 9/11/20 5:44 PM, John Ackermann N8UR wrote:
For that big an offset, I'd suspect the oven in the OCXO.
John
On Sep 11, 2020, at 5:41 PM, Dave McGuire <mcguire@... <mailto:mcguire@...>> wrote:
??????? I have a 5061A Cs-beam oscillator that was working great, in very
??? occasional use.? One day recently it refused to lock.
??????? A quick glance through the important stuff showed that the 5MHz
??? oscillator, with the loop open, in "Cs off" mode, was about 100Hz high.
??? I believe this is well outside the PLL capture range.
??????? Not stopping to think much, I cranked the coarse 5MHz oscillator
??? frequency adjustment down.? It hit the end of its travel with the
??? oscillator's output still being 40Hz high.
??????? Before I start digging in, can anyone offer any thoughts as to what
??? may have happened to the oscillator?? I had been performing flawlessly
??? until now, but I'd not checked its output in probably nine months, so I
??? don't know if the frequency drifted high, or if it "jumped".
??????? Any advice or thoughts on this would be greatly appreciated.
?????????????????? Thanks,
?????????????????? -Dave
|
This one has the 00105-6013 oscillator, similar the one used in the 105B quartz standard. Think it's safe to yank that out to work on it, and keep the 5061A powered for the ion pump?
I should probably take this opportunity to replace the battery while it's out of the rack.
-Dave
toggle quoted message
Show quoted text
On 9/11/20 5:49 PM, John Ackermann N8UR wrote: Is it the newer 10811A oscillator, or the older one (can't remember the number right now)?? They have different oven circuits.? But yes, it's been known to happen.? In particular, there's a thermal fuse that can give out.? Careful disassembly of the outer case will get you to it.
John
----
On 9/11/20 5:46 PM, Dave McGuire wrote:
?? Hmm, as in no longer heating?? That would make sense.? Is there a common failure mode?
?? I'll de-rack it over the weekend.
??????????? -Dave
On 9/11/20 5:44 PM, John Ackermann N8UR wrote:
For that big an offset, I'd suspect the oven in the OCXO.
John
On Sep 11, 2020, at 5:41 PM, Dave McGuire <mcguire@... <mailto:mcguire@...>> wrote:
??????? I have a 5061A Cs-beam oscillator that was working great, in very
??? occasional use.? One day recently it refused to lock.
??????? A quick glance through the important stuff showed that the 5MHz
??? oscillator, with the loop open, in "Cs off" mode, was about 100Hz high.
??? I believe this is well outside the PLL capture range.
??????? Not stopping to think much, I cranked the coarse 5MHz oscillator
??? frequency adjustment down.? It hit the end of its travel with the
??? oscillator's output still being 40Hz high.
??????? Before I start digging in, can anyone offer any thoughts as to what
??? may have happened to the oscillator?? I had been performing flawlessly
??? until now, but I'd not checked its output in probably nine months, so I
??? don't know if the frequency drifted high, or if it "jumped".
??????? Any advice or thoughts on this would be greatly appreciated.
?????????????????? Thanks,
?????????????????? -Dave
--
Dave McGuire, AK4HZ
New Kensington, PA
|
Re: Hewlett Packard 5335A Universal Frequency Counter Fail Massage 5.1
Read this thread over on EEVblog start to finish:
Pay particular attention to comments about the power supplies and relay/relay socket.
Then check the power supplies.
5335As will act really goofy if the relay socket is about to fail so you have to make sure it's OK before you do any other troubleshooting.
Orin.
Hello Everyone I have a Hewlett Packard 5335A Universal Frequency Counter
With Fail Massage 5.1 when Powered on, according to the manual it is
Start Interpolator Problem, I have tried to trace the problem but no luck
I hope that some one has some experience with this counter and can
Point me in the right direction Thank You I am looking forward to hear
from a knowledgeable individual that is more knowledgeable I
Thank You
Sal C. Cornacchia
RF Microwave Engineer (Ret.)
|
The older one is the 10544A, but he mentioned the 5MHz osc. ?Hard to say which one that is. ?I have seen ¡°orange drop¡± Tant caps take out the fuse in many of the ¡°wire¡± heater versions.? Regards, ? Stephen Hanselman Datagate Systems, LLC
toggle quoted message
Show quoted text
On Sep 11, 2020, at 14:50, John Ackermann N8UR <jra@...> wrote:
? Is it the newer 10811A oscillator, or the older one (can't remember the number right now)? ?They have different oven circuits. ?But yes, it's been known to happen. ?In particular, there's a thermal fuse that can give out. ?Careful disassembly of the outer case will get you to it.John----On 9/11/20 5:46 PM, Dave McGuire wrote: ? Hmm, as in no longer heating?? That would make sense.? Is there a common failure mode?
? I'll de-rack it over the weekend.
?????????? -Dave
On 9/11/20 5:44 PM, John Ackermann N8UR wrote:
For that big an offset, I'd suspect the oven in the OCXO.
John
On Sep 11, 2020, at 5:41 PM, Dave McGuire <mcguire@... <mailto:mcguire@...>> wrote:
??????? I have a 5061A Cs-beam oscillator that was working great, in very
??? occasional use.? One day recently it refused to lock.
??????? A quick glance through the important stuff showed that the 5MHz
??? oscillator, with the loop open, in "Cs off" mode, was about 100Hz high.
??? I believe this is well outside the PLL capture range.
??????? Not stopping to think much, I cranked the coarse 5MHz oscillator
??? frequency adjustment down.? It hit the end of its travel with the
??? oscillator's output still being 40Hz high.
??????? Before I start digging in, can anyone offer any thoughts as to what
??? may have happened to the oscillator?? I had been performing flawlessly
??? until now, but I'd not checked its output in probably nine months, so I
??? don't know if the frequency drifted high, or if it "jumped".
??????? Any advice or thoughts on this would be greatly appreciated.
?????????????????? Thanks,
?????????????????? -Dave
|
Is it the newer 10811A oscillator, or the older one (can't remember the number right now)? They have different oven circuits. But yes, it's been known to happen. In particular, there's a thermal fuse that can give out. Careful disassembly of the outer case will get you to it.
John
----
toggle quoted message
Show quoted text
On 9/11/20 5:46 PM, Dave McGuire wrote: ? Hmm, as in no longer heating?? That would make sense.? Is there a common failure mode?
? I'll de-rack it over the weekend.
?????????? -Dave
On 9/11/20 5:44 PM, John Ackermann N8UR wrote:
For that big an offset, I'd suspect the oven in the OCXO.
John
On Sep 11, 2020, at 5:41 PM, Dave McGuire <mcguire@... <mailto:mcguire@...>> wrote:
??????? I have a 5061A Cs-beam oscillator that was working great, in very
??? occasional use.? One day recently it refused to lock.
??????? A quick glance through the important stuff showed that the 5MHz
??? oscillator, with the loop open, in "Cs off" mode, was about 100Hz high.
??? I believe this is well outside the PLL capture range.
??????? Not stopping to think much, I cranked the coarse 5MHz oscillator
??? frequency adjustment down.? It hit the end of its travel with the
??? oscillator's output still being 40Hz high.
??????? Before I start digging in, can anyone offer any thoughts as to what
??? may have happened to the oscillator?? I had been performing flawlessly
??? until now, but I'd not checked its output in probably nine months, so I
??? don't know if the frequency drifted high, or if it "jumped".
??????? Any advice or thoughts on this would be greatly appreciated.
?????????????????? Thanks,
?????????????????? -Dave
|
Hmm, as in no longer heating? That would make sense. Is there a common failure mode?
I'll de-rack it over the weekend.
-Dave
toggle quoted message
Show quoted text
On 9/11/20 5:44 PM, John Ackermann N8UR wrote: For that big an offset, I'd suspect the oven in the OCXO.
John
On Sep 11, 2020, at 5:41 PM, Dave McGuire <mcguire@... <mailto:mcguire@...>> wrote:
I have a 5061A Cs-beam oscillator that was working great, in very
occasional use. One day recently it refused to lock.
A quick glance through the important stuff showed that the 5MHz
oscillator, with the loop open, in "Cs off" mode, was about 100Hz high.
I believe this is well outside the PLL capture range.
Not stopping to think much, I cranked the coarse 5MHz oscillator
frequency adjustment down. It hit the end of its travel with the
oscillator's output still being 40Hz high.
Before I start digging in, can anyone offer any thoughts as to what
may have happened to the oscillator? I had been performing flawlessly
until now, but I'd not checked its output in probably nine months, so I
don't know if the frequency drifted high, or if it "jumped".
Any advice or thoughts on this would be greatly appreciated.
Thanks,
-Dave
--
Dave McGuire, AK4HZ
New Kensington, PA
|
For that big an offset, I'd suspect the oven in the OCXO.
John
On Sep 11, 2020, at 5:41 PM, Dave McGuire < mcguire@...> wrote:
I have a 5061A Cs-beam oscillator that was working great, in very
occasional use. One day recently it refused to lock.
A quick glance through the important stuff showed that the 5MHz
oscillator, with the loop open, in "Cs off" mode, was about 100Hz high.
I believe this is well outside the PLL capture range.
Not stopping to think much, I cranked the coarse 5MHz oscillator
frequency adjustment down. It hit the end of its travel with the
oscillator's output still being 40Hz high.
Before I start digging in, can anyone offer any thoughts as to what
may have happened to the oscillator? I had been performing flawlessly
until now, but I'd not checked its output in probably nine months, so I
don't know if the frequency drifted high, or if it "jumped".
Any advice or thoughts on this would be greatly appreciated.
Thanks,
-Dave
|
I have a 5061A Cs-beam oscillator that was working great, in very occasional use. One day recently it refused to lock.
A quick glance through the important stuff showed that the 5MHz oscillator, with the loop open, in "Cs off" mode, was about 100Hz high. I believe this is well outside the PLL capture range.
Not stopping to think much, I cranked the coarse 5MHz oscillator frequency adjustment down. It hit the end of its travel with the oscillator's output still being 40Hz high.
Before I start digging in, can anyone offer any thoughts as to what may have happened to the oscillator? I had been performing flawlessly until now, but I'd not checked its output in probably nine months, so I don't know if the frequency drifted high, or if it "jumped".
Any advice or thoughts on this would be greatly appreciated.
Thanks,
-Dave
--
Dave McGuire, AK4HZ
New Kensington, PA
|
Adam Farson
Dave McGuire