I have this equipment in need of repair. The frequency output is working fine except for its voltage level. For example when I set a voltage AC level of 1V, I only got 0.981 Vac, no matter which potentiometers I suspect is relevant.
Of course its difficult to find schematics and manuals for this OEM even from the WEB.
Any advise from members out there will be much appreciated. Thanks much.
Of course its difficult to find schematics and manuals for this OEM even from the WEB.
Any advise from members out there will be much appreciated. Thanks much.
This is the most info I could find: https://technicalaudio.com/pdf/Bruel&Kjaer/Bruel&Kjaer_Signal_Generators_Sine_Noise_1049_1051.pdf I have not seen a manual for something similar that you could extrapolate from. FWIW this is the best source I have found for B&K manuals: https://pearl-hifi.com/06_Lit_Archive/15_Mfrs_Publications/10_Bruel_Kjaer/03_Instruction_Manuals/ Is the 5V off similarly? The error is less than 2%. Do you know your meter is accurate?
Thank you for your reply.
I have the technical info on the 1049 and 1051. I will look into the archive you mentioned. I used the 3458A and HP 34401. Both are calibrated.
There are parts I see which I cannot find information about. One in the 16 pins IC with markings Calogic DM 2014 N and the other one is cylindrical about 20mm dia by 20mm height silver in colour with markings FT14214002-2 B&K LB 1136 0.5KVDC E K 1995-01, which I think is a custom-made inductive filter. Both are found in the Output Amplifier module.
I have the technical info on the 1049 and 1051. I will look into the archive you mentioned. I used the 3458A and HP 34401. Both are calibrated.
There are parts I see which I cannot find information about. One in the 16 pins IC with markings Calogic DM 2014 N and the other one is cylindrical about 20mm dia by 20mm height silver in colour with markings FT14214002-2 B&K LB 1136 0.5KVDC E K 1995-01, which I think is a custom-made inductive filter. Both are found in the Output Amplifier module.
Can you share a picture of the PCB? it may help. The silver cylinder will be an output transformer. Calogic http://calogic.net/about-us/history-mission-statement/ should be able to provide a datasheet on the chip. It may be a multiple transistor or a custom amp. Have you looked for software/drivers for the unit?
Thank you 1audio for your reply and information.
Here are the pictures. The first pic is of the whole Output Amplifier. The second one is the close up of the portion I am going to zoom in. The reason for this is because the output level changes only when I tweek the variac C3. I agree that the Calogic chip could be those you mentioned or transistor switches. I don't see any relays being used in the unit. I will look into the link you provided. And, no, I have not gone to the stage of looking for software/drivers yet.
Here are the pictures. The first pic is of the whole Output Amplifier. The second one is the close up of the portion I am going to zoom in. The reason for this is because the output level changes only when I tweek the variac C3. I agree that the Calogic chip could be those you mentioned or transistor switches. I don't see any relays being used in the unit. I will look into the link you provided. And, no, I have not gone to the stage of looking for software/drivers yet.
Attachments
I can do no better than the HP 3458A or 34401. These equipment have excellent specs.
I just checked the specs on the 1051. The do not have an absolute spec. They have a relative spec which is pretty tight +/- .2% but no absolute spec. The silver cylinder is an output transformer. The section next to the output has 3 L/C low pass filters, probably to neet the harmonic spec. There are a handful of trimpots but without real documentation you could further degrade the calibration and accuracy. I suspect the instrument is in spec. (especially since they don't have one for output voltage). What is your application? Maybe this is not well suited to it.
Attachments
Thanks again 1audio for your inputs.
We use this equipment to test devices. So the specs must be good. I will find time to trace the signal paths and check the amplifier circuits. So it will take some time without any access to schematics. Furthermore, I did not receive any help from B&K archive with regards to 2014 pin out.
We use this equipment to test devices. So the specs must be good. I will find time to trace the signal paths and check the amplifier circuits. So it will take some time without any access to schematics. Furthermore, I did not receive any help from B&K archive with regards to 2014 pin out.
Does that mean you have previously used the instrument and recorded results. Did the output level change at some stage?
Post 1 : I doubt the unit is "in need of repair". 0.981V is only 0.17dB down from the nominal 1V.
This small deviation can probably be explained by a damage of the 50 Ohms output resistor (OK,
this can be called a repair case). Instrument readout is "based on no-load condition". I am sure
you have the knowledge to check this.
My advice is not to touch any of the trimpots without having the full service manual.
Post 4 : I am sorry to disagree with Demian, but the transformer surely is not an output device.
Brüel & Kjaer stopped using these at the end of the tube era.
This small deviation can probably be explained by a damage of the 50 Ohms output resistor (OK,
this can be called a repair case). Instrument readout is "based on no-load condition". I am sure
you have the knowledge to check this.
My advice is not to touch any of the trimpots without having the full service manual.
Post 4 : I am sorry to disagree with Demian, but the transformer surely is not an output device.
Brüel & Kjaer stopped using these at the end of the tube era.
Aside to trobbins, the unit was used by someone else. There was a change that was why it was sent to me.
Thank you as_audio, your advise is a good one. I have been busy with other chores so your information is a timely one. I will carry out as you mentioned.
Thank you as_audio, your advise is a good one. I have been busy with other chores so your information is a timely one. I will carry out as you mentioned.
I suspect the DM2014 is a Dmos switch. They are used a lot in that instrument. This is Calogic's current version of the same part I suspect: http://calogic.net/wp-content/uploads/2019/03/SD5501_Datasheet_Rev_A.pdf
I'm not sure what that transformer's function might be. A picture of the back side of the board and which connector goes to the main output will illuminate a lot.
The HP meters are about as good as you can get.
It would be extremely nice to see an (output) transformer with the bandwidth this instrument has.
The AP is 10 Hz to 204KHz with its output transformer but getting to .2 HZ with a transformer is not happening.
This guy hasnthe manual in pdf https://www.meansshop.club/detail/Bruel-Kjaer-Manuals-In-Pdf-Format_tlv254a15328241.html
Interesting. Yes, more than one list after another and 1051 included. .
This is generated from Ebay 404124387995 .
https://www.ebay.com/itm/404124387995
The seller is not currently offering anything on Ebay.
On bottom you can read :
Auction is for ONE manual listed here! Please select the type number from the list you want!
This is generated from Ebay 404124387995 .
https://www.ebay.com/itm/404124387995
The seller is not currently offering anything on Ebay.
On bottom you can read :
Auction is for ONE manual listed here! Please select the type number from the list you want!