Products > Test Equipment
My poor mans SMU - The Agilent 66311B
TheSteve:
The fan is also loud, even when running properly. The fan speed is controlled by the current drain but they don't take into account the voltage out. I am sure not much heat is generated when it's outputting 15 volts @ 3 amps but they really rev that sucker up. Pretty sure mine will get a resistor mod at some point, or possibly even a different fan.
I did add the bottom feet and the front tilting legs as I found a new set I had ordered for a different project, gives it a great look on the bench,
nctnico:
So far I have modified all my HP power supplies with temperature controlled fans except for a 6572A which has a temperature controlled fan as standard. On the lower power ones (200W) my fan control board starts to turn the fan on when the heatsink gets to 30 deg. C and have the fan run at full speed when the heatsink is at 50 deg. C. In the higher power ones (1kW) the fan control board has the fan running at a low speed when the temperature is below 30 deg. C. On the 200W models the fan only runs slowly when the PSU is loaded to the max. On the 1kW models I don't remember the fans ever going faster than the default speed. All in all I think HP designed the fans so they provide enough cooling with the air vents clogged and the fan blades encrusted in a thick layer of dust!
If the 66311B is making lots of noise I think I'll add my standard fan control board to it.
Muxr:
Mine arrived a few days ago. No knob, but it had a sticker on it which said "working". I opened it up anyways. Looked good. Fired it up and it appears to be working. Can't really test it until my connector arrives in a few days.
The VFD is good on it, not dim. The fan is loud, will need modding.
In either case, very happy with the score, thanks TheSteve!
TheSteve:
Tell me how long it takes you to remove the "JRE0016" sticker. Mine came off with enough effort, but it was quicker to trouble-shoot and fix my voltage jumpers then to remove it. Unless of course you don't mind the stickers, then leave it.
I was pondering the difference between the 66311B and the 66321B last night. I can't help but wonder if they are identical hardware with just a firmware change. The service guide for the 66311B doesn't mention the 66321B that I can find. The 66321B has the same spec's but with "battery emulation". I have already used my 66311B in place of battery when testing some lithium chargers and it worked great as a load but the official feature would be nice. You can select the model # in the CAL/config menu but I don't want to risk losing my calibration as it is very good right now.
btw, mine has ROM A.02.04 and the CAL date is 09/08/06
edit - played around a little. First I dumped the config/cal eeprom (93C86) so I had a backup. I then went into the board init menu but my firmware only allows 66311B, 66311D, 66309B and 66309D to be selected. I was able to exit without losing any cal data. So there is no other model I can select that is useful.
Factory fan in mine is a 2410RL-04W-B60
When the 66311B powers on the default "low" speed runs the fan at 8.7 volts. It will ramp up as current goes up. I added a 30 ohm resistor in series with the fan and it still starts just fine and has calmed it down some. The best solution would probably be to buy a quiet fan.
I am currently running the unit limited to 2 amps into my 34461A DCI input to see if I can get any temp rise out of the exhaust air but so far feel very little increase in temperature. Obviously sinking current will generate some heat but the fan should have no issues dealing with that.
gslick:
--- Quote from: TheSteve on February 21, 2016, 01:17:19 am ---
btw, mine has ROM A.02.04 and the CAL date is 09/08/06
edit - played around a little. First I dumped the config/cal eeprom (93C86) so I had a backup. I then went into the board init menu but my firmware only allows 66311B, 66311D, 66309B and 66309D to be selected. I was able to exit without losing any cal data. So there is no other model I can select that is useful.
--- End quote ---
Do you have the means to read and dump the ROM A.02.04 firmware? I think it's in either a 28- or 32-pin PLCC package.
I think I have either A.02.01 or A.02.02 in my 66309D supplies and there are some additional settings available in the A.02.04 firmware. (For example whether the dual supplies switch on/off together or independently). I don't know for sure the firmware is actually the same between the 66311B, 66311D, 66309B and 66309D models.
How did you dump the config/cal eeprom (93C86)?
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