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 Tue Sep 15 15:10:48 2015, gautam, ericq, rana, Summary, LSC, PRFPMI lock & various to-do's 
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 Tue Sep 15 18:35:21 2015, ericq, Summary, LSC, some further notes
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Tue Sep 15 20:44:13 2015, gautam, Summary, LSC, Checking the delay line phase shifter DS050339
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Thu Sep 17 03:48:10 2015, ericq, Summary, LSC, some further notes
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Thu Sep 17 13:06:05 2015, ericq, Summary, LSC, Low input impedance on CM board
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Message ID: 11603
Entry time: Tue Sep 15 20:44:13 2015
In reply to: 11601
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| Author: |
gautam |
| Type: |
Summary |
| Category: |
LSC |
| Subject: |
Checking the delay line phase shifter DS050339 |
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I checked out the delay line phase shifter D050339, (theory of operation here) this afternoon. I first checked that the power connection was functional, which it was, though the power connector is is not the usual chassis one (see image attached, do we need to change this?).
The box has two modes of operation - you can either change the delay by flipping switches on the front panel or via a 25pin D-sub connector on the back (the pin numberings for this connector on the datasheet are a little misleading, but I determined that pins 1-9 on the D-sub connector correspond to the 9 delays on the front panel in ascending order, pin 10 is the mode selector switch, should be high for remote operation, pins 11 and 13 are NC, pin 12 is VCC of 5V, and pins 14-25 are grounded). I first checked the front-panel mode of operation, using an oscilloscope to measure the delay between the direct signal from the Fluke 6061 and the output from the D050339. This corresponds to the first set of datapoints in the plot attached (signal was 100MHz sine wave).
I then used a 25 pin D sub breakout boards to check the remote operation mode as well, which corresponds to the second set of datapoints in the plot attached. For this measurement, I used the Agilent network analyzer to measure the phase lag between the direct signal (for all delays, I measured the phase lag at 100MHz, having first calibrated the "thru" path by connecting the R and A inputs of the network analyzer using a barrel BNC) and the delayed output from the box, and then converted it to a time delay.
Both sets of data are linear, with a slope nearly equal to 1 as expected. I conclude that the box is functioning as expected. Right now, Koji is checking a board which will be used to remotely control this box. On the hardware side it remains to make a cable going from the DS050339 Dsub input to the driver board output (also 25 pin Dsub). |
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