Based on IC date codes, the tips-IV is probably from the early to mid 1980s.
This should restore lock in less than 90 degrees of rotation.
But most of these lasers that end up being resold are taken out of service because they have an end-of-life tube.
New supplies like the VMI 217 and VMI 373 have a built-in ripple reducer (active filter) which virtually eliminates this phenomenon unless it's broken.So, the peak is rather broad in comparison, but keeping it centered helps long term stability.Options include single or two (orthogonal) polarized mode output and selectrion of frequency or intensity stabilization, attached optical isolator, and fiber coupler.I'd expect that with a modern hard-seal tube, but not something presumably from the 1960s.The added voltage seen by the power supply (35 V per 10K ohms at the normal.5 mA tube current) should not annoy it very much.Connect the red wire of the 3-pin power connector to the positive output of your DC power supply.It may take a minute or more for it to settle down but if nothing happens, try readjusting R13 slightly higher or lower.The differences are primarily in the beam expander, the supporting structure for the output optics, and the use of a segmented magnet instead of a single piece magnet.More detail: if you have broadband electrical noise, it can shift the average beat signal and this will be detected in the average even if the noise is small relative to the noise of the test laser.I found the ballast resistance of one 7702 laser that was having these spasms to be around 140K ohms, which is definitely high.While the beam expander telescopes are easily swapped, they aren't interchangeable between lasers with the additional optic and those without it, since the effective (point) source of the beam is at a different location.
Watching the mode sweep on a plotting laser power meter showed the rapid induction heating process.
(This style board is previously what I called the "Newer Digital Control PCB".) For normal operation, this is functionally equivalent to the Type I Control PCB.
Original HP 5519A/B (1995?, similar to HP 5517A with Long-HV tube).
But swapping beam sampler assemblies often makes a noticeable difference.
Gas fills that are substantially single-isotope (including natural Ne which is approximately 9:1 for 20Ne and 22Ne, respectively) have a narrower gain bandwidth so that stabilization can be more effective, resulting in less susceptibility to drift in optical frequency.
Measure the voltage on TP15.
But it has the feel of a draft, before the Sales and Legal departments got their hands.For example, simply rolling a 20 penny (3 inch) steel nail around the outside will reduce the field inside by a few percent permanently.A detachable cable, separate from the Alden HV cable, feeds these signals to the controller box.(There should be a mark on the laser head case to indicate the plane of polarization.) If it isn't adequately equal, adjust R9 or R10 to make.Note that on high mileage lasers, there may be a significant periodic variation in beam intensity during warmup due to normal mode sweep.However, 5517Bs (which would be the most likely laser to be used for a transplant) never (or vitually never) have anything games for nintendo dsi r4i other than a 6 mm beam.