ePHOTOzine has partnered up with to bring you a selection of Gossen Lunasix 3 instruction manuals and related photographic literature. Gossen Lunasix 3, although built around the early ’70, is a very The Gossen Lunasix is a purely passive circuit, i.e. there are only .. Hello, at last I´ve been able to calibrate mi gossen Lunasix 3 with your instructions. In the. Maker: Gossen. Dates: Variants: Lunasix, Lunasix 3, Lunasix 3s. Type: Ambient exposure meter.
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October 25, at There are actually two relatively independent meter circuits, one for highlights and one for low-light. Insert batteries and activate the battery check no need to reassemble the meter at this point. You will not gain much anyway, because the adjustment has to be done in very fine increments and so putting some sort of a scale on each pot will be useless. You will need steady hands, luunasix few small tools, and another accurate meter as a reference.
Remember, that the upper scale end is more accurate and around cross-over between the scales just take the reading from the lower range as more reliable. Lunasix light meters are also labelled Luna-Pro in some parts of the World. I recently received a lunasix 3, which I am now struggling to calibrate.
Hi, Pete Many thanks for your advice and help. A later revision changed from the original mercury batteries, these models being distinguished by a black case. The meter draws a minute amount of power and so the voltage drop across a small-signal thin and steep Gossej junction silicone diode will be less than 0.
The negative pole goes to the corner of the board, while the positive ends somewhere around the center. If its contacts are corroded oxidized nothing will work reliably. I took out the battery, press the range selector forward or backward, then I turn the zero adjustment screw on the backside of Lunasix while holding down the range selector. Measurement is made by depressing the rocker switch in one direction for low light, and the other for daylight. Alkaline battery does not hold constant voltage along the discharge curve.
Do you mznual a multimeter? Equally, producing an accurate EV0 for calibrating low-light scale might turn tricky, so you can instead cheat, put the filter in decoupled from its drive spring and measure EV6 instead. The range of adjustment is sufficient by design to accomodate the variance and normal i.
Can you give me an advice why my meter can not be positioned zero properly?
I’m afraid it mwnual like it to me. Take a route around your house, in and out. Pointer needle with mechanical computer Sensor: Everything looks reasonable, although I have no way of really knowing. An observant reader might have noticed, that the CdS cell does not change during calibration.
In the upper scale my Lunasix is spot-on, but in the low light scale I have more trouble due to a faulty potentiometer. Marek, this is a wonderful article which should make calibrating my Lunasix 3 easy.
It might be the reason why I got the much higher light value. The first approach is easier when you either have an adjustable lightbox, or several white walls with different levels of illumination accessible at all times. The Lunasix and Luna-pro meters are designed to use a pair of mercury cells. Light is detected using a CdS Cadmium Sulphide LDR light dependent resistor that directly influences amount of current allowed into the galvanometer.
If I pull the case apart slightly, it works smoothly. At 10 I can adjust the slope pot to read 10, but at 5 I have to turn the offset pot all the way down just to get amnual unit to read about 6.
Gossen Lunasix 3 Instruction Manuals
My next project will be restoring the old selenium meter of a Yashica-mat LM. I have all but the lower third of the scale pretty well filled in.
It should be silverish and quite opaque, you might see a light source like the sun or a bright bulb through it, but not your desk. Inspect the left-top side of the meter. Any offhand advice would be greatly appreciated!
The two pots closer to the center are for adjusting offset, while the two pots that on the outside adjust the slope more or less, they are actually cross-linked. How to interepret this problem? Which one should I use? While many meters can be easily calibrated in one-shot by computing necessary resistor values and just setting them, Gossen meters make this approach extremely difficult by using a non-linear scale.
Otherwise the idea of an LDO crossed my mind, it was just not worth it… You anyway will need to calibrate the whole business. The original Lunasix design is olnly resistive and so very linear.
I disassembled the meter to see if I could find the trouble. If so, best thing would be to test the CdS cell — use a controlled setup ran against a known good meter and register resistance of the cell for every EV level in the range. For many a hobby tinkerer this is not the case. Earlier models can be used with later batteries by simply setting a different ISO. Something to be aware of: It might still need a slight adjustment, but it will be tiny.
Gossen Lunasix 3 light meter instruction manual, user manual, free PDF manual
A wall in a windowless toilet lunasox be as dark as EV-3, a whitewashed wall outside in the sun will hit EV17, try your best to fill at least the gray marked range in the spreadsheet. Lunasix, Lunasix 3, Lunasix 3s Type: The battery check was a bit high. Maybe I can get around that like this. It will cost you less work than recalibrating the meter. The switch looks manuzl, but I cleaned the contacts just in case.
If your meter was dead-on with mercury batteries and the meter needle on battery check stops now within the red field you are most likely done.