Weir 413D linear PSU: usage?

[eti]

I've just bought this beautiful Weir (Farnell?) 0-30V (-15-0-+15) linear PSU, fully working and in beautiful condition. However, the button in/out combinations are a bit cryptic; does anyone know what this all means, and what the top two button do? (to the right of the meter) - thank you.

The image is the correct orientation here, but sideways on the forum; apologies.

[Refrigerator]

The two combo switches on the top set the meter range, 30V or 10V, 2A or 6A range.
The switches below look like they just select transformer taps.
Here's the manual, i've haven't yet read through rather than just glanced at the schematic at the end of it.
https://www.testequipmenthq.com/datasheets/WEIR-413-413-Datasheet.pdf

Also i think this thread belongs in the test quipment section.

[eti]

The two combo switches on the top set the meter range, 30V or 10V, 2A or 6A range.
The switches below look like they just select transformer taps.
Here's the manual, i've haven't yet read through rather than just glanced at the schematic at the end of it.
https://www.testequipmenthq.com/datasheets/WEIR-413-413-Datasheet.pdf

Also i think this thread belongs in the test quipment section.

Thanks ever so much. Yes, I didn't put it in the "Test equipment" category, however, as I didn't think a PSU was a device which tests anything, in itself.

[Neomys Sapiens]

I read it as follows:
The lower group of switches selects the actual power supply range, the upper switches select the range of the meter.
In itself, a strange unit.

[Gyro]

Yes, Weir liked their multi output voltage range switching (I used to have a Weir Maxireg 761 with 15V/30V range switch). Just take extra care not to push the wrong range button with a circuit connected!

Good solid PSUs though, I never even changed a cap.

[eti]

Yes, Weir liked their multi output voltage range switching (I used to have a Weir Maxireg 761 with 15V/30V range switch). Just take extra care not to push the wrong range button with a circuit connected!

Good solid PSUs though, I never even changed a cap.

It's a really beautiful, classic design and layout inside. I've just been taking photos of the internals, meticulously; a thing of beauty, it will still be working in another 40 years I'm sure.

[eti]

One thing I can't work out is which VR to twiddle to get the meter calibrated. I have to increase the knob to make the analogue meter show 1V more, to get the actual voltage (measured on a dmm). For example, if I want 10V output on the 30V range, the
analogue, integral meter will say "11V".

I have read the calibration procedure in the PDF, but it's as clear as mud.

[Refrigerator]

One thing I can't work out is which VR to twiddle to get the meter calibrated. I have to increase the knob to make the analogue meter show 1V more, to get the actual voltage (measured on a dmm). For example, if I want 10V output on the 30V range, the
analogue, integral meter will say "11V".

I have read the calibration procedure in the PDF, but it's as clear as mud.

According to the manual i've found it's RV4 but the manual you included is different 
Also don't forget to adjust the needle spring in the meter.

[eti]

One thing I can't work out is which VR to twiddle to get the meter calibrated. I have to increase the knob to make the analogue meter show 1V more, to get the actual voltage (measured on a dmm). For example, if I want 10V output on the 30V range, the
analogue, integral meter will say "11V".

I have read the calibration procedure in the PDF, but it's as clear as mud.

According to the manual i've found it's RV4 but the manual you included is different 
Also don't forget to adjust the needle spring in the meter.

Thanks ever so much, Happy New Year