For Sale FS: Photronix Densitometer

For sale:

Photronix Delta III transmission densitometer. $35.00 Excellent condition, fully functional with original instructions and power supply. Very compact and easy to store; 9.5" long, 7" wide, 6.5" tall.

This densitometer was made in the sometime in the early 90's. This is a transmission (film only) densitometer. It does work well and the readings are consistent, yet measurements of a step wedge are off and there are no user calibration instructions. The original calibration has likely drifted with age.

USPS Priority Mail shipping to U.S. destinations is included! Please PM me here on APUG if interested. Sorry, no PayPal.

Is this still available?

Yes, still available.

Schematic attached. Hard to read due to attachment size limits here.

P2 and P3 should be the primary calibrations. They set the gain of the amplifier for each range. Set them with step wedge steps that have the meter pointer at the left side of the scale.

P1 is the offset null for the 741 op-amp. I think it should be left alone.

Sold! Thanks!