Assembling a two-channel sun photometer pc board

These photos show you how to assemble components for a two-channel sun photometer with a built-in temperature sensor and connections to a digital panel meter. The photos are required because this pc board does not have any labels on the component side. These are not complete sun photometer construction instructions, but are intended only to provide some guidance for those who are otherwise equipped to build sun photometers on their own.

Note that not all connections on the board are used. The first photo shows how to prepare the board and how to place all components that must be oriented in a particular direction. Be sure to orient these components as shown!

The second photo shows the board after adding the other board-mounted components. These components can be mounted in any orientation. The third photo shows the case along with some other components, including the rotary switch. Be sure to mount the meter in the case with the label oriented as shown. See below for close-up photo of pc board soldered onto meter pins. Note that one corner of the meter's retainer has been cut off -- otherwise it would be in the way of the rotary switch when it is mounted.

The nex+t photo shows the remaining connections to the pc board: on-off switch, channel select switch. +5V (for digital panel meter power) and common.

Components that must be oriented in a particular direction. Note that the op-amp lettering is upside down in this view, but it is mounted correctly on the board.

Components that can be oriented in either direction. The resistor values may be different. The capacitors, especially the 220 pf capacitors, may look different from the photo.

Case with components. Note orientation of "clipped" corner of meter retainer.

Other connections to pc board.

Solder pc board to DATEL panel meter. Be sure to observe orientation of panel meter and board. The label may be a stuck-on paper label or it may be printed directly on the side of the meter. Only 7 pins, as shown, need to be soldered to this board.
Two views of inside of case. Note orientation of on/off switch. Foam plastic separates battery from back of pc board. Wires from rotary switch are taped down, making sure ends don't touch each other.

Components that must be oriented in a particular direction. Note that the op-amp lettering is upside down in this view, but it is mounted correctly on the board.
Components that can be oriented in either direction. The resistor values may be different. The capacitors, especially the 220 pf capacitors, may look different from the photo.
Case with components. Note orientation of "clipped" corner of meter retainer.
Other connections to pc board.
Solder pc board to DATEL panel meter. Be sure to observe orientation of panel meter and board. The label may be a stuck-on paper label or it may be printed directly on the side of the meter. Only 7 pins, as shown, need to be soldered to this board.
Two views of inside of case. Note orientation of on/off switch. Foam plastic separates battery from back of pc board. Wires from rotary switch are taped down, making sure ends don't touch each other.