GrahamH's photos with the keyword: test

An assembly in the DownsSteam workshop which allows air regulators which are used in locos and carriages to be set to their required pressures. The type of regulator shown is used in the loco 106 and in the carriages. March 2024. PiP 1 shows the oily gunk which has to cleaned from the insides of a regulator after years of service. We use paint thinners with brush and rags to wipe down and wash out the body and the removable parts, and compressed air to blow out the thinners and gunk mixture. PiP 2 A closer general view. PiP 3 The gauges showing 660 Kilopascals input pressure and 40.7 pounds per square inch regulated output pressure.

A two page test report for the transmission links for a two-way radio system. The links joined the track-side base stations and the control centre. The system is no longer in use. This is used for checking the links shown here: www.ipernity.com/doc/grahamh/24117033 E&M signalling over copper pairs in Australia was done using the 4W (1 pair each direction for the audio signal) circuit, ie no additional conductors. This is done in a similar manner to that used in feeding DC power to a condenser/electret microphone in a public address or studio sound system. The direct current for the signalling flows one way equally on both wires of a pair with the earth being used as the return conductor.

A two page test report for the transmission links for a two-way radio system. The links joined the track-side base stations and the control centre. The system is no longer in use. This is used for checking the links shown here: www.ipernity.com/doc/grahamh/24117033

An infrequently used analog multimeter. I needed this meter for something but found resistance testing didn't work. It took a bit of work and a pair of new cells but it is working correctly again. July 2017.

I wanted a 12V test lamp while working on a car so I combined an LED and a resister off a scrap cct board, an old ballpoint pen tube, an old faulty multimeter probe, plus a crocodile clip and some wire from the junk box. I then used some solder, glue and heatshrink sleeving to put it all together. The photo shows the test lamp connected to the 12V output of a power supply. I expect this will also be used in working on electronics on the bench. February 2017.

I wanted a 12V test lamp while working on a car so I combined an LED and a resister off a scrap cct board, an old ballpoint pen tube, an old faulty multimeter probe, plus a crocodile clip and some wire from the junk box. I then used some solder, glue and heatshrink sleeving to put it all together. The photo shows the test lamp connected to the 12V output of a power supply. I expect this will also be used in working on electronics on the bench. February 2017. See note.

Tawney Frogmouth bird in a wattle tree at ISO 200 with no flash fill. December 2015.

Tawney Frogmouth bird in a wattle tree at ISO 200 with flash fill. December 2015.

Tawney Frogmouth bird in a wattle tree at ISO 400 with flash fill. December 2015.

Tawney Frogmouth bird in a wattle tree at ISO 800 with flash fill. December 2015.

Tawney Frogmouth bird in a wattle tree at ISO 1600 with flash fill. December 2015.

A test sheet used to record basic measurements on a 4 wire plus E & M circuit. For this project the functionality was mostly derived from either two pairs of copper wires or a 64K slot from a 2M PDH stream. The links connected train radio base station controllers with the central control for the railway route. See www.ipernity.com/doc/grahamh/24117033/in/group/873405

The cover off the counter to plan modifications to run from 12v car battery etc.

The cover off the counter to plan modifications to run from 12v car battery etc.

The cover off the counter to plan modifications to run from 12v car battery etc.

The cover off the counter to plan modifications to run from 12v car battery etc.

The cover off the counter to plan modifications to run from 12v car battery etc. It surprised me that the power transformer was centre tapped to earth and each side feeding a single diode ala valve rectifier ccts of old.

The cover off the counter to plan modifications to run from 12v car battery etc. It surprised me that the power transformer was centre tapped to earth and each side feeding a single diode ala valve rectifier ccts of old.