What is standard/common test gear dimensions?

[001]

Hi!
Folks, tell me what is standard/common enclosures  dimensions?
Power Supplies, Oscilloscopes, Counters etc
I know about 19 racks but there are many smallest units everywere
How to chose standard dimensions for selfmade gear?

[T3sl4co1l]

Glancing at my bench, and thinking about other gear I've seen:

There is absolutely, positively none.

Rackmount dimensions are probably a somewhat hard maximum limit, beyond which you're really dealing with floor-standing equipment anyway (which, itself, may simply be a rack cabinet or more..).

Tim

[G0HZU]

Don't overlook the fact that a lot of smaller test gear is still designed with the 'U' system in terms of height even if it isn't 19" wide.

Each U is 1.75" and a lot of smaller test gear will be 2U tall (or 3.5" tall). This could be a DMM or a function generator. The width might be a fraction of 19". A typical DMM will be 2U tall and half a rack wide.

A small scope might be 3U tall and some tiny/skinny gear might be a few inches wide but still conform to being 1U or 1.75" tall. This is to allow small/narrow test gear to still fit neatly (2 or three  items side by side?) within the U system in a 19" ATE rack without it all looking like crazy paving.

[jpb]

The following table is one I put together of my lab equipment or equipment I'm considering getting and you can see there is a wide range of sizes and weights (I did it to try an plan out shelving on my lab bench).

Instrument	Width (mm)	Height (mm)	Depth (mm)	Weight (kg)	Weight/ Width kg/cm	Power Consumption
Keithley 2000 Bench Multimeter	213	104	370	2.9	0.14	22VA
Keithley 2015 Bench Multimeter	238	104	370	4.2	0.18	40VA
Tektronix FC3100 Counter	210	90	395	2.7	0.13	<40W
LeCroy WaveJet	285	190	102	3.2	0.11	75VA
HM7042-5 triple power supply	285	75	365	7.4	0.26	330VA/250W
Hameg HM8135 RF Synthesizer	285	75	365	5	0.18	40VA
Agilent 33522A Waveform Generator	261.1	103.8	303.2	3.3	0.13	<45W
Agilent E3631A power supply	213	133	348	8.2	0.38	Output 80W input ? (80/0.4 = 200W)
TI TF930 frequency counter	260	88	235	0.950	0.04	5W
TTi PL320QMD power supply	350	170	265	9.5	0.27	Output 134W input? (134/0.4 = 335W)
Advantest 7451A DMM	212	88	340	3.4	0.16	20VA
Dell Precision T5500	171	448	471
Aeroflex 3250	380	200	400	14	0.37	140W
R&S  FPC1000	396	185	156	3	0.08	14W

[G0HZU]

In terms of height many of those items will probably conform to the U system. That would mean the height will be a multiple of 44.45mm =1U when the unit is configured for rack mounting (no feet or handle fitted).

For example, the Keithley 2000/2015 DMM is mainly designed to be used in an ATE rack via GPIB or RS232. The height dimensions above of 104mm include the feet and handles. Remove them and the 2015 is 89mm or 3.5" tall. A sliding fit for a 2U (3.5") rack shelf

[jpb]

In terms of height many of those items will probably conform to the U system. That would mean the height will be a multiple of 44.45mm =1U when the unit is configured for rack mounting (no feet or handle fitted).

For example, the Keithley 2000/2015 DMM is mainly designed to be used in an ATE rack via GPIB or RS232. The height dimensions above of 104mm include the feet and handles. Remove them and the 2015 is 89mm or 3.5" tall. A sliding fit for a 2U (3.5") rack shelf

Yes, a lot of them fall into the 2U slot, if I remove handles but then the Hameg ones are designed to stack but are only 75mm tall and the TTi power supply is not designed for a rack at all and neither is the WaveJet. For my setup I want to keep the handles in place and use shelves so I need to allow more space.

The lengths are also designed to be typically less than 40cm and I guess that this is for rack fitting as well but there is quite a range from nearer 30cm to very close to 40cm. I've often found this a pain in the past as standard shelves (for domestic use) tend to be 30cm and it is hard to find ones that are 45 cm deep unless you go for industrial type shelving e.g. chrome shelving which has other issues.

[G0HZU]

Yes, I think the primary aim for a lot of test gear is to make it fit the rack/U system quite well once stripped and configured for ATE use. But things get a bit vague once you add the handles and feet for bench use.

I think the newer (manual and programmable) TTI supplies are typically 3U. I've never formally fitted stuff to ATE racks but I think you can buy rack mount kits for much of the modern TTi PSU range direct from TTi.

[nctnico]

Hi!
Folks, tell me what is standard/common enclosures  dimensions?
Power Supplies, Oscilloscopes, Counters etc
I know about 19 racks but there are many smallest units everywere
How to chose standard dimensions for selfmade gear?

The case sizes usually are multiples of half 19" wide / 1U height units where half 19" wide and 2U high seems to be very popular.

[exe]

The following table is one I put together of my lab equipment or equipment I'm considering getting and you can see there is a wide range of sizes and weights (I did it to try an plan out shelving on my lab bench).

Instrument	Width (mm)	Height (mm)	Depth (mm)	Weight (kg)	Weight/ Width kg/cm	Power Consumption
Keithley 2000 Bench Multimeter	213	104	370	2.9	0.14	22VA
Keithley 2015 Bench Multimeter	238	104	370	4.2	0.18	40VA

Keithley 2000 and 2015 are basically the same meter, they have same dimentions. They are 213mm wide, which is what I call "half-width rackmount".

I'd say rack-size is a standard. At least width and height. Depth is sort of arbitrary. I'd suggest stick to it, this increases chances to stack equipment.