windozeuser
Member
Hey, I just picked up an old teleqipment S51B Oscilloscope for free. I was just wondering how I can make sure it's calibrated accurately. It works and powers on. I've feed it a simple square wave and it seems to be working ok.
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test the battery with a voltage meter, its unlikely that the battery is going to be exactly 1.5Volt.Set it to DC and connect a say a 1.5 Volt battery to the input. The line on the screen should go up or down by 1.5V depending on which direction the battery is connected. Repeat with other batteries - ie. 3V, 4.5V, 6V, etc.
Correct, this also applies to the AC voltage. A 6 Volt transformer will not necessarily give 6 V, particularily with no load.zachtheterrible said:test the battery with a voltage meter, its unlikely that the battery is going to be exactly 1.5Volt.Set it to DC and connect a say a 1.5 Volt battery to the input. The line on the screen should go up or down by 1.5V depending on which direction the battery is connected. Repeat with other batteries - ie. 3V, 4.5V, 6V, etc.
windozeuser said:Hey, I just picked up an old teleqipment S51B Oscilloscope for free. I was just wondering how I can make sure it's calibrated accurately. It works and powers on. I've feed it a simple square wave and it seems to be working ok.
Also, unless you can get the workshop manual, I wouldn't bother touching any adjustments, from what I remember they are quite obscure in those Telequipment scopes? - with adjustments affecting each other.
For 99% of use there's no need for it to be accurately calibrated anyway!.
windozeuser said:For 99% of use there's no need for it to be accurately calibrated anyway!.
Can you elaborate on this a little more?
Nigel Goodwin said:Bear in mind, how do you know your meter is accurate?, do you have it professionally calibrated and certified every year? (at great expense!). Digital meters have made people rather complacent, your meter might read 1.765V - but it's only going to be 1% or 2% accurate (even when new!), so you can throw the last digit away, and be very dubious about the next one as well!.
JimB said:That all depends on how much the meter cost in the first place, and el-cheapo will not be very accurate, something like a Fluke will have much better accuracy, but you pay for it!.
jbeng said:None of those sound to me like they will help your trace problem. Newer scopes often have an adjustment labelled "trace rotate", some even have it on the front panel. That's the one I would be looking for.
JB
windozeuser said:Nigel, The X-Axis line is Slightly Rotated at an angle, is there a setting to get it level and center