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If you look closely at the scale calibration you will see that the scale calibration starts at 200 mSec and then reduces to 100 then 50 then 20 then 10 then 5 then 2 then 1 then 0.5 then 0.2 then 0.1, and then the scale divides with the grey patch.
This is a common scale factor; ie 1:2:5
At the point where the scale is divided, the mSec side is 0.1. That is 0.1 mSec per cm. This is the same as 100 uSec per cm.. The scale keeps on reducing as one continues to turn the knob clockwise. Based on the scale factor of 1:2:5, the next scan rate should be 50 uSec per cm; which it is.
So to the left of the 1 oclock mark the scale is mSec per cm; to the right of the mark is uSec per cm.
hope this helps.
;using AT89C51 with XTAL 12 MHz'
org 0x0
Repeat:
mov A, #55H
mov P0, A
mov P1, A
mov P2, A
ACALL Delay ;ACALL take two bytes - 11 bits are used for address. LCALL takes 3 bytes
;For ACALL target address of subroutine should lie within 2K bytes
mov A, #0AAH
mov P0, A
mov P1, A
mov P2, A
ACALL Delay
SJMP Repeat
;-------Delay Subroutine
;period of one MC = 0.001 ms
;75(50(255x2x0.001)) = 1912.5 ms = 2 s
org 0x300
Delay:
mov R0, #75 ;1 MC
L1: mov R1, #50
L2: mov R2, #255
L3: DJNZ R2, L3 ;2 MC
DJNZ R1, L2
DJNZ R0, L1
RET ;2 MC
end
My first recomendation - get a real oscilloscope to learn with, not this computer game. (Others may have different opinions.)
Now to the problem in hand:
The big yellow triangle thing is pointing to 200mS, so I suspect that the horizontal scale is 200mS per division.
Assuming that your computer game is supposed to be a facsimile of a real oscilloscope, the little yellow triangle which is pointing to 0.5μS is actually the "variable" control. So that if you want some intermediate value of timebase speed between the fixed 1, 2, 5 settings of the switch (say 125mS per division) you can set this using the variable control.
Generally with a real oscilloscope, the variable control is set fully clockwise when not required, because fully clockwise is the calibrated position where the switch settings are accurate.
Look at the attached pictures of my old scope.
JimB
Set the big yellow triangle to 100mS and then the little yellow triangle to ?? who knows, somewhere anticlockwise from where it is.How do I get 125 ms value? I mean, where would both dials point to for 125 ms value?
Set the big yellow triangle to 100mS and then the little yellow triangle to ?? who knows, somewhere anticlockwise from where it is.
This of course assumes that I am correct in interpreting your scope display.
Question, dont you have a "manual" for it, in which case RTFM! (Or should that be RTFPDF?).
JimB
PS, my scope was about 10 years old when I bought it around 1984.
You are welcome.Thank you.
Well, there is a lesson for the future, if you ever get into the situation where you have to write user or maintenance manuals, make sure that you include EVERYTHING.And the manual didn't have that information otherwise why would I start this thread, take screenshots, make video etc?!