Diesel expressions in field inside dynamic block

[S_S_SS]

Hello every one 
I need to make field that appear value if the dimensional constraint have a value bigger than 2000 
$(if, $(>, $(getvar, Telescope_Height), 2000), "XB 1.20 m", "")

i try to make it with the diesel as the above
Telescope_Height is the dimensional constraint value 
XB 1.20 m   is the field that i need it to appear 
but it don't work 
can someone help me in this ??
i've made a simple example in the attached DWG 
thanks in advance 

[h_s_walker]

Use a double lookup to change visibility states depending on the length of the parameter. See the attached drawing. The number automatically changes because it's a dimension which is associated with the line.

[S_S_SS]

Thanks sir for your reply 
but it's necessary to make it dimensional constraint not linear parameter because i need it to make specific calculations
also I've more and more visibilities and then i must double all these visibilities to make what i need ....
so i see that it's necessary to use the diesel expression ....

[h_s_walker]

Are these multiple visibilities in one block or multiple blocks? If it's one block you only need one visibility state for the > value.

[S_S_SS]

these all the visibilities in one dynamic block 

i should make all of them to if the value bigger than 2000 
and if it's less than 2000 ?? 

you can see the attached DWG 
THE DIMENSION CONSTRIANT NAME IS Telescope_Height
AND SEE THE FOLLOWIMG FIELD PLACE IN EACH VISIBILITY 

CAN HELP ME HOW TO MAKE THIS ?? 

[Libbya]

How do you make the telescope_height greater than 2000?  It looks like the largest increment is 1433.

[S_S_SS]

Yes you are right it was an example to understand what i can do

Make it 833 instead of 2000

[Libbya · Accepted solution]

If all of the specific values are increments, then you can write the attribute value directly using a block properties table or for ranges you could use a lookup not for a visibility state, but just to define the lookup value for the specific range and then use a blockplaceholder field referencing the lookup value.  

[S_S_SS]

okay thanks sir for that