65 Teed Dr., Randolph, MA 02368
Phone: 781-961-3066 Toll Free: 866-961-3066 Fax: 781-961-3256
TECHNICAL SERVICES DEPARTMENT
Kathleen comes to ALPS with
over fifteen years of theatrical and technical lighting experience, as well
as ETC and Strand certification.
Most recently, she was a service technician
at Barbizon Light of New England. Commissioned venues include: Boston Opera
House, Jordan's Furniture, Boston University Agganis Arena, WHDH, and St.
Paul's School.
Kathleen is excited to be back on the South Shore, where she resides with
her husband Mike and son Ian.
The ALPS Technical Services Department offers a great deal more than just a
state of the art equipment repair facility. We provide in-house
and field
repair and maintenance services, complete training and programming
classes,
as well as custom cable and electrical power distribution fabrication.
Our trained technical staff has years of experience working with control and dimming products
from EDI, ETC, Leprecon, NSI and numerous other manufacturers.
Send The Service Department an E-mail.
The following is a collection of math formulas that can prove useful.
Power:
Watts = Volts * Amps
Amps = Watts / Volts
"640k ought to be enough for anybody." - Bill Gates, 1981
Sine Wave (VAC):
RMS Volts = 0.707 x Peak Volts
RMS Volts = 1.11 x Average Volts
Peak Volts = 1.57 x Average Volts
Peak Volts = 1.414 x RMS Volts
Average Volts = 0.637 x Peak Volts
Average Volts = 0.9 x RMS Volts
After eating, do amphibians need to wait an hour before getting
OUT of the water?
DC voltage drop of conductor (cable) of L length
V = voltage drop, I = current
R = resistance of conductor per 1000 feet
L = length of conductor in feet
R for 18awg = 6.51, 16awg = 4.09, 14awg = 2.58
12awg = 1.62, 10awg = 1.02, 8awg = 0.64
"As their numbers shrank from 80 to 8, the dwarves began to suspect
Hungry." - unknown
V = I * L * (R / 1000) * 1.004
Last night I played a blank tape at full blast. The mime nextdoor
went nuts.
unit conversions:
inches = millimeters / 25.4
millimeters = inches * 25.4
feet = meters / 0.3048
meters = feet * 0.3048
If olive oil comes from olives, where does baby oil come from?
footcandles = lux / 10.8
lux = footcandles * 10.8
Just think how much deeper the ocean would be if sponges didn't
live there.
Centigrade = 0.556 * (Fahrenheit - 32)
Fahrenheit = 1.8 * (Centigrade + 32)
I went for a walk last night, and my kids asked me how long I'd
be gone. I said, "The whole time."
pounds = kilograms * 2.205
kilograms = pounds * 0.454
"Being a Mac user is like being a Navy SEAL: a small, elite group
of people with access to the most
sophisticated technology in the world, who everyone calls on to
get the really tough jobs done
quickly and efficiently." - unknown
degrees = 180 * radians / PI
radians = PI * degrees /180
Whatever happened to Preparations A through G?
pattern projection magnification and required pattern size:
A = new pattern size, B = old pattern size,
C = new projection size, D = old projection size
P = projection magnification
Is it true that cannibals don't eat clowns because they taste
funny?
for standard AQ61 (or Altman 360Q) ellipsoidals, consider old pattern size to be 3" (size of gate), and old projection size to be the beam spread using the field angle information. Check diameter of gate (shutter plane opening) for other fixtures.
A = B * (C/D)
P = D / B
distances, intensities, spreads, and angles:
As seen in the above drawing:
D = throw distance, V = vertical height, H = horizontal distance,
C = focus angle off horizontal, K = focus angle off vertical,
F = beam or field angle of fixture
X = beam spread (beam oval width), Y = beam oval length
mf = beam spread multiplying factor
How come abbreviated is such a long word?
footcandles:
Footcandles = Candlepower / (D * D)
So what's the speed of dark?
candlepower:
Candlepower = Footcandles * (D * D)
If a cow laughed, would milk come out her nose?
beam angle multiplying factor (mf):
mf = 2 * TAN(F / 2)
mf = X / D
If it's tourist season, why can't we shoot them?
beam angle (F):
F = 2 * ATAN(mf / 2)
F = 2 * ATAN(X / (2 * D) )
Whose cruel idea was it for the word "lisp" to have an "s" in
it?
beam spread (oval width X if not straight on):
X = D * (2 * TAN(F / 2))
X = D * mf
If you're sending someone some Styrofoam, what do you pack it
in?
beam oval length (Y) (when beam hits surface at angle):
Y = V * ( TAN(K + F/2) - TAN(K - F/2) )
throw distance (D):
D = X / mf
D = SQUARE ROOT( (V * V) + (H * H) )
D = H / COS(C)
D = V / SIN(C)
D = H / SIN(K)
D = V / COS(K)
D = SQUARE ROOT(Candlepower / Footcandles)
Why don't they just make mouse-flavored cat food?
horizontal distance (H):
H = SQUARE ROOT( (D * D) - (V * V) )
H = V / TAN(C)
H = D * COS(C)
H = D * SIN(K)
H = V * TAN(K)
I just got skylights put in my place. The people who live
above me are furious.
vertical height (V):
V = SQUARE ROOT( (D * D) - (H * H) )
V = H * TAN(C)
V = D * SIN(C)
V = D * COS(K)
V = H / TAN(K)
focus angle off horizontal (C):
C = ATAN(V / H)
C = ASIN(V / D)
C = 90 - ASIN(H / D)
C = 90 - K
focus angle off vertical (K):
K = ATAN(H / V)
K = ASIN(H / D)
K = 90 - ASIN(V / D)
K = 90 - C
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