PR-805/810/810
L
User Manual
54
The IS-8xx is a 3 inch sphere designed to measure the total luminous flux (lumens) of LEDs or other small
source such as miniature lamps. This accessory consists of a sphere with baffle and LED Mounting Tube
(See Figure 57). During operation, the LED is inserted into the interior end of the Mounting Tube, the
Adjustment Screw is set so that the tip of the LED protrudes precisely 0.100 inches into the sphere, and
the measurement is conducted. The power cables for the LED (plus and minus current) are connected via
mini banana jacks located on the anterior end of the mounting tube.
FIGURE 57
–
IS-8XX INSIDE VIEW
I
NST ALLING THE
IS-8
XX
Step 1)
Remove the current optical accessory from the PR-8xx by turning counter-clockwise.
Step 2)
Install the IS-8xx by carefully threading clockwise into the C mount ring located in the
front of the instrument.
M
OUNTI NG T HE
LED
Step 1)
Loosen the Set Screw (see Figure 57) by turning it counter-clockwise.
Step 2)
Remove the Mounting Tube from the Collar by gently pulling away from the sphere. If
there is any resistance, further loosen the Set Screw.
Step 3)
Insert the leads of the LED into the two miniature sockets located on the interior end of
the Mounting Tube. Push the LED in as far as possible. Take care to note the polarization
of the leads. For simplicity, the POSITIVE LEAD should be inserted into the socket
corresponding to the RED Banana Jack located on the opposite end of the Mounting
Tube.
A
DJUSTI NG T HE
M
OU NTI NG
T
UBE
H
E IGHT
Step 1)
Referring to Figure 57, position the tip of the LED so that it is directly adjacent to the
Height Adjustment Screw, and resting on the outside surface of the Collar.
Step 2)
Adjust the Height Adjustment Screw so that it is just touching the end of the Mounting
Tube next to the LED.
Step 3)
Attach the LED current source (not supplied) to the Mounting Tube using appropriate
miniature banana plugs paying attention to the polarity.
