Princeton 750i User Manual
15 Discovery Way, Acton, MA 01720
Phone: (978)263-3584, Fax: (978)263-5086
Web Site:
www.piacton.com
Operating Instructions
Acton SP-750i
0.750 Meter Focal Length Triple Grating
Imaging Monochromator / Spectrograph
750i Manual V1098.1
Acton SP-750i
Operating Instructions
CONTENTS: Page
I. Brief Introduction and SP-750i Description 2
II. Specifications 3
III. SP-750i Setup
A. Unpacking Note 4
B. Connecting the SP-750i to the Optional 749 4
Remote Scan Controller, or to a Computer
C. Cables and Connections for SP-750i 5
D. Mounting Accessories 6
E. Mounting Focal Plane Detectors 7
F. Slit Width Adjustment for 716 Bilateral Slits and 715 Fixed
Slit Assemblies 8 - 9
IV. SP-750i Operation
A. Initialization 10
B. Operating the SP-750i Using the Model 750-749
Remote Scan Controller 10 - 14
C. Operating the SP-750i Using a Computer 15 - 19
D. Focusing and Aligning CCD Array Detectors 19
E. Changing from Monochromator to Spectrograph Operation 20
V. Appendices and Schematic Drawings
A. Alternate Start-Up Parameters 21
B. Cable Connection Diagrams 22
C. Standard Slit Assembly Drawing 23
D. Accessories List and Ordering Information 24 - 29
E. Certification and Warranty Information 30
F. Drawing No. 8450-750-50, titled “SP-750i” 31
1
I: Brief Introduction and SP-750i Description
Brief Introduction:
This instruction manual is intended to assist you in set-up and operation of your new SP-750i
monochromator/spectrograph. Even if you are an experienced user of spectroscopic equipment, we suggest
that you follow the manual (at least initially) to insure proper setup and operation. If you have any
questions about the information contained in this manual, please feel free to contact the Princeton
Instruments customer service department.
SP-750i Description:
The SP-750i is a 750mm focal length monochromator/spectrograph. It features an astigmatism-corrected
optical system, triple indexable gratings and triple grating turret. The SP-750i includes a direct digital
grating scan mechanism with full wavelength scanning capabilities, plus built-in RS232 and IEEE488
computer interfaces.
2
II: SP-750i Specifications
NOTE: Each SP-750i is operated for at least 15 minutes prior to
calibration to insure optimum stability. End users should
follow this practice if their application calls for optimum
stability & reproducibility.
Every SP-750i monochromator or spectrograph
includes a triple grating turret for 1, 2, or 3 gratings,
an imaging optical system, 32-bit microprocessor
controlled scanning, built-in RS232 and IEEE488
interfaces, and micrometer controlled entrance slit
(optional second entrance slit available).
Model SP-555 Monochromator
Triple
Grating
Turret
Entrance
Slit
Exit
Slit
Includes 90° optical path, and micrometer
adjustable entrance and exit slits.
Optional
Entrance
Slit
Model SP-557
Dual Exit Port Monochromator
Motorized
Mirror
Two
Exit
Slits
Includes micrometer controlled dual exit
slits (90 & 180°), and motorized mirror for
rapid, computer controlled exit slit selection.
Triple
Grating
Turret
Entrance
Slit
Optional
Entrance
Slit
Model SP-556 Spectrograph
CCD
Port
Includes 90° optical path, large 14mm X
27mm focal plane, plus sliding tube CCD
adapter with focus-stop.
Model SP-558
Monochromator/Spectrograph
Motorized
Mirror
Exit
Slit
CCD
Port
Includes dual exit ports; one exit slit and
one sliding tube CCD adapter with motorized mirror for rapid, computer controlled
exit port selection.
Triple
Grating
Turret
Entrance
Slit
Optional
Entrance
Slit
Triple
Grating
Turret
Entrance
Slit
Optional
Entrance
Slit
Specifications (1200g/mm Grating)
Focal length: 750mm
Aperture Ratio: f/6.5 (68x68mm gratings)
Optical Design: Imaging Czerny-Turner with
original polished aspheric mirrors
Optical Paths: 90° standard, 180° and
multi-port optional
Scan Range: 0 to 1400nm mechanical
range
Operating Range: 185nm to the far infrared
with available gratings and accessories
Resolution: 0.05nm at 435.8nm
Dispersion: 1.7nm/mm (nominal)
Accuracy: ±0.2nm
Repeatability: ±0.05nm
Drive Step Size: 0.0025nm (nominal)
Focal Plane Size: 27mm wide x 14mm high
CCD Focus Arrangement: Exclusive o-ring
sealed sliding tube with unique 3-point focus
stop/fine focus adjustment mechanism.
Detector Coverage: ~42.5nm across a 1.0”
wide focal plane (~85nm: 600g/mm grating)
Standard Slits: Micrometer adjustable from
10µm to 3mm wide. Slit heights: 4 & 14mm
Grating Mount: Triple grating turret for 1, 2,
or 3 gratings.
Interchangeable Grating Turrets: Optional
Grating Change Time: Less than 20 seconds
Grating Drive System: 32-bit microprocessor
controlled direct digital scanning (DDS)
system.
Scan Linearity: The SP-750i scans
linear with respect to wavelength
Size: 21” long (534mm)
11” wide (280mm)
8” high (203mm)
4.875” (123.8mm) optical axis height
Weight: 40 lbs (18kg)
Tested and conforms to European CE
Standards
3
III. SP-750i Setup
Section III-A: Unpacking and Inspection
Carefully unpack and examine the SP-750i and any accessories purchased.
Note: Report any damage immediately to the carrier and to
Princeton Instruments, and save all packing materials.
Section III-B: Connecting the SP-750i Monochromator/Spectrograph to the
Optional Model 750-749 Remote Scan Controller or Computer
The SP-750i is designed for operation by computer using RS232 or IEEE488, or by using the optional
Model 750-749 Remote Scan Controller. Either method of control enables wavelength scanning
at a pre-set linear scan rate, change of scanning speeds, grating selection, rapid GOTO wavelength
positioning, change of grating turrets if available, and “jog” wavelength positioning. Figure 1 below shows
the cable connections necessary for operation from a computer through the COM ports or with a GPIB
controller card. Figure 2 below shows the cable connections necessary for operation of the SP-750i
with the optional Model 750-749 remote scan controller. Refer to the Monochromator Control
Software for Windows for operation with a computer. Refer to Section IV-B for details on operation with the
Model 750-749 remote scan controller.
SP-750i Cable Connections:
Optional 750-749 Remote Scan Controller, RS232, or IEEE488
SP-750i Computer
FIGURE 1
Control from Computer
GPIB
power
POWER
SUPPLY
SP-750i
RS232
power
RS232
GPIB
GPIB Controller
COM Port*
FIGURE 2
Control from Optional
750-749 Remote Scan
Controller
*COM 1
or
COM 2
POWER
SUPPLY
750-749
4
Section III-C: Cables and Connections for SP-750i
Princeton Instruments offers the following computer cables as options:
CC-499-1 IBM PC or XT compatible
25 pin female ( DB25S) connector to 9 pin male connector ( DB9P).
CC-499-2 IBM AT or compatible
9 pin female ( DB9S) connector to 9 pin male connector ( DB9P).
CC-499-3 Computer terminal type
25 pin male ( DB25S) connector to 9 pin male connector ( DB9P).
CC-499-4 9-pin cable for Macintosh computer
CC-499-5 IEEE488 cable, 4 meters long
The cable CC-499-2 is included with the SP-750i. The other cables are optional. If none of these
cables are compatible with your system, consult Princeton Instruments for a custom cable. If you have
facilities for constructing a custom cable, use the RS232 pin arrangement shown in Table 1, or the
IEEE-488 pin arrangement shown in Table 2. See also Appendix B.
Table 1: RS232 Computer Interface Pin Arrangement:
pin # description
1 open
2 RD data from SP-750i to computer
3 TD data from computer to SP-750i
4 open
5 ground
6 open
7 RTS connect these two pins together
8 CTS
9 Open
A terminal or RS232 computer port must be set up as follows: 9600 baud, 8 data bits, no parity, 1 start bit,
1 stop bit.
Table 2: IEEE488 Computer Interface
Pin Arrangement:
Table 3: Power Input Pin Arrangement:
PIN# DESCRIPTION
1 +5V
2 GND
3 GND
4 +24V
#2
#3
#1
#4
5
Section III-D: Mounting Accessories to the SP-750i Slit Assemblies
All Acton accessories come with their own set of instructions for proper mounting and operation. The
instructions below are only general information. Please refer to the individual instructions for detailed
information.
Accessories: The full range of Acton SP accessories mount directly to the SP-750i slit assemblies.
A drawing of the standard slit assemblies can be found in the Appendices Section to assist you
in mounting accessories. To mount an accessory to the slit, the general procedure is as follows:
1. Place the accessory directly against the face of the slit body. Light sources normally mount
on the entrance slit, detectors on the exit slit. Other accessories such as fiber bundles
normally mount on the entrance slit, but are also compatible with the exit slit.
2. Using four (4) 8-32 screws normally provided with the accessory, secure the accessory to the
slit body.
Light sources fitted with light collection/focusing optics are normally factory aligned to the standard slit.
Note: In some instances with light sources, there is limited access to the
bottom two screw holes. In this case, Princeton Instruments provides
special slotted holes in the light source housing to facilitate mounting
of the source to the slit.
Section III-E: Detector Mounting Instructions: Mounting Focal Plane Detectors to
the SP-750i Spectrograph
The standard mounting flange for CCDs and diode arrays accommodates detectors with two different bolt
circles. There are three (3) equally spaced 10-32 tapped holes on a 3.60” bolt circle, and three (3) equally
spaced holes on a 3.88” bolt circle designed to accept 10-32 button head screws. A set of special
cross-shaped baffles are mounted in the array detector mounting flange to define the focal plane area and
reduce potential stray light. This unique baffle shape permits mounting of many different array detectors.
To mount an array detector to the SP-750i, use the following procedure:
1. The array detector mounting flange is attached to a sliding tube, which fits inside a unique
split camp arrangement.
2. Loosen the split clamp and gently slide the array detector mounting flange all the way out of
the SP-750i housing. Make sure that the sliding tube and o-ring are kept clean.
NOTE: At this point it is very important to check the focal plane distance
of the array detector. This is the distance from the front mounting
surface of the array detector to the actual CCD or diode array
element. Because array detector focal distances vary, the correct
distance is crucial in order to determine if a spacer is required for
proper focus. This spacer is provided with spectrographs. If the
detector focal plane distance falls between .67” and 1.00”, then no
spacer is required.
6
3. Position the array detector mounting flange against the array detector, and match the hole
patterns. When correctly positioned, the baffles should be square to the array detector. If it
does not align properly, contact Princeton Instruments.
4. Fasten the array detector mounting flange to the detector, then carefully slide this assembly
back into the SP-750i housing.
5. Tighten the #10-32 set screw on the top of the front plate first, and then tighten the one on
the side.
Refer to Section IV-D for focusing reprocedures for array detectors.
7
Section III-F: Slit Width Adjustments in the Model 716 Bilateral Slits
The slit width of each bilateral slit assembly (716 type) is adjustable from 0.010 millimeters to 3
millimeters (10 to 3,000 µm) by a micrometer located on the top of the slit housing. The micrometer
knob is graduated in 0.010 millimeter (10 µm) increments.
Each clockwise revolution of the micrometer knob increases the slit width 0.25 millimeters (250 µm). For
maximum reproducibility, the slit width should be set in a clockwise direction (increasing slit widths)
each time it is changed. Refer to the drawing below.
The micrometer knob should not be rotated below a reading of 0.00 or above 3.00. A micrometer setting
of less than 0.010 millimeters (10 µm) should not be used, because a stop is provided to prevent the slit
jaws from contacting each other.
Note: Damage May Be Done If Slit Jaws Are Opened Wider Than 3.0mm.
Slit Width Setting:
200 Micrometers (0.200mm)
Slit Width Setting:
1380 Micrometers (1.38mm)
8
Section III-F Continued: Interchanging Fixed Width Slit Plates in the
Model 715 Fixed Slit Assemblies:
If your SP-750i was purchased with the Model 715 type
fixed slit assemblies, the following procedure should be
used in order to change slit widths. First, at least one
additional fixed slit plate, Model 715-4-XX or 715-14-XX,
must be available to permit changing widths in the 715 type
slit assemblies.
Changing Fixed Slit Plates in the 750-715-1
and 750-715-2 Assemblies:
1. Remove any accessories from the slit body.
2. Using an allen wrench, loosen the two slit plate screws
which hold the slit plate to the slit body. Remove the slit
plate without contacting the slit blades. Store the
removed slit plate in a clean, dry area.
Standard Model 715 Fixed Slit
Assembly
NOTE: Optical Axis Position
Note: Align the new slit plate to the SP-750i optical axis by
orienting it so that the slit width label is upright and readable.
When correctly mounted, the slits are off-centered height-wise,
slightly above the center of the slit body. See the slit assembly
drawing in the appendices section for details, or pictures on this
page for reference.
3. Place the new slit plate in the slit body and secure
it in position using the slit plate screws. The cone
shaped holes in the slit plate are designed to align
the slits to the optical system.
4. The slit width has now been changed.
Fixed Width Slit Plate
Note Orientation for Correct Installation
9
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