ISR300 Single Monochromator

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The ISR300 single monochromator offers a wide single scan spectral range with the advantage of motorised slits to maintain and select measurement bandwidth throughout.

Built around a 300mm focal length, triple-grating turret Czerny-Turner monochromator, the ISR300 has two exit ports, selected by a solenoid-based swing away mirror, allowing the specification of up to two system detectors. Grating drive control electronics are located to the base of the unit alongside the signal recovery electronics, including dual-channel picoammeters and a high voltage power supply for operation of detectors in the photoemissive or photoconductive modes.

The ISR300 is a single unit with a lot of talents, ready for deployment in a number of applications.

Core benefits

Wide spectral range covered in single scan
Benefit of a single-unit solution
High accuracy across
UV-vis-IR applications

Features

300mm focal length monochromator in Czerny-Turner mount
Triple grating turret
One entrance and two exit ports, all motorised with automated mirror-based selection
Integrated drive electronics, dual-channel picoammeter and high voltage power supply
Compatible with the full range of sources, detectors and accessories of the Bentham portfolio
Fully automated through USB 2.0 interface

Optical Layout

Configuration	Symmetrical Czerny Turner
Focal length	300mm
Grating mount	Triple grating turret
Number of gratings	1-3
Grating size	68 x 84mm
Aperture ratio	f/4.1 (at all grating angles)
Number of entrance/ exit ports	1/2 or 2/1

Opto-Mechanical

Mechanical resolution drive	0.00072°/ step
Slit type	Internal motorised variable
Slit width & height	10µm-10mm (W) x 20 (H)
Filter size	6-position filter wheel
Filter diameter	25mm (see separate Order Sorting Filter datasheet for full range)

Optical Performance (quoted for 1200 g/mm gratings)

Spectral range	Within range 200nm-50µm
Linear dispersion	2.7nm/mm
Wavelength accuracy	± 0.2nm
Wavelength reproducibility	± 0.05nm
Resolution full/reduced slit height	0.3/0.1nm
Stray light rejection at 2.5 FWHM	10^-5
Wavelength acquisition speed	1000nm/s

Automation

Computer interface	USB 2.0
Software control	BenWin+/SDK

Electrical/ Mechanical

Overall dimensions	328L x 375W x 263H mm
Optical height	178mm
Weight	Approx. 15kg
Power supply	Mains input 110/220V 50/60Hz

Options

Diffraction gratings	See Configurations Tab
Order sorting filters	See Configurations Tab
Filter wheel	252-6 (6-position filter wheel, includes shutter)

487 Dual-Channel Picoammeter Module - Electrical

Channel 1 input	Current input to picoammeter
Channel 2 input	Current input to picoammeter
Gain ranges	10¹⁰-10⁵ V/A
Maximum current input	100µA
Frequency response	DC to 30Hz
Gain accuracy	+1%
Gain stability	200ppm/°C
Output stability	5ppm/°C to 500ppm/°C depending on sensitivity
Linearity	< 0.025% departure from linearity from zero to full scale
ADC resolution	4½ digit BCD (0 to 19999) i.e. > 14 bit resolution
ADC integration time	100ms
Auxiliary input range	0- 9.8V
Picoammeter input impedance	Virtual earth
Auxiliary input impedance	1 MΩ

415 High voltage Power Supply Module - Electrical

Output voltage range	-350 to -1500V
Maximum current	1.5mA
Temperature stability	100 ppm/°C
Stability to voltage fluctuations	25ppm for 10% change in line voltage
Ripple and noise	100ppm peak-peak

Monochromator Configurations

ISR300 Configuration A
ISR300 Configuration B

Diffraction Gratings

Where a system is to be used over an exceptionally wide spectral range, requiring more than 3 diffraction gratings, interchangeable turrets are employed; the stepping motor in this case drives a platform to which the grating assembly is attached.

Grating	Line density (g/mm)	Grating type & Blaze wavelength	Maximum wavelength range
GA-T324R0U25	2400	Plane ruled, 250nm blaze	200nm-600nm
GA-T324H0U25	2400	Plane holographic, 250nm blaze	200nm-600nm
GA-T324H0U3	2400	Plane ruled, 300nm blaze	200nm-600nm
GA-T318H0U25	1800	Plane holographic, 250nm blaze	250nm-900nm
GA-T318R0U4	1800	Plane ruled, 400nm blaze	250nm-900nm
GA-T318R0U5	1800	Plane ruled, 500nm blaze	250nm-900nm
GA-T312H0U25	1200	Plane holographic, 250nm blaze	300nm-1.2µm
GA-T312R0U4	1200	Plane ruled, 400nm blaze	300nm-1.2µm
GA-T312R0U5	1200	Plane ruled, 500nm blaze	300nm-1.2µm
GA-T312R0U75	1200	Plane ruled, 750nm blaze	300nm-1.2µm
GA-T312R0U9	1200	Plane ruled, 900nm blaze	300nm-1.2µm
GA-T312R1U0	1200	Plane ruled, 1µm blaze	300nm-1.2µm
GA-T3083R1U2	830	Plane ruled, 1.2µm blaze	600nm-1.8µm
GA-T306R1U0	600	Plane ruled, 1µm blaze	800nm-2.5µm
GA-T306R1U25	600	Plane ruled, 1.25µm blaze	800nm-2.5µm
GA-T306R1U6	600	Plane ruled, 1.6µm blaze	800nm-2.5µm
GA-T306R1U9	600	Plane ruled, 1.9µm blaze	800nm-2.5µm
GA-T306R2U16	600	Plane ruled, 2.16µm blaze	800nm-2.5µm
GA-T304R1U6	400	Plane ruled, 1.6µm blaze	1µm-3µm
GA-T303R3U0	300	Plane ruled, 3µm blaze	1.5µm-5.5µm
GA-T303R4U0	300	Plane ruled, 4µm blaze	1.5µm-5.5µm
GA-T3015R4U0-AU	150	Plane ruled, 4µm blaze. Gold coated.	3µm-10µm
GA-T3015R6U0-AU	150	Plane ruled, 6µm blaze. Gold coated.	3µm-10µm
GA-T301R9U0-AU	100	Plane ruled, 9µm blaze. Gold coated.	4.5µm-16µm
GA-T30075R10U0-AU	75	Plane ruled, 10µm blaze. Gold coated.	6µm-20µm
GA-T30075R12U0-AU	75	Plane ruled, 12µm blaze. Gold coated.	6µm-20µm
GA-T3005R18U0-AU	50	Plane ruled, 18µm blaze. Gold coated.	9µm-30µm
GA-T3005R19U5-AU	50	Plane ruled, 19.5µm blaze. Gold coated.	9µm-30µm

Filters

An order sorting filter wheel is located inside the entrance port of the monochromator, fitted with 6 filters selected for the spectral range of use.

When measuring below 400nm, no filters are required as the corresponding wavelength of the subsequent diffraction order is less than 200nm, which is naturally blocked by the atmosphere.

Spectral range	Required OS filter
<400 m	None
400-700nm	OS400
700-1250nm	OS700
1250-2000nm	OS1250
2000-3600nm	OS2000
3.6-6 µm	OS3600
6-10.5 µm	OS6000
10.5-21 µm	OS10500
> 21µm	Please consult.

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