The M300 is a high quality general purpose grating monochromator designed for use the UV, visible and infra-red regions.

The instrument is easily purged for use down to 175nm while a range of easily interchangeable gratings allows operation to 30mm.

A built-in stepping motor and sine drive allow wavelength scanning to be completely controlled from a remote stepping motor drive unit PMC3B. The PMC3B can be controlled from any PC or computer via its IEEE-488 bus interface.

Alternative entrance and exit configurations ensure maximum flexibility of position in integrating spectroscopic systems. The unit is manufactured using a single main casting with rebated lid for optimum light-tightness and stability.

The use of an 1800g/mm grating in the visible region results in a higher resolution and light gathering power than is normally associated with an instrument of this size, while novel and effective internal baffling leads to a particularly low level of scattered light, which is further reduced in the visible region by the use of a holographic grating. The position of the collimating mirrors reduces rediffracted light.

A range of accessories including programmable order sorting filter wheels, detection systems, light sources, integrating spheres, telescopes, reflection/ transmission measurement stations, fibre optic probes and specialised software is available.

   
Specification (unit fitted with 1800l/mm grating used in first order)
Configuration Symmetrical Czerny Turner with alternative slit positions
Focal Length 300mm
Aperture ratio F/4.2
Slits Interchangeable fixed slits, micrometer adjusted, variable or motorised
Order sorting Unit can be fully order sorted from 200nm to 30µm by using option 252 and Bentham OS series of order sorting filters
Gratings 69mm2 plane gratings kinematically mounted to allow change-over without loss of calibration.
Resolution

M300HR: 0.15nm, M300E: 0.5nm

Maximum resolution obtainable is limited by misfocus in the collimating system. In the HR version, one of the collimating mirrors is mounted on a translation stage allowing fine positioning. All instruments are set up to achieve the specified resolution before delivery.

Stray light (at full aperture with 1nm bandwidth)

1.5 bandwidths from laser line: 0.18%

3.0 bandwidths from laser line: 0.025%

10.0 bandwidths from laser line: 0.004%

Light gathering capability 0.63 = slit height/(f number2 x dispersion) nm/mm
Wavelength scanning By integral stepping motor and microstepping drive electronics
Wavelength readout 4 digit display reading directly in nm with readability of .02nm
Wavelength step Each step of the stepping motor results in a wavelength change of .01nm for the HR version and .05nm for the E version
Maximum scanning speed

For 1800 g/mm grating,

M300HR: 4nm/s, M300E: 20nm/s

Wavelength accuracy

±0.2nm of the true throughput range

Dispersion 1.8nm/mm with 1800 grooves/mm grating
PC interface Integral IEEE-488
Power supply Mains input 110/220V 50/60Hz
Weight 12.3kg
Overall dimensions 235mm x 330mm x 192mm high
Construction Single aluminium casting with rebated lid