|Data Acquisition Delay (Time Offset)
||Computer selectable digital delay after trigger from 0 to 1048.56 µs in 16-ns steps. The record starts after the selected delay.
||End-of-Scan 0.8 µs.
End-of-Spectrum 0.8 µs.
||2 GHz ±5 ppm; temperature sensitivity: within ±2.5 ppm, 0ºC to 50ºC.
||Trigger Input within 500 ps (next clock pulse).
Trigger Output <50 ps FWHM. (The Trigger Output is alternatively delayed by 0 and 250 ps relative to the sampling clock in the 250 ps interleaved sampling mode.)
|Operating Temperature Range
||0 to 50ºC
||Linear summation of sequential records.
|Selectable Stop-Acquisition Limits
||Maximum Time 1 second to 65,535 seconds ( 8 hr.), in 1-second steps, or disabled.
Max. Number of Spectra > 18,000. Limited only by available memory in the supporting PC and the data storage disk.
||Implemented in the hardware with no compromise in data throughout.
LossiessCompression down to 2/3 the normal 24-bit file size
in spectra dominated by background, and with no loss of
Peak-Preserving and Background-Rejecting5
Automaticallly separates peaks from background. Transmits
peaks and adjacent background points. Typically decimates
98% of the background points between peak regions. Data
compression by a factor of 10 to 30, depending on peak
Peak Centroid and Net Area Tranmits only the centroid and
net area of automatically detected peaks. Provides an
additional factor of 9 data compression relative to Peak-
Preserving and Background-Rejecting compression.
|Maximum Data (Spectra) Transfer Rate
||Up to 100 spectra/s transferred to PC RAM and hard disk for a 50 µs spectrum length and 500 ps sampling in the Chromatograph/TOF-MS mode.
||Automatic hardware computation of real-time Chromatograph displays with each point in the chromatograph linked to the supporting time-of-flight spectrum. Provides exact time synchronization of the chromatograph with the TOP-MS when analyzing the output of an LC or GD. The vertical chromatograph coodinates is:
Total-ion Chromatograph The sum of the areas above
background for all peaks in each spectrum.
Specific-ion Chromatograph The net area above background
in the TOF-MS peak selected by the operator. Optional pre- and
||42 bits in the spectrum header are allocated to recording the starting time of each spectrum with 10 µs precision. Maximum: circa 1.4 years.
||21 bits in the spectrum header are allocated to recording the sequential spectrum number. Maximum limit is circa 2 million. Reset to zero on each acquisition start. Otherwise, this counter runs continuously, even when software stops reading the 32 MB FIFO output.
||During the last record in each spectrum the sum of all records in the spectrum is written to a one-spectrum-deep output buffer, and the summing memory is released to acquire the next spectrum. this limits end-of-spectrum dead time to 0.8 µs. After data processing in the compressor, the spectrum is loaded into a 32 MB output FIFO memory to accommodate intermittent data transfer over the USB-2 bus to the PC without loss of spectra. the output FIFO has a capacity of at least 7 spectra.
|Rapid Protocol Selection
||Provides a hardware interface to change acquisition parameters in real time with 10 µs. Includes 4 bits to select the hardware parameters defined in one of 16 products, and an additional 4 bits to insert one of 16 tags in the spectrum header. The tags can be used to identify unique acquisition conditions from other parts of the mass spectometer.