Ocean Optics LS-475 - Manual (Page 16)

3: Operating Instructions
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Enabling Pulse Mode on an S2000 Spectrometer
► Procedure
To enable Pulse Mode on the S2000 Spectrometer,
1. Remove your spectrometer from its housing. Do not tamper with the optical bench.
Note
If you have more than one channel in your system, you may have to disconnect the
channels from one another. The master spectrometer is always on the bottom of a
multiple channel system.
2. Locate jumper block 3 (JP3) in the center of the green circuit board. Jumper Block 3 consists of
10 pins labeled by rows (/16, /14, /12, /10 and 2). The configuration of these pins control the
pulse frequency on the A/D converter connected to the S2000. The default factory setting is /16.
3. Configure the jumpers in JP3 for the desired pulse frequency.
Table 1 illustrates the various configurations of JP3 pins and their associated pulses per second.
Table 1: JP3 Configuration and Pulse Frequency
S2000 JP 3 Post # DAQ 700
Frequency (Hz)
ADC500 / SAD500
Frequency (Hz)
ADC1000
Frequency (Hz)
/16 98.0 488.0 976.0
/14 24.0 122.0 244.0
/12 6.1 30.0 60.0
/10 1.5 7.6 15.2
For example, if you have an ADC1000 A/D converter, you have four choices for pulse frequency
from the LS-475: 976, 244, 60 and 15. If you choose to configure 244 pulses per second, place a
jumper over the pins next to the /14 label.
When using the pulsed flash mode, you must ensure that the number of flashes is constant for
every integration cycle. To achieve a constant number of flashes per integration cycle, the
integration time must be a multiple of that shown in Table 2. Integration times are set in the
OOIBase32 software. See the OOIBase32 Spectrometer Operating Software, Operating
Instructions for more information.