Maintenance, Service, & Calibration
EPM2000/EPM2000e Reference Guide
55
The buffer contains extra, incorrect pulse data.
Switching ranges on an EPM2000 can cause a trigger, which activates the A/D collectors. The
resulting data is stored in the buffer just like real data. Avoid this by keeping the EPM2000 set to
external trigger whenever possible. This only occurs when the EPM2000 trigger source is
internal.
How can "stale" data from a previous experiment be cleared from the buffer to avoid
contaminating data from a new experiment?
Prior to triggering a laser, execute an out dump command to assure that the buffer is
completely empty of stale data or false data from switching noise.
When collecting a statistical batch, the mean value is much lower than expected.
Raise the trigger level as high as possible without missing pulses. A trigger level that is too low
will trigger on and collect noise, which contaminates the batch.
When set to a low range, the EPM2000 doesn’t trigger on large pulses.
When determining a proper range for an unknown signal, always start at the highest possible
range and work downward from there.
The EPM2000 indicates a value, but there are no pulses arriving.
The EPM2000 will hold the last peak value measured, even if the pyroelectric/silicon probe has
been disconnected. Change ranges or units to clear the display.
While in Thermopile mode, the EPM2000 may not display an overrange condition, nor sound
an audible overrange alarm.
This is a known bug. Overrange will still be reported via the remote link as a value of 3.000.
Although the EPM2000 is in Ratio Mode, the buffer data, when in binary form, reports as
Channel A or Channel B data.
This is a result of the limited number of bytes available to describe channels. Use ch all
units ? to determine if the EPM2000 is in Ratio mode. If it is, then all data in the buffer is ratio
data. The channel refers to the numerator of the calculation.
Binary ratio data from the EPM2000's buffer is slightly off from the same data reported via
ASCII+.
This is a known bug. Until a revision is released, read Ratio data using ASCII+ data or simply
transfer raw data from the EPM2000 and calculate the ratio using the terminal computer.
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