16
Quick Reference Guide
Settings to optimize performance
Range
To achieve best accuracy, the Model 2520 should be on the lowest possible measurement
range. Use the RANGE
▲
and
▼
keys to select the range after pressing the appropriate
measurement function key (V
L
or I
PD
). Available detector current measurement ranges are
10mA, 20mA, 50mA, and 100mA, while available laser diode voltage measurement
ranges are 5V and 10V.
NOTE
Basic ranging information (including the SCPI commands for remote operation)
is covered in
“Basic operation,” page 13
.
Filter
Filtering stabilizes noisy measurements caused by noisy input signals. The Model 2520
uses an averaging type filter for all three measurements. The number of readings averaged
can be set between 1 and 100. However, the more filtering that is used (higher number of
readings averaged), the slower the measurement process becomes.
When the averaging filter is enabled, the unit cycles through the complete delay-pulse
cycle for each filter sample measurement. The measurement results for all delay-pulse
cycles are then averaged to give one “filtered” reading. If the filter is enabled in sweep
mode, each step of the sweep will effectively be repeated for the filter count number of
times.
NOTE
The average filter setting is global and affects all three measurements (laser
diode voltage and both detector current measurements).
Filter configuration
Press CONFIG > FILTER > use edit keys to set COUNT.
Press the FILTER key to enable the filter. The FILT annunciator will be on when the filter
is enabled.
