Ophir Optronics Ltd QSR Manuel D’Utilisation
Chapter 4 – Measuring with the Thermopile Head
Configuring Measurement Settings in Power Mode
Selecting the Range
Thermopile heads cover a wide range of powers, from microwatts to 1000s of
watts, depending on the type of head in use. In order to provide accuracy at each
end of the range, the electronics of the USB Interface Unit must be configured to
work in a range that is most suited to your needs.
watts, depending on the type of head in use. In order to provide accuracy at each
end of the range, the electronics of the USB Interface Unit must be configured to
work in a range that is most suited to your needs.
To configure the range when you know the approximate range of the
expected readings:
expected readings:
1. Select the range from the Range drop down list in the Measurement
Parameters Area. The instrument will configure itself according to the
selected range.
selected range.
Figure 4-3 Range Drop Down List
To configure the range when the range of the expected readings is not
known, or if highly varying readings are expected:
known, or if highly varying readings are expected:
1. Select AUTO from the Range drop down list in the Measurement
Parameters Area. The instrument will configure itself according to the
selected range.
selected range.
Note: AUTO instructs the instrument to configure itself in the lowest range
possible that is higher than the latest readings. If the readings exceed
100% of the present range, the instrument reconfigures itself for the
next higher range. If the readings fall below 9% of the present range,
the instrument reconfigures itself for the next lower range after a short
delay. The delay prevents an infinite range-changing loop when
readings are close to the end of the scale.
100% of the present range, the instrument reconfigures itself for the
next higher range. If the readings fall below 9% of the present range,
the instrument reconfigures itself for the next lower range after a short
delay. The delay prevents an infinite range-changing loop when
readings are close to the end of the scale.
Averaging the Measurements
The thermopile head is measured 15 times a second. StarLab automatically
refines your readings and applies a moving average.
refines your readings and applies a moving average.
When you set the channel to average mode, StarLab displays the average of the
readings spanning from the last time average mode was activated, to the present.
Once the time period of the average is reached, the average becomes a running
average, spanning the average period backwards in time. For example, if the
average period is 30 seconds, at 15 seconds, the average is over 15 seconds; at 30
seconds, the average is over 30 seconds; at 5 minutes, it is over the period from 4
minutes and 30 seconds to 5 minutes (30 seconds back from the present).
readings spanning from the last time average mode was activated, to the present.
Once the time period of the average is reached, the average becomes a running
average, spanning the average period backwards in time. For example, if the
average period is 30 seconds, at 15 seconds, the average is over 15 seconds; at 30
seconds, the average is over 30 seconds; at 5 minutes, it is over the period from 4
minutes and 30 seconds to 5 minutes (30 seconds back from the present).
StarLab User Guide
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