LI-COR LI-7815, Instruction Manual

Page: 59 / 98

Device Compatible IP Addresses
LI-78xx 172.24.1.1
PC 172.24.1.2 through 172.24.1.255
Device Compatible IP Addresses
LI-78xx 192.168.1.1
PC 192.168.1.2 through 192.168.1.255
5 Connect with the instrument by entering the host name in a web browser address bar.
6 Now you can change the instrument IP address settings to whatever you prefer. Connection issues
will be resolved if you set both the instrument and your computer to
automatic
.
Note: You must reconnect after changing the instrument IP address.
Measurement problems
Here we describe issues related to the display of data or measurements.
Readings drift or step change unexpectedly
Constricted inlet or outlet? If one of these becomes constricted, you will observe
errant measurements, with corresponding status codes that indicate problematic pres-
sure measurements (see
Status codes on page 2-9). Clear the constriction and the
instrument should return to normal operation in a few minutes. Restart the instru-
ment if it does not resume normal operation within a few minutes.
Pressure readings are questionable or unstable
Clogged air inlet filter? Check and replace the filter if needed, as described in Repla-
cing the air inlet filter on page 6-4. Otherwise, unstable pressure readings may indicate
that the pump is failing. Contact technical support if the issue is not resolved by
replacing the filter.
Gas density measurements appear to have oscillations
In older firmware, regular, periodic oscillations in the data may appear in cir-
cumstances where there are vibrations that are effectively coupled to the instrument
sampling frequency. Typically, these oscillations are small and the measurements are
still within the noise specification.
Section 5. Troubleshooting
5-5 Measurement problems