Naris
Naris
User’s
Manual V14 14/02/20 Page 24 of 52
COMMON PROBLEMS AND TROUBLESHOOTING
The principal problems are as follows:
a)
There is leakage in the pressure tube circuit. The trace is almost vertical an
d it’s only
when using the Broms technique that you can calculate results because the trace will
not reach the 75 Pa or 150 Pa sample point threshold line used in the standard
technique. Check the pressure tube connections to the patient and to the NR6 box
(black-ringed tube).
b)
There is leakage in the flow circuit. The trace is almost horizontal indicating a very high
resistance or little to no flow component.
c)
Check the mask fit and that the tube runs between the flowhead and the NR6 box (red
and green). Check that the black mask port is capped when doing an anterior test.
d)
The spot does not move when a pressure or flow is applied, or moves in a very erratic
way. This suggests that the A/D card has not been installed properly (has it been set to
Board 0?), or there is no connection between the NR6 and the PC (Is the green light on
the front of NR6 illuminated)?
e)
There is no response on the screen to flow or pressure input, but the connections are
intact and the light on the front of the instrument is lit.
1)
Check that the USB cable is in place, linking the NR6 and PC.
2)
Run the program Instacal to ensure that the NR6 USB module has been
recognised by the PC (see software manual)
3)
Check that the PC has not been allowed to go into sleep or power down
mode.
If the PC has been allowed to go in to sleep mode, the USB interface is powered
down. When brought out of sleep mode, the PC does not re initialise the USB
interface, and therefore it is effectively not present. One solution is to remove
the USB connection at the PC or instrument side then re-connect. That may be
sufficient, but if not, save any results, and close down the instrument software
and restart it.
