ASP sterrad NX, Service & Troubleshooting Manual

Page: 118 / 126

7
System Calibration and Verification
4. Subtract the initial pressure from the final pressure. Divide this
difference by the duration (at least 10 minutes) to obtain system leak-
back rate in mtorr/min.
5. If this value is 25 mtorr/minute or less, the system passed. If not,
troubleshoot cause and retest. Record result on the test record sheet.
6. Turn on the vacuum pump and open the vacuum valve. Turn off the
pump and open the vent valve. This will allow the chamber and
vacuum pump to come up to atmospheric pressure without sucking
the oil out of the pump and into the chamber.
7. Exit the Vacuum/Plasma screen.
Plasma Power Delivery Verification
This section describes the steps for verifying the output of the LFPS II
against a traceable reference. This procedure requires the use of the
LFPS II Power Verification Meter (PVM).
1. Turn OFF the sterilizer and disconnect the power cable.
2. Disconnect the twin-axial cable from the LFPS II PSM and connect
this cable to the LFPS II PVM.
3. Connect one end of the 1-foot twin-axial cable to the LFPS II PSM.
Connect the other end of the 1-foot twin-axial cable to the LFPS II
PVM.
4. Connect the IEC 320 power cable to the PVM and turn the PVM on.
Connect the BNC to dual banana adapter to the PVM. Connect the
DVM to the PVM dual banana adapter.
5. Apply power to the sterilizer. Using the service log-in, run the
plasma test at 800 mtorr.
6. Read the output voltage on the DVM. Output should be between
3.82 - 4.79 VDC. If the output is correct, the test is complete. If the
output is not correct, troubleshoot the system and replace
components if needed.
118 STERRAD
®
NX
™
Service Guide