Log entry time 04:17:26 on May 28, 2009

Entry number 277004

When I came to shift tonight I checked the gauges for the 
reference cell, and they were showing following values:

LEFT GAUGE: 757 - 782 Torr
RIGHT GAUGE: 009 Psig

If I convert these numbers in to [bar] units (Easier for me to 
understand) I get following values:

LEFT GAUGE: 777Torr = 1.026 bar
RIGHT GAUGE: 9 psig = (9+15)psi = 1.65 bar

When Jin called me, I asked him about this difference and
he told me that there is a know problem with the gauge offsets.
He suggested me to do some calibration measurements. 

Here are the results :

 What Miha did         |  Left Gauge [Torr]  |  Right Gauge [psig]
=================================================================== 
In the beginning       |  757 - 782          |   009 
                       |                     |
Vented the target      |  756(7)             |   -002(3)
                       |                     |
Evacuated the target   |  -002               |   -017
                       |                     |
N2 to atm. press       |  886                |    000
===================================================================
Vented target again    |   757               |   -002(3)
                       |                     |   
Evacuated the target   |  -002               |   -017
                       |                     |
N2 back in             |   343               |    -010
                       |   617               |    -005
                       |   864               |     000
                       |   723 - 744         |     005
                       |   774 - 789         |     010

In the end of "my little experiment" I put again 10psig of N2 
into the reference cell.