Table 5-2. PG&E Instrument Calibration History and Estimated Measurement Uncertainty.
  Channel  
#

  Measurement  


  Beginning
  Time Stamp  

  Instrument  


  Pre-  
  Calibration  

  Post-  
  Calibration  

  Comments  


  Estimated
  Measurement  
  Uncertainty(%)  
1

  Direct normal  
  (thermopile)
871100632
880190752
  Eppley NIP 25508E6  
  Eppley NIP 25510E6
1-86
12-87
8-88
--
0.3% change
--
2.8
3.6
2

  Global normal

871100632
880190752
  Eppley PSP 23202F3  
  Eppley PSP 23996F3
1-86
12-87
8-88
--
1.7% change
--
2.4
4.7
3

  Global horizontal  
  (thermopile)
871100632
880190752
  Eppley PSP 23995F3  
  Eppley PSP 25390F3
10-84
12-87
8-88
--
3.2% change
--
2.8
4.7
4

  Global tilt

871100632
880190752
  Eppley PSP 25387F3  
  Eppley PSP 23201F3
12-84
12-87
8-88
--
0.2% change
--
3.8
4.7
5
  Direct normal*(silicon) 871100632
  Matrix NIP 3818  
5-86
7-88
2.7% change
2.2
6   Temperature 871100632   Omega T-couple -- -- -- --
7

  Pressure

871100632

  Yellow Springs 2014-22/31  
  -HA-1-HW 15593

3-84

--

--

--
8   Relative humidity 871100632   Hygro. 14276 2-85 -- -- --
9

  Wind speed

871100632
880400737
  Weathertronics 2301 184  
  Weathertronics 2301 184
9-82
2-88
--
--
--
--
--
--
10   Albedo 871100632   Eppley PSP 21235F3 -- 8-88 2.4% change 2.6
19

  Global horizontal  
  (silicon)
871100632

  LI-COR Pyr. PY5558

11-83

8-88

1.9% change

2.6

  * Beginning about 87211, the silicon NIP values appear consistently low; may be an alignment problem.


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