Hi Friends:
We have an INOVA 500 MHz. I measured some numbers with a 300 MHz scope in 2003 and measured them again this week. There are some differences, especially the inputs to preamplifiers and probe. What information you can get from these numbers?
BTW, we are having 120Hz spikes on this spectrometer and believe this might be related to power. We are working on this.
Thank you very much for your help.
TN=C13
Measured on May 19, 2003 (V)
Measured on March 16, 2005 (V)
Synthesizer input to transmitter (J2x4 on xtmr1)
2.24
2.43
Transmitter output (J2x3 on xtmr1)
2.05
2.08
N channel attenuator output on J298
0.96
1
Input to X preamplifier
25.9
33.6
Input to X channel of the probe
22.7
30.2
TN=H1
Synthesizer input to transmitter (J2x4 on xtmr1)
0.93
0.82
Transmitter output (J2x3 on xtmr1)
0.92
0.8
N channel attenuator output on J297
0.42
0.36
Input to H/F OBS preamplifier
5.5
6.42
Input to H channel of the probe
4.94
5.88
Zhe Zhou, Ph.D.
Research Specialist (NMR)
Analytical Sciences, Dow Chemical Company
2301 N. Brazosport Blvd., B-1219
Freeport, TX 77541
Tel: 979-238-1387
Fax: 979-238-0752
Email: zzhou_at_dow.com
Received on Fri Mar 18 2005 - 10:46:59 MST