The Varian Unity Plus 500-MHz Nuclear Magnetic Resonance (NMR) spectrometer is a narrow-bore system equipped with a Varian Unity Plus console. The instrument is used primarily to determining the three-dimensional structures of small proteins in solution by multidimensional NMR. The Oxford magnet is supported on a pneumatic anti-vibration table (not shown). The console is equipped with three radio frequency channels and a Z-axis gradient amplifier. Solutions probes include a H¹{C¹³}{N¹⁵} triple resonance probe. This is a proton observation probe with both Carbon and Nitrogen decoupling coils. The console is controlled by a Sun Ultra 10 computer connected to the network.

The 500 MHz NMR Spectrometer is equipped with the following:

1. Narrow bore Oxford magnet
2. Highband 1^st and 2^nd Channels with frequency ranges of 12 - 609.5 MHz and 499.5 - 500.5 MHz
3. Broadband 3^rd Channel with frequency ranges of 12 - 309.5 MHz (Both with a resolution of 0.1 Hz)
4. 50W (pulsed) high band linear amplifiers for the ¹H/¹⁹F channels
5. 300 W (pulsed) broadband linear amplifiers (12 - 200 MHz, and 150 W for 200 - 245 MHz)
6. Two additional 300W (pulsed) broadband linear amplifiers (300 W at 12 - 200 MHz, 150 W for 200 - 245 MHz) on the 3rd channels
7. A Performa II Pulsed-Field Gradient modules which provide > 30 gauss/cm
8. Deuterium decoupling accessories
9. VT control
10. Ultrashims II
11. Waveform generators on each channel (for shaped and comp. pulses)
12. High sensitivity, low noise GaAs FET preamplifiers for ¹H/¹⁹F
13. A ²H lock with computer-controlled lock gating (for deuterium decoupling experiments)
14. A 16-bit ADCs, 500 kHz spectral widths and full quadrature with simultaneous sampling and oversampling

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