iSpin-NMR
that is on for 10.0 μs. The amplitude of the sinusoid depends on the attenuation of the
RF output signal. This will repeat 100 times every 0.5 seconds and then stop. The
diagram in Figure 8, on the following page, shows what a typical oscilloscope output will
look like for this test.
6. Repeat this test a few times, increasing the amplitude setting until you reach your
desired output power (up to a maximum of 1.0). The output power should not exceed
10W RMS for a PA10W, 15W RMS for a PA15W, etc.
7. To test the
Receiver
, edit the following parameters in the singlepulse_nmr_example.bat
file:
•
NUMBER_OF_SCANS = 1
•
NUMBER_POINTS = 16384
•
SPECTROMETER_FREQUENCY = 20.001
(MHz)
•
SPECTRAL_WIDTH = 50 (
kHz
)
•
BYPASS_FIR = 1
•
FNAME = rx_test
Use the amplitude you determined in step 5 above.
2020-07-21
17
www.spincore.com
Figure 8: Representation of the oscilloscope output for the iSpin-NMR transmitter test.
The iSpin-NMR's internal RF power amplifiers requires a specific de-blanking time, for
each model, prior to the RF pulse for full output power . The de-blanking time for
each power amplifier can be found in the RF power amplifier manuals, which can be
http://spincore.com/products/RFPA/RF-Power-Amplifier.shtml
De-
blanking
Signal
RF
Output
De-blanking Delay
Pulse Time
