Spectrum Analyzer Verification 2-9 Third Order Intercept (TOI) Verification
MT8212E and MT8213E MM PN: 10580-00255 Rev. J 2-21
2-9 Third Order Intercept (TOI) Verification
The following test verifies the Third Order Intercept point (also known as TOI or IP3) of the Spectrum
Analyzer in the MT821xE
Equipment Required
• Anritsu MG3692x Synthesizer (Quantity 2)
• Anritsu ML2438A Power Meter
• Anritsu MA2442D Power Sensor
• Fixed Attenuator, Aeroflex/Weinschel Model 44-2 (Quantity 2)
• Fixed Attenuator, Aeroflex/Weinschel Model 44-6 (Quantity 2)
• Fixed Attenuator, Aeroflex/Weinschel Model 44-20 (Quantity 2)
• Power Splitter, Aeroflex/Weinschel Model 1870A
• Adapter, Anritsu Model 34NN50A
• 10 MHz Reference Standard
Procedure for 800 MHz TOI
1. Connect the 10 MHz Reference from the frequency reference to the 10 MHz Reference input connections
of the two MG3692x synthesizers and the MT821xE.
2. Zero/cal the MA2442D Power Sensor, and set the calibration factor of the sensor to 800 MHz.
3. Connect the MA2442D Power Sensor to the input of the 1870A splitter.
4. Connect the 28 dB of Attenuation to each output side of the 1870A splitter.
5. Connect one MG3692x to one 28 dB attenuator, and connect the other MG3692x to the other 28 dB
attenuator. (The normal RF output connections will become input connections, and the normal input
connection will become the RF oputput connection.
6. Set one MG3692x to 799.951 MHz, and set the other MG3692x to 800.051 MHz.
7. Turn Off the RF Output of one MG3692x and turn On the other RF Output. Set the level of the MG3692x
that is On so that the MA2442D power sensor reads –20 dBm.
8. Turn Off the MG3692x that is On and turn On the MG3692x that is Off. Set the level so that the
MA2442D power sensor reads –20 dBm.
9. Disconnect the MA2442D from the splitter and connect the splitter to the MT821xE RF In port using the
34NN50A adapter.
10. Turn On the RF Output of the Synthensizer that is Off, so that both MG3692x synthesizers are On.
11. Press the On/Off key to turn On the MT821xE Cell Master.
12. Put MT821xE into Spectrum Analyzer Mode and Preset the instrument.
13. Using the Frequency menu, set the Center Frequency to 799.851 MHz
and set the Span to 100 Hz.
14. Using the BW menu, set the RBW to 10 Hz and set VBW to 1Hz.
15. Using the Amplitude menu, set the Reference Level to –15 dBm, ensure that the Pre Amp is Off, set
Attenuation Level to 10 dB, and press the Detection submenu key, and press RMS/Avg.
16. Using the Marker menu, press Peak Search and write down the level value.
17. Using the Frequency menu, set the Center Frequency to 800.151 MHz.
18. Using the Marker menu, press Peak Search and write down the level value.
Caution Before continuing, allow a 30 minute warm-up period for the internal circuitry to stabilize.
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