Spectrum Analyzer Measurement Accuracy Verification - Anritsu Spectrum Master MS2721A Maintenance Manual

2.9. Spectrum Analyzer Measurement Accuracy Verification

The tests in this section verify the level accuracy of the Spectrum Master. There are two parts to this test:
· Level Accuracy across Frequency Test
· Level Accuracy through Power Test
Level Accuracy across Frequency Test
a. Equipment Required:
· Anritsu MG3692A Synthesized Signal Source with options 2A, 3, 4, 15A, and 22, or equivalent
· Anritsu ML2438A Dual Channel Power Meter or equivalent
· Anritsu MA2442A High Accuracy Power Sensors or equivalent (2)
· Anritsu ML2400A/20 Power Meter Cable (2)
· Weinschel 1870A Power Splitter or equivalent
· Anritsu 34NN50A 50 Ohm adapter or equivalent
· Anritsu 34RSN50 50 Ohm adapter or equivalent
· Anritsu 34RKNF50 50 Ohm adapter or equivalent
· Anritsu 15NNF50-1.5C RF Coaxial Cable or equivalent
· Weinschel 1-10 10 dB Fixed Attenuator
b. Test Setup Component Characterization
1. Turn on the power meter and signal source.
2. On the power meter, press the
Channel 2 setup menu. Press the
to display both Sensor A and Sensor B readings.
3. Connect the power sensors to the power meter and calibrate the sensors.
4. Connect the power splitter to the MG3692A output and Sensor B to one of the power splitter outputs.
5. Install the 10 dB Fixed Attenuator to the other power splitter output and then connect Sensor A to the end of the
Attenuator (Refer to Figure 2, page 18).
NOTE: Before continuing, allow a 30-minute warm up for the internal circuitry to stabilize.
6. Set the MG3692A output to the frequency listed in Table 6 starting with 50 MHz CW.
7. On the power meter, press the
to enter value matching the frequency of MG3692A as the input signal frequency, which sets the power meter to
the proper power sensor cal factor. Press the
8. Adjust the power level reading on Sensor A to –2 dBm by adjusting the power level on the MG3692A.
9. Record the sensor B reading in Table 6.
10. Repeat steps 5 through 8 for all of the frequencies in column 1 of Table 6.
11. Repeat steps 6 through 10 for a power of –30 dBm and record the results in Table 6.
Spectrum Master MM
key, the soft key and then the
Channel Setup
key twice to set the Input Configuration to B and press the
INPUT
key, the
Sensor Cal Factor
key on the power meter to display the power reading.
SENSOR
CHANNEL
soft key, and then the
FREQ
soft key to display the
key
Sensor
soft key. Use the keypad
17