Freq Resp Option C75 Adjustment

This adjustment applies to the following models with Option C75:

In this adjustment, flatness corrections are turned off. Amplitude error versus frequency of the analyzer’s 75 ohm input is measured at 10 dB attenuation for preamp off from 1 MHz to 1.5 GHz.

The flatness corrections for 50 ohm input stored initially in the analyzer’s memory are used in computing the flatness corrections for 75 ohm input. The path loss between 50 ohm and 75 ohm inputs at 10 dB attenuation for preamp off from 1 MHz to 1.5 GHz is determined, and used with the flatness corrections for 50 ohm to generate flatness corrections for 75 ohm input for each attenuator step for both preamp off and on. The data is then stored in memory.

The related functional test for this adjustment is Frequency Response (Option C75).

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Required Test Equipment

Test Equipment

Recommended Model Number

RF Signal Generator

PSG Models

(see equipment list)

Power Meter

N1914B

RF Power Sensor

N8482A

75 W Power Sensor

8483A

RF Power Splitter

11667A

Minimum Loss Pad
(50 W to 75 W)

11852B Option 401

Type-N Cable

11500C

BNC Cable

8120-1840

Type-N (m) to Type-N (m) adapter

1250-1475

Type-N (m) (50 W) to Type-N (f) (75 W) adapter

1250-0597

Type-N (f) (75 W) to Type-N (f) (75 W) adapter

Huber + Suhner 31_N-75-0-2 /133_NE

(Item no. 22542612)

3.5 mm (f) to Type-N (f) adapter
(for 3.5 mm source)

1250-1745

2.4 mm (f) to Type-N (f) adapter
(for 2.4 mm source)

11903B

Connection Setups

In the following setups, cables are designated as solid lines and direct connections are designated as dashed lines.

Power Meter Calibration

Splitter Characterization

 

Freq Resp Option C75 Adjustment Setup