LO Output Power Accuracy Option EXM Performance Test

This test verifies that EMI receivers equipped with External Mixing (Option EXM) meet their specification for LO output level. The 11970 Series mixers require LO drive levels in the +14.0 to +18.0 dBm range.

In this test the DUT is placed in external mixing mode using a harmonic number of –1, or +1. The center frequency is tuned from 4.0 to 8.4 (Doubler off) or 8.1 to 13.8 GHz (Doubler on). A power sensor is connected to the External Mixer port on the DUT and the LO power is measured.

LO Output Power Accuracy test can no longer be run outside of 20–30 °C.

Required Test Equipment

Test Equipment

Model Number1

Power Meter

N1914A

Power Sensor

N8485A

Adapter, 3.5 mm (f) to Type-N (m)

  • For power sensor

08485-60005

Adapter, 3.5 mm (m) to 3.5 mm (f)

83059C
  1. Refer to the main Required Equipment table for a list of alternative models.

Connection Setups

Power Meter Calibration

LO Output Power Accuracy Test Setup

Occasionally, due to manufacturing tolerances, the front panel may prevent the power sensor from fully seating on the External LO Connector. If this situation occurs, a 3.5 mm (m) to 3.5 mm (f) adapter (such as the 83059C) should be used to position the power sensor further from the front panel.