Anritsu ME7840A manual Connectors Ports

GENERAL INFORMATION SYSTEM DESCRIPTION

Connectors and

Ports

CAUTION

Connecting the external circulator incorrectly or placing a direct connection between C1 and C3 on MS4782D rear panel will cause permanent damage to MS462XC.

￿Bandwidth: Should be sufficiently wide to cover the frequency band of the AUT.

￿Isolation: Should be no less than (Po ￿27 dB), where Po is the power output in dBm of the AUT. Thus for Po = 47 dBm (50 watts), a 20 dB isolation is required. For a Po greater than 47 dBm up to 50 dBm (100 watts), two circulators in series can be used.

Where S22 or Hot S22 measurements are not required, power amplifiers with up to 100 watts average output power can be tested with the MS4782D Test Set without any circulator by connecting the through arm of the output coupler directly to the 100 watt termination (Port C1 con- nected to Port C2 on the rear. The unit is shipped from the factory with this loop jumper.)

For S22 measurements, the transfer switch located within the Scorpion routes the source 1 output signal to the output port of the AUT via Port 2 (RF2) of the Scorpion. A separate 100-watt coupler in the test set applies the –30 dB portion of this incident signal to the Scorpion reference port a2. The –30 dB portion of the signal reflected from the AUT output port is applied to the Scorpion test port b2 by means of the AUT output coupler.

The PATS calibration is performed with the test set in place, at the con- nectors where AUT will be connected directly. Therefore, the test set com- ponents and cables are included in the calibration loop and their effects are calibrated out, resulting in correct and accurate measurements of the AUT.

The software supplied by ANRITSU supports operator control of the source selection switch and step attenuator in the test set. This control is achieved through the parallel TTL control lines available at the Scorpion rear panel “External I/O” connector. The GPIB commands from the PC to the Scorpion set the TTL control lines to the desired states.

On the front panel of the Model MS4622/3C DRA Scorpion three Type N (female) connectors are provided for Ports 1, 2 and 3.

Port 1 provides RF source 1 when the transfer switch is in the forward position, and is terminated in 50 ohms to ground when the transfer switch is in the reverse position.

Port 2 provides RF source 1 when the transfer switch is in the reverse po- sition, and is terminated in 50 ohms to ground when the transfer switch is in the forward position.

Port 3 is allocated to RF source 2. Under independent control, port 3 pro- vides RF source 2, or is terminated in 50 ohms to ground.

On the rear of the unit, four SMA connectors (Figure 1-4)are provided for Reference ports a1 and a2 and Test Ports b1 and b2. The front of the unit as well as all other mechanical specifications is the same as the model MS4623B.

On the MS4782D Test Set, three additional SMA connectors provide for connecting an external circulator. If reverse measurements (S22 and Hot

ME7840A OMM 1-7