Agilent Technologies 85330A service manual Switching from the Internal to External Power Supply

Service

Adjustments

Switching from the Internal to External Power Supply

This set of jumpers sets the 85330-60002 card to use in the internal VXI power supply to bias the remote RF switches and Switch Control Units, or to use the AUX POWER IN connector to bias the switches and SCUs. The internal power supply is used when there is few SCUs and RF switches. The AUX POWER IN is used when there are a large number of switches and SCUs, or if the switches require a special dc voltage, or to compensate for losses in a long Local Control Cable. The default is the internal power supply.

To set these jumpers, perform the following on the 85330-60002 card. This card must be removed before changing this switch. Refer to “Assembly and Disassembly” on page 9-19for information on removing the card.

1.Locate the jumpers W1 and W2 near the rear panel of the 85330-60002. They will be next to the AUX POWER IN connector.

2.To set the card to the internal supply, the W1 jumper should go from +12V to INT, and the W2 jumper should go from −12V to INT.

3.To set the card to the AUX POWER IN supply, the W1 jumper should go from +12V to AUX, and the W2 jumper should go from −12V to AUX.

Table 9-10 AUX Power In Connector Pinouts (as looking at rear of 85330-60002)

Pin 10	Pin 9	Pin 8	Pin 7	Pin 6
−12 V	+12 V	+12 V	+12 V	+12 V
Pin 5	Pin 4	Pin 3	Pin 2	Pin 1
−GND	+GND	+GND	+GND	+GND

Required Mating Connector

A Molex Mini-Fit Jr model 5557 (Molex p/n 39-01-2105) receptacle is required. At least three wire crimp terminals are required: 4.2 mm Pitch Mini-Fit Family Terminal-crimp, Female model 5556 (Molex p/n 39-00-0059).

9-24 85330A Multiple Channel Controller