Electrical Tests. - SB-740-91-010294

SB 740-91-01

3. Inspection Requirements.

The mechanical-visual inspection defined in coded format in Appendix A-48 for NSN 5960-00-124-9544 (HAC 767H) and

5960-01-011-2698 (HAC 792H) are to be performed in addition to the Electrical Test of paragraph 4.

4. Electrical Tests.

The following tests are to be performed, using the applicable data sheet (figure 3-3) for these TWT's.

Caution

The voltages developed in this control unit are extremely dangerous.

During installation, operation and maintenance, follow the grounding

procedure given in these instructions carefully. It is absolutely necessary

that the ground pin of the input plug be connected to earth ground

through the mating female power-line receptacle.

Step

Setting and Instructions

Carefully place the TWT so that the ion pump is easily accessible. Keep the Vac Ion Pump control unit away from

ventilation outlets that might introduce contamination such as dust or corrosive material. Avoid excessively humid

locations.

Attach the shield leads (one from the cable assembly and one from the control unit) to the pump body under the

head of a magnet mounting bolt, see Figure B-1. Be sure to make good mechanical and electrical contact.

Attach the high voltage cable connector to the ion pump, see Figure B-1.

Connect the power cord to the power source receptacle.

Place the main power toggle switch in the ON position.

To monitor the control unit output voltage, place the Meter Range switch in the 5KV position. The output voltage

will depend on the amount of ion current being drawn; this is shown in Figure B-2.

B-104.2 Change 1