① and observe

TM 11-6625-2965-14&P

SECTION Ill

OPERATING INSTRUCTIONS

3-1 TURN-ON CHECKOUT PROCEDURE

Figure 3-1. Front Panel Controls and Indicators

erational capabilities of the supply. A more theoretical description concerning these operational features is contained in Application Note 90 and in various Tech Letters. Copies of these can be obtained from your local Hewlett-Packard field office,

3-5 NORMAL OPERATING MODE

3-6 The power supply is normally shipped with its rear terminal strapping connections arranged for Constant Voltage/Current Limiting, local sens- ing, local programming, single unit mode of oper- ation. This strapping pattern is illustrated in Figure 3-2. The operator selects a constant voltage output using the front panel controls (local pro- gramming, no strapping changes are necessary).

3-2 The front panel controls and indicators are shown in Figure 3-1.The normal turn-on sequence, is described below:

A. Push ON/OFF button that button lights,

B. Set range switch ② to desired operating mode and meter switch to desired voltage range.

C.Adjust coarse and fine voltage controls

③until desired output voltage is indicated on meter.

D.Set meter switch to highest current range and short circuit output terminals.

E.Observe short circuit output current on

meter.

F.Remove short and connect load to output terminals (front or rear),

G.For Model 6205B, this procedure should be used for both sections of supply.

3 - 3 O P E R A T I N G M O D E S

3-4 The power supply is designed so that its mode of operation can be selected by making strapping connections between particular terminals on the terminal strip at the rear of the power sup- ply. The terminal designations are stenciled in white on the power supply above their respective terminals. Although the strapping patterns illustrated in this section show the positive terminal grounded, the operator can ground either termina1 or operate the power supply up to 300Vdc off ground (floating). The following paragraphs describe the procedures for utilizing the various op-

Figure 3-2. Norma 1 Strapping Pattern

3-7 CONSTANT VOLTAGE

3-8 To select a constant voltage output turn on the supply and, with no load connected, adjust the VOLTAGE controls for the desired output volt- age. To check the current limit, connect an external ammeter across the output of the supply, turn the VOLTAGE controls fully clockwise, and observe the reading. The current limit is factory adjusted to approximately 100mA above the current

rating of the supply.

If the

existing

current limit

is not compatible with the anticipated load re-

quirements, the

limit

can be

changed

as outlined

in the following

paragraphs.

 

 

3-1