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TM 11-6625-2958-14&P

be set much closer to the operating

output voltage of the supply.

5-109 MAXIMUM CROWBAR TRIP VOLTAGE

5-110 To adjust the maximum voltage at which the

crowbar trips, proceed as follows:

a. Rotate A5R125 (OVERVOLTAGE ADJUST)

and CURRENT controls fully clockwise.

b. Disconnect either end of R72 (TP70 or

TP71; see Figure 7-10).

c. Connect decade resistance box in place

of R95 (mounted on standoffs on main circuit

board).

d. Turn on supply and adjust VOLTAGE con-

trols for output voltage shown below:

Model

Value

6259B 12Vdc

6260B

12Vdc

Model

Value

6261B 23Vdc

6268B

45Vdc

6269B

45Vdc

Adjust decade resistance box until crow-

bar trips (amber OVERVOLTAGE lamp lights up).

Replace decade resistance with appro-

priate value resistor in R95 position and reconnect

resistor R72. Maximum crowbar trip voltage is

now set at voltage given in Step (d).

5-111 CROWBAR DISABLEMENT

5-112 To disable the crowbar completely, discon-

nect either end of R98 (TP97 or TP98). This resis-

tor is mounted on the main circuit board (see Fig-

ure 7-10).

5-22

HP 6268B User Manual

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