HP 6268B Operating And Service Manual

2-17 INPUT LINE VOLTAGE OR
FREQUENCY CONVERSION
2-1 8 Converting a 230-volt instrument to 208-volt
operation is simply a matter of changing some taps or
jumper connections on main power transformer T1 and bias
transformer A3T2. Converting to 11 5-volt operation is
more involved. The Models 6259B, 6260B, 6261 B, and
6268B require an added resistor and some jumper changes
in the A2 RFI assembly and a changed A3T2 transformer
tap. In addition, the 6260B, 6261 B, and 6268B need a
replacement circuit breaker, and the 6260B needs a replace¬
ment T1 power transformer. Complete line voltage con¬
version instructions are given in paragraphs 2-20 through
2-27.
2-19 Converting a 60Hz instrument to 50Hz operation
requires that one resistor be replaced and some adjustments
be made. Line frequency conversion instructions are given
in paragraph 2-28.
2-20 Converting a Standard Instrument to 208-
Volt Operation (Models 6259B, 6261B and 6268B).
2-21 To convert these 230-volt instruments to 208-volt
operation, proceed as follows:
a. Disconnect instrument from power source and remove
top and bottom covers.
b. Remove A2 RFI assembly as described in steps (a)
through (c) of paragraph 5-65. This provides access to bias
transformer A3T2 (see Fig. 7-2).
c. Locate the wire that connects circuit breaker CB1 to
the A3T2 bias transformer terminal marked "230V”,
disconnect it from the transformer, and reconnect it to
the terminal marked "208V". Leave the wire from fan B2
(not used in the 6259B) connected to the terminal marked
"230V" (see Fig. 2-2B).
d. Re-install the RFI assembly by reversing the proce¬
dure of step (b) above.
e. Unsolder the wire connected to terminal 5 of power
transformer T1 and solder it instead to terminal 4 (see
Figure 2-3B).
2-22 Converting a Standard Instrument to 208-
Volt Operation (Models 6260B and 6269B).
2-23 To convert these 230-volt instruments to 208-
volt operation, proceed as follows:
a. Perform steps (a) through (d) of paragraph 2-21.
b. Unsolder the wire connected to the terminal marked
"230V" on power transformer T1 and solder it instead to
the terminal marked "208V" (see Fig. 2-4B).
2-24 Converting a Standard Instrument to 115-
Volt Operation (Models 6259B, 6261B and 6268B).
A
BIAS TRANSFORMER
(A3T2) CONNECTIONS
FOR 230 VOLT
OPERATION.
B
BIAS TRANSFORMER
(A3T2) CONNECTIONS
FOR 208 VOLT
OPERATION.
C
BIAS TRANSFORMER
(A3T2) CONNECTIONS
FOR 115 VOLT
OPERATION.
NOTE- X FAN B2 IS NOT USED
IN MODEL 62596
Figure 2-2. Bias Transformer Primary Connections
for 208Vac Operation (Modal 6259B, 6260B, 6261B,
6268B, and 6269B) and 115Vac Operation
(except Model 6269B).
2-2

HP 6268B Specifications

General

Brand	HP
Model	6268B
Category	Power Supply
Language	English