Current Sampling Resistor Connections; Constant Current Load Regulation Test Setup - HP 6269B Operator’s, Organizational, Direct Support And General Support Maintenance Manua L

TM 11-6625-2958-14&P
Figure 5-7. Current Sampling Resistor Connections
When using the HP current sampling
resistor recommended for this instru-
ment, an external fan must be employed
to cool the resistor. This precaution
will maintain the sampling resistance
at a constant value.
may be obtained from the factory.
5-43 Rated Output and Meter Accuracy.
a. Connect test setup shown in Figure 5-8.
b. Turn VOLTAGE controls fully clockwise.
c. Turn on supply and adjust CURRENT con-
trols until front panel ammeter indicates maximum
rated output current.
d. Differential voltmeter should read 0.5 ±
0.01Vdc.
5-44 Load Regulation.
Definition: The change ∆ IOUT in the
static value of the dc output current
resulting from a change in load re-
sistance from short circuit to a value
which yields maximum rated output
voltage.
5-45
To check the constant current load regulation,
proceed as follows:
a. Connect test setup shown in Figure 5-8.
b. Turn VOLTAGE controls fully clockwise.
c. Adjust CURRENT controls until front panel
meter reads exactly maximum rated out voltage.
d. Read and record voltage indicated on dif-
ferential voltmeter.
e, Short circuit load resistor (RL).
f. Reading on differential voltmeter should
not vary from reading recorded in Step (d) by more
than the following:
6259B
6260B
6261B
6268B
6269B
NOTE
110µv
110µv
110µv
134µv
120µV
Figure 5-8. Constant Current Load Regulation
5-46 Line Regulation.
Definition:
static value of dc output current re-
sulting from a change in ac input volt-
age over the specified range from low
line (usually 207 volts) to high line
(usually 253 volts), or from high
line to low line.
5-47 To check the line regulation, proceed as fol-
lows:
a. Utilize test setup shown in Figure 5-8.
b. Connect variable auto transformer between
input power source and power supply power input.
c. Adjust auto transformer for 207Vac input.
d. Turn VOLTAGE controls fully clockwise.
e. Adjust CURRENT controls until front panel
ammeter reads exactly maximum rated output current.
f. Read and record voltage indicated on dif-
ferential voltmeter.
g. Adjust variable auto transformer for 253V
ac input.
h. Reading on differential voltmeter should
not vary from reading recorded in Step (f) by more
than the following:
6259B, 6269B
6260B, 6261B
5-48 Ripple and Noise.
Definition: The residual ac current which
is superimposed on the dc output current
5-8
Test Setup
The change ∆ IOUT in the
120µV
110µV
6268B 134µV