HP (Hewlett-Packard) 6205B ユーザーズマニュアル
sisters and the blocking capacitors and substitute
a higher gain vertical plug-in in place of the wide-
band plug-in required for spike measurements.
Notice that with these changes, Figure 5-7 be-
comes a two-cable version of Figure 5-6C.
band plug-in required for spike measurements.
Notice that with these changes, Figure 5-7 be-
comes a two-cable version of Figure 5-6C.
5-34
5-35
Transient Recovery Time.
Definition: The time “X” for output
voltage recovery to within “Y” mil-
voltage recovery to within “Y” mil-
livolts of the nominal output volt-
age following a “Z” Amp
step
change in load current - where:
“Y” is specified as 10 millivolts.
The nominal output voltage is de-
fined as the dc level half way be-
tween the static output voltage
before and after the imposed load
fined as the dc level half way be-
tween the static output voltage
before and after the imposed load
change, and “Z” is the specified
load current change, which is 5
Amperes.
A mercury-wetted relay, as connected in the
load switching circuit of Figure 5-8 should be used
for loading and unloading the supply. When this
load switch is connected to a 60Hz ac input, the
mercury-wetted relay will open and close 60 times
per second. Adjustment of the 25K control permits
adjustment of the duty cycle of the load current
switching and reduction in jitter of the oscilloscope
display.
per second. Adjustment of the 25K control permits
adjustment of the duty cycle of the load current
switching and reduction in jitter of the oscilloscope
display.
Figure 5-8.
Transient Recovery Time, Test Setup
TM 11-6625-2965-14&P
cury-wetted relay contacts. Switching of larger
load currents can be accomplished with mercury
pool relays; with this technique fast rise times
can still be obtained, but the large inertia of mer-
cury pool relays limits the maximum repetition rate
of load switching and makes the clear display of
the transient recovery characteristic on an oscillo-
cury pool relays limits the maximum repetition rate
of load switching and makes the clear display of
the transient recovery characteristic on an oscillo-
scope more difficult.
5-37 To check the transient recovery time of the
supply, proceed as follows:
supply, proceed as follows:
a .
Connect test setup shown in Figure 5-8.
b. Set METER switch to highest current
range and RANGE switch to lowest voltage mode.
c,
Turn on supply and adjust VOLTAGE con-
trols until front panel meter indicates exactly the
maximum rated output current.
maximum rated output current.
d. Close line on repetitive load switch set-
up.
e . Adjust 25 potentiometer until a stable
display is obtained on oscilloscope. Waveform
should be within the tolerances shown on Figure
5-9 (output should return to within 10mV of original
value in less than 50 microseconds).
5-9 (output should return to within 10mV of original
value in less than 50 microseconds).
Figure 5-9. Transient Recovery Time, Waveforms
5-38 OUTPUT IMPEDANCE
5-39 To check the output impedance, proceed as
follows:
a .
Connect test setup shown in Figure 5-10.
b. Set METER switch to highest voltage
range.
c .
Turn on supply and adjust VOLTAGE con-
trols until front panel meter reads 20 Volts.
d. Set AMPLITUDE control on oscillator to
10 Volts (E
in
), and FREQUENCY control to 100 Hz.
e .
Record voltage across output terminals
of the power supply (E
o
) as indicated on ac volt-
meter.
f. Calculate the output impedance by the
5-7