ment. Recovery time is a measure of how fast
b. Input Frequency.
Power Supply PP-
this change is suppressed. It is defined as the
3940/G may be operated over an input range
from 50 to 400 cycles per second (cps); how-
time necessary for the output voltage to affect
a 63-percent recovery from the percent max-
ever, all specifications are only at the nomi-
imum deviated value, based on a 10-percent
nal input frequency of 60 cps. The ripple volt-
line voltage change, or a 50-percent step
age will increase as the frequency varies from
change in load.
60 cps, becoming higher at the lower frequen-
cy extreme. The regulation accuracy and out-
d. Typical Overshot PP-3940/G.
put voltage range are also affected by the
36V 30V 20V 15V 10V 2V 0V
input frequency; their specifications are only
0 1.6V 3V 6V
at 60 cps.
c. Response Time. When an abrupt change
Note: Voltage drop between front and rear out-
occurs in the input voltage or output load, an
put terminals is approximately 95 millivolts.
instantaneous change in output voltage occurs.
e. Short-Term Drift. Short-term drift after
This instantaneous change is quickly sup-
15-minute warmup 0.05 percent typical.
pressed by the regulating action of the equip-