JQE SPECIAL SVC 092611
6-5/(6-6 Blank)
6.4.2
MEASUREMENT INSTRUCTIONS
a. Output Voltage Measurement. The principle governing this method of measurement is sim-
ple: DO NOT MEASURE ANY VOLTAGE DROPS DUE TO LOAD CURRENT FLOW. This
can only be avoided by measuring regulation directly at the sensing leads.
b. Source and Load Effect in Voltage Mode is defined as the amount of output voltage change
resulting from a specified change of line voltage or from a change in load resistance. It can
be expressed as an absolute change
∆
E
O
or as a percentage in reference to the total output
voltage E
O
:
c. Current Source and Mode Effect in Current Mode is defined as the amount of output current
change resulting from a specified change in line voltage or from a change in load resistance.
I t can be expressed as an absolute change
∆
I
O
, or as a percentage in reference to the total
output current I
O
:
d. RMS ripple may be monitored on a true RMS-reading instrument connected in parallel with
the regulation analyzer leads. Careful wire dressing and shielding, as well as good a-c
grounding are of the utmost importance if valid measurements are expected. An oscilloscope
may also be used for p-p readings of noise and ripple. An approximate RMS reading can be
calculated from the p-p reading of the oscilloscope if the reading is divided by three.
% Voltage Effect
∆
EO
EO
------------
100 %
×
=
% Current Effect
∆
IO
IO
-----------
100%
×
=
