Electronic Load - Agilent Technologies 6611C Service Manual

NOTE: Connector
is removable
-
DVM, Scope, or
RMS voltmeter
+
(for CV tests)
-
DVM or
Current
RMS voltmeter
monitor
(for CC tests)
+
Note: Use dc supply with same polarity
connectons for - CC tests.
Replace electronic load with resistors
a.

Electronic Load

Many of the test procedures require the use of a variable load capable of dissipating the required power. If a variable
resistor is used, switches should be used to either; connect, disconnect, or short the load resistor. For most tests, an
electronic load can be used. The electronic load is considerably easier to use than load resistors, but it may not be
fast enough to test transient recovery time and may be too noisy for the noise (PARD) tests.
Fixed load resistors may be used in place of a variable load, with minor changes to the test procedures. Also, if
computer controlled test setups are used, the relatively slow (compared to computers and system voltmeters) settling
times and slew rates of the power supply may have to be taken into account. "Wait" statements can be used in the
test program if the test system is faster than the supply.
SENSE
-S -
+ +S
Local
Remote
+
50VDC MAX TO
-
Set to
Remote
- +
Electronic
Load
(see note)
for CC noise test.
Figure 2-1. Test Setup
Verification and Performance Tests - 2
-
DC
Ammeter
+
b.
-
DC
Ammeter
+
c.
SENSE
-S - + +S
Local
Remote
+
50VDC MAX TO
-
Set to
Remote
Load
resistor
400 ohm
SENSE
-S - +
+S
Local
Remote
+ 50VDC MAX TO
-
Set to
Remote
Load
resistor
400 ohm
+
-
External
DC supply
13