Technical data

8 Service and Maintenance
Constant Current (CC) Verifications
206 E364xA User’s and Service Guide
10 Record the value displayed on the controller. This value
should be within the limit of:
11 Repeat step 1 through step 10 for the other output.
CC load effect (load regulation)
This test measures the immediate change in output current
resulting from a change in the load from the maximum
programmable value voltage to short circuit.
1 Turn off the power supply and connect the output to be
tested as shown in
Figure 8- 2 with the digital voltmeter
connected across the 0.01 Ω current monitoring resistor
(R
M1
).
2 Turn on the power supply. Select the low voltage range
(8 V/3 A)
[1]
, enable the output, and set the display to the
limit mode. When the display is in the limit mode,
program the output voltage to the maximum
programmable value and the output current to the full
rated value (3 A)
[1]
.
3 Set the voltage of the electronic load to full rated value
(8.0 V)
[1]
to operate it in the constant voltage mode since
a voltage drop occurs on the load wires. Check that the
CC annunciator is turned on. If it is not, adjust the load
so that the output voltage drops slightly. Record the
current reading by dividing the voltage reading on the
digital voltmeter by the resistance of the current
monitoring resistor.
E3646A E3647A E3648A E3649A
Output1 (I
O
±9.5 mA) (I
O
±6.2 mA) (I
O
±12.5 mA) (I
O
±7.1 mA)
Output2 (I
O
±14.5 mA) (I
O
±11.2 mA) (I
O
±17.5 mA) (I
O
±12.1 mA)
[1] For the E3646A model. For other models, refer to Tabl e 8 -5 .