Appendix Service Information
Constant Current (CC) Verifications
190
6 Record the value displayed on the controller. This value should be within the limit of
(I
O
± 5 mA) for output1 or (I
O
± 10 mA) for output2.
7 Program the output current to the full scale rated value (3 A)
†
by sending the
command:
CURR 3.0
(E3646A model)
8 Divide the voltage drop (DVM reading) across the current monitoring resistor (R
M
)
by its resistance to convert to amps and record this value (I
O
). This value should be
within the limit of:
9 Readback the output current over the remote interface by sending the command:
MEAS:CURR?
10 Record the value displayed on the controller. This value should be within the limit of:
11 Repeat steps (1) through (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 full rated output voltage to short circuit.
1 Turn off the power supply and connect the output to tested as shown in
Figure A-1 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 (8V/3A)
†
, 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)
†
.
E3646A E3647A E3648A E3649A
3 A ± 16 mA 0.8 A ± 11.6 mA 5 A ± 20 mA 1.4 A ± 12.8 mA
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)
†
For E3646A model, and see Table A-3 for other models
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