Verification and Performance Tests 5
Performance Verification Tests
U3606A User’s and Service Guide 169
5 Operate the electronic load in constant resistance mode, and set its
resistance to 2.5 Ω . Ensure that the U3606A is operating within the
specified limit and protection values. If not, adjust the electronic load
by reducing the resistance so that the voltage drops slightly until the
U3606A is operating within the specified limit and protection values.
6 Output the full rated value in the order shown below. Divide the voltage
drop (reading on the digital multimeter) across the current monitoring
resistor by its resistance. Record the output current reading on the
digital multimeter.
7 Within a few seconds after step 6, operate the electronic load in short
mode. Record the output current reading on the digital multimeter.
8 Compare the difference between the measurement results to the
appropriate test limits shown in Table 5- 13.
CC source effect (line regulation)
This test measures the change in output current that results from a
change in AC line voltage from the minimum value to the maximum value.
1 Turn off the instrument and connect a 0.01 Ω current shunt monitoring
resistor across the front panel (red) and (black) output terminals
and a digital multimeter across the current shunt monitoring resistor
(see Figure 5- 10 on page 151).
2 Connect the AC power line through an AC voltage source. Adjust the AC
voltage source to provide nominal input voltage to the instrument.
3 Turn on the instrument. Press Current to select the constant current
mode. Ensure that the S2 (8 V/3 A) range is selected (the S2
annunciator is illuminated). Press Shift > Range again if it is not.
4 Set the output current to the full rated value (3 A for S2 range) and
voltage to full scale. Enable the output.
5 Connect an additional electronic load across the front panel (red)
and (black) output terminals (see Figure 5- 10 on page 151).
Table 5 - 13 Constant current load effect verification test
Output current Range Error from nominal 1 year
3 A with 2.5 Ω load 3 A ±0.0012 A
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