Keysight U3606B, Service Manual

Page: 56 / 123

1 Calibration Procedures
56 Keysight U3606B Service Guide
CC programming and readback accuracy
This test verifies that the constant current programming and readback accuracy
are within published specifications. The accuracy of the current monitoring
resistor must be 0.1% or better.
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 1-14, “Test
setup for constant current programming and readback accuracy verification,”
on page 36).
2 Turn on the instrument. Press [Current] to select the constant current mode.
Ensure that the appropriate range is selected.
3 Output each of 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 and compare the measurement results to the
appropriate test limits shown in Table 1-18 .
4 Repeat step 2 and step 3 for the S2 (8 V/3 A) and S1m (100 mA/30 V) ranges.
Table 1-18 Constant current programming and readback accuracy
verification test
Output current Range (parameter) Error from nominal 1-year
0 A
S1 (1 A)
±0.003 A
1 A ±0.0045 A
0 A
S2 (3 A)
±0.003 A
3 A ±0.0075 A
0 A
S1m (100 mA)
±0.00015 A
0.1 A ±0.0002 A