Chapter 3 Calibration Procedures
Constant Current (CC) Verifications
62
Normal Mode Current Noise (CC Ripple and Noise)
The normal mode current noise is specified as the rms output current in a frequency
range 20 Hz to 20 MHz with the power supply in constant current operation.
1 Turn off the power supply and connect the output to be tested as shown in Figure 3-1
with a load resistor (1.2Ω for +6V supply and 25Ω for ±25V supplies) across output
terminals to be tested. Connect a rms voltmeter across the load resistor. Use only a
resistive load for this test.
2 Turn on the power supply and select the output to be tested using the meter selection
key on the front panel. Enable the outputs and set the display to the limit mode. When
the display is in the limit mode, program the current to full-scale value and the voltage
to the maximum programmable value.
3 The output current should be at the full-scale rating with the CC annunciator on. If
not lit, adjust the load so that the output voltage drops slightly until the CC annunciator
lights.
4 Divide the reading on the rms voltmeter by the load resistance to obtain rms current.
The readings should be within the limit specified below for each output tested.
5 Repeat steps (1) through (4) for the remaining outputs.
Output Specification
+6V 2 mA
+25V 0.5 mA
-25V 0.5 mA
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