KEPCO KIT 219-0532, ABC Ripple/Noise Measurement - Manual (Page 2)

2
228-1642 082407
KEPCO, INC. " 131-38 SANFORD AVENUE " FLUSHING, NY. 11355 U.S.A. " TEL (718) 461-7000 " FAX (718) 767-1102
http://www.kepcopower.com " email: [email protected]
3. MEASUREMENT GUIDELINES
1. The ABC Unit Under Test (UUT) must be fully calibrated and have passed all other performance tests as
detailed in the applicable ABC Service Manual.
2. Follow the steps for Noise Measurement contained in the ABC Service Manual except as noted below
a. All connections must be made at the rear panel.
b. Use oscilloscope and probe listed in Table 1. Set oscilloscope bandwidth to 60MHz.
c. When making source and switching frequency ripple measurements, connect the Ripple Measurement
Cable, Kepco Model No. 25422, directly between the oscilloscope and the UUT.
d. When making spike noise measurements, first install Kepco Scope Probe Adapter Model No. 25423
directly to the rear terminals of the UUT, then connect the scope probe to the probe jack on the adapter
having first removed the probe end cap and ground lead (see Figure 6-3 of the ABC Service Manual).
3. Make separate measurements for low frequency (2 x source frequency) ripple, switching frequency ripple and
noise (commutation spikes).
a. Table 2 lists the maximum specified value for A: 2 X Source Frequency Ripple, B: Switching Frequency
Ripple, and C: Spike Noise.
b. Table 2 also lists a corresponding model-specific illustration with oscillosgraphs of the three measurements
that show how the measured values appear on the oscilloscope.
c. Each illustration is accompanied by specific horizontal and vertical settings for the oscilloscope.
TABLE 2. RIPPLE AND NOISE SPECIFICATIONS
Model Measurement
Figure
Maximum Specification Values
2× Source frequency
(See Detail A of
Measurement Figure
Switching frequency
See Detail B of
Measurement Figure
Spike (50MHz)
See Detail C of
Measurement Figure
ABC 10-10 DM See Figure 1. 4 mVp-p max 5 mVp-p max 20 mVp-p max
ABC 15-7 DM See Figure 2. 7 mVp-p max 8 mVp-p max 20 mVp-p max
ABC 25-4 DM See Figure 3. 10 mVp-p max 10 mVp-p max 20 mVp-p max
ABC 36-3 DM See Figure 4. 15 mVp-p max 15 mVp-p max 20 mVp-p max
ABC 60-2DM See Figure 5. 24 mVp-p max 24 mVp-p max 24 mVp-p max
ABC 125-1 DM See Figure 6. 50 mVp-p max 50 mVp-p max 50 mVp-p