User Manual – Rev AJ
California Instruments
2.7.3 Output Noise Spectrum
The MX series is a switching power supply and as such will have a certain amount of switching
noise at its output. While the overall RMS noise is specified, the specific noise spectrum will
differ slightly from unit to unit. The information provided in this section is for reference only.
The output noise can be reduced by using one or more external filters. A suitable filter is the P/N
7003-424-1 (Figure 2-12) available from California Instruments as an option. Attenuation at the
250 kHz ripple frequency is 20 dBuV. The output voltage drop at 800 Hz full load is less than
1Vrms.
Typical output noise spectrum for a standard MX45-3Pi in three phase mode operating at 400
Hz is shown in Figure 2-13 for phase A and Neutral. The same output with the use of the
optional filter is shown in Figure 2-14. For connection information, refer to section 3.14.
MX Filter Specifications
(Model 7003-424-1)
Type
Low Pass Filter
Three phase WYE, four wire. (A, B, C and Neutral)
Capability
Frequency range
DC, 16 Hz - 800 Hz
Max Voltage
250 Vrms Line to Neutral / 440 Vrms L-L
Phase Current
125 Arms per phase maximum.
Impedance
Voltage drop at 800 Hz, 125 A is less than 1 Vrms.
Performance
Attenuation
20 dBuV at 250 KHz.
Physical
Enclosures type
Cooper B-Line P/N 16126 SC NK
Dimensions (W x D x H)
Unit:
16” x 12” x 6” / 406 mm x 305 mm x 152 mm
Shipping:
30” x 25” x 11” / 760 mm x 635 mm x 280 mm
Weight
Net:
28 lbs / 12.7 Kg
Shipping:
40 lbs / 18.2 Kg
Operating Temp:
0° to +40
°
C. / +32° to +104° F.
32 MX
Series