VXi Computer Hardware VX1410A User Manual
Performance Verification
5–2
VX1410A & VX1420A IntelliFrame Mainframe Instruction Manual
DC Load Ripple and Noise
Use an oscilloscope to check the DC Load Ripple and Noise on the pins of the
25-pin connector and compare the results against the limits listed in Table 5–1.
25-pin connector and compare the results against the limits listed in Table 5–1.
1. Set up the oscilloscope as follows:
Bandwidth Limit
20 MHz
Input Coupling
AC
Volts/Division
10 mV/div
Time Base
1 s/div
Trigger Mode
Auto
Acquisition Mode
Peak Detect
2. Connect a ground lead (less than one inch) to the 1X oscilloscope probe
(P6101B).
3. Connect the probe to Pin 1 of the 25-pin connector and connect the ground
lead to one of the ground pins listed in Table 5–1.
4. Check that peak-to-peak voltage displayed on the oscilloscope is less than
the limits listed in Table 5–1.
5. Check the remaining voltages in Table 5–1.
Table 5–1: DC load ripple and noise check
Pin
Supply
Limits (V
p-p
)
1
+5 V
50 mV
2
–12 V
50 mV
3
–24 V
150 mV
4
–2 V
50 mV
14
+12 V
50 mV
15
+ 24 V
150 mV
16
–5.2 V
50 mV
9, 17, 8,19, 20, 22, 24
Ground