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Digitizers Verification Tests 155Appendix D
Noise Verification
Test
This procedure is used to check the noise performance of the E1563A or
E1564A Digitizer. The digitizer’s internal short is applied to the H (HI) and
L (LO) input terminals of the channel being tested using the DIAG:SHORt
<channel> ON command.
1 Check the "Test Conditions" section at the beginning of this appendix.
2 Execute DIAG:SHOR1 ON to enable the internal short across the H
and L terminals of channel 1.
3 Set a sample interval of 25
msec by executing SAMP:TIM 25e-6.
4 Select the first range (62 mV) shown in Table D-3.
5 Make 100 readings, sum them, divide by 100 and obtain the mean
reading.
6 Calculate the standard deviation using the following formula (this is
the rms noise value). "reading
n
" represents the 100 readings where
n = 1 to 100.
7 Record the rms noise value on the Performance Test Record and
compare the result to the appropriate test limit shown in the test
record or the above table.
8 Repeat steps 4, 5 and 6 for each range listed in Table D-3.
9 Repeat steps 3 to 7 for channel 2 on the E1563A 2-Channel Digitizer
and channels 2 through 4 on the E1564A 4-Channel Digitizer
changing the channel number in the DIAG:SHORt<channel> ON
command and executing the command prior to performing the steps.
Table D-3. Noise Verification Test Points.
INPUT E1563A /
E1564A Range
Error from zero
internal
H-L short
DIAG:SHORt
command
62 mV 57 mV
0.25 V 180 mV
1 V 720 mV
4 V 2.88 mV
16 V 14.7 mV
64 V 48 mV
256 V 189 mV
I
5 reading
n
2
100 mean
2
–
99
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