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Noise
This procedure is used to check the noise performance of the HP E1563A or HP
E1564A Digitizer. The digitizer's internal short is applied to the H (HI) and L (LO)
Verification
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 chapter.
2. Execute the command
H and L terminals of channel 1.
3. Set a sample interval of 25
4. Select the first range (62 mV) shown in Table D-3.
Table D-3. Noise Verification Test Points.
INPUT
internal
H-L short
DIAG:SHORt
command
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
σ
=
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.
to enable the internal short across the
DIAG:SHOR1 ON
µS by executing SAMP:TIM 25e-6.
HP E1563A /
HP E1564A
Range
62 mV
0.25 V
366 µV max
1 V
4 V
16 V
64 V
256 V
" represents the 100 readings where n = 1 to 100.
n
Σ reading
(
)
(
2
–
100 mean
n
-----------------------------------------------------------------------
99
HP E1563A and E1564A Verification Tests
Error from
zero
23 µV max
92 µV max
1.5 mV
5.9 mV
23.4 mV
93.8 mV
)
2
149
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