HP 3314A - Page 42

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Model 3314A
3314
Performance Tests
UNIVERSAL
COUNTER
11f-------
~D:I==============o ~ ~A ~ JI
J:I 50 OHM
/ FEEDTHRU
/ TERMINA TION
/
/
/
\ OUT /
"'- ..r/
L [~ LII
1[0 C]EJ
[L L L LI
to. .... .... "" ("
LLLLLL
"
It L L LI
t.. "" .... t.. "" "
LLLLLL
I" " ,," II """"If """
@) L L L e @) L e ~"L
Figure 4·1. Frequency Accuracy Test
4-3. TIME AXIS AND VARIABLE SYMMETRY
C. Set the Counter as follows:
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This is a test to check the Symmetry function of the
3314A.
Specification:
070Symmetry I Specification
50070 50070 ± 0.2% of period
5070 5070 ± 0.5070 of period
95070 95070 ± 0.5070 of period
Equipment Required:
Universal Counter
50 Ohm Feedthrough Termination
Procedures:
Function , .
, . , , . , , , Per Avg A
Resolution. , , , . , , , , , .. O.lkHz
Attenuation
., ,., '" , .. , xl0
Channel A Slope .. , . , . , , . , . . . . . .. +
Channel B Slope , , .. , ,
Coupling .... , .. _. , . , , , __ , ... , , DC
(Both Channels)
Channel
Input . . .. . . . .. . ., Com
D. Connect the 3314A to the Counter as shown in
Figure 4-2.
E. Record the period
of the 3314A Square Wave
signal (t) displayed on the Counter.
F. Change the Counter function to
"TI Avg A-B".
A. Preset the 3314A.
G. Record reading (t
1
).
B. Set the 3314A as follows:
H. Calculate the percent of symmetry using the
following equation and record in the test record:
Function
'., .. , , .. , , _, ,. Square
Frequency
, ,. _. _ ,. 100kHz
Amplitude .
__ _. . _ .. lOVp-p
Symmetry . .
,.. . ..... ,.. ... . . .. 50%
%Symmetry = (t
1/t)100070
I. Adjust the symmetry on the 3314A to 5%. set the
Counter function back to Period Avg A, and repeat
steps E through H.
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J. Adjust the symmetry on the 3314A to 95070, set the
Counter function back to Period Avg A, and repeat
steps E through H.
4-3