Controls And Connectors; Operating Procedures - HP 5308A Operating And Service Manual

+ base accuracy +
used to intensity modulate an oscilloscope for display of
the time interval measured. Accuracy is + 1 count + time
trigger error. For more precise mea-
surement of trigger level, connectors are provided on
the rear panel for DVM monitoring of the trigger level
voltage.
9H-3-31. Time Interval Average Mode (Channel A
to B or Channel B Only)
9H-3-32. The time interval average mode provides
greater resolution of time interval measurements than
the time interval mode provides. The + 1 count error
can be reduced by averaging a number of measure-
ments. In the time interval average mode, the main
gate is open for the number of time intervals selected by
the TIME BASE switch. Up to 108 time intervals may
be averaged in this mode. Since the measurement
accuracy is increased by Fiz (instead of = as shown
on the display) the displayed measurement should be
evaluated by computing the true resolution which is
2100 ns where N is equal to the number of time inter-
vals selected by the TIME BASE switch. For detailed
information on time interval averaging, refer to
HP Application Note 162-1.
9H-3-33. Totalize Mode (Single or Two Channel)
H-3-34. Input signals up to 75 MHz applied to Chan-
nel A can be totalized with the TIME BASE switch in
position 1. In all other positions of the TIME BASE
switch input signals up to 5 MHz can be totalized.
The input frequency is scaled by a E equal to the
setting of the TIME BASE switch CLON).
9H-3-35. For single-che anel totalizing, the Channel A
signal is totalized under control of the O/C switch
when the FUNCTION switch is in the TOT A, AA. B
position. Totalizing is initiated by pressing the O/C
switch and terminated by pressing the O/C switch a
second time.
9H-3-36. For two-channel totalizing, the Channel A
signal is totalized under control of the Channel B signal.
When the FUNCTION switch is in the TOT A,
"LIB position (totalize Channel A during pulses on
Channel B) the Start and Stop signals on Channel B
occur between two successive trigger level crossings
in the opposite direction, as follows:
Channel B Slope Switch _/ Channel B Slope Switch A.
Start Stop Start Stop
AR PS
FUNCTION `
TOT A TOT ALR
Model 5308A
Operation
9H-3-37. When the FUNCTION switch is in the TOT A,
AA B position (totalize Channel A between pulses
on Channel B) the Start and Stop signals on Channel B
occur between two successive trigger level crossings
in the same direction as follows:
Channel B Slope Switch _/ Channel B Slope Switch ML
È
Stop
A
Ai
SC
FUNCTION
TOT A,AAB \ \
9H-3-38. Self Check Function
9H-3-39. The CHK position of the SEP-CHK-COM B
switch on the front panel provides a position where
proper operation of the majority of the logic circuits
in the 5308A and 5300B is verified. When circuits are
functioning properly, the 10N counts are displayed
for positions 10 through 10% of the TIME BASE switch
with the proper decimal position and annunciator.
9H-3-40. Stopwatch Function
9H-3-41. The CHK position of the SEP-CHK-COM B
switch also provides an electronic stopwatch function
when the FUNCTION switch is setto TOTA, AA B.
After the RESET switch is pressed, the stopwatch
count is started by pressing the O/C switch. The count
is terminated by pressing the O/C switch a second time.
To initiate a new measurement, the RESET switch
must be pressed.
9H-3-42. CONTROLS AND CONNECTORS
9H-3-43. The front panel controls and connectors are
described in Figure 9H-3-2 and the rear panel switch
and connectors are described in Figure 9H-3-3.
9H-3-44, OPERATING PROCEDURES
9H-3-45, The operating procedures for making mea-
surements in the various modes are listed in Figures
9H-3-4 through 9H-3-12.
9H-3-3