DATA PRECISION 5740 - Measuring Period

72-1002 Model 5740 COUNTER
e) Set TRIGGER LEVEL for stable values
on display. (Start with knob indicator at
zero, or midposition.)
f) Observe OVERFLOW indicator. If ON,
operate rotary switch to select lower val
ue gate time of O.lsec. If OVERFLOW re
mains ON when gate time is O.IS, then in
put signal is above lOOMHz specification
limit.
If OVERFLOW is OFF, and if greater
resolution is desired, operate rotary
switch to increase gate time to lOS posi
tion. In this position, measurement will
be repeated in 10.3 seconds, and least
significant digit will indicate O.lHz in
crements .
g) Read display directly in kilohertz
when value is stable. Table 2-2 summa
rizes the operation of the Model 57U0 for
different control settings in measuring
two frequency input signals.
2.4 MEASURE PERIOD
2.4.1 General
In PERIOD Mode, the Model 57it0 counts
time increments for a number of pulses
determined by the axis crossings of the
input signal and as selected by the op
eration of the front panel rotary switch.
The decimal point is automatically po
sitioned so that the displayed period or
average period value may be read direct
ly in microseconds.
2.4.2 Step-by-Step Procedure
a) Operate the MODE slide switch to
PERIOD-EVENTS.
b) Operate rotary switch to 100 (100
periods to be averaged.)
Table 2-2
MODEL 5740 FREOUENCY MEASUREMENT PARAMETERS
Input
GATE TIME Settling
Display
Display*
Frequency Time Gate is open
Resolution
Overflow
MHz
(LSD)
10 sec
.IHz ON
231+. 5678
1 sec
IHz OFF
1231+. 567
1.231+5678
. 1 sec
lOHz OFF
01231+. 56
.01 sec
lOOHz OFF
001234.5
10 sec
. IHz
ON
999.9900
99.999990
1 sec
IHz
ON
9999.990
100 msec
lOHz
OFF
99999.99
10 msec
lOOHz OFF
099999.9
*For greatest resolution, use Time Base setting for minimum number of
leading zero's without OVERFLOW.
2-4
COPYRIGHT 1975 DATA PRECISION CORPORATION PRINTED IN THE U5.A.