DATA PRECISION 5740 - Totalizing Events

72-1002
Model 5740 COUNTER
Table 2-3
MODEL 5740 PERIOD MEASUREMENT PARAMETERS
Input Period No. of Input
Resolution Overflow
Micro-
Cycles Gate Was
(LSD) Light
Display*
Seconds
Open
»
123456.GO
1
1 us
OFF
G123456
IG
. 1 us OFF 123456.G
^8.IHz
IGG .01 us
ON
23456.00
IGGG
.GGl us
ON
3456.GOG
^Select resolution position for non-overflow reading with minimum
leading zero's.
c) Connect input to BNC connector.
d) Operate ATTEN to appropriate posi
tion for expected magnitude of input
signal. (For inputs less than 40V,
ATTEN = XI.)
e) Set TRIGGER LEVEL for stable val
ues on display. (Start with knob indi
cator at zero, or midposition.)
f) Observe OVERFLOW indicator. If ON,
operate rotary switch to select lesser
number, 10, of periods to be averaged;
if OVERFLOW is still ON, rotate switch
to select least number, 1, of periods to
be averaged. If still in OVERFLOW,
Period is greater than 9 , 999,999usec (or
10 sec), and if sine wave, then input is
not within specified value.
g) Read display directly in micro
seconds, when displayed value is stable.
Table 2-3 summarizes the operation of
Model 5740 for different control set
tings when measuring an input period
corresponding to approximately 8Hz.
2.5 TOTALIZING EVENTS
2.5.1 General
In the EVENTS mode of operation, the
Model 5740 counts axis crossings of the
input signal over a time interval deter
mined by the manual operation of the
front panel rotary control knob (or by
electrical control signals when the BCD
option is installed).
2.5.2 Step-by-Step Procedure
a) Operate MODE switch to PERIOD-
EVENTS position
b) Operate Rotary switch to RESET
position
c) Connect input to BNC front-panel
connector
d) Operate ATTEN switch to appropriate
position for expected input amplitude.
(For inputs greater than 40 volts, op
erate ATTEN to X2G.)
e) Operate Rotary switch to SEC-EVENTS
position. The GATE light comes ON and
remains ON while counting events.
f) Observe counted value as displayed.
If the displayed values appear to be
much more erratic than expected, then
operate TRIGGER LEVEL control to stabi
lize the counting.
g) To stop the counting, operate the
Rotary switch to the HOLD position.
h) To continue the counting from the
previously held value, operate the Rota
ry switch to the SEC-EVENTS position.
i) To start a new events totalizing
cycle begin with Step b) above.
COPYRIGHT 1975 DATA PRECISION CORPORATION. PRINTED IN THE U.S.A.
26