14
Common Jumper Settings
Input Type
Vmax
A0 & B0 A1 & B1 A2 & B2 A3 & B3 A4 & B4
Logic levels
250V
-
-
-
a
b
NPN open collector
NA
b
a
-
a
b
PNP open collector
NA
b
b
-
b
b
Contact closures
NA
a or b
a
-
a
a, c
Line frequency
250V
b
-
-
-
a, c
Turbine flow meter
250V
b
-
a
-
b
OVERVIEW OF OPERATING MODES
RATE & FREQUENCY MODES
Frequency in Hz
is determined by timing an integral number of pulses over a user-specified
gate time
from 0 to 199.99 sec and taking the inverse of average period. The typical display
update rate of the meter is gate time + 1 period + 30 ms Selecting a longer gate time
produces a more stable reading as more cycles are averaged, but slows down the update
rate. At very low frequencies, the update rate is controlled by the period. A
time-out
from 0
to 199.99 sec is also selectable. This is the time the meter waits for a signal to start or end a
conversion. If the signal is not received before the
time-out
ends, the meter reads zero. The
longer the time-out, the lower the minimum frequency the meter can display.
With a
scale factor
of 1 and
multiplier
of 1, frequency is displayed in Hz with no decimal
point. Appling a multiplier from 1 to 100000 (in decade steps) and setting the decimal point
increases resolution (0.1 to 0.00001 Hz). Decreasing the multiplier from 1 to 0.00001 (in
decade steps) and setting the decimal point allows display in kHz or MHz. Note that the
same 100 kHz frequency can be displayed as 100000 Hz or 100.000 kHz simply by moving
the decimal point.
DISPLAY FREQUENCY IN Hz WITH 1 Hz RESOLUTION
Application:
Display frequency from 1 Hz
to 999999 Hz with no decimal, display up-
date rate of 4/sec, and adaptive moving
average filter for 6 readings.
Solution:
Set Input to “Rate A Only.” Set
Config to display to 999999 counts. Set
Gate Time to .22 sec so that the display
update rate becomes .22 sec +30 ms +1
period. Set Time-out to 1 sec, so that fre-
quencies under 1 Hz are displayed as 0.
Set filter for adaptive moving average with
a 1.6 sec time constant. Apply a scale
value of 1.00000 and multiplier of 1 for
direct readout in Hz.
Summary of Contents for 800 plus
Page 63: ...63 SERIAL CONNECTION EXAMPLES ...