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9

INPUT FREQUENCY CALCULATION

The meter determines the input frequency by summing the number of falling

edges received during a sample period of time. The sample period begins on the
first falling edge. At this falling edge, the meter starts accumulating time
towards Low Update and High Update values. Also, the meter starts
accumulating the number of falling edges. When the time reaches the Low
Update Time value, the meter looks for one more falling edge to end the sample
period. If a falling edge occurs (before the High Update Time value is reached),
the Rate display will update to the new value and the next sample period will
start on the same edge. If the High Update Time value is reached (without
receiving a falling edge after reaching Low Update Time), then the sample
period will end but the Rate display will be forced to zero. The High Update
Time value must be greater than the Low Update Time value. Both values must
be greater than 0.0. The input frequency calculated during the sample period, is
then shown as a Rate value determined by the scaling calculation.

The Low Update Time is the minimum amount of time between display

updates for the rate display. Values of 0.1 and 0.2 seconds will update the
display correctly but may cause the display to appear unsteady.

RATE LOW UPDATE TIME 

0.1 

to

99.9 

seconds

The High Update Time is the maximum amount of time before the rate

display is forced to zero. (For more explanation, refer to Rate Value
Calculation.) The High Update Time 

must

be higher than the Low Update Time

and higher than the desired slowest readable speed (one divided by pulses per
second). The factory setting of 2.0, will force the display to zero for speeds
below 0.5 Hz or a pulse every 2 seconds.

RATE HIGH UPDATE TIME 

0.2 

to

99.9 

seconds

"

#

01.0

LO-Udt

"

#

02.0

HI-Udt

SCALING FOR RATE INDICATION

To scale the rate, enter a Scaling Display value with a corresponding Scaling

Input value. These values are internally plotted to a display value of 0 and input
value of 0.0 Hz. A linear relationship is formed between these points to yield a
rate display value that corresponds to the incoming input signal rate. The meter
is capable of showing a rate display value for any linear process.

SCALING CALCULATION

If a display value versus input signal (in pulses per second) is known, then

those values can be entered into Scaling Display (

RAtE dSP

) and Scaling Input

(

RAtE INP

). No further calculations are needed.

If only the number of pulses per ‘single’ unit (i.e. # of pulses per foot) is

known, then it can be entered as the Scaling Input value and the Scaling Display
value will be entered as the following:

NOTES:

1. If # of pulse per unit is less than 10, then multiply both Input and Display

values by 10.

2. If # of pulse per unit is less than 1, then multiply both Input and Display

values by 100.

3. If the Display value is raised or lowered, then Input value must be raised

or lowered by the same proportion (i.e. Display value for per hour is
entered by a third less (1200) then Input value is a third less of # of pulses
per unit). The same is true if the Input value is raised or lowered, then
Display value must be raised or lowered by the same proportion.

4. Both values must be greater than 0.0.

EXAMPLE:

1. With 15.1 pulses per foot, show feet per minute in tenths. Scaling Display

= 60.0 Scaling Input = 15.1.

2. With 0.25 pulses per gallon, show whole gallons per hour. (To have greater

accuracy, multiply both Input and Display values by 10.) Scaling Display
= 36000 Scaling Input = 2.5.

RATE PER

DISPLAY (

RAtE dSP

)

INPUT (

RAtE INP

)

Second

1

# of pulses per unit

Minute

60

# of pulses per unit

Hour

3600

# of pulses per unit

Содержание CUB5B

Страница 1: ...Setpoint capability is field installable with the addition of the single setpoint relay output module or the dual setpoint solid state output module Serial communications capability for RS232 or RS48...

Страница 2: ...ature 35 to 85 C Operating and Storage Humidity 0 to 85 max relative humidity non condensing Vibration According to IEC 68 2 6 Operational 5 to 500 Hz in X Y Z direction for 1 5 hours 5 g s Shock Acco...

Страница 3: ...se widths to 10 msec To access the switches remove the rear cover of the meter as described below A bank of 4 switches is located in the upper right hand corner After setting the switches install any...

Страница 4: ...pplications where cable runs are long and portable two way radios are used in close proximity or if the installation is near a commercial radio transmitter 4 Signal or Control cables within an enclosu...

Страница 5: ...erators Etc Input A Two Wire Proximity Current Source Input A Magnetic Pickup Input A Current Sourcing Output Input A Interfacing With TTL Input A Current Sinking Output Input A Switch or Isolated Tra...

Страница 6: ...move to the next parameter PROGRAMMING MODE EXIT SEL KEY The Programming Mode is exited by pressing the SEL key with Pro NO displayed This will commit any stored parameter changes to memory and return...

Страница 7: ...is value if Reset to Count Load action is selected 9999999 to 99999999 00000500 CmtA Ld COUNTER B BATCH COUNT ENABLE The Counter B batch count function internally counts the number of output activatio...

Страница 8: ...y reset of the selected counter s Change backlight color with each activation backlight version only Inhibit Maintained Reset Freeze display of selected counter s while allowing counts to accumulate i...

Страница 9: ...a pulse every 2 seconds RATE HIGH UPDATE TIME 0 2 to 99 9 seconds 01 0 LO Udt 02 0 HI Udt SCALING FOR RATE INDICATION To scale the rate enter a Scaling Display value with a corresponding Scaling Input...

Страница 10: ...are only active when Counter B is enabled Dual Count mode or batch counter FRONT PANEL COUNTER RESET ENABLE RST The yES selection allows the display to automatically scroll through the enabled displa...

Страница 11: ...Setpoint Action not applicable for Counter B Assignment Select the Setpoint Output to be programmed starting with Setpoint 1 The n in the following parameters reflects the chosen Setpoint number After...

Страница 12: ...vated Reverse rEV turns the output off when activated and on when deactivated NOr SPn OUt SETPOINT ANNUNCIATOR Normal NOr displays the setpoint annunciator when the corresponding output is on Reverse...

Страница 13: ...om the meter in response to a Transmit Value command or a Block Print Request Select NO for a full print transmission consisting of the meter address mnemonics and parameter data Select YES for abbrev...

Страница 14: ...es not issue a reply to value change commands follow with a transmit value command for readback verification Receiving Data From The Meter Data is transmitted from the meter in response to either a tr...

Страница 15: ...o take place The figures list the data formats employed by the meter Start Bit and Data Bits Data transmission always begins with the start bit The start bit signals the receiving device to prepare fo...

Страница 16: ...16 CUB5 PROGRAMMING QUICK OVERVIEW Press and hold SEL key to enter Programming Mode...

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