Digital Analog Tech Note 11 - TNDA11

Products

Ditak6, Ditak7, Ditak8, Ditak9, APLR

DITAK6, DITAK7, DITAK8, and APLR

Step 1: Determine Timebase Increment Total (TBIT)

  Desired Reading (DR) X Desired Display Point (DDP) X Product Constant*  
Corresponding Revolutions per Minute (RPM) X Pulses per Rev (PPR)

DR: Desired reading at a specific RPM. (If displaying RPM then remove DRV and RPM from equation.)
DDP: 0 (whole #) = 1, 0.0 (tenths of unit) = 10, 0.00 (hundreds of unit) = 100 (Ditak 8 does not have DDS)
*Product Constant: DITAK6 & DITAK7 = 15,360, DITAK8 = 15,361, APLR0 = 15,000
RPM: The corresponding RPM for the DR
PPR: Pulse per one revolution or one unit of measure

Step 2: Enter Timebase Increment Total (TBIT)

Set to the "ON" position the Time Base DIP switches which together adds to the above TBIT.

Step 3: Review The Display Update Time

The display update time in seconds = TBIT x 0.004
To improve the update time:
1. Enable frequency doubling and lower the TBIT and display update value by half.
2. Lower DDS by one position and lower the TBIT and display update value by a factor of 10.

GENERAL RULE

2 pulses per rev = 30 second update
20 pulses per rev = 3 second update
200 pulses per rev = .3 second update

DITAK9 Using Known RPM

Step 1: Calculate Time Base

  Desired Reading (DR) X Desired Display Point (DDP)  
Hertz (HZ)

Step 2: Round Time Base (RTB)

Round the Calculated Time Base to nearest number between 1-7

Step 3: Calculate the Remainder Multiplier (RM)

  Desired Reading (DR) X Desired Display Point (DDP)  
Rounded Time Base (RTB) X Hertz (HZ)

DR: Desired Reading at the specified RPM
Hertz (HZ):   RPMs X Pulses per Revolution  
                                       60
DDP: 0 (whole unit) = 1, 0.0 (tenths of unit) = 10, 0.00 (hundreds of unit) = 100

If RM is greater than 1.9999, then remove a decimal location or add more pulses per revolution.

DITAK9 Using Known Pulses per Unit

Step 1: Calculated Time Base

  Time Factor (TF) X Desired Display Point (DDP)  
Pulses Per Unit (PPU)

Step 2: Round Time Base (RTB)

Round the Calculated Time Base to nearest number between 1-7.

Step 3: Remainder Multiplier (RM)

   Time Factor (TF) X Desired Display Point (DDP)   
Rounded Time Base (RTB) X Pulses Per Unit (PPU)

Time Factor: Second = 1, Minute = 60, Hour = 3600
DDP: 0 (whole unit) = 1, 0.0 (tenths of unit) = 10, 0.00 (hundreds of unit) = 100

RM is greater than 1.9999, then remove a decimal location or add more pulses per revolution.

Disclaimer

It is the customer's responsibility to review the advice provided herein and its applicability to the system. Red Lion makes no representation about specific knowledge of the customer's system or the specific performance of the system. Red Lion is not responsible for any damage to equipment or connected systems. The use of this document is at your own risk. Red Lion standard product warranty applies.

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