Omega Engineering DP3300 Series - Manual (Page 8)

DP3300 Series User’s Manual
Page7
below the limit (minus the relay) deadband. The second mode is manual reset. Once the limits are energized, they will stay
energized until manually reset.
(NOTE: In the RPM mode, the rate time base must be smaller than the selected filter value. If not, the system will
automatically consider the filter value as the time base for rate calculation. Also, a difference of 0.500 is recommended
between the filter and time base).
FREQUENCY MONITOR:
DP3300 monitor can also be programmed as a frequency monitor. In this mode the unit will display incoming frequency with a
crystal based reference. Input signal is used for gating one time period. An internal counter counts the clocks from a crystal based
oscillator and uses that to determine the frequency of incoming signal. Frequency range is from 5.00HZ to 1,000,000 HZ.
There are two frequency modes in which the system operates. Low frequency and high frequency. These modes are selected
during SETUP. In low frequency mode, the unit will show frequency in 100th of a hertz and the range is from 2.00 HZ to 500.00
HZ. In high frequency mode, the system displays the frequency in unit steps. The range is from 1 HZ to 1,000,000HZ.
During frequency mode, indicated rate is same as the frequency. Total and batch count is not updated during this mode. High and
low peaks are captured and can be displayed by pushing the HI/LO key.
Three Frequency based limits (two with outputs, 1 audio/visual) per channel are provided which activate when preset limit is
exceeded. The status of these limits is indicated on the front panel by LEDs.
There are two modes of resetting the limits. First is the automatic mode in which the limits reset automatically as soon as the
frequency falls below the limit minus the relay deadband. The second mode is manual reset. Once the relays are energized, they
will stay energized until manually reset.
NOTE: Channel 2 can be programmed for low frequency mode, only if Channel 1 input is not configured for pulse. If
Channel one is configured for pulse input, Channel 2 does not allow low frequency configuration during setup and the low
frequency step is automatically skipped. Also, if Channel 2 is configured for low frequency (e.g. with Channel 1 being
setup as Analog Channel) and Channel 1 is switched from Analog to Pulse input, channel 2 will be automatically switched
from low frequency to high frequency mode. Under this condition, limits must be reconfigured for proper value with no
decimal point on channel 2.
COUNTER
In counter mode, the system can be programmed to either count up or count down in six different modes. The limit relays can be
programmed to reset manually or automatically. Also, the delay time on automatic reset of the relays is programmable.
For scaling, the unit provides the convenience of a scaler and a division factor. The scaler can be programmed from 0.00000 to
99.99999, in increments of 0.00001. Scaler is a number with which the input count is multiplied. For Example a flow meter that
puts out one pulse for every 0.00024 gallons, would require a scaler of 0.00024. On a pulse count of 10000, the display will read
2.4 (10000 x 0.00024 = 2.4). Scaler is disabled if its value is set to 0.00000. Similarly, the division factor works on incoming
pulses and divides them with the programmed factor.
NOTE: Division factor is disabled if a scaler value greater then 0.00000 is programmed.
Various operating modes of the counter are explained below: