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TIME BASE SELECTION
The SUB-CUB-R has a time base selection range of approx. 3.9 msec to 15.9
seconds in 3.906 msec (1/256 second) increments. The minimum time base
setting is obtained by pulling only the TB1 input low while the maximum time
base is obtained by pulling all TB inputs low. Therefore, a specific time base
is achieved by adding the appropriate individual time base increments. The
time base increment total is computed according to the following formula:
DECIMAL POINT SELECTION
The selection of the Decimal Point is accomplished by the DPA and DPB
inputs. The table below shows the logic states which should be used to obtain
the desired decimal point location. The SUB-CUB-R has leading zero
blanking. Note that a change in decimal point position will only occur at the
end of the present time base period.
WHERE:
DR =
DDP =
TIME BASE INCREMENT
TOTAL (TBIT)
Desired Reading
Display Decimal Point
=
DR x DDP x 15,360
RPM x PPR
DPB
Low
Low
High/Open
High/Open
DPA
Low
High/Open
Low
High/Open
D.P. LOCATION
Factory Test Mode Only
0
0.0
0.00
RPM
PPR
DDP:
=
=
Revolutions Per Minute
Pulses Per Revolution
PULSED PULL-UP LATCHED INPUTS
0
0.0
0.00
=
=
=
1
10
100
The Display Decimal Point (DDP) value is
determined by the desired decimal point
placement in the readout.
The Time base inputs, the Decimal Point inputs, and the Frequency
Doubling inputs are designed to be actuated by wired or switched
connection to Common or by switching an open collector of a transistor to
TIME BASE
INPUT
TB1
TB2
TB3
TB4
TB5
TB6
TIME BASE
INCREMENT
1
2
4
8
16
32
TIME BASE
INPUT
TB7
TB8
TB9
TB10
TB11
TB12
TIME BASE
INCREMENT
64
128
256
512
1024
2048
Common. A pull-up resistance is provided for all of these inputs. To keep
current consumption to a minimum, this input circuit has been designed to
latch the present state of the inputs, allowing the pull-up resistance to be
switched on and off, thus reducing current consumption. The following is
a description of the sequence of events for these inputs (Refer to the
drawing below):
At the end of a previous time base, a 30.5 μsec pulse is generated within
the time base chip which will cause Q1 to switch ON the input’s pull-up
EXAMPLE: Find the appropriate Time Base input settings for a desired
display reading with a fixed shaft speed.
DESIRED READING (DR) = 250.0
REVOLUTIONS PER MINUTE (RPM) = 1250
PULSES PER REVOLUTION (PPR) = 50
resistance. During this time, if the input is being held low, the input will
provide a sourcing current pulse thru Q1. The level of the input (either low
or high) is sensed by the input’s Latching Circuit. When the pulse is
terminated, the Latching Circuit will hold the input at its present state.
If an input, which is presently in the high state, is pulled low, the
Latching Circuit will respond immediately and latch the input in the low
state. If an input is presently held in the low state, and is allowed to float,
TBIT =
250.0 x 10 x 15,360
1250 x 50
=
38,400,00
62,500
= 614.4
the Latching Circuit cannot respond until the end of the time base; at which
time, the Pulsed Pull-up resistance will pull the input high. The Latching
TBIT = 614 (round off to the nearest whole number)
Circuit will then latch the high state. A Master Reset (MR) will terminate
the present time base and allow new TB inputs to be latched.
TIME BASE INPUT
REMAINDER NEEDED
TB10 (512)
TB7 (64)
TB6 (32)
TB3 (4)
TB2 (2)
.........
.........
.........
.........
.........
614 - 512 = 102
102 - 64 = 38
38 - 32 = 6
6-4=2
2-2=0
As shown above, Time base inputs TB10, TB7, TB6, TB3, TB2 are pulled
low to generate the desired time base. The actual time base in seconds is
calculated by dividing the TBIT Total by 256.
614/256 = 2.398 sec.
FREQUENCY DOUBLING
FD is the Frequency Doubling input. When it is in the high state or left open,
twice the number of input pulses are registered on the readout. This doubling
of the signal input rate allows the Time Base Increment Total (TBIT) to be
halved, thus allowing for a faster update time for a given display value. If this
input is in the low state, Frequency Doubling is disabled.
3
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相关PDF资料
HWK70000
CABLE ASSEM FOR MDM SERIES
IF-30-56
XFRMR 115/230V 28V 1.1A 30VA PCB
IL-20-0001
IL5 PULSE TRANSFORMER THT 0.25A
ILR-11-0003
ILR3 IMPULSTRAFO KONVENTIONELL
IS-1000
TRANSFORMER ISOLATION 1000W
IS-250
TRANSFORMER ISOLATION 250W
IS-500
TRANSFORMER ISOLATION 500W
IS1000HG
TRANSF ISO 1000W 4OUT HOSP GRADE
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