6
(continued)
Q. Can I use the Dart PU-E pick-up located more than 6 feet from the display?
A. The PU-E pick-up operates at a 5 Volt level, producing a 5 volt Square Wave. If noise is present on the line to or from the
pick-up, some information may be lost and the DM4000 Series may not be able to distinguish between the noise and the
relatively small 5 Volt square wave. For this reason, we would recommend that in a “normal” environment the PU-E pick-
up not be located more than six (6) feet from the display. In a particularly noisy environment, six feet may exceed the cord
length necessary for an error free signal from the PU-E pick-up. If it is absolutely necessary to exceed six feet, or in a par-
ticularly noisy application, shielded cable should be used, connecting the shield to the COMMON terminal on the wire end
of the PU-E housing. In such cases, the PU-E pick-up cord should not be grouped with any other wires or cords in the
shielded cable.
Q.
Can the decimal point be easily changed?
A. Yes, all decimal points are illuminated and have been masked with a black sticker to make them invisible. Remove the front
lens and remove the appropriate sticker.
Q.
How many displays can one PU-E pick-up operate at once?
A. We recommend no more than nine.
Q.
Can the DM4000 Series be switched between inputs?
A. Yes. On the PU-E pick-up, switch the “SIG” wire and leave the “COM” and “+V” connected to each pick-up (do not exceed
nine PU-E pick-ups per DM unit).
Q.
Can I tie the DM4000 Series to a computer?
A. No, there are no computer outputs available from the DM4000 Series.
Q.
What is the update time?
A. This varies with the programming of the “S” value setting, which ranges from .0167 through 4.25 seconds. The DM4004
update time = .0167 x “S” (in seconds). See SPECIFICATIONS section shown below.
Q.
How can I program “MS” in order to display RPM using a DM4004 and a PU-2E?
A. Activate switches 3 and 6 in the DM4004 [M(100) x S(36) = 3600].
SPECIFICATIONS
INPUT VOLTAGE .............................................................. 120VAC ±10% (optional 240VAC input); 50/60 Hertz
AC CURRENT - MAXIMUM ........................................................................................................................ 225 mA
DECIMAL POINT .................................................... Illuminated, covered with adhesive dots (field removable)
DISPLAY .............................................................................................................................. 1/2" red L.E.D. 4 digit
DISPLAY ACCURACY ............................................................................................................................. ± 1 count
DISPLAY RANGE ................................................................................................................................. 125 to 9999
INPUT PULSE RATE ......................................................................... Minimum required: 125 pulses per minute
.....................................................................................................
Maximum allowed: 600,000 pulses per minute
MINIMUM SINE WAVE ....................................................................................................................... 175 mV RMS
(that can be recognized as a signal when used with Proximity Pick-ups)
MOUNTING .............................................................................................. Panel mounted (screws not provided)
TEMPERATURE ...................................................................................................... -10
o
to +45
o
C. (15
o
to 115
o
F.)
TIME BASE .............................................................................................................................. A.C. line frequency
TRANSDUCER POWER SUPPLY VOLTAGE .......................................................... +5 VDC, 75 mA. maximum
TRANSDUCER TYPES (capable of sinking 3mA) .............. Hall-Effect, Photo-Electric, Magnetic (Proximity),
.........................................................................................
TTL, or any +5 to +24VDC NPN open collector device
UPDATE TIME ..................................................................................................... Range .0167 thru 4.25 seconds
Varies with programming of “S” value setting (DM update time = .0167 x S (in seconds))
