DM .. 4200 4V2 Digit
Differential IL.ED DPM
with Data Outputs
PRODUCT DATA AND
USER'S GUIDE
FEATURES
• Low Cost 4 11, Digit DPM with LED Display
• Balanced Differential Inputs
• Digit Serial BCD Outputs - Can Drive Remote Slave
Display (DM-4102)
• High Brightness .3" High LED Display
• 1000 Megohm CMOS Input with 5 pA Bias Currents
• Autozeroing with Ratiometric Reference for Drill
Correction
• + 5 Vdc Power - provides - 5 Vdc at 15 mA Outputto
Power User Circuits
• Low Profile Polycarbonate Case -2.53'W x 3.34"0
x 0.94"H
APPLICATIONS
• Ammeter - Accepts user-supplied shunts for :!: 20 µA
to ± 2A Full Scale Ranges
• Voltmeter - Accepts user·supplied attenuators for
:!: 2V to :!: 1 kV Full Scale Ranges
GENERAL DESCRIPTION
The DM·4200 is a4 Vz digit DPM (Digital Panel Meter) with differential
zeroed to minimizezerodrift. The reference voltage is.brought out on
a rear panel pin (Reference Out), where it can correct drift in external
ratiometrlc bridge circuits.
inputs and an LED display. The meter accepts analog de input volt
ages from -1.9999V to+ 1.9999V.
A dual slope AID converter changes these inputs to a BCD digital
code. Decoder drivers cause the input voltage to be displayed on .3 n
high LED numerals. The BCD-encoded numerals (digit serial) are
also output to a rear-panel connector where they may be used to
drive a slave display, or become AID inputs to a printer or micro
computer.
Circuit pads on the DM·4200's converter board will accept current
shunts and voltage dividers to extend the input range to ± 1 kV full
scale on voltage, and ± 20 µA to ± 2A full scale on current measure·
ments. BCD outputs, multiplexed by digit, are available. The outputs
are 1 TTL load, and can be used to drive a remote display.
Overscale and Underscale outputs can be used with external cir·
cults to autorange the meter. A Run/Hold output can be tied low to
stop the meter's AID conversions, and to continuously display the
last reading. A Busy/Done output goes low to indicate the end of an
AID conversion.
The DM-4200 is housed In a compact, low profile polycarbonate case
only .94" high. The DM-4200 can be used in process control panels,
OEM products, and medical instrumentation to provide a clear, un
ambiguous display of d.c. voltages.
CMOS input circuitry gives the DM-4200 very high input impedance
(1000 Mn typical, 100 Mn minimum), and a very low Input bias current
(5 pA typical, 50 pA maximum). The meter's input amplifier Is auto-
A built-in de to de converter provides -5V Out (at 15 mA max.) to
powerusercircults. Power input is + 5 Vdc (± .25V) regulated at 200
mA typical and 250 mA max.
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MECHANICAL
DIMENSIONS
INCHES
(MM)
SINGLE MOU�JTING CUT ()UT
USER'S
FRONT PANEL
/
REMOVABLE
PANEL MOUNTING
/ HARDWARE ,,�
'
PANEL THlCKt<ESS
.062 TO 0.625.
11 61 TO 1!!;, 9.1
1 of 6
Di\11-4200
DATA OUTPUT TIMING DIAGRAI\II
To reduce the amount of wiring required to implement a slave dis·
play, 4-wire BCD data is multiplexed using 5 digit drive outputs
which direct the BCD data to the proper digit. The DPM displays
rely on the persistence of vision of the human eye to store an im
age of the displayed digit. This mult iplexing technique Is com
monly used with DPM's and DVM's. Each digit drive has the effect
of sequentially turning on its respective diglt when the drive signal
is HI. The digit ls blanked when the drive is low.
DATA OUTPUT TIMING DIAGRAM
(FROM DM-4101 L, 4200, 4105 DPM'S TO RESPECTIVE SLAVE DISPLAYS)
I
""
I
1,
CONVERSION
=il�---fc
:
'-�---'--------'
I
I
APPAOX
.. 1 Jms:I
DIG. 5 DRIVE
(MSD)
•
APPROX. 1.3,;.,S -----...j
•
I
I
OIG.4 DRIVE
Digits are scanned in this manner in the DM·4101L, 4200, 4105 ap
proximately 150 times per second. The BCD data is updated with
every AID conversion which is approximately 3 times per second.
Only 5 strobe pulses are Issued with each new conversion. These
DPM's may be connected to popular microprocessors by using pe·
ripheral interface circuits and a su itable data transfer program.
The strobe may be used to generate an interrupt which latches the
DPM's output data, then transfers it to memory.
•
I
1
APPROX 6.7m�
I
1
1--
DIG.J DRIVE
DIG. 2 DRIVE
DIG l DRIVf:
(LSD!
BUSY
.
STROBE OUT
fPPROX
I
UNOERSCALE
BCD
DATA
(4 LINES!
------5 STROBES ONLY PER CONVERSION
=Zx.,_,_,x""'xx =x,,_,_>:1_�1J
OVERSCALE
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00l
:
:
OUTPUTS ARE 1 ITL LOADS MAX.
STROBE MAY BE USED TO INDICATE
VALID BCD DATA.
1�-I
llMING !S lYPICAL ANO IS NOT TOSCAtf
OVERSCALE/UNDERSCALE AUTORANGING
CONTROLS
Murata's new 411.! digit differential DPM's include Underscale and
Overscale outputs. Overscale trips when the input exceeds 19999
counts. Underscale trips on 1800 counts. If an external circuit
consisting of relays or FET switches can change an external decade
programmable gain amplifier, the Underscale control should be used
to decrement a PGA counter which downranges to higher gain.
Overscale should increment the PGA counter to cause an uprange to
lower gain or less attenuation. Underscale and Overscale are
positive-true pulses. They both should be sampled after the Busy
falling edge.
The decimal points can also be programmed by the autoranging
circuits to indicate what the range is.
WARRANTY INFORMATION
NOTE: Murata's Digital Panel Meters are warranted to be free from
defects in materials and workmanship when operated as described in
lhis brochure for a period of one year from the date of shipment. This
information is believed to be sufficient for the user to determine and be
respons'1ble for the selection, applicafion and specification of this
product for the user's intended usage. This warranty is expressed in
lieu of all other warranlles, expressed or implied, including the implied
warranty of fitness for a particular purpose and of all other
obligations or liabilities on the seller's part. The warranty neither
assumes nor authorizes any other person to assume for the seller any
other liabilities in connection with the sale of the said artlcles.
Suggested operating modes such as voltage attenuation or current
shunt measurement may include components which are internally
installed by !he user. Since the selection of these components and
the manner of installation is beyond Murata's control, the warranty
extends only to products which operate as standard, unmodified
units. This means that Murata will honor warranties on products
which have been restored to their original condition (that is, added or
modified components will have been removed by the customer
before returning the product for repair). Further, the customer must
insure that the product was not damaged by the addition and
removal of components. Such damage would void the original
product warranty.
As a practical matter, users have several alternatives to insure
warranty protection. Although this product is 100% functionally tested
and inspected, a thorough incoming inspection by the customer
should be considered before modification. Those original compo
nents of the DPM (displays, IC's, etc.) will be warranted if defective
(and, in Murata's opinion, not subject to catastrophic user damage).
Users may also partially remove components (one lead of a shunt
resistor, for example) to restore the DPM to original condition while
expediting return lo the user's modified condition, once DATEL has
repaired the product
The intent of this procedure is to allow rapid diagnosis and repair on
Murata's test fixtures. Because of the variety of possible OPM
modifications, Murata' test fixtures can only test unmodified products.
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5of6
DM-4200
DM-4102 SLAVE DISPLAY WIRING
{
+SVDC
POWER {
-
SIG.
IN
q
I [I l-1 l-1
'I. . 1. l. l
:
.i.
-
--
DM-4200
--
/
/
\
12 WIRES
SLAVE DISPLAY
A companion low-cosl slave display, Model DM-4102 is of·
fered by Murata for use with the DM-4200 Master DPM. The
DM-4102 can be used as a remote data repeater up to 25 feet
>
.i.1001-l[I
'I. ,. 1. l. 1
\
UPT0 25 FEET
DM·4102
away. A simple 12-wire interface. suitable for ribbon cable
connects as shown below. The Diagram shows both the DM4200 and DM-4102 connectors vertically to illustrate their as
sociated pin-out connections.
.-- ..
TYPICAL SLAVE CONNECTION DIAGRAM
[
(BOITOM) (TOP)
DEC. PT. 12.345
AB
POLARITY OUT
AUN/HOLD IN
BUSY/DONE OUT
STROBE OUT
--+--ANALOG HI IN
--+--ANALOG LO IN
DIG. 1 DRIVE (LSD)
DIG. 2 DRIVE
DIG, 3 DRIVE
DIG. 4 DRIVE
DIG. 5 DRIVE (MSD)
POWER COMMON
- 5V POWER OUT
DEC. PT. 1.2345
SIG, IN
DEC. PT. 1234.5
(BOITOM) (TOP)
DEC. PT. 12.345
DEC. PT. 1.2345
POSINEG POLARITY IN
DEC. PT. 123.45
ANALOG RETURN
REF. IN/OUT
DISPLAY TEST 18888
BOC 1 OUT----+-� I
BCD 2 OUT ----f-./l
BCD 4 OUT---+�J
BCD 8 OUT---+�
DISPLAY ENABLE IN
DEC. PT. COMMON
UNOERSCALE OUT
OVEASCALE OUT
+ 5V POWER IN
+ 5V POWER OUT
5
'
DIG. 1 DRIVE (LSD) IN
DIG. 2 DRIVE IN
DIG. 3 DRIVE IN
DIG. 4 DRIVE IN
DIG. 5 DRIVE (MSD) IN
POWER COMMON
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DEC. PT. 1234.5
2,2
11 DEC. PT. 123.45
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: 12:12'
1
!,3:13
[14'14 (
11shs !
DISPLAY TEST 18888
BCD 1 IN (LSB)
BCD 2 IN ----1
BCD4 IN
BCD 8 IN ---..../
DISPLAY ENABLE IN
DEC. PT. COMMON
+5V POWER IN---+�
+ 5V POWER OUT
(REAR CONNECTOR VIEW)
I
'-;
+
12-conduclor cable up to 25 feet (16m)
5Vdc power
DM·4200 MASTER DPM
A B
DM-4102 SLAVE DISPLAY
Undesignated pins are
no connection
PANEL INSTALLATION INSTRUCTIONS
The low profile case Is retained In a front panel
cutout by sliding the OPM housing In lhrough the
cutout opening and securing the housing from
the rear using 2 "L" brackets end screws. Pro,
ceed as follows.
1. Aller determining the correct position, lorm a
cutout in the mounllng panel. Refer lo the cut
out drawing for proper dimensions.
2. lnelafl the panel meter from Iha rront (display)
side ol the mounllng panel as shown.
3, There are two pairs of slots In th& sld& ol the
case to receive the L-brackels and retaining
screws. Most appllcatlons will use the front
pair of slots. For panels jhlcker than about
0.25 Inches (6 mm), use the rear slot pair.
4. A thin plastic molding may cover the selected
slots. Thls can be broken through wllh the L
brackets In the next step or can be removed us
ing a screwdriver or knife belore panel mount-
s. tf�emble the supplied 4-40 screws Into the L
brackets as shown, turning the screw until
several threads are engaged.
6. Using the screw as a·l'Bver, push the short slde
or the bracket Into the slot as shown and ro
tale the screw backwards v� turn until the
screw Is parallel to the ca90 side and the l
brackel Is lully captured In the case,
7. Lightly tighten tho screw9 against the front
panel.
Users front panel
with cut out
Brackets slots
{2 pairs)
Low profile
panel meter
......... �"L"flange
sealing brackets
(1 pair) and screws
Insert brackets
and rotate backwards
1 /, turn
CIRCUIT BOARD ACCESS
II access to the Internal circuit board is required,
bow the roar cover plate backward by prying up
In the center wllh a small screwdriver or knife
blade, 10 release the two catches in the side ol
the case, When reinstalling the circuit board,
first be sure the front llller ls flush against !he
Inside of the housing. The clrcull board engages
a pair ol guide tracks which are molded Inside
the case.
When relnstalllng the rear cover plate, be sure
the trim pot access hole Is to the lower lelt when
facing the rear. Compress Iha cover plate slightly
so that ll snaps Into the two retaining slot
catches al the rear sides.
II a second user,!abrlcated circuit board Is In·
stalled In the upper pair or board guide tracks,
the upper connector slot (II used) in !he rear
cover plate may be opened by using a knife from
Inside the cover.
-----------··-,-------- ---------------------
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A.
ISO 9001 and 14001 REGISTERED
www.murata-ps.com/support
6 of 6
This product is subject to the following operating requirements
and the Life and Safety Critical Application Sales Policy:
Refer to: http://www.murata-ps.com/requirements/
Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other
technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply
the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without
notice.
© 2012 Murata Power Solutions, Inc.