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| 型號(hào)： | DPM3 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | The DPM 3 is the largest in our sub-miniature series of meters but still uses the same miniaturisation techniques to produce a very compact instrument |
| 中文描述： | 在DPM的3是我們的最大分的米微型系列，但仍然使用相同的微型化技術(shù)產(chǎn)生非常緊湊的工具 |
| 文件頁(yè)數(shù)： | 2/2頁(yè) |
| 文件大?。?/td> | 53K |
| 代理商： | DPM3 |
Specifications liable to change without prior warning
DPM 3 Issue 4 August/1997 M.C. Applies to DPM 3/1
PIN FUNCTIONS
1. V-
ONBOARD LINKS
Onboardlinkscanbemadewithasolderlinktoimplementfeatures.
DP1 MaketoturnonDP1(199.9).
DP2 MaketoturnonDP2(19.99).
DP3 MaketoturnonDP3(1.999).
REF Factorymade-ConnectsinternalreferencetoREFHI. Itshouldonlybecutifanexternalreferenceisused.
DPM3-negativepowersupplyconnection.
DPM3S -noconnection.
Negativemeasuringinput. Analogueinputsmustbenocloserthan1V toeitherthepositiveornegativesupply.
Positivemeasuringinput.
ThenegativesupplyoftheDPM3Sisgeneratedinternallyandmirrorsthepositivesupplyvoltage.
GroundforanaloguesectionofA/D converter,itisactivelyheldat2.8V belowV+ andmustnotbeallowedtosinkexcessivecurrent
(> 100 A)by,forinstance,connectingtoahighervoltage.
5. REFLO Negativeinputforreferencevoltage.
6. REFHI
Positiveinputforreferencevoltage(connectedviaLinkREFtointernalreference).
7. GND
DPM3-noconnection.
DPM3S-0V powersupplyconnection.
8. V+
Positivepowersupply.
9. TEST.
ConnecttoV+ todisplaysegments'-1888'. ItshouldnotbeoperatedformorethanafewsecondsastheD.C.Voltageappliedtothe
LCD may'burn'thedisplay. Thispinisnormallyat5V belowV+ andisthegroundforthedigitalsectionofthemeter.
10. XDP
AnnunciatorDriveWaveform,thisisaninversionoftheLCD backplanesignal.
11. BAT
Pinnotfactoryfitted. ConnectingthispintoXDP(pin10)willturnthebatteryannunciatoron(ensureLinkBAT isopenwhen
drivingannunciator). SeeApplicationsforlowbatterysensingcircuit.
2. IN LO
3. IN HI
4. COM
To comply with the Low Voltage Directive (LVD 93/68/EEC), input voltages to the module’s pins must not exceed 60Vdc. If voltages to the
measuring inputsdoexceed 60Vdc,thenfitscaling resistorsexternally tothemodule.TheusermustensurethattheincorporationoftheDPM
into the user’s equipment conforms to the relevant sections of BS EN 61010 (Safety Requirements for Electrical Equipment for Measuring,
ControlandLaboratoryUse).
SAFETY
VARIOUS OPERATING MODES
ON-BOARD LINKS: In order to quickly and easily change operating modes for
different applications the meter has several "on-board links". They are designed
to be easily opened (cut) or shorted (soldered).
Do not connect more than one meter to the same power supply if the meters cannot
use the same signal ground. Input filter should be as close as possible to the meter.
Taking any input beyond the power supply rails will damage the meter.
V+
V+
3IN HI
+
INPUT
VOLTAGE
Normally
SHORTED
Cut to
OPEN
Normally
OPEN
Solder to
SHORT
Measuring a floating voltage source
of 200mV full scale (DPM 3).
Measuring current. Supply MUST be
isolated (DPM 3).
Measuring a single ended input
referenced to supply (DPM 3S ).
Split supply operation (DPM 3).
Measuring the ratio of two voltages.
Reading = 1000 V /V
50mV< V < 200mV
V < 2V . (DPM 3)
1
2
Driving battery annunciator with
associated logic and low battery
detection circuitry.
Check Link REF is SHORTED.
Check Link BAT is OPEN.
Check Link REF is OPEN.
Check Link REF is SHORTED.
Check Link REF is SHORTED.
0V
V- (-7vmax.)
8
4
2
5
IN LO
REF LO
COM
1
1
V-
-
10nF
1M
V+
+ 5V
V+
8
4
2
5
3IN HI
IN LO
REF LO
GND
COM
7
0V
+
-
± 200mV
10nF
1M
± 200mV
V+
V+
8
6
2
5
3IN HI
IN LO
REF LO
REF HI
1V-
V-
+
+
-
-
V
1
V
2
10nF
1M
V+
V+
XDP
BAT
TEST
8
10
1
V-
1M
470k
1M
4077
11
9
SET
BC 237
V+ (7V max.)
V+
8
4
2
5
3IN HI
IN LO
REF LO
COM
V-
+
-
10nF
1M
V+
V+
8
4
R
5
3IN HI
IN LO
REF LO
1V-
V-
R=
0.2
I
FSR
P.O. Box 897, Windham, NH 03087
(603) 893-0886
(800) 821-0023
FAX (603) 898-6820
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