Models covered by this instruction sheet
DPM8100-2
3.5 DIGIT 200mV DC
DPM8100A-2
3.5 DIGIT 2V DC
DPM8120-2
3.5 DIGIT 200mV AC
DPM8120A-2
3.5 DIGIT 2V AC
DPM8140-2
3.5 DIGIT 200mV True RMS AC
DPM8400-2
4.5 DIGIT 200mV DC
DPM8400A-2
4.5 DIGIT 2V DC
DPM8420-2
4.5 DIGIT 200mV AC
DPM8420A-2
4.5 DIGIT 2V AC
The DPM8100-2 and DPM8400-2 series meters can be ranged as
voltmeters or ammeters by fitting multiplier or shunt resistors (not
included) into the labelled positions on the main printed circuit board
as shown on the diagram overleaf. Wire link "JP1" may need to be
removed for some voltmeter ranges.
Using close tolerance resistors, the minimum of recalibration is
required. For accurate setting a calibrated supply should be used. The
resistors fitted should be adequately rated for the current or voltage
range.
For non standard ranging and calibration, application sheet No.
AES040 is available on request.
Over range is indicated by -1 on the display for 3.5 digit meters and by
flashing zero's on the 4.5 digit meters
1
Remove instrument from its protective plastic bag and clip
off front cover.
2
Pull off the three green safety terminals from the rear of the
meter. The complete panel meter assembly can now be
removed from its case by carefully levering the base of the
LED display board over the plastic retaining lug while
pushing gently on the terminal pins at the rear.
3
With reference to the Range Specification table and notes
overleaf, determine the resistance values to be fitted for the
required voltage or current range. Further note whether link
"JP1" should be removed.
Carefully de-solder and remove link JP1 if necessary and
solder the required resistors in place as shown on the
main circuit board diagram.
4
The decimal point should be set as required by either
repositioning the PCB jumper link JP2 on the 3.5 digit
models or setting a dip switch on the front of the 4.5 digit
model, in one of these locations:-
DP1 gives 1.999 i.e. . XXX
DP2 gives 19.99 i.e. X. XX
DP3 gives 199.9 i.e XX. X
DP4 gives 1999.9 i.e XXX. X on 4.5 digit version only.
5
Slide panel meter back into its case along the guide rails
taking care to ease bottom of LED display board over
protruding lug. Then push the green safety terminals
securely back into place on the rear of the meter.
6
Make electrical connection to the meter with reference to
the Terminal Definition table. Note Mains Earth must NOT
be connected to pin 4 . There is no earth connection
required with this meter. Note also that Pin 3 is unused.
7
The instrument may now be tested.
For improved accuracy it can be adjusted by turning the
"span adj" potentiometer whilst applying full scale signal
from a calibrated source until exactly full scale is shown on
the display. On the DPM8140 and DPM8400 only, first set
the display to read zero for 0V input using the "offset"
potentiometer on the front left hand side of the board.
8
Finally, clip the cover back on and insert the meter into the
panel cut-out. "Snap" the mounting clips into the side of the
case (refer to installation diagram) and tighten the fixing
screws until secure in the panel - do not over tighten!
Accuracy:
81xx: +/- 0.1% of rdg +/-1 digit (AC models +/- 0.2%)
84xx: +/- 0.01% of rdg +/-2 digits DC models
84xx: +/- 0.1% of rdg +/-3 digits AC models
Line voltage:
115/ 230 volts +10, -20%, 50 - 60 Hz
Temperature:
0 - 50 degrees C
Humidity:
below 85% RH
Power:
4VA
Sampling rate: 2.5 / second
SYMBOL
DESCRIPTION
1
IN HI
Apply input to pins 1 and 2. If INLO signal
is greater than INHI the display will read
-ive.
2
IN LO
3
n/c
Not connected (unused)
4
Gnd (sig)
digital 0 Volts (NOT MAINS EARTH)
5
HOLD
(display)
connect to terminal 6 (+5V) 8100 series
connect to terminal 4 (0V) 8400 series
6
+5V (o/p)
internal +5V output (maximum 50mA)
7
230V
8
115V
AC mains supply
9
0V (N)
STEP BY STEP INSTRUCTIONS
TERMINAL DEFINITIONS
DIMENSIONS
INSTALLATION DIAGRAM
OPERATING SPECIFICATION
digital panel meters
user guide
DPM 8000 Series-2 Voltmeters and Ammeters
DPM\DP8000-2 Rev. 3 06/00
To measure voltages above the meters basic sensitivity, attenuator
resistors R17 and R18 need to be installed. The general equation to
determine their values is given by: V = V x (1 + R / R )
Where V is the input voltage required and V is the corresponding
display voltage. Note, V max is actually 199.9mV for a nominal
200mV basic sensitivity meter and 1.999V for a nominal 2V meter
Examples
For standard input ranges choose the corresponding resistors from
the range specification table below.
For R18, on all voltage ranges, use metal film resistors, 1%, 0.25W
IN
D
17
18
IN
D
D
For inputs greater than 200V, R17 must be a high voltage resistor
such as Philips VR37 Series (1x2M2, 0.5W, RS164-8316) with
R18=2k2 Alternatively, use two carbon film resistors in series, such as
Multicomp MCF (2x1M2, 0.5W, Farnell 262-195) with R18 as 2K4.
See the options for R17 below. The maximum input voltage on this
range with correct resistors is 650V.
For ranges of 200V or less, for R17, use metal film resistors, 1%, 0.5W
as Farnell 545-314. For basic 200mV use only existing link JP1
On current ranges, use metal film resistors, 0.5W for R30. The current,
using internal shunt resistor R30 must not exceed 2 Amps. Leave link
JP1 in place
The power supply input protection fuse is a 20mm cartridge type rated
at 250V / 100mA.
1
2
3
5
6
4
VR2
Decimal point
select jumper
on 3.5 digit
models
Decimal point
DIP switch
on 4.5 digit
models
Zero offset
adjust (where
fitted)
8100, 8120, 8140
8400, 8420
8100, 8120, 8140
8400, 8420
8100, 8120, 8140
8400, 8420
8100, 8120, 8140
8400, 8420
8100, 8120, 8140
8400, 8420
8100, 8120, 8140
8400, 8420
8100, 8120, 8140
8400, 8420
8100A, 8120A
8400A, 8420A
8100A, 8120A
8400A, 8420A
8100A, 8120A
8400A, 8420A
8100A, 8120A
8400A, 8420A
R18
R30
LINK
JP1
RANGE
REQUIRED
BASIC
SENSITIVITY
MODEL NUMBER
R17
8100, 8120, 8140
8400, 8420
0.2V
200mV
200mV
200mV
IN
2V
OUT
OUT
OUT
OUT
OUT
1M
110K
20V
1M
10K
1K
200 A
200mV
200mV
200mV
200mV
200mV
IN
100R
2mA
IN
10R
20mA
IN
1R
200mA
IN
2V
2V
IN
110K
20V
2V
1M
10K
200V
2V
1M
2K2
650V
(see note 2)
2V
2M2
0R1
2A
IN
RESOLUTION
(of range required)
OVERLOAD
PROTECTION
100V
100V
300V
100V
100V
300V
700V
INPUT
IMPEDANCE
100 V
10mV
1mV
1mV
100 V
10mV
1mV
100mV
10mV
1V
100mV
0.1 A
10nA
1 A
0.1 A
10 A
1 A
100 A
10 A
1mA
100 A
1mV
10 V
100 V
1M
IM
>I00M
>I00M
IM
IM
Ik
IR
2M2
IOOR
IOR
R1 (0.1)
DO NOT
EXCEED
DISSIPATION
RATING OF
SHUNT
RESISTOR
RC
(SEE NOTE 5)
Important
Observe the mains
input connections
VR1
VR2
OFFSET
addition.
JP2
SPAN
ADJUST
LINK
JP1
1
2
3
F1
230
Vac
115
Vac
0
Vac
7
8 9
R30
R17
R18
In
Hi
In
Lo
0v
dc
Hold
i/p
+5V
dc
4 5 6
1 2 3
N/c
Power supply
i n p u t f u s e
100mA rated
(see Note 6)
Options for Resistor R17
Single Hi
Voltage resistor
Two carbon
film resistors
Link JP1
200mV and
current
Ranges below
200V
R17
R17
Solder
R17
Metal film
resistor
Ranges above 200V
R17
anders
electronics plc
Bayham Place, London NW1 OEU UK
Tel: +44 (0)20 7380 8167 Fax: +44 (0)20 7874 1908 http://www.anders.co.uk
V
IN
V
D
Display
R
17
R
18
20V
10V
1.999V
1.5V
1M
1M
110K
176K
19.99V
1500rpm
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