Page 1
Minimum Depth Indicator - Less than 1.25" (31.75mm)
of Space Required Behind the Panel
Fits 3/64 DIN Cutout, 22mm x 68mm
4-1/2 Digit, 0.5" (12.7mm) High LCD
User-Selectable Decimal Point
Optional Negative Image, Bright Red Backlighting
12 Pin Mating Connector With 6" Lead Wires Included
for Easy Installation
Display Hold Standard on All Units
Four Current Ranges: 200A, 2mA, 20mA, 200mA
Three Power Supply Alternatives: 5VDC, ±5VDC or
9VDC (With Low Battery Indication)
Mini M145 Series Digital Panel Meter
Installation and Panel Cutout
No mounting hardware required, snaps right into panel!
Mounting Requirements
The Mini indicators require a panel cutout of 2.68" (68mm) wide by 0.88"
(22mm) high, and a panel area of 0.945" (24mm) high by 2.84" (72mm)
wide. The depth behind the panel, including terminals, is 0.7" (17.8mm).
The front bezel protrudes 0.158" (4mm) from the front of the mounting
surface. The unit will snap-mount into panels from 0.050" to 0.125" thick.
A 12-pin connector with 6" wire leads is included with each unit for quick
installation.
Simpson’s Mini DC Current Indicators provide high quality,
accuracy and reliability in a compact 12mm deep case.
M145 has a 4-1/2 digit, 0.5” LCD display and is available
with a negative image, bright red backlight option. Mini
M145s feature user-selectable decimal point and display
hold.
Three power supply choices are available, and a low battery
indication is provided for 9VDC battery applications. Mini
units feature a standard 3/64 DIN, high-impact plastic case.
The standard LCD units have a clear viewing window. The
units with optional negative image, bright red backlighting,
have a red window.
DC Current
Page 2
DISPLAY
Type: 7-segment LCD
Height: 0.5” (12.7mm)
Decimal point: 3-position programmable
Overrange indication: Most significant = “1”
Backlighting: Optional negative image, red
backlighting at 5, 10, 12, 24, or 48VDC
Polarity: Auto with “-” indication, “+” indication
implied
POWER REQUIREMENTS
DC Power: ±5V, +5V, and +9V
(Low battery indication provided with 9V units)
Power supply current: 2mA max
Backlight supply current: 50mA typical
For 24 and 48VDC, 10mA typical
ACCURACY @ 25°C:
±(0.04% of reading + 1 count)
ENVIRONMENTAL
Operating Temperature: 0 to 55°C
Storage Temperature: -10 to 60°C
Relative Humidity: 0 to 85% non-condensing
Warmup time: Less than 20 minutes
Temperature Coefficient: (All inputs)
⫾ (0.2% of input ⫾ 0.2 digit) /⬚C
NOISE REJECTION
NMRR: 60dB, 50/60Hz
CMRR: (with 1KV unbalanced @ 60 Hz): 90dBmin
ANALOG TO DIGITAL CONVERSION
Technique: Integrating
Rate: 3 samples/second-typical
MECHANICAL
Bezel: 0.945” x 2.835”
(24mm x 72mm)
Depth: 0.473” (12mm)
Panel cutout: 0.874” x 2.677”
(22.2mm x 68mm)
Weight: 10oz (28.3g)
Case Material: 94-VO, UL-rated ABS
Specifications
Connections
Safety Symbols
These instruments are designed for maximum safety
to the operator when mounted in a panel according
to instructions. They are not to be used unmounted
or for exploratory measurements in unknown circuits.
A reversed polarity power supply will permanently
damage this instrument.
IN HIGH and IN LOW must remain within the limits of
the power supply breakdown voltage.
No internal isolation provided. Each meter requires
an isolated power supply. Supply voltage must also
be isolated from the circuit being measured.
A positive reading will be displayed when IN Hi is
more positive than IN Low.
Internal Reference: REFOUT must always be connected to REFIN unless an external reference is
being used.
External Reference: Connect between REFIN and
ANALOG GROUND; REFOUT should then be unconnected (open). For best results, external reference
voltage should be in the range of 50mV to 150mV.
System stability is then only as good as the external
reference.
Calibration
Model M145 has two internal adjustments on the
rear panel, one that is covered by a label, and one
that is always exposed. The exposed adjustment is
a
“
fine” calibration point, and the covered adjustment
is for “coarse” calibration. Apply an appropriate current input for a near full scale reading, typically 19000
counts on the display. For these adjustments to
function, REFOUT must be connected to REFIN.
Once a unit has been calibrated with the “coarse”
adjustment, future calibrations should be performed
with the "fine" adjustment only.
Backlight Power Supply
A 2-pin connector is included with the unit if backlighting is specified. The right pin is the Positive, and
the left pin is for the Negative power supply. See the
Rear Connections
diagram for location.
Mini M145
Rear Connections
In Hi Analog DP4 Negative REFIN DP2
Ground Supply
Positive
In Low REFOUT Supply Hold DP1 DP3
5
VDC
Input Signal
+
-
In Hi Analog DP4 Negative REFIN DP2
Ground Supply
Positive
In Low REFOUT Supply Hold DP1 DP3
-5
VDC
Input Signal
+5
VDC
Decimal Point
Decimal Point: DP 1 is the first decimal
point to the left of the least significant digit.
Connect DP# to Positive Supply to activate.
Unneeded features should remain unconnected.
Display Hold: The display can be held
indefinitely by connecting Hold to Positive
Supply. The display will function normally
when this connection is removed.
In Hi Analog DP4 Negative REFIN DP2
Ground Supply
Positive
In Low REFOUT Supply Hold DP1 DP3
9
VDC
Input Signal
+
-
±5 VDC Power Supply
+5 VDC Power Supply
9 VDC Power Supply
Optional Connections
The WARNING sign denotes a hazard. It
calls attention to a procedure, practice, or
the like, which, if not correctly performed
or adhered to, could result in personal
injury.
The CAUTION sign denotes a hazard. It
calls attention to an operating procedure,
practice, or the like, which, if not correctly
adhered to, could result in damage to or
destruction of part or all of the instrument.
Ordering Information
Non Backlight
Negative Image Red
Basic Unit Display DPM Power Supply Range Backlight Power
M145
0
1
2
0
1
0
1
2
3
4
5
21
22
23
24
4-1/2 Digit Indicator
+5VDC
±5VDC
+9VDC
200A
2mA
20mA
200mA
None
5VDC
10VDC
12VDC
24VDC
48VDC
Mini Current Indicators can be configured by making an entry for each box
INPUTS: DC Current
Voltage Maximum
Range Resolution Drop Input (unfused)
200A
10A 200mV 10mA
2mA
100A 200mV 40mA
20mA
1A 200mV 100mA
200mA
10A 200mV 400mA
DP3
DP2
DP1
DP4
In Hi Analog DP4 Negative REFIN DP2
Ground Supply
Positive
In Low REFOUT Supply Hold DP1 DP3
SIMPSON ELECTRIC COMPANY 520 Simpson Avenue, Lac du Flambeau, WI 54538 • (715) 588-3311 • FAX (715) 588-3326
www.simpsonelectric.com Printed in U.S.A. Part No. 6-115973, Edition 11, 05/07
Loading...