Mini-Max M245 Series Digital Panel Meters
Minimum Depth Indicator - Less Than 2.5” (60mm) of Space Required
Behind the Panel
Stackable Mounting Bracket Included for Easy Installation
LCD: 4-1/2 Digit, 0.5” (12.7mm) High Display with Optional Negative
Image, Bright Red Backlighting
LED: 4-1/2 Digit, 0.4” (10.2mm) High Display
Limited Range Display Scaling
Standard Screw Terminals for Easy Installation
Six Current Ranges: 200μA, 2mA, 20mA, 200mA, 2A, 5A
AC TRMS Current
LCD
LCD: 85-250VAC or 9-32VDC Power Supply
LED: 85-250VAC Power Supply
Simpson’s Mini-Max Voltage Indicators provide high quality,
accuracy and reliability in a compact, 60mm deep case.
LCD (Liquid Crystal Display) Units offer a 4-1/2 digit, 0.5”
(12.7mm) LCD display with an optional bright red, negative
image, backlight.
LED (Light Emitting Diode) Units offer a 4-1/2 digit, 0.4”
(10.2mm) display.
Installation and Panel Cutout
2.68” (68mm)
0.88" (22.2mm)
2.68"
(68mm)
LED
All units feature user-selectable decimal point, auto zero and
limited scaling capabilities.
A unique mounting bracket is provided to allow for vertical or
horizontal stacking of multiple indicators. All Mini-Max units
feature a 3/64 DIN, high-impact plastic case. The LCD
units have a clear viewing window and the LED units have a
red viewing window.
2.84" (72mm)
0.16"
(4mm)
0.95" (24mm)
2.36"
(60mm)
0.13" (3.18mm) Max
Panel Thickness
0.874"
(22.2mm)
Mounting Requirements
Insert the Mini-Max through the panel, and then slide the mounting bracket
onto the Mini-Max. The mounting bracket allows Mini-Max units to be
stacked side-to-side or top-to-bottom and to maintain the DIN standard
panel arrangements in 24mm by 72mm multiples. Panel cutout instructions for stacking multiple units are provided under “stacking features.”
Specications
DISPLAY
Type:
7-segment LCD or LED
Height: LCD 0.5” (12.7mm)
LED 0.4” (10.2mm)
Decimal point: 4-position selectable
Overrange indication:
LCD Most significant digit = “1”
LED Blinking display
LCD Backlighting:
red backlight
Optional negative image,
Polarity: Auto with “-” indication, “+” implied
POWER REQUIREMENTS
AC Volt:
85-250VAC @40-440Hz
DC Volt: 9-32VDC (LCD version only)
NOISE REJECTION
CMRR:
86dB typical
ACCURACY @ 25°C
LCD ±(0.5% of reading + 50 count)
(50 Hz - 2 KHz)
LED ±(0.5% of reading + 10 count)
(50 Hz - 5 KHz)
ENVIRONMENTAL
Operating Temperature:
0 to 55°C
Storage Temperature: -10 to 60°C
Relative Humidity: 0 to 85% non condensing
@ 40°C
Temperature Coefficient:
(0.2% of reading 0.5 digits) / C
Warmup time: Less than 20 minutes
MECHANICAL
Bezel:
0.95” x 2.84” (24mm x 72mm)
Depth: 2.36” (60mm)
Panel cutout: 0.88” x 2.68”
(22.2mm x 68mm)
Weight: LCD 3.5oz (99.2g)
LED 2.6oz (74g)
Case Material:
94-0,UL-rated glass-filled thermoplastic
Power Consumption: (Non Fused)
85-250VAC: LCD 4.0VA (2.4W) max
9-32VDC: LCD 3W max
LED 3.6VA (2.16W) max
ANALOG TO DIGITAL CONVERSION
Technique:
Rate: 3 samples/second-typical
Isolation: 250Vrms
ACA
TRMS
LCD
LCD
LED
Range Resolution Voltage Max Input Voltage Max Input
M245
Drop Unfused Drop Unfused
200uA 10nA 200mVdc 10mA 200mVdc 6mA
2mA
100nA 200mVdc 40mA 200mVdc 20mA
20mA
1uA 200mVdc 100mA 200mVdc 60mA
200mA 10uA 200mVdc 400mA 200mVdc 300mA
2A
100uA 200mVdc 3A 200mVdc 2.6A
5A
1mA 50mVdc
6A 100mVdc 6A
Connections
LCD VERSIONS
Integrating dual slope
LED
POWER
DP4 DP3 DP2 DP1
LED VERSIONS
NOT
USED
POWER
DP
AC IN
INPUT SIGNAL
AC IN
DP3
DP2
WARNING: These instruments are designed for maximum safety to the operator when mounted in a panel according to
DP4/
DP1
HOLD
instructions. They are not to be used unmounted or for exploratory measurements in unknown circuits.
COMMON
POS
EXCITATION
OUT
NEG
-DC
AC LINE
+DC
AC IN
AC IN
INPUT SIGNAL
DP3
DP2
DP1
DP4
DP
COMMON
POS
EXCITATION
NEG
OUT
AC LINE
Input Signal: Connect the AC signal to be monitored to the AC IN input terminals.
Input Power: For AC power, connect the AC POWER LINE to the AC LINE inputs. For optional DC power, connect the DC Supply to
the DC inputs. Observe polarity.
Decimal Point: To select a decimal point, connect the appropriate DP input pin (DP1 - DP4) to the DP COMMON output. Unused DP inputs
may remain unconnected (open).
Connect the DP COMMON output to the HOLD input. If this feature is not required, the HOLD pin may remain unconnected.LCD Hold Option:
Hold is optional on LCD versions only, replaces DP4 and is available from our modification center.
LCD Backlight
Option:
Negative image, bright red backlighting is available for the LCD versions only. This illumination allows the unit to be read in low
light areas. Backlighting power is supplied by the Mini-Max, so no additional external power is required.
Excitation Option: Excitation is available at the EXCITATION OUT Positive (POS) and Negative (NEG) terminals for powering external transmitters
or transducers. This source is isolated from the measurement input as well as the input power circuits. The voltages available
are 12Vdc or 24Vdc with a maximum load current of 25mA. This feature eliminates the need to mount an external DC power
source for transducers or sensors used in your application.
LCD Display Scaling
TOP HALF
OF CASE
FRONT
OF METER
LOCKING
TAB
LCD VERSIONS
Scale Adjustment:
The "Coarse" adjustment R12 will allow a
limited range of scaling values. The
"Fine" adjustment R9 allows for an adjustment range of approximately 1% of the
"Coarse" adjustment. Apply the full scale
input to the meter. Adjust R12 to be within
1% of the desired result. Then use R9 to
R12
R9
Using a screwdriver or thumbnail,
spread the tabs on each side of the case
to unlock the top half. Lift the rear of the
top half and slide it away from the front of
the meter.
Scale Adjustment:
Mini-Max indicators have limited range
scaling. There are no optional connections
required for these to function. The meter
can be scaled down to 1/2 the value of the
input, or scaled up to 1 times the value of
the input, or a maximum reading of 1.9999,
whichever is lower.
Stacking Features
LED VERSIONS
Scale Adustment:
The "Coarse" adjustment RV1 will allow a
limited range of scaling values. The
"Fine" adjustment RV2 allows for an adjustment range of approximately 1% of the
"Coarse" adjustment. Apply the full scale
input to the meter. Adjust RV1 to be within
1% of the desired result. Then use RV2 to
SCALE ADJ.
FINE
SCALE ADJ.
COARSE
Note: Any physical damage to the meter
during adjustment will void the warranty.
SCALE ADJ.
FINE
Note: Any physical damage to the meter
during adjustment will void the warranty.
SCALE ADJ.
COARSE
The mounting brackets, included with every Mini-Max, can be connected together. Multiple units can be mounted in a single opening,
allowing perfect alignment.
To punch one hole for multiple units, be sure to adjust the standard
panel cutout dimensions as shown here; otherwise the meters will not
fit properly in the hole.
Mounting multiple units is quick and easy. Install the first meter (bottom
unit first if stacking vertically). Position the next mounting bracket snugly
against the first one, and slide the second meter into place. Repeat for
remaining units.
Vertical
Standard cutout
0.88" (22.2mm)
2.68"
(68mm)
0.071" (1.8mm)
Add to standard
when stacking
Horizontal
Standard cutout
0.88" (22.2mm)
Vertical
2.68"
(68mm)
Horizontal
0.16" (4.0mm)
Add to standard when stacking
Application Example
A company needs to monitor the power
supply voltage (120VAC), load current (50
amps), and frequency (60Hz) of an AC
motor.
Voltage: A Mini-Max 200 Volt AC meter is
installed in parallel with the power supply.
Current: A Mini-Max 5 Amp AC meter
is attached to a 50:5 amp Donut Current
Transformer. The meter must be scaled
to display 50.00 when 5 amps are applied.
R9 and R12 ( L CD), RV1 and RV2 (LED)
are adjusted until the correct value is displayed. The meter is connected to the donut,
and the AC line is fed through the donut.
Frequency: A Mini-Max 200Hz Frequency
meter is installed in parallel with the power
supply. The wiring for the volt meter can
be split to to the frequency meter as long
as the voltage will not exceed 750 volts
AC. [Note: Frequency Me ter is available
in model M235 LCD only.]
IN HI IN LO
5 A AC UNIT
AC MOTOR
POWER SUPPLY
200 VAC UNIT
IN HI IN LO
200Hz Frequency Unit
Ordering Information Safety Symbols
Your Mini-Max Current Indicator can be configured by making an entry for each box
Basic Unit Display DPM Power Supply Range Excitation Output**
200µA
0
M245
4-1/2 Digit Indicator
Non Backlight (LCD)
0
1
Negative Image Red (LCD)
2
Red LED
Note: LCD display hold feature is configured at the factory and must be specified
at time of order.
Note: Special scaling is available from the factory at the time of ordering
2
85-250 VAC
9-32 VDC*
41
2 mA
42
20mA
43
200mA
44
2A
45
5A
46
*Not available for LED
**25mAdc max
0
1
2
None
12 VDC
24 VDC
Accessories
Donut Current Transformers enable the
Mini-Max to monitor AC current up to
5000 amps. The Donut (also known as
a “Toroid”) is placed around one of the
legs of the device being monitored and
emits up to a 5 amp signal. The MiniMax can be scaled to accurately display
the current being monitored. Each Donut
comes with 2’ long secondary leads.
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
Range/Amps
Pri Sec No.
50
75
100
150
200
250
300
400
500
600
750
1000
5 01293
5 01306
5 01297
5 01298
5 01299
5 01313
5 01300
5 01305
5 01301
5 02303
5 02459
5 02304
Cat.
SIMPSON ELECTRIC COMPANY 520 Simpson Avenue, Lac du Flambeau, WI 54538-0099 (715) 588-3311 FAX (715) 588-3326
www.simpsonelectric.com Printed in U.S.A Part No. 06-116073, Edition 22, 11/10
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