Mini-Max M235 Series Digital Panel Meter
Minimum Depth Indicator - Less Than 2.5" (60mm)
of Space Required Behind the Panel
Stackable Mounting Bracket Included for Easy
Installation
LCD: 3-1/2 Digit, 0.5" (12.7mm) High LCD
Display with Optional Negative Image, Bright Red
Backlighting
LED: 3-1/2 Digit 0.56" (14.2mm) High Display
Limited Range Display Scaling
Standard Screw Terminals for Easy Installation
LCD: Four Voltage Ranges: 200mV, 2V, 20V, 200V
LED: Five Voltage Ranges: 200mV, 2V, 20V, 200V,
600V
85-250V AC or Optional 9-32V DC Power Supply
DC Voltage
LCD
LED
Simpson’s Mini-Max Voltage Indicators provide high quality, accuracy, and reliability in a compact, 60mm deep case.
LCD display with an optional bright red, negative image backlight.
Display.
All units feature user-selectable decimal point, auto zero and limited
scaling capabilities.
Installation and Panel Cutout
2.68 " (68mm)
0.88" (22.2mm)
2.68"
(68mm)
2.36" (60mm)
2.84" (72mm)
0.95"
(24mm)
0.16"
(4mm)
0.13" (3.18mm) Max
Panel Thickness
0.874"
(22.2mm)
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.
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 maintain the DIN standard panel
arrangements in 24mm by 72mm multiples. Panel cutout instructions for
stacking multiple units are provided under “Stacking Features.”
DISPLAY
Type:
7-segment LCD or LED
Height:
LCD 0.5” (12.7mm)
LED 0.56” (14.2mm)
Decimal point: 3-position selectable
Overrange indication:
LCD Most signicant digit = “1”
LED Blinking Display
LCD Backlighting:
Optional negative
image, red backlight
Polarity:
Auto with “-” indication, “+” implied
Power Requirements:
AC Volt:
85-250VAC @40-440Hz
DC Volt: 9-32VDC
DCV
Power Consumption: (Non Fused)
85-250VAC: LCD 4.0VA (2.4W) Max
LED 3.6VA (2.16W) Max
9-32VDC: LCD 3 W Max
Isolation:
LED 2W Max
250VRMS Max
Noise Rejection
86dB Typical
CMRR:
ACCURACY @ 25°C
±(0.1% of Reading ±1 count)
ENVIRONMENTAL
Operating Temperature:
0 to 55°C
Storage Temperature: -10 to 60°C
Relative Humidity:
0 to 85%
non condensing @ 40°C
Temperature Coecient:
(0.2% of input
0.5 digits)/ C
Warmup time: Less than 20 minutes
Analog to Digital Conversion
Technique:
Integrating Dual Slope
Rate: 3 samples/second-typical
Mechanical
Bezel: 0.95” x 2.84” (24mm x 72mm)
Depth:
Panel cutout: 0.88” x 2.68”
2.36” (60mm)
(22.2mm x 68mm)
Weight: LCD 3.5oz (99.2g)
LED 2.6oz (74g)
Case Material: 94-0, UL-rated, glass-lled
thermoplastic
Connections
IN HI+
IN LO -
DP3
INPUT SIGNAL
Range
Resolution
200mV
2V
20V
200V
600V
LCD VERSIONS
DP1
DP2
HOLD
WARNING: These instruments are designed for maximum safety to the operator when mounted in a panel according to
M235
100uV
1mV
10mV
100mV
1V
Input
Impedance
10MEG
10MEG
10MEG
9.9MEG
9.9MEG
Max Input
Unfused
100Vdc
250Vdc
250Vdc
250 Vdc
600Vdc
DP3 DP2 DP1
LED VERSIONS
POWER
DP
POS
COMMON
instructions. They are not to be used unmounted or for exploratory measurements in unknown circuits.
NEG
EXCITATION
OUT
-DC
AC LINE
+DC
IN HI+
NOT
USED
INPUT SIGNAL
IN LO -
DP2
DP1
HOLD
DP3
COMMON
POWER
DP
POS
EXCITATION
NEG
OUT
-DC
AC LINE
+DC
Input Signal: Connect the DC sig nal to be monitored to the IN HI + and IN LO - 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 - DP3) 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.Hold Option:
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.
Display Scaling
Stacking Features
The mounting bracket, 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
erly in the hole.
remaining units.
TOP HALF
OF CASE
FRONT
OF METER
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 2 times the value of
the input, or a maximum reading of 1.999,
whichever is lower.
Example: A 2 volt input has a maximum
reading of 1.999 counts, so you cannot
double the 2 volts, but you can make a 1
LOCKING
TAB
LCD VERSIONS
Scale Adjustment:
The "Coarse" adjustment R12 will allow a
limited range of adjustment 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
LED VERSIONS
Scale Adustment:
The "Coarse" adjustment RV1 will allow a
limited range of adjustment 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
R12
R9
SCALE ADJ.
FINE
SCALE ADJ.
COARSE
Note: Any physical damage to the meter
during adjustment will void the warranty.
Vertical
Standard cutout
0.88" (22.2mm)
2.68" (68mm)
Vertical
SCALE ADJ.
FINE
SCALE ADJ.
COARSE
Note: Any physical damage to the meter
during adjustment will void the warranty.
0.071" (1.8mm)
Add to standard
when stacking
Horizontal
Standard cutout
0.88" (22.2 mm)
Horizontal
2.68" (68mm)
0.16" (4.0 mm)
Application Example
A company needs to monitor the power
5A DC UNIT
supply Voltage and load Current of a 12V,
4 Amp, DC
M235 LCD
motor.
Voltage: A Mini-Max 20V DC Volt Meter is
installed in parallel with the 12VDC power
supply. The IN HI+ terminal is connected to
the positive lead of the power supply. The
IN LO- terminal is connected to the negative
IN LO -
IN HI+
INPUT SIGNAL
DP3
DP2
DP1 HOLD
DP
COMMON
POS
EXCITATION
NEG
OUT
-DC
AC LINE
+DC
lead of the power supply.
Current: A second Mini-Max 5 ADC Ammeter
is connected in series with the DC MOTOR.
The IN HI+ terminal is connected to the positive lead of the power supply. The IN LOterminal is connected to the Positive lead
of the Dc Motor. The Negative Lead of the
DC motor is connected to the negative
terminal of the 12VDC supply. The Mini-Max
units will indicate the DC Motors supply
voltage and load current.
4A
DC MOTOR
12VDC
POWER SUPPLY
Ordering Information
Your Mini-Max Voltage Indicator can be congured by making an entry for each box
Basic Unit Display DPM Power Supply Range Excitation Output**
None
0
85-250VAC
3-1/2 Digit Indicator
M235
0
Non Backlight (LCD)
1
Negative Image Red (LCD)
2
RED LED
2
9-32VDC
Note: The display Hold feature is standard and user selectable.
11
200mV
12
2V
13
20V
14
200V
15
600V***
** 25 mAdc Max output
*** Not available for LCD
0
12VDC
1
24VDC
2
IN HI+
INPUT SIGNAL
20V DC UNIT
M235 LCD
IN LO -
DP3
DP2
Safety Symbols
DP
DP1
HOLD
COMMON
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.
POS NEG
EXCITATION
OUT
-DC
AC LINE
+DC
Accessories
Portable
Switchboard
External shunts enable digital meters to indicate
higher currents. A shunt is installed in series
between the source and load. The shunt produces a DCmV drop which is measured by the
Mini-Max meter. The Mini-Max can be scaled
to display the actual current between the load
and the source. Simpson manufactures portable
and switchboard shunts. Each portable shunt
includes 5’ leads.
Example : 25Amp DC is to be measured. A
Mini-Max M235 3 1/2 digit 200mVdc meter and
25Amp shunt, Cat. No. 06707, are selected for
this application. 25Adc owing through the shunt
generates 50mV which is applied to the IN HI+
and IN LO- inputs of the meter. The 50mV would
normally display as 50.0 on the meter. By using
the scale adjustments, the meters scale factor
may be adjusted to 1/2. The meter will now display 25.0 thus providing a 25 amp indication.
Ordering Information
Portable Shunts 50mV
Amps
1
5
10
15
25
30
50
75
100
150
200
Switchboard Shunts 50mV
Amps
100
150
200
250
300
400
500
Cat. Number
06700
06703
06704
06705
06707
06708
06709
06711
06713
06714
06715
Cat. Number
06500
06503
06504
06505
06506
06507
06508
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. 06-116065, Edition 17, 11/11
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