LCD
1
Rev. 06-15-16
Mini-Max M235 & M245
Digital Panel Meters
LED
• 3/64 DIN Indicator
• Unique mounting bracket allows stacking of multiple units
• Screw terminal connectors for easy installation
• LCD: 3-1/2 or 4-1/2 digit, 0.5” high LCD display with optional
negative image, bright red backlighting
• LED: 3-1/2 digit, 0.56” high display
• LED: 4-1/2 digit, 0.40” high display
• Limited range display scaling
Mini-Max M235 & M245
2
Rev.
06-15-16
Digital Panel Meters
Specifications
LCD LED
M235 M245 M235 M245
DISPLAY
Type 7 segment
thgieH 0.5” (12.7 mm) 0.56” (14.2 mm) 0.4” (10.2 mm)
Decimal Point (Selectable) 3 position 4 position 3 position 4 position
Overrange Indication Most significant digit = “1” Blinking Display
Backlighting Optional negative image, Red Backlight N/A
Polarity Auto with “ - “ indication, “ + “ implied
POWER REQUIREMENTS
AC Volt 85 - 250 VAC @ 40 - 440Hz
DC Volt 9 - 32 DCV Not Available
POWER CONSUMPTION
85 - 250 VAC LCD 4.0 VA (2.4W ) Max. 3.6 VA (2.16W ) Max.
9 - 32 DCV LCD 3W Max Not Available
ISOLATION 250 VRMS Max
ACCURACY @ 25º C
200 Hz ± 0.2% of input ± 0.2 Hz
2 KHz ± 0.2% of input ± 2 Hz
DC V & A ± (0.1% of Reading ± 1 count) ± (0.04% of Reading ± 1 count) ± (0.1% of Reading ± 1 count) ± (0.04% of Reading ± 1 count)
DC 2A ± (0.25% of Reading ± 1 count)
DC 5A ± (0.5% of Reading ± 1 count)
AC TRMS V & A ± (0.5% of Reading + 5 count)
( 50 Hz - 2 KHz )
DC Process ± (0.02% of Reading ± 1 count)
EXCITATION CURRENT 25mA (Maximum)
ENVIRONMENTAL 0 to 55ºC
Storage Temperature -10 to 60ºC
Relative Humidity 0 to 85% non condensing @ 40ºC
Temperature Coefficient 0.2% of input ± 0.5 digits / ºC
WARM-UP TIME Less than 20 minutes
NOISE REJECTION CMRR 86 dB Typical
A TO D CONVERSION
Technique
Rate 3 samples/second typical
FREQUENCY METER
Technique Frequency-to-voltage Not Available
INPUT LEVEL
(Frequency Meter) 500mV to 270 VRMS @ 1.0 Meg ohm
or 5V to 24V SquareWave
(DC offset = 2Vmax)
MECHANICAL
Bezel 0.95” x 2.84” (24 mm x 72 mm)
Depth 2.36” (60 mm)
Panel Cutout 0.88” x 2.68” (22.2 mm x 68 mm)
Weight 3.5 oz. (99.2 g) 2.6 oz. (74 g)
Case Material 94-0, UL-rated, glass-filled thermoplastic
± (0.5% of Reading + 50 count)
( 50 Hz - 2 KHz )
Integrating Dual Slope
± (0.5% of Reading + 2 count)
Not Available
( 50 Hz - 5 KHz )
Not Available
± (0.5% of Reading + 10 count)
( 50 Hz - 5 KHz )
Mini-Max M235 & M245
3
Rev. 06-15-16
Digital Panel Meters
Inputs
DC Voltage
Resolution
Range
200mV 100µV 10µV 10MEG 100VDC
2V 1mV 100µV 10MEG 250VDC
20V 10mV 1mV 10MEG 250VDC
200V 100mV 10mV 9.9MEG 250VDC
600V 1V 100mV 9.9MEG 600VDC
M235
DC/AC TRMS Current
Resolution LCD LED
Range
200µA 100nA 10nA 200mVDC 10mA 200mVDC 6mA
2mA 1µA 100nA 200mVDC 40mA 200mVDC 20mA
20mA 10µA 1µA 200mVDC 100mA 200mVDC 60mA
200mA 100µA 10µA 200mVDC 400mA 200mVDC 300mA
2A 1mA 100µA 200mVDC 3A 200mVDC 2.6A
5A 10mA 1mA 50mVDC 6A 100mVDC 6A
M235 M245
Resolution
M245
Input
Impedance
Voltage
Drop
Max Input
Unfused
Max Input
Unfused
Voltage
Drop
Max Input
Unfused
AC TRMS Voltage
Resolution
Range
200mV 100µV 10µV 500K 10VAC
2V 1mV 100µV 100K 100VAC
20V 10mV 1mV 1MEG 200VAC
200V 100mV 10mV 1MEG 200VAC
270V 1V 100mV 1MEG 270VAC
600V 1V 100mV 9.9MEG 600VAC
M235
Resolution
M245
Input
Impedance
Max Input
Unfused
DC Process
Resolution
Range
4 to 20mA 0.1% 0.01% 200mVDC 60mA
1 to 5VDC 0.1% 0.01% 10 MEG 250VDC
0 to 10VDC 0.1% 0.01% 10MEG 250VDC
0 to 100VDC 0.1% 0.01% 10MEG 250VDC
M235
Resolution
M245
Voltage
Drop
Input
Impedance
Max Input
Unfused
Mini-Max M235 & M245
4
Rev. 06-15-16
Digital Panel Meters
Ordering Information -
Mini-Max indicators can be configured by making an entry in each section below.
Example: M245-1-0-71-0.
_____ _____ _____ _____
I I I I I
Basic Unit Display DPM Power
Supply
Select From Each One Below Select From Each One Below
Basic Unit Function / Range (continued)
M235 3-1/2 Digit 31 200 VAC TRMS
M245
* Not Available on Frequency (Hz) Meters
Not Available on LED Display
**
Not Available on M245
***
† Not Available on LCD Display
† †
Not Available on M245 Frequency Meters
4-1/2 Digit
0 Non Backlit (LCD) 36
1 Negative Red Backlight (LCD) 35
2 Red (LED)
DPM Power Supply 42 2 ACmA TRMS
0 85 - 250 ACV 43 20 ACmA TRMS
2
9 - 32 DCV
Function / Range 46 5 ACA TRMS
11 200 DCmV
12 2 DCV 71 4 - 20 DCmA ( DC Process )
13 20 DCV 72 1 - 5 DCV ( DC Process )
14 200 DCV 73 0 - 10 DCV ( DC Process )
15
600 DCV
21 200 DCµA 82
22 2 DCmA 83
23 20 DCmA 84
24 200 DCmA
25 2 DCA Excitation Output
26 5 DCA 0
*
Display 34 200 VAC TRMS
*
†
32 2 VAC TRMS
33 20 VAC TRMS
41 200 ACµA TRMS
44 200 ACmA TRMS
45 2 ACA TRMS
81
1
2
Function/
Range
270 VAC TRMS
600 VAC TRMS
20 - 199.9 Hz RMS
20 - 1999 Hz RMS
20 - 199.9 Hz Sq. Wave
20 - 1999 Hz Sq. Wave
None
12 DCV @ 25mA
24 DCV @ 25mA
**
†
†††
Excitation
Output
&
**
***
&
**
***
&
**
***
&
***
**
†
Dimensions - M235, M245 & M240
5
Rev. 06-15-16
Mini-Max M235 & M245
Digital Panel Meters
Mounting Requirements -
Insert the Mini-Max through the panel, and then slide the mounting bracket on to the Mini-Max.
The mounting bracket allows Mini-Max units to be stacked side-to-side or top-to-bottom.
Panel cutout instructions for stacking multiple units are provided in the operator’s manual.
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