Minimum Depth Indicator - Less Than 2.5” (60mm) of
Space Required Behind the Panel
Stackable Mounting Bracket Included for
Easy Installation
3-1/2 Digit, 0.5” (12.7mm) High LCD Display with
Optional Negative Image, Bright Red Backlighting
Limited Range Display Scaling
Standard Screw Terminals for Easy Installation
Six Current Ranges: 200µA, 2mA, 20mA, 200mA,
2A, 5A
85-250VAC or 9-32VDC Power Supply
2.68”
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 and maintain the DIN standard
panel arrangements in 24mm by 72mm multiples. Panel cutout instructions for stacking multiple units are provided under “Stacking Features.”
Mini-Max M235 Series Digital Panel Meter
Installation and Panel Cutout
Simpson’s Mini-Max Current Indicators provide high quality,
accuracy and reliability in a compact, 60mm deep case.
Units offer 3-1/2 digit, 0.5” (12.7mm) LCD display and are
available with a bright red, negative image backlight option.
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
standard units have a clear viewing window, and the units
with optional negative image, red backlighting have a red
window.
DC Current
.88"
2.68"
2.36"
0.95"
0.16"
0.13" Max
Panel Thickness
2.84"
.874"
DISPLAY
Type: 7-segment LCD
Height: 0.5” (12.7mm)
Decimal point: 3 -position programmable
Overrange indication: Most significant digit = “1”
Backlighting: Optional negative image, red back-
lighting
Polarity: Auto with “-” indication, “+” implied
POWER REQUIREMENTS
AC Volt: 85-250VAC @40-440Hz
DC Volt: 9-32VDC
Power Consumption:
85-250VAC: 2.5VA min/4VA max
9-32VDC: 1.5VA min/3VA max
Rated Circuit to Ground Voltage: 750VRMS
ACCURACY @ 25°C
±(0.1% of reading + 1 count)
2A: ±(0.25% of reading + 1 count)
5A: ±(0.50% 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 Coefficient:
(⫾ 0.02% of input ⫾ 0.2 digits)/⬚C
Warmup time: Less than 20 minutes
NOISE REJECTION
NMRR: 60dB, 50/60Hz
CMRR: (w/1K⍀ unbalanced @ 60Hz): 90dB min
ANALOG TO DIGITAL CONVERSION
Technique: Integrating
Rate: 3 samples/second-typical
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: 3.5oz (99.2g)
Case Material:
94-0,UL rated glass-filled thermoplastic
Specifications
Wiring Display
Display Scaling
Mini-Max indicators have limited range coarse
and fine adjustments for display scaling. There
are no optional connections required for these
to function. The “coarse” calibration R12 will
allow a limited range of scaling values. 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,
which ever is lower. Example: a 2 AMP input
has a maximum reading of 1.999 counts, so
you cant double the 2 AMPs, but you can
make 1 AMP read 1.999. The “fine” calibration
R9 allows for an approximate range of 1% of
the “coarse” calibration. Apply full scale input
to the meter. Adjust R12 to be within 1% of the
desired scaled value, then use R9 to obtain the
final desired result.
Using a screwdriver or thumbnail,
spread tab on each side of case to
unlock top half. Lift rear top half and
slide away from front of meter.
Decimal Point: To select a decimal point, connect the appropriate DP pin (DP1, DP2, or DP3) to the DP COMMON (HOLD). Unused DP inputs
may remain unconnected (open).
Display Hold: Connect HOLD to DP COMMON (HOLD). If this feature is not required, the DP COMMON (HOLD) pin may remain unconnected
(open).
Input Signal: Connect the IN HI and IN LO to the signal to be monitored.
Input Power: Connect power to the L1 and L2 terminals. For AC powered units, L1 and L2 are not polarized.
For 9-32 DC powered units, L1 must be positive with respect to L2.
These instruments are designed for maximum safety to the operator when mounted in a panel according to instruc-
tions. They are not to be used unmounted or for exploratory measurements in unknown circuits.
Voltage Max Input
Range Resolution Drop (unfused)
200µA 100nA 200mV 10mA
2mA 1µA 200mV 40mA
20mA 10µA 200mV 100mA
200mA 100µA 200mV 400mA
2A 1mA 200mV 3A
5A 10mA 50mV 6A
INPUTS: DC Current
NNoottee::
Any physical damage to the meter during
calibration will void the warranty
(Input Signal) IN HI
(Input Signal) IN LO
DP3
DP2
DP1
HOLD
L1 (POS) (Power)
L2 (NEG) (Power)
EX (NEG)
EX (POS)
DP COMMON
(HOLD)
TOP HALF
OF CASE
FRONT
OF METER
LOCKING
TAB
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