SM-Series
Specifications
Input Configuration:.......Single-ended, with optional provision to
offset the zero of the reading displayed
Input Impedance:............1M minimum
Full Scale Ranges:.........2VDC (Meters shipped with 2V range selected) 20VDC 200VDC All ranges are header programmable
A/D Converter:................12 Bit Dual Slope
Accuracy:........................(0.05% of reading + 2 digits)
Temperature Coefficient: 100ppm/C typical
Warmup Time:.................One minute to speci fied accuracy
Conversion Rate:.............3 readings per second
Display:.............................0.56" High efficiency LED's "Display Hold"
feature
Decimal Selection:..........User programmable to 3 positions
Over-range Indication:...When input exceeds full scale on any range being used, most significant "1" digit and polarity symbol are displayed with all other digits blank
Power Supply:.................+4.5 to +5.5V DC at 200mA
Operating Temperature:.. 0 C to +60 C
Storage Temperature:.....-20 to +70 C
Relative Humidity:...........95% (non-condensing)
Case Dimensions:...........Bezel 2.76 x 1.17 (69.75 x 29.7mm) Depth behind Bezel 3.32(84mm) plus 0.68 (17.27mm) for connector.
Weight:.............................88 gms (3.1 oz)
143 gms (5 oz) when packed
0.56 LED Display
The SM-Series meters have LCD or LED dis plays and offer many unique features designed to simplify installation, cal i bration and scaling. All SM-35 and SM-35X meters are pin-compat ible, which enables LED and LCD meters to be inter changed within the same panel without necessitating wiring or panel cutout changes.
All SM-Series meters are powered with bipolar single-ended in puts. The meters feature Display Hold, Display Test and AutoPolarity indication. The po lar ity indication may be disabled or re versed by repositioning jumper clips on internal header pins.
The SM-series of meters are designed to be user scalable to almost any en gi neer ing unit of readout. On-site scaling and recalibration is fa cili tated by multi-turn po ten ti ome ters that provide continuous fine and coarse ad just ment within each of the three header-pro gram mable full scale ranges.
The three ranges provided with the SM-35 (LED display) and SM-35X (LCD display) are 2V, 20V and 200V full scale and both of these meters can be ordered with an optional zero-offset ad just ment potentiometer.
The SM-35MV (LED display) and SM-35XMV (LCD display) are specially designed for low voltage inputs and provide three header-programmable input ranges of 20mV, 200mV and 2V full scale. Both the SM-35MV and SM-35XMV have zero-offset ad just ment po ten ti ome ters as a standard fea ture and a unique constant current power supply that eliminates any ground loop noise.
SM-35B
SM-35...............3.5 digit Red LED, 2 /20/200VDC, 5VDC Pwr SM-35MV........... 3.5 digit Red LED, 0.02/0.2/2VDC, 5VDC Pwr
SM-35X............. 3.5 digit LCD, 2 /20/200VDC, 5VDC Pwr
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They provide the greatest convenience and ease of use
Calibration Procedure
1) Select the DC Volt input range 20V or 200V by re-positioning the jumper clip on the range select headers indicated by and marked on the PCB Range select Header, shown on Component Layout section.
2) Input 0VDC, meter will automatically will display 000 or if Offset Pot (Optional) is installed, adjust pot until meter display 000.
3) Apply at least 95% of full voltage range, eg 19V for a 20
DCVolt range or 190 DCVolt for a 200V Range.
4) Adjust Span Coarse and Span Coarse Fine pot until meter
displays 19.00 (20V Range) or 190.0 (200V Range)
Zero Offset
(optional)
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Texmates exclusive Push-On Connectors combine an edge card connector and a 10 position screw terminal block.
Part Number:
CN-PUSH/SM
Pins 1,2 and 3 - Decimal Select: Connect either one of these pins to Pin 5 (common) to show decimal point.
Pin 4 - Dummy Zero: used only SM-35X model only.
Pin 5 - Decimal Select Common: Common return pins for decimal point selection, Hold, and Test.
Pin 6 - Signal High Input: Signal inputs for all voltage ranges are applied to these pins. Maximum overvoltage pro tec tion is 400V DC or 280V AC.
Pins 7 - +5V DC System Power Input: The meter requires a regulated low-ripple 5V DC power supply applied to these pins.
Pin 8 - Signal Low Input / Power Ground: Signal low input of the analog to digital converter circuits (Note: When measuring input signals (on the 2V range) that are not isolated from the +5V DC supply used to power the meter, a ground loop can be created that will cause the least significant digit to exhibit errors and instability. To avoid this problem, the ground return path of the analog signal should be connected to the power supply ground only at the Signal Low Input Pins 8 of the meter.).
Pin 9 - Display Hold Input (CMOS compatible): If Pin 9 is left open, the meter will operate in a free-running mode. Whilst Pin
9 is connected to Common Pins 5, the meter will latch up; A/D conversions will continue but the display will not be updated until Pin 9 is released.
Pin 10 - Display Test Input: All numeric display segments will operate when Pin 10 is connected to Common Pins 5.
CAUTION: The Display Test function is only intended for momentary operation. Continuous application of Display Test will, in time, damage the display.
Minus Sign Header
Activates Minus sign
on display
This header allows the Minus Sign to work normally.
Disable Minus sign
on display*
*Note: Removing the header disables Minus Sign
ZERO Potentiometer (Pot) Optional
The Optional ZERO pot when installed is to the left of the SPAN pots (as viewed from the back of the meter). Typically it enables the displayed reading to be offset 1000 counts.
SPAN Fine Potentiometer (Pot)
The 15 turn SPAN Fine pot is the middle pot (as viewed from the back of the meter). Typical adjustment is 10% of the input signal range.
SPAN Coarse Potentiometer (Pot)
The 15 turn SPAN Coarse pot is on the right side (as viewed from the back of the meter).
Typical adjustment is 100% of the input signal range.
RANGE SELECT Header
Range values are marked on the PCB. Three positions are provided. After selecting a new range with the single jumper clip, recalibration is required.
AM-20........... 20 segment LED bargraph, 5V DC power
CM-35XTL...... Less than 1V DC loop drop and 1 Joule energy storage CM-35XT....... Economical 4-20mA loop-powered meter
PM-45X......... 4.5 digit 0.48 LCD DPM PM-45XU....... Lower cost version of PM-45X PM-45L......... 4.5 digit 0.4 LED DPM PM-45LU........ Lower cost version of PM-45L
SP-35X.......... Signal Power DC voltage measurement from 5.0V DC to 199.9V DC
PS-505....... 5V DC Regulated Power Supply, 0.5A Output PS-510....... 5V DC Regulated Power Supply, 1A Output
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PANEL CUTOUT
FRONT VIEW
SIDE VIEW
TOP VIEW
When extra panel mounting tightness is required, optional Screw Mounting Clips can be purchased seperately and attach to the sliding mounting side clips
option metal
screw mounting clip
Standard Options for this Model Number
Special Options and Accessories
Part Number
Description
SM-35................ 3.5 digit Red LED, 2/20/200VDC, 5VDC Pwr...
DISPLAy
STANDARD......... Red LED, 0.96 inch high.....................
SM-GREEN... Green LEDs, for SM-35/35MV only..........
SM-BLUE.... Blue LEDs, for SM-35/35MV only............
Part Number
Description
SPECIAL OPTIONS (Specify Inputs & Req. Reading)
Z50K........ Zero offset 50 K Pot.
ZR-SM35-20V. Range change 0 to 20V DC. Display scaling 1999 ZR-SM35-200V Range change 0 to 200V DC. Display scaling 1999
ACCESSORIES
CN-PUSH/SM.. Push-0n Screw Terminal Block Connector.....
TB-KIT.......... Terminal Block Connector Kit (3)...............
SL.CASERED.. Slim Bezel Case, Red Faceplate w/Mtg Hrdwre PS-505....... 5V DC Regulated Power Supply, 0.5A Output..
PS-510....... 5V DC Regulated Power Supply, 1A Output...
1934 Kellogg Ave., Carlsbad, CA 92008 Tel: 1-760-598-9899 1-800-TEXMATE Email: [email protected]
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Texmate is an American manufacturer of high durability industrial grade panel meters, bar graphs, and transducers. Texmate's meters are frequently equipped with relays and various signal outputs for industrial automation applications and are known for their extremely long service life.