Texmate PM Series User manual

Texmate, Inc. Tel. [phone] • www.texmate.comPM-35XAC Manual (X3) Page 1
110/220VAC Powered LCD Differential Input and Autoranging Meters.
PM-35XAC110
115 VAC Powered Panel Meter
PM-35XACAR1
Autoranging Option for XAC110
Please see A1 picture on Pg.3
General Features Specifications
PM-Series, high performance versatility for a wide range of applications
PM-35A...................3.5 digit Red LED, Precision Preference, 2VDC, 5VDC Power
PM-35U...................3.5 digit Red LED, Low Cost, 2VDC, 5VDC Power
PM-35X...................3.5 digit LCD, Low Power Consumption 2VDC, 5VDC Power
PM-35XAC110 ........3.5 digit LCD, 2VDC, 120VAC Power
PM-35XACAR1 .......3.5 digit LCD, Autoranging, 120VAC Power
PM-45L ...................4.5 digit Red LED, Precision Meter w/Differential Input
PM-45LU.................4.5 digit Red LED, Low Cost Meter w/Differential Input
PM-45X...................4.5 digit LCD, Precision Meter w/Differential Input
PM-45XU ................3.5 digit LCD, Low Cost Meter w/Differential Input
Input Configuration:......True differential and single-ended
Full Scale Ranges: ........±199.9mVDC
±1.999VDC (standard)
±19.99VDC
±199.9VDC
±1200VDC
Input Impedance:...........Exceeds 1000MΩ on 200mV and
2V ranges; 10MΩ on all other
ranges
Input Protection:............±500VDC or 350VAC maximum on
200mV and 2V ranges; ±1200VDC
or 850VAC on all other ranges
Accuracy: .......................±(0.05% of reading + 1 digit)
Temperature Coefficient: ..5PPM/°C in ratiometric operation; 50
PPM/°C Typ. using internal reference
on 200mV and 2V ranges
Warm Up Time: ..............10 seconds to specified accuracy
Conversion Rate:...........3 readings per second nominal; user
programmable from 1 to 10 readings
per second
Display:...........................0.48" LCD
Decimal Selection: ........User programmable to 3 positions
Overrange Indication: ...When input exceeds full scale on
any range being used, most
significant “1” digit & polarity symbol
are displayed with all other digits
blank
Power Requirements: ...110VAC or 220VAC, 5% at 50Hz,
117V or 230VAC, 5% at 60Hz and
400Hz. Regulated 9VDC to 15VDC
at 6mA to 15mA
Operating Temperature:....0° 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)
PM-Series
Typical Application Connections
View more application connections and connection
instructions on page 3.
SINGLE-ENDED METER - 200mV RANGE, >2V RANGE
For 200mV Range: 1) Omit R1 and R2; 2) Change R6 from 470kΩ to
47kΩ; 3) Change R8 from 619Ω to 121Ω; 4) Change R9 from 4.32kΩ
to 12.1kΩ; 5) Change C4 from 0.047µF to 0.33µF; 6)Change C7 from
0.1µF to 2.2µF. For>2V RANGE; 1) Install R1 and R2 as specified
under section titled Use ful Tables.
The PM-35XAC is a precision AC powered panel meter that
mea sures true dif fer en tial and single-ended DC voltages over
five user pro gram ma ble ranges from ±199.9mV to ±1200V full
scale. The 1500V isolation provided by the internally mounted
miniature 110 or 220VAC mains transformer eliminates most
of the trou ble some ground loop problems associated with DC
powered DPM's. Alternatively, where appropriate, a DC power
supply of 9 to 15VDC can be used. Since the meter draws only
a small constant current, operation from higher DC voltages is
also possible merely by use of a voltage dropping resistor in
series with the meter.
The true differential capability of the Model PM-35XAC permits
accurate mea sure ments of very small input signals in presence
of much larger common mode signals. It is ideal for measuring
various balanced trans duc ers and bridge inputs.
The high contrast long-life liquid crystal display also offers 8
user pro gram ma ble de scrip tors for direct indication of the type
and range of signals being mea sured.
3 1/2 DIGIT 0.48” LCD

Texmate, Inc. Tel. [phone] • www.texmate.comPage 2 PM-35XAC Manual (X3)
Functional Diagram
Connector Pinouts
The Texmate Model PM-35XAC interconnects by means of a
standard PC board edge connector having two rows of 15 pins
each, spaced on 0.1" centers. Connectors are available from
Texmate, or form almost any connector manufacturer.
A
B1 2 345 6 7 8 9 10 11 12 13 14 15
1 2 345 6 7 8 9 10 11 12 13 14 15
CALIBRATION
POTS
Pin A1 - Reference Voltage Output: Internal precision voltage reference.
Standard output is 1.000V, adjustable by ±5% with R10 potentiometer. Usable
voltages from 0.05V to 5.0V for special high impedance scaling can be obtained
by changing the value of internal dividing resistors R8 and R9. It should be noted
that when Pin A1 is referred to System Ground Pin B13 the potential is +1.0V.
However, when Pin A1 is referred to Analog Common Pin B2, the potential is
-5.9V.
Pin A2 - Signal Low Input: Signal low input of A to D converter. Maximum over-
voltage protection is ±500VDC or 350VAC.
Pins A3, A4, A5, A6, A7, A8, A9 and A10 - Descriptors: These are the pins for
the descriptors “m” for mA, K, Ω, A, V, DC, AC, and “m” for mV, respectively. They
may be displayed as required by connecting the appropriate pin(s) to Decimal/
Descriptor Select Common Pin B11; any number of descriptors can be turned on
at the same time. An open circuit will turn off a descriptor; however, static current
pickup and/or PCB leakage of more than 100nA can cause descriptors to turn on
undesirably. Therefore, it is recommended that any unused descriptors be con-
nected to Backplane Output Pin B10 either directly or by a resistor of less than
5MΩ to insure an off condition. CAUTION: Any DC component introduced to the
display drive circuitry can, in time, cause permanent damage.
Pin A11 - “-” Polarity Sign Input: Pin A11 is the negative sign segment of
LCD. For normal operation, Pin A11 is connected to Decimal/Descriptor Select
Common Pin B11. For reversed polarity sign indication, connect Pin A11 to “+”
Polarity Sign Output Pin B12 and connect “+” Polarity Sign Output Pin A12 to
Backplane Output Pin B10. This will cause the minus sign to be displayed when
a positive signal is present. However, in this configuration the plus sign must be
assumed when a negative signal is present.
Pins A12 - “+” Polarity Sign Input: Pin A12 is the positive sign segment
of the LCD. For normal operation, Pin A12 is connected to “+” Polarity Sign
Output Pin B12. SEE DESCRIPTION OF PIN A11 FOR REVERSED POLARITY
OPERATION.
Pins A13, B14, and A15 - No Connection: The PCB pads which would normally
correspond to these pins do not exist on the PCB.
Pin A14 - AC Power Input: Connect one side of the 117V or 230VAC power
input to Pin A14. Model PM-35XAC110 is operated from 110V at 50Hz or 117V
at 60Hz to 400Hz, Model PM-35XAC220 is operated from 220V at 50Hz or 230V
at 60Hz to 400Hz.
Pin B1 - Reference Input: Reference voltage input for A to D converter. Normally
supplied from Pin A1. An external reference source referred to Pin B13 may be
used instead. Pin A1 may be used as an input for ratiometric measurements.
Minimum usable voltage is 0.05VDC, with a maximum voltage of 5.0V. For rati-
ometric operation, displayed reading =1000 X (Signal input Voltage÷ Reference
input Voltage). The maximum signal input voltage is 5V. Higher voltages must
be scaled down through a voltage divider. Reference input voltage must remain
stable during measurement period. NOTE: Consideration should be given to the
common mode voltage of the input signal as the system common mode voltage
range referred to Analog common Pin B2 is -5V to +2V whereas referred to
System Ground Input Pin B13 the common mode voltage range is +2V to +8V.
Pin B2 - Analog Common: Pin B2 is common for the analog section of the meter
which is normally +6.9V above System Ground Input Pin B13. Pin B2 should
not be connected to System Ground Input Pin B13 due to the fact that Analog
Common is regulated to provide the primary precision voltage source for the
Reference Voltage Output Pin A1. This voltage is also the source from which the
offset voltage Output Pin B3 is derived.
Pin B3 - Offset Voltage Output: With the addition of a 3/4" 50KΩ potentiometer
in the R15 position on the PC board, 0 to +6.9V is available from Pin B3 which is
referred to either system Ground Pin B13 or Analog common Pin B2.
Pin B4 - Signal High Input: Pin B4 is the signal high input for all input signals.
When attenuation is not required, the resistor position R1 should be shorted by
a jumper. Dividing resistors may be mounted internally in R1 and R2 positions
to attenuate voltages up to 1200V max. Matched dividing resistors for the 20V
(1/10), 200V (1/100), and 1200V (1/1000) ranges are available from Texmate.
Shunt resistors for current measurements up to 200mA may also be internally
mounted in the R2 position. The current loop is then applied to Pin B4 and
returned thorough Signal Low Input Pin A2.
Pin B5 - +12VDC Power Output: When the meter is operated from an AC
source, Pin B5 provides a +12VDC output, which may be used to power external
circuitry. The maximum auxiliary load is 1mA. When the meter is powered from
a 9 to 15VDC source, Pin B5 becomes the positive terminal of the power input.
NOTE: In some circuit configurations the input signal must be isolated from the
DC power supply.
Pin B6 - Display Test: All display segments will operate when Pin B6 is connect-
ed to 12VDC Power Output Pin B5. The Display Test function is only intended for
momentary operation. Continuous application of Display Test will in time damage
the display.
Pins B7, B8, and B9 - Decimal Select: Decimal points may be displayed as
required by connecting appropriate pin to Decimal/Descriptor Select Common Pin
B11. CAUTION: Decimal display pins have the same operating characteristics as
Descriptor pins and likewise may be damaged from a DC component introduced
by leakage or inadvertent connection to system ground.
Pin B10 - Backplane Output: Liquid crystal displays are operated from an AC
signal. The backplane is the common base of the LCD capacitance structure and
is continuously driven by a square-wave signal at approximately 60Hz. Those
segments that are driven 180˚ out-of-phase with Pin B10 will turn on.
Those segments that are driven in-phase with Pin B10 will turn off.
PIN B11 - Decimal/Descriptor Select Common: Pin B11 is 180° out-of-phase
with Backplane Output Pin B10. Thus, it serves as a common for the descriptors,
decimal select, and the “-” polarity sign. As required, Pin B11 may be connected
to Decimal Select Pins B7, B8, B9 and to Descriptor Pins A3, A4, A5, A6, A7,
A8, A9, A10. The “-” Polarity Sign Input Pin A11 is also connected to Pin B11 for
standard polarity indication.
Pin B12 - “+” Polarity Sign Output: Pin B12 is in-phase with Backplane Output
Pin B10 for negative signal inputs and out-of-phase for positive signal inputs.
Connect Pin B12 to "+" Polarity Sign Input Pin A12 for normal operation. SEE
DESCRIPTION OF PIN A11 FOR REVERSED POLARITY OPERATION.
Pin B13 - System Ground: Pin B13 is the ground return for +12VDC Power
Output, and serves as Power Ground Input (negative side of power supply) when
the meter is powered from 9 to 15VDC source.
Pin B15 - AC Power Input: Connect one side of the 117V or 230VAC power
input to Pin B15.
Component Layout
R15
C7
C5
R7C8U1R16VR1R11R10
R15
R2
R9
R1
R8
R13
R4 C6
C4
R5
R6
C1
R3
R12
Calibration Procedure
After making the appropriate connections as shown in the instructions
apply power to the meter. Then, with a precision DC reference source,
apply +1.900VDC between Signal High Input Pin B4 and Signal low
Input Pin A2. Adjust R10 potentiometer (on left side as viewed form
rear) until the display reads +1.900V. NOTE: This calibration voltage is
for a ±1.999V F.S. meter. For other ranges, the voltage applied should
be similarly proportionate to the selected full scale voltage.
CAUTION: This meter employs high impedance CMOS inputs. Although internal
protection has been provided for several hundred volt overloads, the meter will
be destroyed if subjected to the high kilovolts of static discharge that can be
produced in low humidity environments. Always handle the meter with ground protection.

Texmate, Inc. Tel. [phone] • www.texmate.comPM-35XAC Manual (X3) Page 3
Signal Conditioning Components
SPAN Potentiometer (Pot)
The SPAN pot is on the right side of the dis-
play. Typical adjustment is 20% of the input
signal range.
ZERO Potentiometer (Pot) optional
The ZERO pot is on the right side of the SPAN
Pot. Typically it enables the displayed reading
to be offset ±500 counts.
DIFFERENTIAL METER - 200mV RANGE, 2VRANGE WITH COMMON MODE
VOLTAGE FROM -2.8V TO +2.8V
For 200mV Range: 1) Omit R1 and R2: 2) Change R6 from 470kΩ to 47kΩ; 3)
Change R8 from 619Ω to 121Ω; 4) Change R9 from 4.3kΩ to 12.1kΩ; 5) Change
C4 from 0.047µF to 0.33µF; 6) Change C7 from 0.1µF to 2.2µF.
For >2V Range: Install R1 and R2 as specified under section titled Useful Tables.
DIFFERENTIAL METER: 200mV RANGE, >2V RANGE WITH COMMON MODE
VOLTAGE FROM -5V TO +2V
For 200mV Range: 1) Omit R1 and R2; 2) Change R6 from 470kΩ to 47kΩ; 3)
Change R8 from 619Ω to 121Ω; 4) Change R9 from 4.3kΩ to 12.1kΩ; 5) Change
C4 from 0.047µF to 0.33µF; 6) Change C7 from 0.1µF to 2.2µF.
For >2V Range: Install R1 and R2 as specified under section titled Useful Tables.
DIFFERENTIAL RATIOMETRIC OHMMETER
1) Install RS and RT specified under section titled Useful Tables; 2) Install RL
with a value equal to 3 x (RS + RT)for use as a current limiting resistor.
NOTE: Full Scale Range =(RS+RT) x 2
Displayed Read ing = RX÷(RS + RT) x 1000.
RXis device under measurement.
SINGLE-ENDED CURRENT METER
1) Connect meter as for 200mV voltmeter; 2) Install RS NOTE: RS must be
externally mounted when F.S. current is greater than 200mA, and 4-wire type con-
nection should be used. For currents of 200mA F.S. or less. RS may be in ter nal ly
mounted in the R2 position. Standard values for RS are specified under section
titled Useful Tables.
F.S. In Rs External Resolution
20A 0.01 10mA
2A 0.1 1mA
F.S. In Rs Internal Resolution
200mA 1 100µA
20mA 10 10µA
2mA 100 1µA
200µA 1k 100nA
F.S. In Rs+RTResolution
200 100 100m
2k 1k 1
20k 10k 10
200k 100k 100
2M 1M 1k
20M 10M 10k
F.S. In R1 R2 Resolution
200mV omit omit 100µV
2V omit omit 1mV
20V 9M 1M 10mV
200V 10M 100k 100mV
1200V 10M 10k 1V
VOLTAGE RANGE CHANGE
CURRENT RANGE CHANGE (*)
Use 200mV F.S. meter for minimum voltage drop. OHMMETER RANGE CHANGE
Useful Tables
NOTE: Use of these application circuits is entirely at the risk and
responsibility of the user and any user modification of the meter may at
the discretion of Texmate, void the warranty. (See rear page for user's
responsibility and warranty details) The following legend applies to all
application circuits: 1) optional component positions are shown in dotted
lines; 2) internal solder junctions are shown by for a closed junction
or for an open junction; 3) calibration voltages as measured by an
external user supplied voltmeter are shown by
Typical Application Connections
The PM-35XAC may be used in a wide variety of configura-
tions. The following circuits illustrate some of the possibilities
and demonstrate the exceptional versatility of Texmate products.
Components called for in the applications which are not part of
the standard meter may be supplied by the user or in some cases
purchased from Texmate. The circuit diagrams explain the basic
pinout connections required for each application. Unless other-
wise specified, the diagrams will show the component values and
solder junctions that would normally be installed on a standard 2V
range meter. For those applications which have alternative rang-
es and/or input configurations, the required component values
and any modifications are described in the text.
BATTERY OPERATED 4 TO 20mA RECEIVER
1) Install 125Ω resistor in RS position; 2) Install R15 potentiometer using
any value between a minimum of 20kΩ and a maximum of 100kΩ.
Pic. A1
Optional Auto
Range Function

Texmate, Inc. Tel. [phone] • www.texmate.comPage 4 PM-35XAC Manual (X3)
Ordering Information
PM Case Dimensions and Panel Cutouts
Case Dimensions
TOP VIEW
FRONT VIEW
PANEL CUTOUT SIDE VIEW
16.82mm
0.662in
29.60mm
1.165in
14.50mm
0.571in
64.77mm
2.550 in
24.64mm
0.970in
69.90mm
2.752in
option metal
screw mounting clip
102.36mm
4.030in
84.50mm
3.330in
Edge connector
When extra panel mounting
tightness is required, optional
Screw Mounting Clips can be
purchased seperately and attach
to the sliding mounting side clips
8.50mm
0.335in
2.50mm
0.098in
Standard Options for this Model Number
4BASIC MODEL NUMBER
PM-35XAC110 3.5 digit LCD, 2VDC, 120VAC Power ...........
Special Options and Accessories
4SPECIAL OPTIONS (Specify Inputs & Req. Reading)
ZS..........Custom display scaling within standard ranges
ZR-1200V ....1200 VDC Range Change.
ZR-200V ....200 VDC Range Change.
ZR-20V ......20 VDC Range Change.
ZRS-200MV ..200 mVDC range change.
ZRS-PMRP...Non-standard range and scale - 3.5 digit.
PM-35XACAR1 . Autoranging Function std.200mV/2V
4ACCESSORIES
CN-S15......Dual Row 15 Pin Edge Connector, Solder Type
WARRANTY
Texmate warrants that its products are free from defects in material and workmanship under
normal use and service for a period of one year from date of shipment. Texmate’s obligations
under this warranty are limited to replacement or repair, at its option, at its factory, of any of
the products which shall, within the applicable period after shipment, be returned to Texmate’s
facility, transportation charges pre-paid, and which are, after examination, disclosed to the sat-
isfaction of Texmate to be thus defective. The warranty shall not apply to any equipment which
shall have been repaired or altered, except by Texmate, or which shall have been subjected
to misuse, negligence, or accident. In no case shall Texmate’s liability exceed the original pur-
chase price. The aforementioned provisions do not extend the original warranty period of any
product which has been either repaired or replaced by Texmate.
USER’S RESPONSIBILITY
We are pleased to offer suggestions on the use of our various products either by way of printed
matter or through direct contact with our sales/application engineering staff. However, since
we have no control over the use of our products once they are shipped, NO WARRANTY
WHETHER OF MERCHANTABILITY, FITNESS FOR PURPOSE, OR OTHERWISE is made
beyond the repair, replacement, or refund of purchase price at the sole discretion of Texmate.
Users shall determine the suitability of the product for the intended application before using,
and the users assume all risk and liability whatsoever in connection therewith, regardless
of any of our suggestions or statements as to application or construction. In no event shall
Texmate’s liability, in law or otherwise, be in excess of the purchase price of the product.
Texmate cannot assume responsibility for any circuitry described. No circuit patent or software
licenses are implied. Texmate reserves the right to change circuitry, operating software, speci-
fications, and prices without notice at any time.
1934 Kellogg Ave. Carlsbad, CA 92008
Tel: [phone] • USA 1-800-839-6283 • That’s 1-800-TEXMATE
• Email: [email protected] • [email protected]
• Web: www.texmate.com
PM-35XAC110 and PM-35XACAR1 Technical Manual Copyright © 2020
Texmate Inc. All rights reserved. Published by: Texmate Inc. USA. Infor-
mation in this Technical Manual is subject to change without notice due to
correction or enhancement. The information described in this manual is
proprietary to Texmate, Inc. and may not be copied, reproduced or transmit-
ted, in whole or in part, in connection with the design, manufacture, or sale
of apparatus, device or private label product without the express written
consent of Texmate, Inc.