Texmate PM-35U Manual

3 1/2 DIGIT with 0.3" LCD
General Features
The PM-35U Digital Panel Meter is an economical, high perfor-
mance instrument incorporating a number of fea tures usually
found only on more expensive meters. Utilizing the dual slope
method of integration, the unit measures differential and sin-
gle-ended DC voltages over five user selectable ranges from
199.9mV to 1200V full scale.
Maximum res o lu tion is 100µV over ±1999 counts. Provision is
made for user con nec tions to provide various operating modes,
including a ra ti om et ric voltmeter, current meter, ratiometric ohm-
meter, and a tem pera ture difference meter.
The true differential input capability of the Model PM-35U is par-
ticularly useful for making accurate measurements of very small
signals in the presence of much larger common mode signals.
Because of its high noise immunity, it is also ideal for measuring
various balanced transducers and bridge inputs. When measur-
ing bridge circuits, long term drift of the excitation voltage can
be compensated for by using the ratiometric voltmeter mode of
operation.
Typical Application Connections
SINGLE-ENDED METER- 200mV Range, >2V Range 200mV Range:
1) Change R6 from 470k to 47k, ±5%; 2) Change R9 from 18.2k to
26.7k, ±1%; 3) Remove R8 (9.53k) and short with a jumper; 4) It is rec-
om mend ed that C4, C5 and C7 be changed to 0.22mF; 5) Adjust R10
until CV1=100mV.
>2V Range: Install R1 and R2 as specified under section titled Useful
Tables.
+
H
7
Vin > 2V
+
F
R1
6
Vin < 2V
R2
- J
9.53k
8
E
-
View more application connections and connection
instructions on page 3.
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 .................... Replaced by SM-35X 3.5 digit LCD, Low Power Consumption
2VDC, 5VDC Power
PM-35U Manual (P1)
+
L
C4
10
C6
R6 5VDC
470k
K -
R8
R10 R9
2k 18.2k
9
+5V
J1
D
4
Cv1
+
Texmate, Inc. Tel. (760) 598-9899 • www.texmate.com
PM-Series
Standard Range 2V
4 Optional DC Input Ranges
from 200mV to 1200V
A Low Cost Easy To Use General Purpose Meter
Specifications
Input Configuration: ......True differential and single-ended
Full Scale Ranges: ........±199.9mVDC
Input Impedance: ...........Exceeds 1000MΩ on 200mV and
Input Protection: ............±250VDC or 175VAC maximum on
Accuracy: .......................±(0.1% of reading + 1 digit)
Temperature Coefficient: ..5PPM/°C in ratiometric operation; 80
Warm Up Time: ..............2 minutes to specified accuracy
Conversion Rate: ...........3 readings per second nominal
Display:...........................0.3" LED
Decimal Selection: ........User programmable to 4 positions
Overrange Indication: ...When input exceeds full scale on
Power Requirements: ...+4.5 to +5.5VDC at 200mA max.
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)
Weight: .............................88 gms (3.1 oz)
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
PM-35U
±1.999VDC (standard)
±19.99VDC
±199.9VDC
±1200VDC
2V ranges; 10MΩ on all other
ranges
200mV and 2V ranges; ±1200VDC
or 850VAC on all other ranges
to 100PPM/°C using internal
reference on 200mV and 2V ranges
any range being used, most
significant "1" digit & polarity symbol
are displayed with all other digits
blank
Depth behind Bezel 3.32"(84mm)
plus 0.68" (17.27mm) for connector.
Page 1