PICO PT-104 User manual

Copyright 2005 Pico Technology Limited. All rights reserved.
PT-104
User Guide
PT104-2
Temperature Converter

Contents
.............................................................................................3
1 Introduction
...................................................................................................3
1 Overview
...................................................................................................4
2 Safety warning
...................................................................................................5
3 Legal information
.............................................................................................6
2 Product information
...................................................................................................6
1 Specifications
...................................................................................................6
2 Installing the driver
...................................................................................................7
3 Connection
...................................................................................................10
4 Background on PRTs
.............................................................................................12
3 Driver information
...................................................................................................12
1 Introduction
...................................................................................................13
2 pt104_open_unit
...................................................................................................13
3 pt104_close_unit
...................................................................................................13
4 pt104_poll_driver
...................................................................................................14
5 pt104_get_cycle
...................................................................................................15
6 pt104_set_channel
...................................................................................................15
7 pt104_set_mains
...................................................................................................16
8 pt104_get_value
...................................................................................................17
9 pt104_get_version
...................................................................................................17
10 pt104_get_unit_info
...................................................................................................17
11 pt104_get_driver_version
...................................................................................................18
12 pt104_labview
...................................................................................................18
13 Windows 95/98/ME/NT/2000/XP
...................................................................................................18
14 Linux
.............................................................................................19
4 Writing your own programs
...................................................................................................19
1 C / C++
...................................................................................................20
2 Delphi
...................................................................................................20
3 Excel
...................................................................................................20
4 LabVIEW
...................................................................................................21
5 Visual Basic
...................................................................................................21
6 Agilent-VEE
.............................................................................................22
5 Technical reference
...................................................................................................22
1 Serial port settings
...................................................................................................22
2 Serial port connections
...................................................................................................23
3 Protocol information
...................................................................................................25
4 Modem operation
...................................................................................................26
5 Lookup table
PT-104 Help
I
Copyright 2005 Pico Technology Limited. All rights reserved.
PT104-2

......................................................................................................31
Index
II
Contents
PT104-2
Copyright 2005 Pico Technology Limited. All rights reserved.

PT-104 Help
3
Copyright 2005 Pico Technology Limited. All rights reserved.PT104-2
1Introduction
1.1 Overview
The PT-104 is a four-channel, high-resolution temperature
converter for use with PT100 and PT1000 type sensors. It
can be used to measure temperature, resistance and
voltage.
In PT100/PT1000/resistance mode, the unit uses a four-
wire circuit.
In voltage mode, the input connector can be treated as a
differential input with ground, or two single-ended inputs.
Both inputs must be 0 V or above, though it does not
matter which input has the higher voltage. For the 115 mV
range, the accuracy may vary by 2%, and the temperature
coefficient will be 100 ppm/°C.

Introduction 4
Copyright 2005 Pico Technology Limited. All rights reserved. PT104-2
1.2 Safety warning
We strongly recommend that you read the general safety information below before
using your product for the first time. If the equipment is not used in the manner
specified, then the protection provided may be impaired. This could result in damage
to your computer and/or injury to yourself or others.
Maximum input range
The PT-104 is designed to measure voltages in the range 0 to +2.5 V. Any voltages in
excess of ±30 V may cause permanent damage to the unit.
Mains voltages
Pico products are not designed for use with mains voltages. To measure mains we
recommend the use of a differential isolating probe specifically designed for such
measurements.
Safety grounding
The ground of every product is connected directly to the ground of your computer via
the interconnecting cable provided. This is done in order to minimise interference. If
the PC (especially laptop) is not grounded, reading stability cannot be guaranteed and
it may be necessary to manually ground the equipment.
As with most oscilloscopes and data loggers, you should take care to avoid connecting
the inputs of the product to anything which may be at a hazardous voltage. If in
doubt, use a meter to check that there is no hazardous AC or DC voltage. Failure to
check may cause damage to the product and/or computer and could cause injury to
yourself or others.
Take great care when measuring temperatures near mains equipment. If a sensor is
accidentally connected to mains voltages, you risk damage to the converter or your
computer and your computer chassis may become live.
You should assume that the product does not have a protective safety earth. Incorrect
configuration or use of the device to measure voltages outside the maximum input
range can be hazardous.
Repairs
The unit contains no user-serviceable parts. Repair or calibration of the unit requires
specialised test equipment and must be performed by Pico Technology Limited or their
authorised distributors.

PT-104 Help
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Copyright 2005 Pico Technology Limited. All rights reserved.PT104-2
1.3 Legal information
The material contained in this release is licensed, not sold. Pico Technology Limited
grants a licence to the person who installs this software, subject to the conditions
listed below.
Access
The licensee agrees to allow access to this software only to persons who have been
informed of these conditions and agree to abide by them.
Usage
The software in this release is for use only with Pico products or with data collected
using Pico products.
Copyright
Pico Technology Limited claims the copyright of, and retains the rights to, all material
(software, documents etc.) contained in this release. You may copy and distribute the
entire release in its original state, but must not copy individual items within the
release other than for backup purposes.
Liability
Pico Technology and its agents shall not be liable for any loss, damage or injury,
howsoever caused, related to the use of Pico Technology equipment or software,
unless excluded by statute.
Fitness for purpose
No two applications are the same: Pico Technology cannot guarantee that its
equipment or software is suitable for a given application. It is your responsibility,
therefore, to ensure that the product is suitable for your application.
Mission-critical applications
This software is intended for use on a computer that may be running other software
products. For this reason, one of the conditions of the license is that it excludes usage
in mission-critical applications, for example life support systems.
Viruses
This software was continuously monitored for viruses during production. However, you
are responsible for virus-checking the software once it is installed.
Support
If you are dissatisfied with the performance of this software, please contact our
technical support staff, who will try to fix the problem within a reasonable time scale.
If you are still dissatisfied, please return the product and software to your supplier
within 14 days of purchase for a full refund.
Upgrades
We provide upgrades, free of charge, from our web site at
www.picotech.com
. We
reserve the right to charge for updates or replacements sent out on physical media.
Trademarks
Pico Technology Limited, PicoScope, PicoLog, DrDAQ and EnviroMon are trademarks of
Pico Technology Limited, registered in the United Kingdom and other countries.
Pico Technology acknowledges the following product names as trademarks of their
respective owners: Windows, Excel, Visual Basic, LabVIEW, Agilent VEE, Delphi.

Product information 6
Copyright 2005 Pico Technology Limited. All rights reserved. PT104-2
2Product information
2.1 Specifications
Temperature
Resistance
Voltage
Sensor
PT100*, PT1000
N/A
N/A
Range
-200 to 800°C
0 to 375
W
*;
0 to 10k
W
0 to 115
mV;
0 to 2.5
V*
Linearity
10 ppm
10 ppm
10 ppm
Accuracy @25°C
0.01°C*
20 ppm*
0.2%*
Temperature
coefficient
3 ppm/°C
3 ppm/°C
100
ppm/°C
RMS Noise
(using filter)
0.01°C
10 ppm
10 ppm
Resolution
0.001°C
1
mW
0.156
m
V
Conversion Time Per
Channel
720 ms**
720 ms**
180 ms
Number of inputs
4
Connectors
4-pin mini-DIN
Input impedance
>>1M
W
Overvoltage
protection
±30 V
Output
RS232, DE9 female
Environmental
20 to 30°C for stated accuracy; 0 to 70°C overall; 20 to 90%
RH
Software
PicoLog data logging software; Drivers for Windows
95/98/NT/2000/ME; Examples for C/C++, Delphi, Excel,
LabVIEW, Visual Basic, Agilent-VEE.
Quoted accuracy is for options marked *
For four-wire temperature and resistance measurement**
2.2 Installing the driver
The driver is installed automatically when you install the PicoLog software.
Alternatively, you can download the driver from our website at
http://www.picotech.com
.

PT-104 Help
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Copyright 2005 Pico Technology Limited. All rights reserved.PT104-2
2.3 Connection
To use the PT-104, you should connect its D-connector to your computer's serial port
using the cable provided. Next, connect a PT100 or PT1000 PRT to one of the input
connectors.
Pin Connections to the PT-104 Mini-DIN socket
Pin
PT100, PT1000
4 Wire
PT100, PT1000
3 Wire
PT100, PT1000
2 Wire
Differential voltage
1
White
Connect to pin 3
Connect to pin 3
Do not connect
2
Red
Red
Red
V -
3
White
White
White
V +
4
Red
Red
Connect to pin 2
Gnd
Single-ended voltage connection
Connector
Channel
Pin
1
1
3
5
2
2
2
3
6
2
3
3
3
7
2
4
4
3
8
2
Note on Differential Voltage Mode:
The maximum input voltage range of the PT-104 is 2.5 V. Any voltage in excess of +/-
30 V on any input pin may cause permanent damage to the unit.
In Differential Voltage Mode, the input connector should be treated as a differential
input with reference to ground. Both inputs (V+ and V-) must be zero volts or above
(it does not matter which input has the higher voltage) and must remain within the
input range. A ground reference connection is also required for correct operation. The
ground connection of each MiniDIN socket consists of a 100
W
resistor to mains
earth/ground via the serial cable outer braiding and the PC chassis.

Product information 8
Copyright 2005 Pico Technology Limited. All rights reserved. PT104-2
Setting up
To set up the unit, do the following:
1.
From the PicoLog Recorder
File
menu, select
New settings.
The
Recording
dialog box appears:
2.
Click
OK
.
The
Sampling Rate
dialog box appears:
3.
Click
OK
.
The
Converter details
dialog box appears:
4.
From the
Converter type
drop-down list, select
PT-104

PT-104 Help
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Copyright 2005 Pico Technology Limited. All rights reserved.PT104-2
5.
From the
Port
drop-down list, select the port and click
OK
.
After a short while, the
PT-104 channels
window appears:
6.
In the
PT-104 channels
window, double-click on
Ch1 unused
.
The
Edit PT-104 Channel
dialog box appears:
7.
Type in a name for the channel, if required
8.
Select the data type required i.e temperature, resistance or voltage
9.
Select circuit - for PT100 and PT1000
10.
Now click
OK
.
Readings from the PT-104 should appear in the monitor window: