Hart Scientific 1502A Manual de usuario

Model 1502A

Thermometer

User Manual

Rev. 952801

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 - TestEquipmentDepot.com

WARNING

To ensure the safety of operating personnel, and to avoid damage to this equipment:

DO NOT operate this unit without a properly grounded, properly polarized power cord.

DO NOT connect this unit to a non-grounded, non-polarized outlet.

DO USE a ground fault interrupt device.

WARNING

To ensure the safety of personnel, and to avoid damage to this equipment:

DO NOT use this unit in environments other than those listed in the user’s manual.

Follow all safety guidelines listed in the user’s manual.

WARNING

CALIBRATION EQUIPMENT SHOULD ONLY BE USED BY TRAINED PERSONNEL.

Table of Contents

1 Introduction. . . . . . . . . . . . . . . . . . . . . . 1

2 Specifications and Environmental Conditions . . . 3

2.1 Specifications . . . . . . . . . . . . . . . . . . . . . . . 3

2.2 Environmental Conditions . . . . . . . . . . . . . . . . 4

2.3 Warranty . . . . . . . . . . . . . . . . . . . . . . . . . 4

3 Safety Guidelines . . . . . . . . . . . . . . . . . . 7

4 Quick Start . . . . . . . . . . . . . . . . . . . . . . 9

4.1 Unpacking . . . . . . . . . . . . . . . . . . . . . . . . 9

4.2 Power . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

4.3 Connecting the Probe. . . . . . . . . . . . . . . . . . . 9

4.4 DC Power Option . . . . . . . . . . . . . . . . . . . . 10

5 Parts and Controls . . . . . . . . . . . . . . . . . 13

5.1 Front Panel Buttons . . . . . . . . . . . . . . . . . . . 13

5.2 Rear Panel . . . . . . . . . . . . . . . . . . . . . . . 14

6 General Operation . . . . . . . . . . . . . . . . . 15

6.1 Selecting Units . . . . . . . . . . . . . . . . . . . . . 15

6.2 Parameter Menus . . . . . . . . . . . . . . . . . . . . 15

6.3 Menu Lockout . . . . . . . . . . . . . . . . . . . . . . 15

6.4 Selecting the Probe Characterization . . . . . . . . . . 17

6.4.1 Setting the Probe Characterization Type . . . . . . . . . . . . 17

6.4.2 Setting the Characterization Coefficients . . . . . . . . . . . . 17

6.4.3 ITS-90 PRT and Coefficients . . . . . . . . . . . . . . . . . . 18

6.4.4 Callendar-Van Dusen (RTD) Conversion . . . . . . . . . . . . 20

6.4.5 IPTS-68 Conversion . . . . . . . . . . . . . . . . . . . . . . 20

6.4.5.1 Setting the Characterization Coefficients . . . . . . 21

6.4.5.2 Testing the Coefficients . . . . . . . . . . . . . . . 21

6.5 Filtering . . . . . . . . . . . . . . . . . . . . . . . . . 21

6.6 Setting the Current . . . . . . . . . . . . . . . . . . . 22

6.7 Power Saver. . . . . . . . . . . . . . . . . . . . . . . 22

7 Digital Communications Interface . . . . . . . . . 23

7.1 Serial Interface . . . . . . . . . . . . . . . . . . . . . 23

7.1.1 Setting the Baud Rate. . . . . . . . . . . . . . . . . . . . . . 24

7.1.2 Automatic Transmission of Measurements . . . . . . . . . . . 24

7.1.3 Time Stamp and System Clock . . . . . . . . . . . . . . . . . 24

7.1.4 Duplex Mode and Linefeed . . . . . . . . . . . . . . . . . . . 25

7.2 GPIB Interface. . . . . . . . . . . . . . . . . . . . . . 25

7.2.1 Setting the Address . . . . . . . . . . . . . . . . . . . . . . . 26

7.2.2 Setting the Termination Character . . . . . . . . . . . . . . . 26

7.2.3 Time Stamp . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

7.3 Remote Commands . . . . . . . . . . . . . . . . . . . 26

7.3.1 Measurement Commands . . . . . . . . . . . . . . . . . . . 26

7.3.1.1 Reading Temperature . . . . . . . . . . . . . . . . 28

7.3.1.2 Automatically Transmitting Measurements. . . . . . 29

7.3.1.3 Selecting the Unit of Measurement . . . . . . . . . 29

7.3.1.4 Enabling the Time Stamp . . . . . . . . . . . . . . 29

7.3.1.5 Setting the Clock . . . . . . . . . . . . . . . . . . . 29

7.3.2 Probe Characterization Commands. . . . . . . . . . . . . . . 29

7.3.2.1 Selecting the Characterization . . . . . . . . . . . . 29

7.3.2.2 Testing the Characterization . . . . . . . . . . . . . 30

7.3.3 Sample Commands . . . . . . . . . . . . . . . . . . . . . . . 30

7.3.3.1 Setting the Filter . . . . . . . . . . . . . . . . . . . 30

7.3.3.2 Setting the Probe Current . . . . . . . . . . . . . . 30

7.3.3.3 Setting the Power Saver . . . . . . . . . . . . . . . 31

7.3.4 Communication Commands . . . . . . . . . . . . . . . . . . 31

7.3.4.1 Setting the Duplex Mode . . . . . . . . . . . . . . . 31

7.3.4.2 Setting the Linefeed Option . . . . . . . . . . . . . 31

7.3.5 Calibration Commands . . . . . . . . . . . . . . . . . . . . . 31

7.3.5.1 Entering the Password . . . . . . . . . . . . . . . . 31

7.3.5.2 Setting the Menu Lockout . . . . . . . . . . . . . . 31

7.3.5.3 Setting the Calibration Coefficients . . . . . . . . . 32

7.3.5.4 Setting the Serial Number . . . . . . . . . . . . . . 32

7.3.6 Other Commands . . . . . . . . . . . . . . . . . . . . . . . . 32

7.3.6.1 Instrument Identification . . . . . . . . . . . . . . . 32

7.3.6.2 Reading a List of Commands . . . . . . . . . . . . 32

8 Calibration Procedure . . . . . . . . . . . . . . . 33

8.1 Accessing the Calibration Parameters . . . . . . . . . 33

8.2 Calibration Procedure . . . . . . . . . . . . . . . . . . 34

9 Maintenance . . . . . . . . . . . . . . . . . . . . 35

10 Troubleshooting . . . . . . . . . . . . . . . . . . 37

iii

Figures and Tables

Figure 1 Connecting a four-wire probe . . . . . . . . . . . . . . . . 10

Figure 2 12 V DC power source polarity . . . . . . . . . . . . . . . 11

Figure 3 1502A Front Panel . . . . . . . . . . . . . . . . . . . . . 13

Figure 4 1502A Back Panel . . . . . . . . . . . . . . . . . . . . . 14

Figure 5 Parameter Menu Structure . . . . . . . . . . . . . . . . . 16

Table 1 Matching Certificate Values to 1502A ITS-90 Coefficients . 18

Table 2 Setting Coefficients Rtpw, a5, and b5. . . . . . . . . . . . 19

Table 3 Setting Coefficients Rtpw, a8, b8, a4, and b4. . . . . . . . 19

Table 4 Setting Coefficients R(273.16), a6, b6, c6, and d . . . . . . 20

Figure 6 Serial Cable Wiring . . . . . . . . . . . . . . . . . . . . . 23

Table 5 Command List. . . . . . . . . . . . . . . . . . . . . . . . 27

Table 5 Command List Continued . . . . . . . . . . . . . . . . . . 28

1 Introduction

The Hart Model 1502A is a low-cost high-accuracy digital thermometer readout

designed to be used with 25Ωand 100ΩRTDs and SPRTs. Its unique combi-

nation of features makes it suitable for a wide variety of applications from labo-

ratory measurement to industrial processes. Features of the 1502A include:

•Measures 25Ωand 100ΩRTDs and SPRTs

•Four-wire connection eliminates lead resistance effects

•Accuracy: 0.006°C at 0°C

•Resolution: 0.001°C

•Fast one-second measurement cycle

•Adjustable digital filter

•Accepts ITS-90 characterization coefficients

•Also accepts Callendar-Van Dusen and IPTS-68 coefficients

•Adjustable excitation current

•Displays temperature in Celsius, Fahrenheit, or Kelvin or displays resis-

tance in ohms

•Password protection of critical parameters

•Large, bright eight-digit LED display

•Serial RS-232 interface standard; IEEE-488 GPIB interface optional

•Detachable power cord

•Optional 12 V DC power

•Light weight, small and portable

•Sturdy, reliable construction

1502A Manual Rev. 952801 1

1 Introduction

2 Specifications and Environmental

Conditions

2.1 Specifications

Specifications

Resistance Range 0Ωto 400Ω, auto-ranging

Resistance Accuracy, one

year1

0Ωto 20Ω: 0.0005Ω

20Ωto 400Ω: 0.0025% (25 ppm) of reading

Resistance Accuracy, short

term1, 2

0Ωto 30Ω: 0.0005Ω

30Ωto 400Ω: 0.0015% (15 ppm) of reading

Temperature Range3–200°C to 962°C (–328°F to 1764°F)

Temperature Accuracy1, 3, 4 –100°C: 0.004°C

0°C: 0.006°C

100°C: 0.009°C

200°C: 0.012°C

300°C: 0.015°C

400°C: 0.018°C

500°C: 0.021°C

600°C: 0.024°C

Temperature Coefficient of

Resistance1

1 ppm/°C

Resistance Resolution 0Ωto 20Ω: 0.0001Ω

20Ωto 400Ω: 0.001Ω

Temperature Resolution 0.001°C

Probe Nominal R(0.01°C): 25Ωto 100Ω

RTD, PRT, or SPRT

Probe Connection 4-wire with shield, 5-pin DIN connector

Maximum acceptable lead re-

sistance

100Ω

Probe Characterizations ITS-90 sub-ranges 4, 6, 7, 8, 9, 10, and 11

IPTS-68: R0,α,δ, a4, and c4

Callendar-Van Dusen: R0,α, δ, and β

Probe Excitation Current 0.5 and 1 mA , reverses every 0.25 seconds

Measurement Period 1 second

Digital Filter Exponential, 0 to 60 seconds time constant (user-selectable)

Communications RS-232 serial standard

IEEE-488 (GPIB) optional, conforms to IEEE-488.1, capability

AH1, SH1, T6, L4, DC1

Display 8-digit, 7-segment, yellow-green LED; 0.5 inch high characters

Clock accuracy, typical 0.01%

Operating Temperature

Range

Full accuracy: 16°C to 30°C

Absolute: 0°C to 55°C

AC power 115 VAC ±10%, 50/60 Hz, 10 VA, nominal

230 VAC ±10%, 50/60 Hz, 10 VA (optional)

Detachable power cord

DC power (optional) 10 to 14 VDC, 1 A maximum

(220 mA typical, normal mode; 120 mA typical, power saver

mode)

Size 5.6 inches (14.3 cm) wide x 7.1 inches (18.1 cm) deep x 2.4

inches (6.1 cm) high

Weight 2.2 lb. (1.0 kg)

1502A Manual Rev. 952801 3

2 Specifications and Environmental Conditions

1Accuracy specifications apply within the recommended operating temperature range. Accuracy

limits are increased by a factor of the temperature coefficient outside this range.

2Short-term accuracy includes nonlinearity and noise uncertainties. It does not include drift or cal-

ibration uncertainties.

3The temperature range may be limited by the sensor.

4Temperature accuracy is for the 1502A only. It does not include probe uncertainty or probe char-

acterization errors.

2.2 Environmental Conditions

Although the instrument has been designed for optimum durability and trou-

ble-free operation, it must be handled with care. The instrument should not be

operated in an excessively dusty or dirty environment. Maintenance and clean-

ing recommendations can be found in the Maintenance Section of this manual.

The instrument operates safely under the following conditions:

•temperature range: Absolute 0–55°C (32–131°F); Recommended

16–30°C (61–86°F)

•ambient relative humidity: 15–50%

•pressure: 75kPa–106kPa

•mains voltage within ±10% of nominal

•vibrations in the calibration environment should be minimized

•altitude does not effect the performance or safety of the unit

4 Manual Rev. 952801 Hart Scientific

2 Specifications and Environmental Conditions

1502A Manual Rev. 952801 5

2 Specifications and Environmental Conditions

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