Keithley 195T Digital multimeter
Manufacturer:
Model:
195T
Date:
1983
Category:
Group:
Description:
System Temperature DMM

Information

The Model 195T is an enhanced version of the model 195 that includes temperature measuring capabilities. The Model 195T is capable of temperature measurements in the range of -220°C and + 630°C and between -360°F and +1100°F. The instrument is designed to work with platinum RTD probes, a factor which contributes to high accuracy. Temperature readings may be read directly from the front panel display or transmitted over the IEEE bus to a central controller or other instrumentation. Some key Model 195T features include: 1. High Accuracy. Because platinum RTD probes have predictable resistance change with temperature and are highly linear, temperature measurements are made with a greater degree of accuracy than is possible with thermistor or thermocouple type probes. 2. Ease of Use. The temperature measuring mode is easily entered from the front panel or over the IEEE bus. Sophisticated Software automatically measures the Probe resistance and calculates the reading. 3. Dual Scale Temperature Measurements. Temperature readout may be obtained in either °C or °F. Readings are available on the display and over the IEEE bus. 4. Front Panel Calibration. Temperature calibration may be performed from the front panel. Probe errors can be minimized with the calibration procedure. 5. Four Wire Resistance Measurements. Resistance measurements with the supplied Probe are performed using the 4-wire method to minimize the effects of lead resistance. 6. Selectable 3-wire or 4-wire Operation. The instrument may be used with either 3-wire or 4-wire probes; the mode of operation is easily changed from the front panel.

show more

Service and User Manual
Manual type:
Service and User Manual
Pages:
25
Size:
1.06 Mbytes (1111399 Bytes)
Language:
english
Revision:
Manual ID:
195-901-01A
Date:
1983 02 01
Quality:
Scanned document, all readable.
Upload date:
2020 07 23
MD5:
9c3317562c12258eef10d1ff88a39333
Downloads:
277

Information

Instruction Manual Supplement SECTION 1 GENERAL INFORMATION 1.1 Introduction ... 1-1 1.2 Model 195T Features ... 1-1 1.3 Warranty Information ... 1-1 1.4 Manual Addenda ... 1-1 1.5 Safety Terms and Symbols ... 1-1 1.6 Specifications ... 1-1 1.7 Unpacking and Inspection ... 1-1 1.8 Scope of Model 195T Instruction Manual ... 1-1 1.9 Accessories ... 1-2 1.9.1 Model 195T Input Adapter Box ... 1-2 1.9.2 Model 8691 Connector Kit ... 1-2 1.9.3 Model 8693 General Purpose Immersion Probe ... 1-2 1.9.4 Model 8695 Surface Probe ... 1-2 1.9.5 Model 8696 Air/Gas Probe ... 1-2 SECTION 2 OPERATION 2.1 Introduction ... 2-1 2.2 Probe Connection ... 2-1 2.3 Temperature Measurement Procedure ... 2-1 2.4 IEEE Bus Control of Temperature Measurements ... 2-2 2.4.1 IEEE Temperature Commands ... 2-2 2.4.2 IEEE Bus Temperature Data Format ... 2-2 2.5 3-Wire Sensor Operation ... 2-3 2.6 Calibration Standards ... 2-3 SECTION 3 PERFORMANCE VERIFICATION 3.1 Introduction ... 3-1 3.2 Environmental Conditions ... 3-1 3.3 Recommended Equipment ... 3-1 3.4 Initial Conditions ... 3-1 3.5 Verification Procedure ... 3-1 SECTION 4 THEORY OF OPERATION 4.1 Introduction ... 4-1 4.2 RTD Resistance Measurement ... 4-1 4.3 FET Switching Sequence ... 4-1 4.4 Reading Calculations ... 4-1 SECTION 5 SERVICING INFORMATION 5.1 Introduction ... 5-1 5.2 Calibration ... 5-1 5.2.1 Environmental Conditions ... 5-1 5.2.2 Warm-Up Period ... 5-1 5.2.3 Calibration Constants ... 5-1 5.2.4 Front Panel Calibration Procedure ... 5-1 5.2.5 Temperature Calibration Over the IEEE-488 Bus ... 5-2 5.3 Replaceable Parts ... 5-2 5.3.1 Ordering Information ... 5-2 5.3.2 Parts List ... 5-3 5.4 Troubleshooting Information ... 5-3 5.5 Component Layouts and Schematics ... 5-3 2-1 Model 195T Front Panel Showing Model 1951 Input Adapter Box ... 2-1 2-2 Model 195T Probe Wiring ... 2-1 2-3 3-Wire Sensor Connections ... 2-3 3-1 Connections for Performance Verification ... 3-1 4-1 Simplified Circuit of RTD Resistance Measurement ... 4-1 4-2 FET Switching Sequence ... 4-1 4-3 FET Switching Sequence for RTD Resistance Measurements ... 4-2 5-1 Remote Box, Schematic Diagram, Drawing Number 1951-106 ... 5-4 5-2 Mother Board, Component Layout, Drawing Number 195T-100 ... 5-5 5-3 Mother Board, Schematic Diagram, Drawing Number 195T-106 ... 5-9

show more