Ectron Model 1100 Thermocouple Simulator Calibrator w/ 4 TC Types, 115V - 1100CF

Description

Ectron Model 1100 Thermocouple Simulator Calibrator w/ 4 TC Types, 115V - 1100CF
Simplifies precise calibration of thermocouple measuring instruments
Includes linear DC calibration capability
Made in USA
Calibration of Thermocouple Applications
Temperature Indicators
Data Systems
Temperature Transmitters
Amplifiers and Linearizers
Temperature Controllers Thermocouples (requires bath)
Calibration of Linear Applications
DC Digital Voltmeters
Panel Meters
Strip Chart Recorders
Millivoltmeters
VCO's and Amplifiers
DC Power Supplies
Features
Simulates 4 TC types
Dial Temperature in Degrees
Digital Conformity to NIST 0.1°
Self-Contained Ref. Junction
Dial Millivolts Directly
0.01% of Reading Accuracy Optional Remote Programming
GENERAL DESCRIPTION
The Model 1100 is a sophisticated and versatile instrument which has been designed both to generate and to measure precise voltages. It is equally useful on the production line and in the laboratory. Although its most frequent application is to calibrate temperature indicating devices such as digital thermometers, thermocouple recorders, etc., it actually functions in four separate and distinct ways. A. As a Thermocouple Simulator. In this mode the built-in computing capability and memory enable the operator to simply select a thermocouple type, dial a temperature in °C or °F and automatically obtain the proper output volt-age for the selected thermocouple type on terminals made of the proper thermocouple material. B. As a thermocouple calibrator (Differential Temperature Measurement). C. As a linear dc voltage standard (DC Voltage Calibrator). D. As a linear DC Differential Voltmeter. The Model 1100 may be remotely programmed in any of the above modes of operation, making it especially useful when calibrating large numbers of instruments or on the production line. Details of the operating modes and remote programming capability are given below.
A. THERMOCOUPLE SIMULATOR MODE
In this mode, the instrument simulates a thermocouple that can be set to any temperature by front panel switches (or remote control lines). The output corresponds very closely to the tables in NIST Monograph 175.while delivering up to 5mA of current into an external load. (See Digital Confor-mity in Table 2.) The output is available on terminals con-structed of thermocouple material. Alternatively, the output is available on copper terminals with a selectable reference junction temperature.
The Model 1100 simulates thermocouple types E (Chrome• Constantan), J (Iron Constantan), K (Chromel* Alumel• ) and T (Copper Constantan). This simulation covers the entire temperature range given for each of these tyoes in NIST Monograph 175. The instrument may simulate temperatures in degrees Celsius (Centigrade) or Fahren-heit, or both, depending on the options selected. In either case the temperature may be set to within 0.1 degree by adjusting five lever switches. The integral switch readouts indicate the temperature directly.
Figure 1 is a simplified block diagram of the Model 1100 applicable to all four modes of operation. It shows that the instrument is fundamentally a precision dc voltage source, consisting of a stable dc reference and a digital-to-analog converter (DAC). Changing the input commands to the DAC and/or the routing of the analog voltage determines which of the four modes the instrument will operate in. In the thermocouple simulator mode the operation is as follows: 1. The operator selects the thermocouple type, Scale (C or F) and desired temperature. 2. The output of the switches addresses the arithmetic unit which in turn interrogates the appropriate ROM. 3. The ROM, programmed with information from NBS ther-mocouple tables, responds with an appropriate digital number which commands the DAC. 4. The DAC produces the appropriate millivolt output. 5. The operator sets the Reference Junction Temperature Switch and selects copper or thermocouple-material out-put terminals as required by the device to be calibrated.
B. DIFFERENTIAL TEMPERATURE MEASUREMENT MODE
This mode is used to measure the temperature of thermo-couples to a high degree of accuracy. The instrument func-tions in the same manner as in the Thermocouple Simulator Mode, except that it is used as a measuring device rather than as a voltage source. The output from the thermocouple to be measured is compared with the voltage generated by the Model 1100. When these voltages are equal, the temper-ature of the external thermocouple is equal to the tempera-ture indicated by the readouts of the lever switches. A sensitive amplifier and null-meter are permanently connected internally between the negative output terminals (SOURCE) and the input terminals ( METER) on the panel labeled THERMOCOUPLE. The thermocouple to be measured is connected between one of the "common" ter-minals and a METER terminal. (See front page photo and Figs. 1 and 2.) The lever switches are adjusted for a zero reading on the null-meter and the temperature is then read directly from the switches. Calibration of a thermocouple can be accomplished by immersing the thermocouple in a suitable bath and adjust-ing for a null as described above. In this way, a calibration point can be established for the particular thermocouple at the temperature of the bath.
C. DC VOLTAGE CALIBRATOR
Since the Model 1100 is fundamentally a variable precision dc source, it can operate in a linear mode as a dc voltage calibrator. The excellent stability (±0.005% tl pV for 6 months) and the high resolution (1 pV on the lowest range) make it ideal for calibrating digital voltmeters, recorders, and other precision dc equipment In this mode, the lever switch which selects °C or °F is moved to one of three ranges: MV, MV x 0.1 or MV x 0.01. These positions provide full-scale ranges of 10V, 1V and 100mV respectively. In the MV positions the arithmetic por-tion of the instrument is bypassed and the DAC is controlled directly by the decade lever switches. The precise output voltage desired is present on copper terminals at the bind-ing post pair labeled COPPER SOURCE.
D. DC DIFFERENTIAL VOLTMETER MODE
The incorporation of a nullmeter in the Model 1100 adds considerably to its versatility by permitting it to operate as a dc differential voltmeter. In this linear mode of operation the instrument again functions as a measuring device rather than a voltage source with the capability of measuring dc voltages to an accuracy of 0.015% ± 1pV. The external volt-age is connected to the binding posts labeled METER IN-PUT (See cover photo and Fig. 2), the appropriate MV scale is chosen and the lever switches are adjusted for zero indi-cation on the nullmeter. The precise value of the external voltage is then given by the readouts of the lever switches.
INPUT/OUTPUT TERMINAL ARRANGEMENT
The versatility of the Model 1100 is enhanced considerably by the use of input and output terminals made of several dif-ferent thermocouple materials as well as copper. The panel labeled THERMOCOUPLE contains terminals made of cop-per, iron, constantan, alumel and chrome! as shown on the cover photo. These are arranged so that terminal pairs selected from the center ("common" terminals) and from the side labeled SOURCE provide output voltages from E, J, K or T thermocouple material, while pairs selected from the center and the side labeled METER provide input terminals for voltage from external thermocouples of the same four types. In addition to this terminal panel there are copper ter-minal pairs in the form of bindng posts. The pair labeled COPPER SOURCE is used as voltage output terminals, and the pair labeled METER INPUT is used as voltage input ter-minals from an external source. The choice of terminal material and the choice of inter-nal reference junction temperature permit operation with the internal or an external reference junction, with instru-ments which are separated from their reference junctions, etc.
REMOTE PROGRAMMING, OPTION A
Figure 1 shows that the temperature or voltage setting can be selected by either the front panel switches or remote digital logic. The remote programming capability is added by specifying Option A. This includes the plug-in isolator mod-ule and the digital multiplexing circuitry which selects the local or remote control lines. In the remote mode, the exter-nal system can control selection of +, °C, °F, MV, MV X0.1, MV X0.01 plus a five digit temperature or voltage. All other controls are set manually. The remote control option electrically isolates the exter-nal logic lines from the internal circuitry to minimize ground loops and resulting line-related noise. The digital input interface is TTL compatible. Since the input buffers are elec-trically isolated from the 1100, the external system must supply 5V dc power at 300mA to these buffers.
SUMMARY OF CAPABILITIES
The ability to accurately simulate a thermocouple with con-trols which read directly in degrees is the most unique feature of the Model 1100. This eliminates the need for per-forming calibrations with a collection of three or four pieces of laboratory equipment and most important, it eliminates the need for constant referral to thermocouple tables. The use of thermocouple tables is tedious, time consum-ing and costly. It can also lead to calibration errors and the "short cutting" of test procedures. To illustrate the latter, consider the testing and calibration of a digital thermo-couple indicator which has internal linearization consisting of 30 to 50 individual segments. This instrument should not be certified until all segments have been fully tested, prefer-ably at several points. This type of comprehensive testing can take hours if each reading must be looked up in a five or six-place table. The excessive time required can easily lead to the omission of important test steps. The addition of differential and linear modes of opera-tion together with its remote programming capability make the 1100 one of the most versatile and useful precision in-struments available today.
Condition:
AS IS government surplus item.
Picked up from laboratory environment.
Photos represent the exact item that will be shipped. Please refer the photos.
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