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Temperature Monitor
The SR630 is a 16-channel thermocouple monitor designed to read,
scan, print and log temperatures or voltages. You can use any one
of seven standard thermocouple types to read temperatures from -200
°C to +1700 °C. For remote monitoring applications, the
SR630 can time-stamp and store up to 2000 readings in non-volatile
memory for later analysis.
Temperature readings from the SR630 can be viewed on the front
panel or queried via the instrument's standard RS-232 or GPIB interfaces.
In addition, the standard Centronics printer port provides convenient
hardcopy output in either tabular or strip-chart format.
Voltage Monitor
The SR630 can also be configured as a 16-channel DC voltmeter with
full-scale ranges from 30 mV to 100 V (1 mV resolution). As a voltmeter,
the unit has 0.05 % accuracy and 1 µV input offset drift.
Each channel can be set independently to monitor either temperature
or voltage, giving the SR630 even more flexibility in your application.
Four rear-panel outputs are also available to provide a voltage
proportional to the temperature of the first four input channels.
The voltage outputs can be used to drive recorders or to control
external instrumentation.
Inputs
Sixteen screw-terminal inputs are mounted on a rear-panel isothermal
block for cold junction compensation. The isolated differential
inputs have a 250 V breakdown level, allowing the SR630 to tackle
difficult applications such as temperature profiling of electrically
live equipment. Each of the 16 channels may be independently set
to display in units of °C, °F, K, mV or V. Similarly, thermocouple
type, nominal temperature, temperature limit, and alarms may be
uniquely set for each channel, providing complete flexibility in
the configuration of the instrument. Access to any channel parameter
is provided through the front panel or via the computer interfaces.
The SR630 can store up to nine entire instrument configurations
including thermocouple type and temperature limits for all 16 channels.
Outputs
There are four analog outputs that are proportional to the readings
on channels one through four. Both the slope (m) and offset (b)
of the equation, Vout = ±mX + b, are changed by setting the
nominal temperature and chart span for the corresponding channel.
X is either temperature or voltage, depending on the setting for
each channel.
You may use the analog outputs to drive chart recorders or they
can provide a feedback signal for proportional temperature control
systems. They may also be used as fixed-level, analog control signals
(set via the computer interfaces).
Alarms
Each channel can be programmed individually with an upper and lower
temperature limit. An audio alarm and a relay closure indicate when
any channel exceeds its preset temperature or voltage limits. The
front-panel LED display will indicate which channel has exceeded
its limit.
Data Logging
An internal, battery backed-up clock/calendar is used to time-stamp
temperature readings. The SR630 can be set to scan, time-stamp,
and record data on up to 16 channels at intervals from 10 to 9999
seconds. Data is either sent immediately to the printer, or stored
in the internal 2,000 point buffer for output at a later time (via
GPIB or RS-232).
Built-In Printer Interface
A standard Centronics printer interface makes it simple to get
hardcopy output of temperature or voltage scans. Two hardcopy formats
are provided. The SR630 can print a continuous strip chart showing
up to 16 different temperatures. In addition, data can be printed
in a tabular format which logs the time, date, and temperature or
voltage for each channel.
Analog Multiplexer
The SR630 can also function as a 1:15 analog multiplexer. Any of
the first 15 input channels can be switched out to channel 16 and
passed on to other instruments. This feature is useful in ATE systems
and many other monitoring applications.
Available Thermocouples
Although the SR630 will read types B, E, J, K, R, S and T type
thermocouples, for many applications type K, or Chromel/Alumel,
will serve well. K-type thermocouples offer a wide temperature range
(-200 °C to +1250 °C), a low standard error, and good corrosion
resistance.
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