Cryo-con Model 24C
Introduction
Silicon diode sensors
are supported over their full temperature range by using the
bridge in a DC, constant-current mode.
Thermocouple
sensors are supported by using an optional thermocouple module
that plugs into any of the Model 24C's input channels. Up to four modules can be
connected to a single instrument.
For all sensor types, conversion of a sensor reading into temperature is performed by
using a Cubic Spline interpolation algorithm. In addition to providing higher accuracy
than conventional linear interpolation, the spline function eliminates discontinuities
during temperature ramps or sweeps by ensuring that the first and second derivatives
are continuous.
Control Loops
There are four independent control loop outputs:
1. Loop #1 heater output is a linear, low noise RFI filtered current source that
can provide up to 1.0 Ampere into 50
resistive loads. Three full-scale
ranges are available in decade increments down to 500mW full-scale.
2. Loop #2 is a linear heater with two output ranges of 25-Watts and 2.5-Watt
full-scale into a 50
load.
3. Loop #3 and #4 are a non-powered analog voltage output intended to control
an external booster power supply. Output is selectable at 10 or 5 Volts full
scale.
User Interface
The Model 24C’s user interface consists of a large, bright TFT type Liquid Crystal
Display and a full 21-key keypad. In this user-friendly interface, all features and
functions of the instrument can be accessed via this simple and intuitive menu driven
interface.
The Home screen projects four user configurable zones that allow the real-time
display of all input channel, control loop and instrument status information. From this
screen, accessing any of
the instrument's
configuration menus
requires only the press of
a single key. As always,
convenient names can be
assigned to input
channels.
1A:Sample Holder 2B:First Stage
251.445
K
123.845
K
300.000K 1-Off-Low 100.000K 2-Off-Low
C:Second Stage D:Rad Shield
15.445
K
4.845
K
RO-600 RuOx 10mV R500 RuOx 1.0mV
Ä
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