The Keithley/Tektronix instruments measure bridgewire resistance and thermal transient using the TTM custom firmware and communicating over USB, Ethernet or GPIB interfaces.
Embedded Thermal Transient System
The embedded firmware measures bridge wire and estimates the thermal transient voltage from the measured thermal transient trace.
Bride Wire resistance:
Current Level: 0 – 10 mA
Accuracy: 0.001 Ohm
Range: 0 – 10 Ohms
Measurement Duration: 1 power line cycle (16.7ms @60Hz)
Pass Fail Detection: Low and high limits.
Current Level: 0 – 999mA
Maximum sampling rate:
TTM 26xx: 12 KHz
TTM 24xx: 2.2 KHz (TTM 2014 only)
Number of samples: 20 to 1000.
Thermal Transient Voltage (0 – 200mV)
Thermal Time Constant (ms) mean and standard error;
Thermal Asymptote (mv) mean and standard error.
Thermal Transient Trace.
Pass Fail Detection:
Thermal Transient Voltage low and high limits
Saves test results a USB device connected to the instrument.
Installs and tests new firmware.
Developer access to the instrument using Windows-based tools.
Installation packages for the run time components and a package for source code delivery.
Each runtime package includes the following components:
Software embedded in the instrument;
Software is embedded in the instrument. Also included is a Windows program to update and test the embedded software.
Source Code Package
Each source code package includes the following components:
Virtual Machine (e.g., VMWare file format);
Windows Operating System (Windows 7) and drivers (e.g., NI-488 + NI-VISA);
Development Environment for compiling run times from the source code (Visual Studio Express and Test Script Builder);
Test plan delineating the steps required to compile new releases and install them on new machines.
For acceptance of the source code package, customer will run the virtual machine at their facility and go through the test plan described above.
Source Code Updates
New source code packages will be prepared with each new release.
Email support with FTP software and firmware updates.
Software and firmware come with a non-exclusive unlimited license for use the software and firmware on one system.