8081 PERFORMANCE HIGHLIGHTS
| Parameter |
Ranges |
Accuracy |
Comments |
| DC Voltage |
1nV to 1000V |
4 ppm / year |
0.9 ppm 24 hour stability |
| AC Voltage |
0.1uV to 1000V |
150 ppm / year |
10Hz to 1Mhz Bandwidth |
| DC Current |
0.1pA to 30A |
7 ppm / year |
Reading rate down to 120mS |
| AC Current |
0.1nA to 30A |
300 ppm / year |
7 unique ranges |
| Resistance |
10 nOhm to 1 Tohm |
8 ppm / year |
2 wire and 4 wire modes |
| Temperature |
PRT & Thermocouple |
Sensor dependent |
ITS-90 and Direct Thermocouple input |
| Pressure |
10"H20 to 1500 psi |
0.04% |
Range of External Modules |
INSIDE THE 8000 SERIES PRECISION DMM
The 8000 series Digital Multimeter provides outstanding accuracy and linearity measurement performance together with ease of use.
The heart of any precision instrument is in its analogue design; the experience and knowledge gained by Transmille over 10 years in the development of its 3000 series precision multi-product calibrators, its innovation and commitment to quality have all been directed towards the design of the 8000 series multimeter.
The choice of components is critical in the design, the 8000 series uses precision foil resistors, with temperature coefficients less than 1ppm/°C and the latest in analog chopper stabilised op-amps and low leakage switches.
A temperature stabilised zener reference chip provides 1ppm stability/year. PCB design at this level is critical, and every effect from thermal EMFs to leakage must be eliminated if true 8.5 digit performance is to be achieved. To give stable readings in noisy environments the 8000 Series measurement cycle is phase-locked to the line power.
To complement the analog design the 8000 series multimeter digital design is also state of the art. The 8000 series is a multi- processor design, making full use of today's low cost digital processing power. Low-level processors handle the measurement ranging and A to D control, while a single 64 bit high performance processor handles data management. Circuitry, which would have just a few years ago taken up complete circuit boards, is now available on a single chip, improving reliability, reducing power and also cost, while at the same time improving performance.
By bringing together the latest technology in both analog and digital design Transmille have significantly reduced the parts count and the complexity of an 8.5 digit multimeter, achieving unrivaled performance at a breakthrough price.
8000 SERIES MEASUREMENT FEATURES
Programmable Terminal Switching
Allows remote control of front/rear input switching directly from the PC
or front panel menu for switching between a reference standard and unknown (UUT).
Intelligent Reference Ratio Function
A unique operating mode allows a known reference standard to be connected to the rear terminals, the unknown to the front terminals for ratio measurement. The 8000 Series can then automatically switch between the standards, displaying the value of the unknown as directly compared against the entered value of the known.
Temperature Measurement (8081)
Precision temperature measurement using PRT probes.
8081 includes advanced modes for co-efficient storage of SPRT probes.
Pressure Measurement (8081)
The Transmille range of pressure modules can be used with the 8000 Series
using the built-in adapter interface for direct pressure display.
Low Current Measurement (0.1pA to 10uA)
8081 DC Current ranges down to 10nA with a resolution of 0.1pA using a dedicated screened BNC input.
This input offers a ‘virtual’ ground approaching zero input impedance providing electrometer
performance in an integrated DMM package.
High Value Resistance Measurement (8081)
8081 resistance measurement up to 1 TOhm can be achieved using the dedicated low current screened BNC input (essential for low noise / high value resistance measurement). A high voltage (200V) source combined with a sub pA input provides a high performance resistance measurement system offering electrometer performance in an integrated DMM package.
The 8000 Series DMM complements the 3000 Series range of multi product calibrators, 3200 electrical test equipment calibrator and the 3000 Precision range of reference standards. This comprehensive range of Queen’s award winning instrumentation combined with the ProCal calibration software provides a complete solution for the modern calibration laboratory.
