
Temperature Controlled Fixed Resistors
By temperature controlling an otherwise very stable resistor a performance close to the very best available World-wide can be achieved at a…
microK2
The microK² builds on the success of the original microK models that were quickly adopted by leading National Metrology Institutes and commercial laboratories. Retaining Isotech’s proven measurement technology, and capable of uncertainties as low as 7.5 μK, the microK² remains a first choice for work with SPRTs and supports all standard thermometer types including standard thermocouples, industrial PRTs and thermistors.
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The microK² introduces several developments designed to enhance usability, accuracy and flexibility. A new fourth measurement channel accepts SPRTs, reference resistors or the channel expander, broadening system capability. The touchscreen has been upgraded to a 10.1-inch high-resolution display with improved capacitive touch response, while the input terminals are now more robust and easier to use. Connectivity has also been expanded, with Ethernet, two RS232 ports and three USB ports, along with updated software features.
NEW: The microK² family is available in four performance levels, from the highest-accuracy ELITE model through to the 60, 150 and 300 variants. Full accuracy, equivalent temperature performance and detailed specifications are shown in the table and in the datasheet.
Performance by Design – Inherently Drift-Free
The microK was developed with a clear design philosophy: to deliver genuine long-term performance without relying on “tweak pots”, software adjustments or self-calibration routines. This approach results in resistance ratio measurements that are inherently drift-free, providing stable and repeatable performance over time. As a ratio bridge, the microK uses a substitution topology that eliminates drift without compensation circuits or software offsets. The instrument therefore maintains its performance without requiring adjustment or service intervention, reducing long-term operating costs.

Since its introduction in 2006, the microK platform has been rigorously studied and validated by temperature metrologists worldwide, confirming its reliability and long-term stability. For further technical detail on the microK family and its underlying design principles, visit our technical library.

| Accuracy, Whole Range | 30 ppb |
|---|---|
| Equivalent Temperature Accuracy Whole Range / Water Triple Point | 30 μK / 7.5 μK |
| Accuracy, Whole Range | 60 ppb |
|---|---|
| Equivalent Temperature Accuracy Whole Range / Water Triple Point | 60 μK / 15 μK |
| Accuracy, Whole Range | 150 ppb |
|---|---|
| Equivalent Temperature Accuracy Whole Range / Water Triple Point | 150 μK / 38 μK |
| Accuracy, Whole Range | 300 ppb |
|---|---|
| Equivalent Temperature Accuracy Whole Range / Water Triple Point | 300 μK / 75 μK |
| Weight | 13.2 kg |
|---|---|
| Resolution, Temperature | 0.001 mK (0.000001 °C) |
| Input Channels NEW | Four, three front and one rear |
| Ratio Range | Unlimited |
| Ratio Accuracy Stability | Zero drift |
| Ratio Accuracy Temperature Coefficient | Zero |
| Resistance Range | 0–500 kΩ |
| Keep-Warm Current | Each channel individually programmable |
| Voltage Range (thermocouple) | 125 mV |
| Voltage Accuracy (0–20 mV) | 0.15 μV (≈0.006 °C for Pt/Au thermocouple at 1000 °C) |
| Resolution, Voltage | 10 nV |
| Cold Junction Mode | External and remote with PRT |
| Sensor Current NEW | 0–14.2 mA per channel |
| Cable Length | Up to 10 Ω per core and 10 nF shunt capacitance (≈100 m RG58) |
| Temperature Conversions NEW | PRTs: ITS-90, CvD Thermocouples: IEC 60584-1:2013 (B–T), L, Pt/Pd, Au/Pt Thermistors: Steinhart–Hart, Polynomial |
| Internal Resistance Standards | 25, 100, 400 Ω |
| Optional Internal Values | 1, 10, 10 kΩ |
| Internal Standard Stability | TCR <0.5 ppm/°C, drift <2 ppm/year |
| Input Connectors | Gold-plated 4 mm binding posts (tellurium copper), for plugs, spades or bare wire |
| Interfaces | Ethernet, 3× USB Host, 2× RS232, IEEE-488 (GPIB) |
| Store Calibration Coefficients | Unlimited |
| Datalogger | 32 GB |
| Expandable NEW | Up to 90 expansion channels |
| Switching Technology | Solid state |
| Units | Ratio, V, Ω, °C, °F, K |
| Display | 10.1-inch high-resolution touchscreen, anti-glare |
| Operating Conditions | Full spec: 15–30 °C, 10–80% RH Operational: 0–40 °C, 0–95% RH |
| Power | 85–264 Vac, 50/60 Hz, 20 W max |
| Dimensions | 539 × 200 × 300 mm (19-inch rack mountable) |

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