In this white paper, we will focus on software-defined networking (SDN) and network function virtualization (NFV), and how they are changing the way we design and deliver networks. We will discuss the key concepts and technologies of SDN and NFV, and how they can play a role in supporting network modernization and innovation. We will also discuss some successful deployment case studies, and the challenges that SDN and NFV face.
The HM34 is a pocket‑size, battery‑operated meter for measuring ambient relative humidity and temperature. It uses Vaisala’s HUMICAP® humidity sensor and a Pt 100 temperature sensor, and is intended for spot checks, industrial monitoring, occupational health, and laboratory use.
The manual covers product description, operation of the four function buttons, calibration and maintenance procedures, spare parts, technical specifications, and warranty information. It also includes sensor details, battery information, and optional accessories.
| Humidity measurement range | 0–100 %RH |
|---|---|
| Temperature measurement range | -20 °C to +60 °C (or -4 °F to +140 °F) |
| Humidity accuracy (field reference 0–90 %RH) | +2 %RH |
| Temperature accuracy | ±0.3 °C (±0.5 °F) |
| Resolution | 0.1 %RH, 0.1 °C (0.1 °F) |
| Supply voltage | 9 V battery (IEC 6F22) |
| Battery operating time | 50 h (typ.) |
| Automatic power‑off | after 3 minutes |
| Weight | 250 g |
The battery operates for about 50 hours of use.
Press the HOLD pushbutton; the display shows an (s) indicating the reading is held.
When the battery voltage is low, a (B) symbol appears on the display.
A one‑point calibration is done by adjusting the trimmer potentiometer marked “DRY”; for higher accuracy a two‑point calibration with a Vaisala HMK11 calibrator can be performed.