This product is not available for new orders.
| Services Available | |
|---|---|
| Repair | Yes |
| Free Support | Yes |
概览
DMM600为便携式的电池供电的凋落物含水量测量计，可以精确地测量凋落物的含水量。凋落物对森林火险非常重要。DMM600为独立工作的设备（不需要数据采集器），含有一个筛子、运输箱和软件。
优势与特点
- 在野外测量凋落物含水量
- 紧凑，易于运输
- 易于使用 — 简单地将凋落物放置在测量室内，拧紧，接收实时的读数
图像
技术说明
DMM600使用对介电常数敏感的测量技术来测量目标的含水量。包含包装电子器件的圆柱体、带挤压把手的样品腔、以及一个LCD读取显示器。
为了测量凋落物含水量，将样品放置在样品腔内，旋转挤压把手，当声音提示信号响起时，说明挤压力度合适，测量已经完成。测量所需的全部时间约30秒。测量读数仅仅显示在实时LCD显示器上，并没有被存储下来。
DMM600为与美国农业部森林服务中心、落基山脉研究站和Missoula技术开发中心共同合作，而开发出的产品。
产品规格
| Battery | 9 V alkaline |
| Measurements per Battery | More than 2,000 |
| Accuracy | ±5% full scale range |
| Resolution | 1% volumetric water content |
| Sieve Description | #4 mesh = 0.475 cm (0.187 in.) |
| Diameter | 8.9 cm (3.5 in.) |
| Length | 25.4 cm (10 in.) |
| Weight | 1.7 kg (3.7 lb) |
Typical Current Drain |
|
| Between Measurements | ~3 mA (Goes into a low-power sleep mode after five minutes of inactivity.) |
| Sleep Mode | 140 μA |
| During Measurement | 85 mA for ~1 ms |
兼容性
Data Logger Considerations
The DMM600 is a stand-alone product so data logger compatibility is not an issue.
Software
PCDMM Software is supplied with the DMM600. It interfaces with the DMM600 using serial communications, and is used to download and upload calibration coefficients, monitor the battery voltage, and reset the DMM600.
Calibration Coefficients
A standard calibration converts the output of the measurement circuit to volumetric water content. User-derived calibrations can be downloaded using PCDMM software. These calibrations are useful when using the DMM600 with atypical materials. Guidance is provided in the operating manual for deriving calibrations. This feature can also be used with known duff bulk density to convert result to gravimetric water content. Measurements derived from the standard and user-defined calibrations are alternately displayed on the LCD if a user-defined calibration has been downloaded.
Sieve and Carrying Case
The DMM600 comes with a sieve and case. The sieve fits in the opening of the sample chamber. Duff is moved through the wire mesh of the sieve to break up large fragments and improve measurement accuracy in duff materials with a large range of fragment sizes.
The case eases transport and provides storage for the sieve and small items such as a spare battery, screwdriver, and pencil.