LO-3 Demonstration of use of multimeter to measure voltage (battery)

voltage.wmv
Windows Media Video, 2.6MB, 720X480

Software used
Adobe Premier 6.0, (clip capturing from miniDV, editing), TechSmith Camtasia Studio (sound recording)

Metatags
electronics, multimeter, voltmeter, ammeter, battery, resistor, ohm, voltage, resistance, current, Wavetek

Original AVI file: 67MB
Media type: Windows Media Video (wmv)
File Size: 2.6MB
File Length: 00:20 sec
Resolution: 720X480 (DV)
Bit rate: 505Kbps
Audio codec: Windows Media Audio v8, 32 kbps, 32 kHz, stereo
Video codec: Windows Media Video v7

Considerations
Clips captured from miniDV camera were in the order of 20-60MB in file size, depending on length. Video edited using Premier, saved as NTSC DV (720X480) AVI file (no sound), resulting file was 67MB (20 sec). Reducing image size resulted in blocky images. Reducing frame rate or dropping frames was experimented with, none very satisfying. Note that there are many codecs, dependent on client’s Internet download rate, such as 56K modem, ISDN single or double or broadband.

AVI file brought to Camtasia to add sound track. Saved in a variety of formats, such as Quicktime (Cinepak video codec worked best), but file size still 19MB. Saving in Windows Media Video format proved best, resulting in small file sizes without appreciable loss of image. (Unfortunately only Windows based system can view at present). Much consideration will have to be made on keeping image size or length of clips small to retain quality, or else burn onto CD/DVD media.

Clip lengths seem ideal for quick lessons, though it is a challenge to keep within time limits.

Further Work
AVI or Quicktime files may be useful saved on CD, DVD or video tape. A collection of short video illustrating all measurement procedures would be useful as a teaching resource in electronics.

Next >>