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(As it turns out, guarantee you have adequate credit on your card to cover the deposit. The vehicle enrollment association needs to guarantee itself against fixes, fines, or cleaning costs. This is if anything turns out gravely while you have the vehicle. So how might you have the option to manage to avoid it?Įxactly when you go to get a select vehicle, the rental firm will demand to hinder some money on your Visa for a deposit. People go on a spectacular trip and drop the enrolled vehicle back, be that as it may, there's an issue: The vehicle utilizes association keeps down a couple or the sum of the deposit. Harbor Freight Tools later had this very multimeter on sale and refunded me the difference in price.You've heard the nerve-racking stories. That honor goes to the "error" and continuity test beeper, which spikes things up to between 35 and 43 mA. It is not the backlight that ultimately draws the most current. I've not tested to see where the low battery threshold is set, perhaps I will do that later and amend this description accordingly. Using the backlight knocks that figure down tremendously, to about a day's worth of operation. If I figured it right, the batteries should be good for at least 300 hours of no-backlight operation after deducting a bit more to account for the threshold at which the low battery warning might be set. Deducting a little from that figure to account for energy lost while in storage, and these being cheap batteries probably leaves around 250 mAH per battery, which you won't get at all at once without significant voltage drop and certainly not for anything like an hour. Turning the backlight on kicks things up to 25.6 mA and it appears that the backlight stays on until you specifically turn it off.įigures online seem to suggest that the "average" carbon zinc AAA battery has about 320 mAH worth of energy storage capacity. Current drawn under normal test ranges with the backlighting turned off hovers around 2.04 mA. I'll probably do one of those modifications when the warranty on my meter runs out.īattery life, even when running from carbon-zinc "heavy duty" batteries, seems like it ought to be pretty good. (Neither Mastech nor Harbor Freight sell a variant of this meter with RS-232 capability.) You can read more about the modifications here: There is even an RS-232 indicator in the display, suggesting that this feature almost made it to the finished product. I spoke incorrectly regarding the Mastech / Cen-Tech meter's communication capability. The low current test socket claims to have self-resetting protection. Unlike some other multimeters, the 10 amp test socket is fused. Sawtooth waveforms at high audio-range frequencies (20 kHz) are not handled well by this meter's frequency measurement range. If anyone has a good idea as how I could accomplish accuracy testing of the light range in an informal environment *without* special tools or calibrated sources beyond light bulbs having known light output in lumens and current draw, such suggestions would be appreciated. If you're in a hurry, here's how it breaks down (all times are approximate):ġ4:20 Undocumented Features (actually RS-232, not USB)ġ5:00 Display/Buttons/Dial/Sensors Close-upġ8:05 Batteries Installed / Fuse OverviewĢ0:30 Viewer Suggestions: Requiem for a RadioShack MeterĢ2:25 Illuminated Test Lead Connection Safety FeatureĢ4:45 Initial DC Voltage Test (SLA Battery)Ģ6:10 Availability Service Literature / Accuracy Adjustmentsģ2:22 Resistance Tests (audible continuity test tone, low (0.1 ohm), high (51 K ohm)ģ6:02 Diode Test, 1N4007 low voltage drop diodeģ6:39 Capacitor Tests (400 V 22 ♟, 100 ♟, 50 V 22/44/66/88 ♟)Ĥ1:36 Temperature/Humidity Accuracy Tests (internal sensors)Ĥ3:41 Test Lead Misconnection Safety AlarmĤ4:44 Various AC Voltage Measurements, Accuracy, lack of true RMS measurement capabilityĤ7:45 Frequency Measurements, Limits and Accuracyĥ2:15 Assorted External Thermocouple Tests and Accuracyĥ6:16 Sound Level Meter Tests, Useful Frequency Range and Accuracy This video is so long because it is meant to be reasonably thorough.
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Testing capacitors above 50 ♟ did not work reliably. Although some of RadioShack's specifications are honest, I know for a fact that my example of the 22-811 multimeter would *not* test capacitors up to 400 ♟ as their spec sheet claimed, no matter how much time it had to do so. The RadioShack meter has some better specifications on paper, while the Mastech does more and seems to be better made. You will also find this meter sold as the Dawson Tools DSM101N. To make a long story short, I think this multimeter does enough well that it is good value for money at its regular price and outstanding value if you find it on sale somewhere. Nor do I have access to precision voltage, resistance, temperature, sound level, light or current sources.
#CEN TECH 7 FUNCTION DIGITAL MULTIMETER CABLES EXTRA PROFESSIONAL#
Fine print, up front: I'm not a professional product reviewer.