| Forum Home | ||||
| PC World Chat | ||||
| Thread ID: 105360 | 2009-11-29 02:51:00 | Is my multimeter accurate? | Nomad (952) | PC World Chat |
| Post ID | Timestamp | Content | User | ||
| 834538 | 2009-11-29 02:51:00 | Just got a multimeter. Tested 3x cars while they were off. They were each at 27V. Is this correct :confused: |
Nomad (952) | ||
| 834539 | 2009-11-29 03:11:00 | Is it supposed to be on DCV? That provides 12.48V when car is off. | Nomad (952) | ||
| 834540 | 2009-11-29 03:25:00 | Is it supposed to be on DCV? That provides 12.48V when car is off. 12.48V DC sounds about right for a normal car battery. What did you have it set to when you got the 27V reading? |
somebody (208) | ||
| 834541 | 2009-11-29 03:27:00 | Depending on what part of the car you were measuring the news could be bad or dreadful. If you are measuring the power at the ignition system which is turned off, things are crook. If your car is a 24 volt nominal system, you have a gimmicked car needing expensive parts If your meter is set to 20V DC range and you are measuring a 12V nominal battery, the meter is about useless. If it is set to 200VDC, on a 12 V battery, it is a silly meter and should be returned for a refund. A 12V lead acid battery left to settle at 20 deg C for 8 hours or so after any charging should give around the following readings: 12.65 v = 100% charge 12.45 v = 75% charge 12.24 v = 50% charge 12.06 v = 25% charge 11.9 v or lower = Flat as a tack (The 2 decimal digits of precision look good, but are not very often meaningful.) |
R2x1 (4628) | ||
| 834542 | 2009-11-29 03:27:00 | That was V, maybe that is AC V? It is a 20V DC on the meter (set at). The car has been in the garage over a week not used. Totally off, keys off etc. No idea what ignition system it uses. Everything is bolted down cannot even see the battery unless I take the covers off etc... |
Nomad (952) | ||
| 834543 | 2009-11-29 06:07:00 | I'd say you have a bung multimeter. | pine-o-cleen (2955) | ||
| 834544 | 2009-11-29 06:14:00 | I'd say you have a bung multimeter. More like a spot of finger trouble, and not knowing your AC from your DC....now what was that Elsie and Doris Waters song about turning off the AC and switching on the DC ? :clap |
Terry Porritt (14) | ||
| 834545 | 2009-11-29 06:21:00 | Did you take the readings directly at the battery terminals? Try your meter (same switch position) on a 9v (e.g. smoke alarm) battery and tell us the reading. It always pays to get a second opinion! |
coldot (6847) | ||
| 834546 | 2009-11-29 07:05:00 | I need to find a 9V battery. For a AA battery in DC it reads 1.2V, in AC it reads 2.2. | Nomad (952) | ||
| 834547 | 2009-11-29 07:12:00 | I need to find a 9V battery. For a AA battery in DC it reads 1.2V, in AC it reads 2.2. Batteries should be measured using the DC setting. |
somebody (208) | ||
| 1 2 | |||||