- Cen-tech 95670 All-sun Em129 Multimeter User Manual 95652
- Cen-tech 95670 All-sun Em129 Multimeter User Manual Pdf
- Cen-tech 95670 All-sun Em129 Multimeter User Manual Volts Testers
- Cen-tech 95670 All-sun Em129 Multimeter User Manual 98025
Cen Tech Digital Multimeter 90899 Manual. Used Cen-Tech Automotive Meter 95670 with case and manual. $27.95 CEN-TECH 7 FUNCTION DIGITAL MULTIMETER #90899 DIGITAL LCD. CENTECH DIGITAL MULTIMETER TESTER. Cen tech p30756 user manual - 100 results like 7 Function Digital. Sep 30, 2013 How bad can a cheap multimeter be? EEVblog Electronics Community Forum. A Free & Open Forum For Electronics Enthusiasts & Professionals. I finally went and looked through the owner's manual of that Cen-Tech meter. There is no mention anywhere of a low battery indicator. So the user has to figure out or intuitively know that the.
The all-sun EM3081 is one of the best rated pocket multimeters. Coming in a nice, flip-open boxy design that incorporates lead storage in the lid, this diminutive meter has an easy to use panel incorporating dial, display and selector switch.
Easy to carry and store, it has multiple features, including being able to measure DC and AC voltage, DC current and resistance. It will also perform continuity and diode checks. In short, this is a handy meter, especially useful for those into motorcycle maintenance.
Key Features
- Measures AC/DC voltage to 250V
- Measures DC current to 200mA
- Resistance range up to 2MΩ
- Performs continuity tester
- 2.5V diode tester
- Size: 144mm × 56mm × 23mm
- Weight: 100g (with batteries)
What’s Included?
- Leads (hard-wired
- 1.5V button cells (LR44)
- Basic instructions
In-depth Review of the EM3081
Although a fairly basic multimeter, the EM3081 measures most main criteria, including AC and DC voltage, DC current, resistance, and continuity and diode checks. This is a manual ranging meter, although each individual range is spread across a given position, such as 200V/200mA/200kΩ. It is thus easier to use than a standard, manual-ranging multimeter. Continuity and diode check functions are on the same range position.
The EM3081 is small and cheap enough to have several for various tasks – one for around the home, another for the vehicle, etc. It is only CAT-II-rated, so although it can measure to 250V AC, a category 2 rating means it shouldn’t measure mains voltage directly, such as from a socket outlet.
The accuracy is also okay – comparing with full size meters of the same price range and higher. The probe leads are adequate for the meter, though some of the negatives include lack of easy battery compartment access, a lack of display backlight and also no auto power-off function. It is also tough to find an online manual for theall-sun EM3081.
Design
At about the dimensions of the iPhone 6s, the Chinese made EM3081 is pretty small; however, although you may have heard ‘credit card sized’, it certainly isn’t. It is nevertheless a small device that sits in the palm of the hand, with its flip-back case providing handy lead storage and a stand. The overall size makes it ideal for putting away inside bags, toolboxes, under bike seats and in glove compartments.
Batteries: This all-sun is powered by a couple of LR44 button cells. While included with the meter, you first need to remove the isolating plastic from the battery contacts for the thing to work.
Interface
The smooth interface consists of a display sat beside a flat dial, with the leads emerging from the top. The display is a bit on the small side and may be tough to read for those with eyesight issues. It has a resolution of 3 1/2 digits (2000 count) and samples at a rate of between two and three times a second. While fairly sharp, it is not backlit, but then not many multimeters are at this price point.
Function and Performance
The rotary selector switch is much like a standard multimeter. Although a manual-ranging meter, it turns through a small arc, since different range values are represented on each position – you change each measuring criteria by sliding the selector switch. The dial may be tough to operate with one hand.
A polarity check displays a ‘–‘ on negative polarity, and there is also a low battery indicator. As there is no auto power-off function and the batteries are not very power efficient, turning the all-sun EM3081 off after use is a must. It is fairly accurate, but continuity checks are not fast.
Protection
The EM3081 is CATII-rated and fused to 200mA. With a CAT-II rating, you can test systems connected to mains current, but should not test socket outlets or circuit breakers directly. This all-sun is thus best for lower powered work; testing appliances, circuit boards and batteries, etc.
Pros and Cons
PROS
- Compact
- Easy to use
- Fits in pockets
- Flip-back case
- Cheap
CONS
- No auto-off
- Manual ranging
- Doesn’t measure AC amperage
Roundup
There are few other pocket multimeters on the market like the all-sun EM3081. Most have the design of a typical DMM; open-faced with leads emerging from the bottom. The handy flip-case protects the interface and neatly stashes away the test leads, also making it easy to store. Even though a manual ranger, it is easy to use, with various ranges on each position corresponding to a sliding switch. It is also cheap.
Alternatives: There are many alternatives, such as Amprobe’s PM55A, but this is more than double the price. The auto ranging Etekcity MSR-P600, however, has more features and is similarly priced.
An electrically savvy handyman frequently carries a digital multimeter in his tool box or service vehicle. A properly used multimeter measures both voltage and current for alternating current, or AC. The multimeter also measures voltage and current for direct current, or DC. Electronic hobbyists can also test diodes, resistors and transistors with the Cen-Tech 92020 digital multimeter. Safety-conscious workmen and hobbyists receive prior instruction in the multimeter’s operation, as the device measures potentially deadly electrical voltages.
Measuring AC Voltage
Place the red lead’s plug end into the jack marked “V-ohm-mA.” Place the black lead’s plug end into the jack marked “COM.”
Cen-tech 95670 All-sun Em129 Multimeter User Manual 95652
Set the multimeter to read AC voltage. Turn the range selector knob to the position marked “750 ACV.”
Turn the meter on. Slide the power switch to the “On” position.
Touch each probe to the item for which voltage is being measured. Use the probe ends of the leads. Do not allow your fingers to touch the probes, as lethal voltage may be present.
Read the digital display’s indicated voltage. Adjust the range selector knob to a lower range if the voltage is less than 200 volts.
Turn the meter off. Slide the power switch to the “Off” position.
Measuring DC Voltage
Place the red lead’s plug end into the jack marked “V-ohm-mA.” Place the black lead’s plug end into the jack marked “COM.”
Set the multimeter to read DC voltage. Turn the range selector knob to the position marked “1,000 VDC.”
Turn the meter on. Slide the power switch to the “On” position.
Touch each probe to the item for which voltage is being measured. Use the probe ends of the leads. Do not allow your fingers to touch the probes, as lethal voltage may be present.
Read the digital display’s indicated voltage. Adjust the range selector knob to a lower range if the voltage is less than 200 volts.
Turn the meter off. Slide the power switch to the “Off” position.
Cen-tech 95670 All-sun Em129 Multimeter User Manual Pdf
Measuring DC Current
Place the red lead’s plug end into the jack marked “10A.” Place the black lead’s plug end into the jack marked “COM.”
Set the multimeter to read DC current. Turn the range selector knob to the “10A” position.
Turn the meter on. Slide the power switch to the “On” position.
Touch each probe to the item for which current is being measured. Use the probe ends of the leads.
Read the digital display’s indicated current. Adjust the range selector knob to the “200 mA setting.” Move the red plug to the “VmA” jack if the reading is 200 mAmps or less.
Turn the meter off. Slide the power switch to the “Off” position.
Cen-tech 95670 All-sun Em129 Multimeter User Manual Volts Testers
Measuring Resistance
Turn off the power to the device for which resistance is being measured. This ensures the multimeter will not be damaged.
Place the red lead’s plug end into the jack marked “V-ohm-mA.” Place the black lead’s plug end into the jack marked “COM.”
Set the multimeter to read resistance. Turn the range selector knob to the “200 ohm' position.
Turn the meter on. Slide the power switch to the “On” position.
Touch the red and black probes together. The display should indicate a resistance of 0 ohms.
Touch each probe to the item for which resistance is being measured. Use the probe ends of the leads.
Read the digital display’s indicated resistance. Adjust the range selector knob to the next higher setting if the meter reads “1.”
Cen-tech 95670 All-sun Em129 Multimeter User Manual 98025
Turn the meter off. Slide the power switch to the “Off” position.
Measuring Transistor hFE or Gain
Set the multimeter to read transistor hFE. Turn the range selector knob to the “hFE” position.
Turn the meter on. Slide the power switch to the “On” position.
Insert the transistor pins into the appropriate transistor jack; either “NPN” or “PNP.” Place the transistor’s emitter pin in the “E” jack. Place the collector in the “C” jack. Place the base in the “B” jack. Obtain the type of transistor and pin out from online reference material.
Read the transistor’s hFE indicated on the digital display.
Turn the meter off. Slide the power switch to the “Off” position.
Measuring Diode Voltage Drop.
Place the red lead’s plug end into the jack marked “V-ohm-mA.” Place the black lead’s plug end into the jack marked “COM.”
Set the multimeter to read diode voltage drop. Turn the range selector knob to the diode position.
Turn the meter on. Slide the power switch to the “On” position.
Touch the black probe to the diode’s cathode. Touch the red lead to the diode’s anode. Use the probe ends of the leads. The cathode has a dot or ring marking on the diode.
Read the diode voltage drop indicated on the digital display.
Turn the meter off. Slide the power switch to the “Off” position.