INSTRUCTION MANUAL DL235 1-800-547-5740 • Fax: (503) 643-6322 www.ueitest.com • email: info@ueitest.
Introduction The DL235 combines the speed and versatility of a high resolution analog display with the precision of a digital meter. This meter measures the True RMS value of Alternating Current (AC) over from 0.3A to 700A. AC measurements are from 10 Hz to 1 KHz and frequency measurements are from 0.5 Hz to 10 KHz. Clamp meters that measure average current flow are inaccurate for non-linear currents and their measurements may have some differences from those obtained using this meter.
LCD Display Functional Description C o n t rols and Indicators 1 18 19 17 20 36 21 35 22 34 23 33 31 24 27 25 30 26 32 28 37 29 29 2 16 3 15 14 4 5 13 14. Soft Crest: Select “SOFT” for a running 3-second average, or CREST half cycle peak amperes. 15. AC/DC: Selects AC or DC mode. 6 7 16. Lever: Opens and closes clamp jaws. 11 10 8 17. Record: Displayed (blinking) when “MIN/MAX/AVG“ values are being recorded. Duration of RE CORD is limited by battery life. 12 9 1.
33. AC: Alternating current or voltage. 34. : Automatically indicate negative digital displays. 35. Auto: Displayed when autoranging controls bar graph scale (0 to 40A scale, or 0 to 400A scale) and controls position of decimal point on digital display. 36. Power Lock: Displayed when the “AUTO P O W EROFF” mode of the meter has been disabled. 37. Beeper: Beeps for push-button operation or current overload. 38. OFL: O v e r f l owindication.
Zero Adjustment by the Microprocessor To initiate the zero adjustment procedure, press the “HOLD” push-button for 2 seconds. Then, th meter beeps and the display reads zero just after the microprocessor memorized the right preceding display value that is used for calculating the exact DC amperes measurement value when measuring the DC amperes of a current-ca r rying conductor.
The resistance in the test leads can diminish accuracy on the lowest (400-ohm) range. The error is usually 0.1 to 0.2 ohms for a standard pair of test leads. When measuring resistance, be sure that the contact between the probes and the circuit under test is good. Dirt, oil, solder flux, or other foreign matter seriously affect resistance.
To stop recording, use the “HOLD” push-button. Then, “RECORD” no longer blinks, and the values of MIN, MAX, and AVG are frozen. Press the “HOLD” push-button again to restart recording, when the values of MIN, MAX, and AVG are not reset. The recording simply starts again from where it left off. Press and hold the “MIN/MAX” push-button for 2 seconds and then release in oder to exit “RECORD”. This meter acknowledges with a beep sound and “RECORD” is no longer displayed.
The electrical system designer must consider the following 3 issues when he designs a power distribution system containing harmonic current flow : 1. The AC neutral wires must be of sufficient gauge to allow for harmonic current flow. 2. The distribution transformer must have additional cooling to continue operation at its rated capacity, if it is not harmonic-rated.
Distribution Transformers You can measure excessive current, load balance between phases, True RMS and frequency of neutral current. True RMS measurement yields the effective value. 1. Press the “ON/OFF” push-button to turn on the meter. 2. Clamp around the phase wire of the transformer. Be sure the clamp jaws are securely closed, or measurements will not be accurate. 3. Observe the display for True RMS current flow. 4. Repeat your measurement for each phase to observe balance.
Frequency***1 WARNING! Under no circumstances should you expose batteries to extreme heat or fire as they may expose and cause injury. Range 0.5 to 999.9 Hz 1000 to 9999 Hz Resolution 0.1 Hz 1 Hz Accuracy ±(0.2% + 3 dgts) ±(0.2% + 3 dgts) ***1. Same as *1 7. Place a fresh 9V battery in the battery clip. With current autorange: Trigger Level, 5 Hz to 1500 Hz, 0.
Technical Data Display Maximum conductor size Maximum jaw opening Maximum conductor voltage Frequency range Crest factor, continuous waveform Adjacent conductor effect Operating temperature Operating humidity Storage temperature Standard equipment Battery type Battery life Safety standards (appropriate parts) Weight Size DL235-MAN Digital - 4000 counts (3 3/4 digits) [Hz: 9999 count], updates 4 times/sec. Analog - updates 20 times/sec. 41 segment bar graph. Ø 51 mm (2.00”) 52 mm (2.
DL235 True RMS Clamp-On Multimeter Limited Warranty The DL235 is warranted to be free from defects in materials and workmanship for a period of five years from the date of purchase. If within the warra n ty period your instrument should become inoperative from such defects, the unit will be repaired or replaced at UEi’s option.
