INSTRUCTION MANUAL DM397 1-800-547-5740 • Fax: (503) 643-6322 www.ueitest.com • email: info@ueitest.
Introduction The DM397 is an advanced full-featured digital multimeter designed for engineers, HVAC and electrical technicians, whose work demands greater accuracy and resolution. The RS232 data logging kit and software (included) allows any measured parameter to be monitored or recorded to a PC for further analysis. The 50,000 count dual display shows two parameters simultaneously eliminating the need to toggle between selections. The DM397 stands alone as the best value in highend multimeters.
C o n t rols and Indicators 9 Rotary Switch To turn the meter on, turn the rotary switch from the OFF position to any switch setting. If you want to view the full display (all segments illuminated), press and hold the “HOLD” push-button while turning the meter on. Release the button to return to normal viewing. 1 3 Turn the meter on by selecting any measurement function. The meter presents a standard display for that function (range, measurement units, on screen menu, etc.).
User-Friendly Rotary Switch Selections DM397-MAN P.
Push-Buttons RANGE: Use the “RANGE” push-button to manually select a range. Press and hold the “RANGE” push-button for two seconds to return the meter to auto range mode. The meter is in auto range mode when the “AUTO” indicator is on. The range and units are displayed on the LCD. MIN/MAX: Press this button to scroll through the minimum, maximum and average values. The minimum (MIN) reading is displayed first and this mode calculates an average (AVG) of all readings taken since the mode was activated.
On Screen Menu Selection Keys Each setting of the rotary switch to a measurement function position may activate one or more menu selection key settings on the LCD. If there is more than one measurement for a rotary switch setting, a menu appears on the display. Press the corresponding menu selection key to select the desired measurement. Setup Mode The setup mode allows you to customize default settings.
Operating Instructions Making Measurements All measurements are made by first setting the function knob to a specific setting (the meter will select the default function for that position) and then select a measurement using the menu keys. Note that not all function knob settings have a corresponding menu selection option. For example, the steps below show how to take a DC voltage measurement. 1. Set the measurement knob to V for a voltage measurement. NOTE: The default for this range is AC voltage. 2.
Another useful feature of this meter is AC/DC dual display mode. AC voltages riding on power supplies can cause problems with electronic circuits. If the meter is set to DC volts mode, the display shows the DC component of 6.0000V. However, the AC component may be missed. It is recommended that you set the meter to AC/DC dual display mode by pressing menu key 4 twice. The primary display shows the 1.2000 V AC and the secondary display shows the 6.000 V DC.
Continuity Test The continuity function detects intermittent opens and shorts lasting as little as 1 millisecond. These brief contacts cause the meter to emit a short beep. This function is convenient for checking wiring connections and operations of switches. A continuous tone indicates a complete wire or connection. CAUTION! Using resistance and continuity function in a live circuit will produce false results and may damage the instrument.
To Measure AC or DC Current 1. Turn off power to the circuit and discharge all high-voltage capacitors. 2. Insert the black lead into the “COM” terminal and the red lead into an input terminal appropriate for the measurement range. Rotary Switch Input Ranges µA mAµA 500.00µA, 5000.0µA mAµA 50.000mA, 500.00mA A 5.0000A, 10.000A - A mA NOTE: To avoid blowing the meter’s 440mA fuse, use the mAµA terminal only if you are sure that the current is less than 400mA.
Battery and Fuse Replacement Always use a fresh replacement battery of the specified size and type. Immediately remove the old or weak battery from the meter and dispose of it in accordance with your local disposal regulations. Batteries can leak chemicals that corrode electronic circuits. If your meter is not going to be used for a month or more, remove and store the battery in a place that will not allow leakage to damage other materials.
Feature Summary DC Current Backlight For clear readings in poorly lighted areas Fast auto ranging Meter automatically selects the best range quickly 500 µA 10 nA AC+DC total RMS Choices for AC only, AC+DC readings or AC and DC 5 mA 100 nA (@40Hz to 10 kHz) Dual display 50 mA 1 µA DBm, dBV User selectable impedance references for dBm 500 mA 10 µA 5A 100 µA 0.3% + 10 10 A 1 mA 0.
Continuity Burden Voltage (A, mA, µA) Audible threshold: The beeper sounds if the measured resistance is lower than 10 Ω, Function and turns off when greater than about 70 Ω. Response time: mA / µA < 1 m sec. Diode Test A Range 4V Accuracy Test Current (typical) 2% + 1 1 mA Open Circuit Voltage Range Burden Voltage (typical) 500 µA 150 µV / µA 5000 µA 150 µV / µA 50 mA 3.3 mV / mA 500 mA 3.3 mV / mA 5A 0.03 V / A 10 A 0.03 V / A <3.
Burden Voltage: Burden voltage is a voltage drop across the input terminals of a current measuring device, caused by internal shunt resistance. Burden voltage contributes to the measurement error, and should be as low as practical. Temperature Coefficient: Temperature Coefficient is a factor used to calculate the change in indication or output of an instrument with changes in temperature.
DM397 True RMS Digital Multimeter Limited Warranty The DM397 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.