Model BDM40 Bench Digital Multimeter Be nch Digit a l Mult im e t e r Operator’s Manual
LIMITED WARRANTY AND LIMITATION OF LIABILITY Your Meterman product will be free from defects in material and workmanship for 90 days from the date of purchase. This warranty does not cover fuses, disposable batteries or damage from accident, neglect, misuse, alteration, contamination, or abnormal conditions of operation or handling. Resellers are not authorized to extend any other warranty on Fluke’s behalf.
FOR UNITED KINGDOM ONLY NOTE: This lead/appliance must only be wired by competent persons WARNING: THIS APPLIANCE MUST BE EARTHED IMPORTANT: The wires in this lead are coloured in accordance with the following code: E Green/ Yellow: Blue: Brown: Earth Neutral Live (Phase) N L As the colours of the wires in main leads may not correspond with the colours marking identified in your plug/appliance, proceed as follows: The wire which is coloured Green & Yellow must be connected to the or coloured Green or G
INTRODUCTION This instrument is a line powered, bench-type digital multimeter with a 4-1/2 digit LED display. The DMM can measure AC/DC volts, AC/DC current, and resistance. Among other features: True RMS Measurements of AC or AC+DC Signals : True RMS measurement is the only accurate way to directly measure AC or AC+DC signals that are not noise-free pure sine waves. This instrument measures AC voltage frequencies up to 50 kHz.
The LED Display The high-contrast 4-1/2 digit LED display is easily read from across the room. It can register from 0000 to 19999 counts. For ease of discussion, the 19999 will be rounded to 20000 in the remainder of this text. For example, we will refer to the 2V range, not the 1.9999V range. In all linear functions, the decimal point position is determined by the range selected. Polarity of the input signal is indicated by a ‘ – ‘ sign at the center of the left side of the LED.
OPERATING GUIDELINES INTRODUCTION To use your multimeter fully, there are some additional factors to be considered, such as measurement techniques, the maximum signal input levels that will not damage your instrument, and common applications. Operating Notes The operating notes present the capabilities and limitations of this instrument and routine operator maintenance instructions. Everyone using an DMM should be familiar with the operating notes.
MEASUREMENT TECHNIQUES The information provided here describes techniques In measurement and interpretation of measurements that may extend the usefulness of your DMM. These techniques, common throughout the electronics industry, have been tailored specifically for this instrument. AC Measurement Techniques When making precise measurements of AC signals, there are special parameters that must be considered such as the type of AC converter the meter uses (average, rms, etc.
Your instrument has a crest factor range of 1.0 to 3.0 at full scale. Going down from full-scale, the crest factor capability increases from 3.0 to: Full-Scale x 3 (i.e. 6 at half-scale) RMS Value , If an input signal has a crest factor of 3.0 or less, voltage measurements will not be in error due to dynamic range limitations at full-scale.
the rise and fall time equals the slew rate of 1.75 µsec. To do this we will calculate the values for the theoretical signal with zero rise and fall time, then calculate the values for a signal with the same period but with total slope periods equal to 1.75 µsec. A comparison of the results will show the measurement error due to the finite bandwidth.
The light grey area around the ACV / DCV switch is extended up and to the right to enclose the five range values of the voltage function. Push the range switch immediately above the value to be measured. The range selection switches are interlocked in the same manner as the function switches. Perform the following procedure: 1. If the test leads are not connected, plug them into your DMM: red test lead to the V-Ω terminal and black to the COMMON terminal. 2. Select the 0.2V range. 3.
PEAK VOLTAGES AC COUPLED INPUT WAVEFORM METERED VOLTAGE AC COMPONENT ONLY DC AND AC TOTAL RMS RMS CAL AC TRUE RMS DC COMPONENT ONLY 1.414 1.000 0.000 0.000 1.000 1.414 1.414 0.421 0.435 0.900 1.000 2.000 2.000 0.764 0.771 0.636 1.000 2.000 1.000 1.110 1.000 0.000 1.000 1.414 1.414 0.785 0.707 0.707 1.000 2.000 2.000 2.22 K 2K 2D 3.464 1.732 .960 1.000 0.000 PK PK 0 - PK 2.
Circuit loading error Connecting most voltmeters to a circuit may change the operating voltage of the circuit if it loads the circuit down. As long as the circuit resistance (source impedance) is small compared to the input impedance of the meter, the error is not significant. For example, when measuring voltage with your meter, as long as the source impedance is 1 kΩ or less, the error will be ≤ .01 %.
= 100.16 = 10.01 mV = 100.04 = 10.00 mV The error will be about 0.01mV the error is not significant CURRENT MEASUREMENTS All of the controls and terminals used to make current measurements are located on the front panel. The AC mA and DC mA function switches determine the measurement function. The colored area around the 20A switch extends up and to the right to enclose the six range values for the 20A measurement function. Push the range switch immediately above the value to be measured.
Maximum current error due to Burden Voltage EB E −I in % = 100 x in milli Amps = 100 x B M E S − EB E S − EB Examples: Es = 14V, RL = 9Ω, IM = 1497.mA, 1497.0 EB = 100 x x1.0 = 74.9% of 1.0 = 0.749V 2000.0 .749 .749 Maximum error in % = 100 x = 100 x = 5.06% 14 .749 13.251 Increase displayed current by 5.65% to obtain true current. Maximum error .749x1497 1121.2 = = = 84.6mA in milli Amps 14 − .749 13.251 Increase displayed current by 84.6mA to obtain true current.
CALIBRATION WARNING THESE SERVICING INSTRUCTIONS ARE FOR USE BY QUALIFIED PERSONNEL ONLY. TO AVOID ELECTRICAL SHOCK, DO NOT PERFORM ANY SERVICING OTHER THAN THAT CONTAINED IN THE OPERATING INSTRUCTIONS UNLESS YOU ARE QUALIFIED TO DO SO. Introduction This section contains the maintenance information for this Digital Multimeter. This information is divided into service information, general maintenance, a group of performance tests, a calibration adjustment procedure, and troubleshooting.
4. 5. 6. Turn the instrument upside down as viewed from the front panel. All adjustments necessary to complete the calibration procedure are now accessible. For reassembly, reverse the procedure (be careful to align the grooves in the sides of the front panel with the guides located inside the case and to bend the flexible interconnect inwards and out of the way).
Table 4. Display Test SELECT DISPLAY RANGE 00.00* 200Ω .0000* 2kΩ 0.000 20kΩ 00.00 200kΩ 000.0 2000kΩ 0.000 20MΩ *The least significant digit(s) may change by several digits from zero, depending on your test lead resistance. Linear Voltage Test Use the following procedure to verify the proper operation of both the AC and DC V functions: 1. Select DC V, 200mV range. 2. Connect the calibrator HI volts output to the V-Ω terminal and the calibrator LO volts output to the COM terminal. 3.
Current Test Use the following procedure to verify proper operation of both the AC and DC mA measurement functions: 1. Select DC mA, 200µA range. 2. Connect the calibrator HI amps output to the V-Ω terminal and the calibrator LO amps output to the COM terminal. 3. For each step in Table 6, select the listed range, program the calibrator for the corresponding UUT input, and verify that the UUT display value lies within the indicated limits. 4.
DC Voltage Calibration On the UUT select DC V, 2V range, and connect the calibrator HI volts output to the V-Ω terminal and the calibrator LO volts output to the COM terminal. For each step in Table 8, select the listed range, program the calibrator for the corresponding UUT input, and make the specified adjustment or check. Table 8. DC Calibration Step 1 2 3 4 5 Range 200mV 2V 200mV 200V 1000V Input Short + 1.9000V + 190.00mV + 190.00V + 1000.
MAINTENANCE Changing Input Power Configuration This meter was shipped with power cords and fuses for 117V (USA) and 230V (European) operation. The initial configuration is for 230V. Fuse Replacement This DMM has two fuses. The main power fuse is 0.08A or 0.125A, 250V for line protection. The current measurement fuse is 2A / 250V for below 2A current measurements (unscrew the mA – 2A input jack). 117 Line Fuse T 0.125A / 250V 230V Line Fuse T 0.
Non-Warranty Repairs and Replacement – US and Canada Non-warranty repairs in the United States and Canada should be sent to a Meterman Test Tools Service Center. Call Meterman Test Tools or inquire at your point of purchase for current repair and replacement rates. In USA Meterman Test Tools 1420 75th Street SW Everett, WA 98203 Tel: 888-993-5853 Fax: 425-446-6390 In Canada Meterman Test Tools 400 Britannia Rd. E.
ELECTRICAL: The electrical specifications apply for an operating temperature of 18°C to 28°C (64.4°F to 82.4°F), relative humidity up to 90%, and a 1- year calibration cycle. DC VOLTS: RANGE ± 200 mV ± 2V ± 20V ± 200V ± 1000V RESOLUTION 10µV 100µV 1 mV 10mV 1000mV ACCURACY for 1 year ± (0.03% of reading + 4 digits). Input Impedance: 10MΩ in parallel with < 100pF, all ranges. Normal Mode Rejection Ratio: >60dB at 60Hz or >50dB at 50Hz.
* * Typically 3 to 5 digits of drift will be observed at full scale at 20Hz. Crest Factor Range: Waveforms with a Peak / RMS ratio of 1 :1 to 3:1 at full scale. RESISTANCE RANGE 200Ω 2kΩ 20kΩ 200kΩ 2000kΩ 20MΩ RESOLUTION ACCURACY for 1 Year 0.01Ω 0.1Ω 1ΩΩ 10Ω 100Ω 1kΩ ± (0.1% reading + 4 digits) ± (0.1% reading + 4 digits) ± (0.25% reading + 4 digits) FULL SCALE VOLTAGE ACROSS UNKNOWN RESISTANCE 0.2V 2V 2V 0.2V 2V 2V Overload Protection: 250V DC/AC rms on all ranges.
Manual Revision C 09/03 Manual Part Number 1566418 Information contained in this manual is proprietary to Meterman Test Tools and is provided solely for instrument operation and maintenance. The information in this document may not be duplicated in any manner without the prior approval in writing from Meterman Test Tools. Specifications subject to change. © Meterman Test Tools, 2003 U.S.
