RC METERPLUS INSTRUCTION MANUAL APPA 76
Introduction 1.1 Unpacking and checking Upon removing your new RC Meterplus from its packing, you should have the following items: 1. RC meterplus. 2. Test leads set (one black and one red). 3. Operating manual. 4. Protective holster. 1.2 Front Panel Refer to Figure 1 and the following nunberes steps to familiarize yourself with the meter’s front panel controls and connectors. 1.
4. Rotary function and range switch — This switch is used to set the desired function and range. 5. Capacitance sockets — The terminals of capacitors can be inserted in these sockets to allow their capacitance to be measured directly. 6. Capacitance input terminal (+) — Positive input for capacitance measurements. Takes banana plug. 7. Capacitance input terminal (-) — Negative input for capacitance measurements. Takes banana plug. 8.
Figure 1 3
Specifications 2.1 General specification Display : 31⁄2 digit 1999 count LCD display. Polarity indication : Automatic, positive implied negative indicated. Over range : "1" or "-1" Low battery voltage indication : "=" shown if the voltage from the battery drops below the operating voltage. Measuring Tate : 2 times per second, nominal. Operating temperature : 0 to +50°C, 0 to 80% RH. Storage temperature : –20 to +60°C, 0 to 80% RH. When battery removed from meter. Temperature coefficient : 0.
2.2 Electrical specification Accuracy is ± (reading + number of digits) at 23°C ± 5°C, less than 75% RH. (1) Capacitance Range Resolution Accuracy 200pF 0.1pF ±(0.5%rdg + 1dgt + 0.5pF) 2nF 1pF 20nF 10pF 200nF 100pF 2µF 1nF 20µF 10nF 200µF 100nF Test frequency 820Hz ±(0.5%rdg + 1dgt) 82Hz 2000µF 1µF ±(1%rdg + 1dgt) 20mF 10µF ±(1.5%rdg + 1dgt) 5 8.
Testing voltage : 3.2V peak (max.). The (+) socket is always positive relative to the (-) socket. Input protection : The tester is protected against capacitor discharge (above 50V) by a 0.25A, 250V quick-acting fuse. Zeroing for capacitance : restricted to approx. ± 20pF (2) Resistance Range Resolution Accuracy Max. open circuit voltage 200Ω 0.1Ω ±(0.75%rdg + 4dgt) 3.2V 2kΩ 1Ω 20kΩ 10Ω 200kΩ 100Ω 2MΩ 1kΩ ±(0.75%rdg + 1dgt) 20MΩ 10kΩ ±(2%rdg + 1dgt) Overload protection ±(0.
(3) Diode testing Range Resolution Accuracy Max. test current Max.open cuicuit voltage 1mV ±(1.5%rdg + 5dgt) 1.5mA 3.2V Overload protection: 500V DC/AC max. (4) LED Test Testing Voltage : 3.2V max. Test Current : 2mA or 10mA two ranges. LED lamp lighted test, display reading is LED forward voltage approx.
(5) Transistor hFE Test, Trainsistor Leakage Iceo Test 0 - 1000 hFE values either PNP or NPN transistor hFE Base Current : 10µA approx. hFE Vce : 3V approx. Iceo : 10nA - 20.00µA. (6) SCR Test SCR good/defect test. (7) Battery testing Battery type Load 9V Battery Load. 15mA approx. 1.5V AA, C or D Cell Load: approx. 150mA 1.55V Button Cells Load: approx. 0.8mA Display reading is battery Voltage approx.
OPERATION 3.1 Measuring capacitance WARNING : 1. Never apply voltage to the test terminals; this could damage or destroy the tester. 2. Fully discharge capacitors before testing them. 3. With polarised capacitors, make sure they are connected with the correct polarity. 4. Do not test capacitors in-circuit. Procedure: 1. Switch on tester (move on/off switch to "ON" position). The appearance of numbers on the LCD display indicates the tester is on. 2. Set to the 200pF range.
4. If the capacitance of the capacitor you are going to measure is specified, set the appropriate range. If it is not, start with the 200pF range. If an over range is indicated, go to the next range up. Continue doing so until the over range annunciator disappears and a measurement is shown. This will ensure that you are using the range offering the maximum possible resolution. 5.
Note: 1. An open-circuited capacitor will show "0" on all the ranges (expect for a few pF on the 200pF range). 2. When using the 200pF range, you are advised always to use the short test leads if the measuring socket cannot be used in the particular case. Long test leads introduce quite large amounts of additional capacitance. If the capacitance of the leads is more than 20pF, it will not be possible for you to null it with the zero adjuster.
7. Capacitors (and particularly electrolytic capacitors) are often subject to wide tolerances. Hence the values measured are often up to 100% more than the nominal values but they are seldom drastically below them. 8. The tester uses an a.c. voltage method of measurement which is less subject to errors than the d.c. ramp voltage method when the capacitors being measured have high leakage currents, which electrolytic capacitors often do. 3.2 Measuring resistance 1.
3.4 Testing transistor leakage current (ICEO) 1. Switch on tester (move on/off switch to "ON" position). 2. Turn rotary switch to the desired ICEO range (PNP or NPN). 3. Connect the transistor straight into the transistor socket. The holes of the socket are marked E, B and C for emitter, base and collector. 4. Read the leakage current (ICEO) of the transistor straight off the display. The unit of measurement is µA. 3.5 Testing of SCRs/ thyristors (good/bad) 1.
BATTERY REPLACEMENT The tester is powered by a single 9V battery. To change the battery, refer to Fig.2 and follow the instructions given below. 1. Remove the test leads from the component being tested, switch the tester off (move on/off switch to "OFF") and unplug the test leads from the input terminals. 2. Lay the tester front-face-down on a work surface and unscrew the three screws in the bottom half of the case. 3.
Bottom half of case 9V Battery Top half of case Battery Connector Figure 2 15
FUSE REPLACEMENT To change or check the fuse, refer to Fig.3 and follow the instructions given below. 1. Carry out steps 1 to 3 of the instructions for changing the battery. 2. Lift the printed circuit board out of the top half of the case. Do not unscrew any of the screws in the printed circuit board. 3. Carefully remove the fuse from the fuse holder by first levering one end out of one clip and then pulling the fuse out of the other clip. 4. Fit a new fuse of the same size with the same ratings.
Top half of case Fuse Holster Fuse Bottom half of case Fuse 0.25A, 5 x 20mm, fast blow, 250V, HBC 1.
HOW TO USE THE PROBE HOLDER Clip one probe on the holster for one handed meter operation. Wrap the leads around the holster to store the test probes.
HOW TO USE THE TILT STAND AND HOLSTER Swing the stand out for easier meter reading. Swing the upper holder out and hook it over a door.
HOW TO USE THE TILT STAND AND HOLSTER Meter in holster face down Hang on a nail at the workbench 20
APPA TECHNOLOGY CORP. 9F.119-1 Pao-Zong Rd., Shin-Tien, Taipai, 23115, Taiwan, R.O.C. P.O.Box. 12-24 Shin-Tien, Taiwan. Tel : 886-2-29178820 Fax : 886-2-29170848 E-MAIL:info @appatech.com http://www.appatech.com Printed In Taiwan Copright 1997, APPA Tech., Corp. All rights reserved.
