APPA 76 Manual de usuario
RC METERPLUS
INSTRUCTION MANUAL
APPA 76
1
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. Digital display — The 31⁄2 segment 1999-count digital LCD display has automatic annunciators for polarity,
decimal point, over range and low battery voltage.
2. Zero adjuster for capacitance — This allows the display to be zeroed when measuring capacitance (zeroing
range approx. ± 20pF).
3. On/off switch — Use this switch to switch the tester "ON" and "OFF".
2
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. Ω, E, D, LED input terminal (+) — Positive output for testing resistors, diodes and LEDs and positive input for
battery testing. Takes banana plug.
9. Ω, E, D, LED input terminal (-) — Negative output for testing resistors, diodes and LEDs and negative input for
battery testing. Takes banana plug.
10. Transistor and SCR socket for transistors and silicon-controlled rectifiers - and for measuring transistor
hFE and ICEO and for testing SCRs.
3
Figure 1
4
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 : 0.15 x specified accuracy/°C, <18°C or >28°C.
Power required : Standard 9V battery, NEDA 1604, JIS 006P, IEC 6F22.
Battery life : Approx. 200 hours on alkaline battery.
Dimensions (L x B x H) : 84 x 175 x 31 mm, without holster.
95 x 192 x 50 mm, with holster.
Weight (includ battery) : 340 gms without holster
550 gms with holster
Accessories : Protective Holster, Battery and Operators Manual
5
2.2 Electrical specification
Accuracy is ± (reading + number of digits) at 23°C ± 5°C, less than 75% RH.
(1) Capacitance
Range Resolution Accuracy Test frequency
200pF 0.1pF ±(0.5%rdg + 1dgt + 0.5pF)
820Hz
2nF 1pF
20nF 10pF
200nF 100pF
2µF 1nF
20µF 10nF
200µF 100nF 82Hz
2000µF 1µF ±(1%rdg + 1dgt) 8.2Hz
20mF 10µF ±(1.5%rdg + 1dgt)
±(0.5%rdg + 1dgt)
6
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 Overload
protection
200Ω0.1Ω±(0.75%rdg + 4dgt) 3.2V
500 Vd.c./a.c. (max)
2kΩ1Ω
±(0.5%rdg + 1dgt)
20kΩ10Ω
200kΩ100Ω
2MΩ1kΩ±(0.75%rdg + 1dgt)
20MΩ10kΩ±(2%rdg + 1dgt)
0.5V
7
(3) Diode testing
Range Resolution Accuracy Max. test current Max.open cuicuit
voltage
1.5mA 3.2V
1mV ±(1.5%rdg + 5dgt)
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.
8
(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.
9
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. Adjust the zero adjuster so that the lowest digit on the display is as close as possible to
changing from "1" to "0" and the "-" sign does not appear. If you need to use test leads, plug them in before you
zero the tester. Zeroing the tester with the leads connected allows the capacitance of the leads to be nulled.
Do not short the leads together.
3. You should zero the meter whenever you are going to make measurements in order that the last digit will be as
close as possible to "0". We would remind you that the highest resolution available is on the 200pF range.
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