MT-2018 Protective Function Analog Multimeter User’s Manual st , 1 Edition 2013 ©2013 Copyright by Prokit’s Industries Co., Ltd.
INTRODUCTION This Multi-meter is an accurate, safe, battery operated, rear tilt-stand, easy to operate handheld instrument with robust protective holster alongside and the adjustable back tilt device with hook-up design. It can offer accurate, reliable measurement of DC/AC Voltage, DC Current, Resistance and Diode, LED, Transistor, Decibels, and Capacitance with very high sensitive quality movement, and good-designed circuit, as well as mirrored Aluminum dial plate etc.
Test Functio ns DC V Range Accuracy 0-0.1-0.5-2.5-10-50 -250 V -1000V 3% FSD. 4% FSD. For 1000V AC V 0-10-50-250V -1000V 4% FSD. 5% FSD. For 1000V DC mA 0-0.05-2.5-25250 mA, 3% FSD. Ω X 1: 0.2 ~ 2KΩ midscale at 20Ω X 10: 2 ~ 20KΩ Midscale at 200Ω X 100: 20 ~ 200KΩ Midscale at 2000Ω X1K: 200~ 2MΩ Midscale at 20KΩ X10K: 2K ~ 20MΩ 4% of ARC of Scale Length 2 Remarks Input Impendence: 20KΩ/V Overload Protection: Max. 1000V AC/DC BUT 0.1V/0.5V/ 2.5V/10V/50V /250V Max.
Capacit ance (uF) Midscale at 200KΩ 0.025-0.25-25uF (C2) 3% FSD. Use the Optional Accessory Kit MT-2007-C Use the R x 1K range 2000uF(C1) Approximate Value BATT Check 0 ~ 1.5V: GOOD - ? – BAD 0 ~ 9V: GOOD - ? – BAD 5% of ARC of Scale Length Transist or Check LED, Diode Check Decibel hFE: 0-1000 via special hFE socket Approximate Value via special hFE socket Approximate Value At Ω X 10 Range -22 dB ~ + 62 dB (0dB=1mW at 600Ω) Internal Battery: R6P, AA, 1.
CALIBRATION Ohms Zero Adjustor located at the right side of the panel, adjusting the meter pointer to the Zero mark on the right side of Ohm scale of the meter dial when the test leads are touched together. Mechanical Adjustor Screw: located right below the center of the meter dial to set pointer to Zero mark at the left side of the scale. (-) Jack: Plug-in connector at the lower left on the panel for Black, negative test lead.
BEFORE OPERATING 1. Set the range switch to the proper position before making any measurement. 2. Never apply more voltage or current than the rated value in every position. 3. When the voltage or current to be measured it not known, always start with the highest range. 4. If meter indication is in the lower half of the scale and falls within the range of a lower scale, reset selector switch to the lower range for greatest accuracy. 5. If the meter won’t wotk at all, check the fuse located on the PCB.
OPERATION PROCEDURES DC Voltage Measurement WARNING: WITH EXTREME CARE WHEN MAKING MEASUREMENTS FOR HUGH VOLTAGE, AND DO NOT TOUCH TERMINAL OR PROBE ENDS. 1. Set the selector switch to the appropriate DCV range to be used. 2. Connect the BLACK test lead to the “-COM” jack and the RED test lead to the “+” jack. 3. If you know the polarity of the circuit to be tested, connect the black probe to the negative side. 4.
3. Check the needle position and the get the reading on V.A scale. DC Current Measurement WARNING: DO NOT APPLY VOLTAGE TO MEASURING TERMINAL WHILE RANGE SWITCH IS IN CURRENT POSITION DO NOT ATTEMPT TO MEASURE AC CURRENT. 1. Set the selector switch to the appropriate DC mA range to be used and connect the test leads in series with the circuit or the load under measurement. If the pointer deflects to the left, reverse the probes. 2.
3. Short the leads by touching the probes together. Pointer should read zero at the right hand end of the uppermost scale, if it doesn’t, use the Ohm adjust knob on the right hand of the panel to line up the pointer with zero. ( If pointer can’t be brought to zero, replace battery.) 4. Connect the test leads across the resistance to be measured. 5. Take reading on the top “Ω” scale and multiply it by the multiplication factor indicated by the selector switch. 6.
For IR (reverse current) test, reverse the connection. 1. Read the value IF or IR of the diode on the LI scale. 2. Read the linear (forward voltage) VF of the diode on the LV scale. Transistor hFE and LED Test Set the selector switch to the R X 10 range. For Measuring Transistor hFE 1. Take note the type of transistor “PNP” or “NPN” and then insert the transistor terminals of the Emitter, Base and Collector separately into the proper holes of the socket on the front panel. 1.
Battery Check 1. This meter can come with two separate battery check ranges to test either DC 1.5V or 9V batteries. 2. Set the selector switch to the appropriate BATT range to be used. 3. Connect the BLACK test lead to the “-COM” jack and the RED test lead to the Red “+” jack. 4. Connect the Red test lead to the positive end of battery and the Black one to the negative end of the battery to be measured. 5. Take reading on the “BATT” scale and check it good or bad as per which portion indicated.
Decibels Measurement 1. Set the selector switch to AC 10V range. 2. Connect the BLACK test lead to the “-COM” jack and the RED test lead to the “Output” jack. 3. Connect the test leads to the measuring circuit, and then read the bottom Red dB scale. 4. For more dB scope, change the selector switch to the others of ACV ranges and make the same actions. Add the appropriate number of dB scale reading as noted on the chart below. Note: For absolute dB measurements, circuit impedance must be 600 Ohm.
WARNING: DO NOT APPLY VOLTAGE TO MEASURING TERMINAL WHILE MAKING ANY CAPACITANCE MEASUREMENTS. BEFORE TESTING ANY CAPACITORS, DISCHARGE THE CAPACITOR COMPLETELY. BEFORE MEASUREMENTS, PLEASE READ THE INSTRUCTIONS OF MT-2007-C CAREFULLY. 1. For measuring the Capacitor over 25uF: 1) Set the selector switch to the R X 1K range. 2) Connect the BLACK test lead to the “-COM” jack and the RED test lead to the Red “+” jack. 3) Connect the test leads to the capacitor to be measured (Note the polarity of capacitor).
.Capacitance RANGE 0.025uF 0.25uF 25uF Multiplication Factor X 0.0001 X 0.001 X 0.1 After measurement, turn-off the power switches either of the MT-2007-C, or the tester. TROUBLESHOOTING Nevertheless, problems or malfunctions may occur. For this reason, the following is a description of how you can eliminate possible malfunctions by yourself: Error Possible cause The multimeter does not work. Are the batteries exhausted? Is the power indicator lit? Check the state of the batteries and the fuse 0.5A.
MAINTENANCE Replacement for Battery and/or Fuse should only be done after the test leads have been disconnected and POWER OFF. 1. Battery Replacement 1). Note the condition of the batteries using the procedure described above, if the battery needs to be replaced, remove the screw and open the upper cover of the battery cabinet on the rear case. 2). Take off the spent batteries and replace them with a battery of the same type.
MT-2018 24 檔指針型防誤測電錶 操作使用說明書 特點: 本機是指針式,防誤測全保護,斜立型三用電錶(附晶體 LED 座。具 有以下基本特點和參數如下: - 斜立型,可調後蓋支撐架(拉出後,向上轉動 90 度, 壓下可固定); 附帶掛鈎設計(支撐架向上轉動 180 度伸出後蓋,以便懸掛) 。 - 配置玻璃釺維環氧樹脂鍍金盤單面電路板,日系電池,並通過 CE 認證。 - 檔位切換簧片採用彈簧寶石軸承及二極體雙向限幅電路 - 具有全面的防誤測超載保護電路及速斷型保險絲多重保護 - 具有緊湊的兩側軟性防滑減振保護套 - 可測直流電壓,直流電流(最大 250mA) ,交流電壓,電阻,電晶 體,二極體,LED,電池, 和電容(2000uF Max.) 等. - 輸入阻抗:DC20Kohm /V,AC 9Kohm/V - 直流電壓:0.1/0.5/2.5/10/50/250/1000V 七檔 - 直流電流:50μA/2.5m/25m/250mA 四檔 - 交流電壓:10/50/250/1000V 四檔 - 電 阻:1/10/100/1K/10K 五檔 - 電 池:1.
規格表: 測試功能 檔位 說明 輸入阻抗:20KΩ/V 超載:Max 1000V 直 流 電 壓 0-0.1-0.5-2.5-10-50-2 ±3%FSD(滿刻度) 但在 0.1V/0.5/2.5V DCV 50-1000V ±4%FSD(1000V 檔) /10V 各檔,250V Max. 輸入阻抗:9KΩ/V ±4%FSD(滿刻度) ±5%FSD(1000V 檔) 超載:Max.1000V 交流電壓 0-10-50-250V-1000V ACV 頻 率 範 圍 : 但 10V/50V 檔,250V Max. 40~10KHz 壓降:250mV 直流電流 超載保護: 0-0.05-2.5-25-250mA, ±3%FSD(滿刻度) DCA F0.5A/250V X1:0.
最低 DC/AC 50V, 超載最大測試時間 5 秒。 三極管檢 hFE: 0-1000 測 LED, Diode Check 內部電源 參考值 使用Ω×10 檔 參考值 使用Ω×10 檔 1.5V5 號電池:2 節, 6F22.9V 矩形電池:1 節 指針防誤測斜立型三用電錶指針閱讀參考表 測試 Test 量程檔位 Range Position ×1 ×10 電阻(歐姆) ×100 Resistance(Ω) ×1K ×10K DC 0.1V 0.5V 直流電壓 2.5V (伏特) 10V DC Volt(V) 50V 250V 1000V DC 50μA 直流電流 2.5mA (安培) DC 25mA Current(A) 250mA 交流電壓 AC 10V (伏特) 50V 指標刻度讀數 Scale to read Ω 10 50 250 10 50 250 10 50 250 250 250 10V 50 17 倍數 Multiplied ×1 ×10 ×100 ×1000 ×10000 ×0.01 X 0.01 ×0.01 ×1 ×1 ×1 ×100 ×1 ×0.01 ×0.
AC Volt(V) 250V 1000V hFE Ω×10 Ω×10K ×1K ×100 二極體 Diode ×10 ×1 250 10 IC/IB ×1 ×100 ×1 μA×1 μA×10 μA×100 mA×1 mA×10 測量注意事項: 1. 指針調零 調整零位調整器,使指針和左側的零位對齊,不必每次測量前都 調,但是在開始測量之前,指標都必須確認指標在零位上。 2. 測試棒的連接紅色棒插“+"插孔,黑色棒插入“-COM"插孔。 3. 電錶內部電池檢查將表棒按以上規定方式接入好,再將檔位旋鈕 轉到 Rx10 檔位。然後,將表棒的兩端短路連接。這時,檢查指 針是否正常回歸零位。若不能,則電池電力不足,應要更換新電 池。 4.
測量工作程式: 1. 直流電壓: 用於測量電池、放大器電路、通訊設備電源、電子管和電晶體電 路偏 壓的直流電壓。7 個檔位元中的每一個檔位元標記,分別表 示該檔的最大電壓示值。 (※不確定之直流電壓,應從最大值依序向下調整量測) 2. 交流電壓: 用於測量商業交流電壓、交流電源電路、交流放大信號級等。4 個檔位元中的每一個檔位元標記,分別表示該檔的最大電壓示 值.(※不確定之交流電壓,應從最大值依序向下調整量測) 3. 直流電流:(不可測量任何交流電流或電壓!) 用於測量直流電源控制裝置的電流消耗、電晶體電路的工作電流 等。4 個檔位元中的每一個檔位元標記,分別表示該檔的最大電 流示值。 (※不確定之直流電流,應從最大值依序向下調整量測) 注意:本機具有防誤測保護電路。可短時(5 秒內)承受低於 AC/DC 250V 的電壓衝擊,僅爆保險絲。 4.
6. dB 測試: 本機測量 dB 值時,要將紅色表棒插入專用“OUTPUT"插孔,黑 色表棒插入專用“-COM"插孔; 然後檢視電錶讀數。 測量在 10V 檔上進行,可直接讀取 dB 刻度(-10dB~+22dB)。 測量在 50V 檔上進行時,刻度讀值要加 14dB,才是實際 dB 值。 測量在 250V 檔上進行時,刻度讀值要加 28dB。 測量在 1000V 檔上進行時,刻度讀值要加 40dB。 例如,在 1000V 檔上最大可測 dB 值是 22+40=62dB。 7. hFE(直流放大倍數)和發光二極體(LED)測試: 將量程選擇旋鈕置於“OHM"檔上之 X10 檔 hFE 測試: -調節 0 Ω 調整器使指針和零位對齊-將電晶體的三個管腳直接插 入面板上的 hFE 端座。 (※注意區分電晶體的類別“PNP"和“NPN"。 -在 hFE 刻度讀出顯示值,所讀之值是 IC/IB,即被測體的直流放大 倍數。 LED 測試: -將 LED 的兩個腳按正負極性直接插入面板上的 LED 的“+", “-"兩個端座。 -檢查 LED 是否正常發光。 8.
9. 電容測試: 注意:檢測前,須將電容放電並將電錶調零。(※此功能不能測試 帶電壓電路) A. 大電容(25uF 以上)檢測: 1) 將電錶量程選擇旋鈕置於“Ωx1k"檔 2) 用表棒連接電容,並注意“+",“-"極性。 3) 觀察指標偏轉最大時,電錶刻度板上紅色 C1 刻度。 B. 小電容(25uF 以下)檢測:須搭配選購 MT-2007-C 電容測試 器使用。(請在測試前,閱讀 MT-2007-C 使用說明) 1) 將電錶量程選擇旋鈕置於“DC50uA(C2)"檔 2) 將附件 MT-2007-C 的連接線,按顏色對應分別插入電錶的 “+"(紅) ,“-"(黑)輸入插孔中。 3) 將附件 MT-2007-C 上的電容量程選擇開關放置在適當的 量程位置。 4) 將附件 MT-2007-C 上的電源開關置於 ON 位置。 5) 直接將電容插入附件 MT-2007-C 上的 Cx 電容插座中,並 注意“+",“-"極性。 6) 觀察指標偏轉最大時,電錶刻度板上 A.V.C.刻度數。並按 照以下對照表,換算實際值。 電容量程 0.025uF 0.25uF 25uF 換算倍數 X 0.0001 X 0.
日常保養 更換電錶內部電池和保險絲管時,必須將表棒從電錶上移調,並切 斷電源。 1). 電池更換: 打開電錶的上部電池倉後蓋,從電池座中拿出不好的電池。再 將新的同規格電池放入原位,並注意電池的正負極性,然後, 蓋上後蓋並擰緊螺釘。 2). 保險絲管更換: 首先移去電錶兩側的軟性保護套,然後打開電錶的後蓋,從保 險絲座中拿出不好的保險絲管。 再將新保險絲管(0.
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