Sanwa PC20TK Bruksanvisning
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PC20TK
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MULTIMETER
PC20TK
Assembling Training for
Digital Multimeter
Instruction Manual for Assembling and Operation Procedures
Introduction
Thank you very much for purchasing Sanwa Model PC20TK Digital Multimeter Kit.
The PC20TK is a digital multimeter kit that we have developed for educational use through a wealth of
our experiences and achievements.
Although primarily designed as a kit, this product provides eight modes including voltage and current,
as well as high durability, allowing you to use it for a broad range of purposes.
In order to ensure its best performance as a finished product, you need to learn the procedures for
properly assembling, adjusting and handling the PC20TK and making measurements.
Please thoroughly read this manual and make the best use of the PC20TK.
The instruction manual should be carefully kept along with the PC20TK.
Contents
[1] Warnings for Safe Use of Multimeter
1-1 Explanation of symbols ....................................................................................................................... 1
1-2 Warning messages .............................................................................................................................. 1
[2] Using the PC20TK
2-1 Intended uses and features ................................................................................................................. 2
2-2 Names of various parts ........................................................................................................................ 2
2-3 Specification ........................................................................................................................................ 3
2-4 Explanation of functions ...................................................................................................................... 4
2-5 Preparations for measurement ............................................................................................................ 5
2-6 Measuring procedure ........................................................................................................................... 5
2-7 Replacing the fuse and batteries ........................................................................................................ 11
2-8 Storage and others ............................................................................................................................. 11
[3] Basic Knowledge of Digital Multimeter
3-1 Analog vs. digital ................................................................................................................................ 12
3-2 Analog multitester (AMT) vs. digital multimeter (DMM) ...................................................................... 12
3-3 Construction of digital multimeter ...................................................................................................... 13
3-4 Working of input signal conversion section ........................................................................................ 14
3-5 Working of A/D conversion section .................................................................................................... 15
[4] Assembling
4-1 Soldering ............................................................................................................................................. 20
4-2 Soldering procedure ........................................................................................................................... 20
4-3 Precautionary instructions for assembling ......................................................................................... 21
4-4 Color codes and symbols of components.......................................................................................... 21
4-5 Preparations for assembling ............................................................................................................... 23
4-6 Mounting and wiring components to printed circuit board (large) ..................................................... 24
4-7 Wiring the printed circuit board (small) (Fig. 4-9) ................................................................................ 27
4 -8 Attaching the connector covers to the printed circuit board (small) (Fig. 4-10) ................................. 27
4-9 Mounting the readout (LCD), the printed circuit boards, and the dial plate ....................................... 27
4-10 Assembling the rear case ................................................................................................................... 29
4-11 Assembling and operation checks ..................................................................................................... 29
4-12 Adjustments ........................................................................................................................................ 30
4-13 Layout of components on the mounting surface ................................................................................ 31
4-14 Circuit diagram of the PC20TK ........................................................................................................... 32
[5] Inspection and Calibration
5-1 Calibration procedure ......................................................................................................................... 33
5-2 Error rate ............................................................................................................................................. 34
5-3 Example of completing the table for test results ................................................................................ 34
** Table for Test Results .......................................................................................................................... 35
[6] Calculation Problems for Input Circuit ................................................................................................... 37
[7] Overview of Troubleshooting .................................................................................................................... 39
[8] After-sale Service (8
-
1) - (8
-
5) ..................................................................................................................... 40
1
[1] Warnings for Safe Use of Multimeter
(Be sure to read this section before using the multimeter.)
The instructions given in the text under
Warning and Caution must be observed to prevent
burns, electric shocks and other similar accidents.
1-1 Explanation of symbols
The symbols and their meanings used on the PC20TK and the instruction manual are shown below:
: Indicates information that is particularly important for safe use.
• A warning message is given to prevent burns, electric shock and other accidents resulting in
injury or death.
• A cautionary message is given relating to any possibility of damaging this product.
: Indicates that this part is potentially dangerous because it may be charged with high voltage.
:
Double insulation or reinforced insulation
: Fuse
: Buzzer + : Positive
: Ground : AC : Diode - : Negative
Ω : Resistance
: DC : Capacitor
1-2 Warning messages
The following warning messages are given to prevent accidents resulting in injury or death owing
to burns, electric shock or other. Be sure to observe these instructions along with the ones
included in this instruction manual.
1. Do not use the PC20TK with any power line exceeding 6 kVA.
2. Be careful about voltage of 33 VAC rms (46.7 Vpeak) or 70 VDC minimum because it is
dangerous to the human body.
3. Do not input any signal exceeding the maximum rated input value.
4. Do not try to measure a line (e.g., to a motor) where induced voltage or surge voltage may
occur, because the maximum overload input value might be exceeded.
5. Do not use the PC20TK if its main body or test lead is damaged or broken.
6. Do not use the PC20TK with its case removed.
7. Do not use any substitute for a fuse or connect wire for non-electrical use.
8. During measurement, do not hold any portion of the test pin beyond the test lead.
9. Do not input voltage to the current measurement connector. Inputting voltage to that connector
will result in a short-circuit, blowing out the built-in fuse. However, this may involve a danger.
10. Do not change over to any other mode during measurement.
11. Ensure that you have selected the proper range and mode for each measurement run.
12. Use the specified type (TL-21) of test lead.
13. Do not try to make a measurement with the PC20TK or your hand being wet.
14. Use the PC20TK indoors.
15. Check the appearance and the display of each mode (range) at least once a year.
Warning
The PC20TK is not provided with an automatic power-off capability. Be sure to turn OFF the Function
switch after measurement has been finished, because the batteries will otherwise run out earlier.
Caution
Prior to the assembling of the PC20TK, check the parts in accordance with paragraph (2) in "4-5
Preparations for assembling."
Note
Produktspecifikationer
| Varumärke: | Sanwa |
| Kategori: | Inte kategoriserad |
| Modell: | PC20TK |
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