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CALIBRATION

Meter Calibration

(See Operating and Testing the Multimeter Section for meter operating instructions).

1. Obtain a voltage source of 0.1V as measured by an accurate voltmeter.  The circuit of Figure 7 will work fine.
2. Set the range switch to 0.5VDC.
3. Connect the test leads as shown in Figure 7.
4. Adjust R1 for a reading of 0.1V (10 on 50V scale) on the M-1150 meter.
If a DC power supply or an accurate voltmeter is not available, then use a fresh 1.5V battery and adjust R1

to read 1.55V on the 2.5V scale (155 on 250V scale).

Shunt Wire Calibration

To calibrate the shunt wire, you will need a 5A current source like a 5V power supply and a 1

25 watt resis-

tor.  If a 5A source is not available, you can use a lower current (2A).  If no supply is available, it is not impor-

tant to do this test.  Set the range switch to 0.25A/10A position and connect the red and black test leads as

shown in Figure 8.  Read the current on the 0-10 scale immediately below the meter mirror.  If the meter

reads high, resolder the shunt wire so that there is less between the two mounting holes.  If the meter reads

low, resolder the shunt wire so that there is more wire between the mounting holes.

Figure 6

Figure 7

Figure 8

 

Summary of Contents for M-1150K

Page 1: ...ANALOG MULTIMETER MODEL M 1150K Assembly and Instruction Manual Elenco Electronics Inc Copyright 1995 Elenco Electronics Inc Revised 1997 REV D 753012...

Page 2: ...black yellow brown 174031 r 1 R16 6 75M 1 1 2W blue violet green yellow brown 176731 r 1 R8 15M 1 1W brown green black green brown 181532 r 1 R1 680 Pot 191311 r 1 R25 10K Pot 191515 NOTE All fixed re...

Page 3: ...be heated sufficiently so that the solder flows freely Apply the solder simultaneously to the component lead and the component pad on the PC board so that good solder flow will occur Be sure that the...

Page 4: ...gend Band r R1 680 Pot see Figure A r D2 2CZ82P Diode see Figure C r R18 2K 1 1 4W Resistor red black black brown brown r R24 18K 1 1 4W Resistor brown gray black red brown r R19 44K 1 1 4W Resistor y...

Page 5: ...own r R7 4M 1 1 2W Resistor yellow black black yellow brown r R6 800K 1 1 4W Resistor gray black black orange brown r R5 150K 1 1 4W Resistor brown green black orange brown r R3 5K 1 1 4W Resistor gre...

Page 6: ...of grease on top of the spring r Place a ball bearing on top of the spring and carefully push it down into the housing r Holding the bearing in place insert the housing into the case as shown in Figur...

Page 7: ...r Install the the two AA batteries in the battery compartment Be sure to observe the polarity markings on the bottom of the battery compartment r Connect the battery snap to the 9 volt battery and pl...

Page 8: ...the 2 5V scale 155 on 250V scale Shunt Wire Calibration To calibrate the shunt wire you will need a 5A current source like a 5V power supply and a 1 25 watt resis tor If a 5A source is not available...

Page 9: ...ck resistors R24 R25 and R2 through R9 for cor rect values and good solder connections No AC voltage reading 1 Check for open fuse Refer to Figure 8 for a better understanding 2 Check diodes D1 throug...

Page 10: ...assemble and try the Dial Scale Reading Exercise included with this kit Before starting tests set the meter needle to zero The zero adjust screw is located on the meter face next to the base of the ne...

Page 11: ...red and the other with a black alligator clip There is a 24K resistor in series with the black wire on the double test lead To measure the hFE beta of an NPN transistor proceed as follows 1 Plug the...

Page 12: ...ng of the meter is a very important factor to be considered when measuring the voltage of a high resistance circuit Take the example where two 1M resistors are connected in series across a 9V bat tery...

Page 13: ...s is compared to the external resistor in a series circuit The current is supplied by the 3V battery on the X1 X10 and X1K ranges On the X10K range a 9V battery is placed in series with the 3V battery...

Page 14: ...t and the lower the effective resis tance The meter reads this resistance and the hFE of the transistor may be read on the hFE scale Figure 13 Specifications Measurement Ranges Accuracy Remarks DC Vol...

Page 15: ...SCHEMATIC DIAGRAM 14...

Page 16: ...Elenco Electronics Inc 150 W Carpenter Avenue Wheeling IL 60090 847 541 3800 http www elenco com E mail elenco elenco com...

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