Rolson 27259 DMM
Cheap DMM.
At the time of writing, this digital multimeter is available in some UK "Bargain
Basement" type shops for just £4.
At that price, you should not expect top of the range equipment. Neither should you
expect it to come calibrated and with a certificate. However, this could be a useful
meter for hobby and basic repair work.
Functions.
*
DC Voltage: 5 ranges to 600v.
*
AC Voltage: 2 ranges to 600v.
*
DC current: 5 ranges to 10Amp
*
Resistance: 5 ranges to 2 MegOhm.
*
Diode test.
*
Transistor test: NPN and PNP gain test.
Specifications.
The specifications below are those stated by the manufacturer, which they say
they guarantee the product will meet for 1 year. As with many companies, they
reserve the right to change specifications at any time.
It should be noted that these may only be guaranteed within the stated environmental
conditions. Use or storage under other conditions may be considered misuse, allowing
them to refuse any guarantee.
Environment.
*
Working temperature: 0 to 40 degrees C.
*
Storage temperature: -15 to 50 degrees C.
*
Working humidity: Less than 75%.
DC Voltage.
|
Range
|
Resolution
|
Accuracy
|
|---|
|
200mV
|
0.1mV
|
0.8% of reading +/- 2 digits
|
|
2V
|
1mV
|
|
20V
|
10mV
|
|
200V
|
100mV
|
|
600V
|
1V
|
AC Voltage.
|
Range
|
Resolution
|
Accuracy
|
|---|
|
200V
|
100mV
|
1.2% of reading +/- 13 digits
|
|
600V
|
1V
|
DC current.
|
Range
|
Resolution
|
Accuracy
|
|---|
|
0.2mA
|
100nA
|
1.2% of reading +/- 2 digits
|
|
2mA
|
1 microAmp
|
|
20mA
|
10 microAmp
|
|
200mA
|
0.1mA
|
1.2% of reading +/- 8 digits
|
|
10Amp
|
10mA
|
2% of reading +/- 2 digits
|
Resistance.
|
Range
|
Resolution
|
Accuracy
|
|---|
|
200 Ohm
|
0.1 Ohm
|
2% of reading +/- 10 digits
|
|
2K Ohms
|
1 Ohm
|
|
20K Ohms
|
10 Ohms
|
|
200K Ohms
|
100 Ohms
|
|
2M Ohms
|
1K Ohm
|
1% of reading +/- 2 digits
|
Diode test.
|
Voltage
|
Current
|
Measurement
|
|---|
|
2.4v
|
1.5mA
|
Forward voltage drop.
|
Transistor test.
|
Vce
|
Ib
|
Measurement
|
|---|
|
2.8v
|
10microAmp
|
hFE: Zero to 1000
|
