background image

24

Making Measurements

Hint: If you want to accurately mea-
sure a very small resistance, you can
view the resistance of the meter’s test
leads, then subtract that resistance
from the measured value. To mea-
sure the resistance of the test leads,
simply touch the ends of the leads to-
gether. The meter selects the 400

scale and displays the resistance of
the test leads. You can also use the
meter’s relative function to do this
(see “Using Relative Measurement”
on Page 17).

MEASURING 
CAPACITANCE

The capacitance measuring circuit in
your meter charges a connected ca-
pacitor to a specific voltage level,
then discharges the capacitor to a
lower voltage. The meter measures
the amount of time takes to discharge
the capacitor.

Caution: Do not connect the test
leads to a source of voltage with the
function selector set to 

. This

could damage the meter or the circuit
being tested.

1. Remove all power from the cir-

cuit under test and discharge all
capacitors.

2. Rotate the function selector to

.

3. Set the meter to measure capaci-

tance by pressing 

SELECT

nF

 or

µµµµ

F

 appears. Then repeatedly

press 

RANGE

 if necessary to

manually select the range you
want.

4. Attach the red test lead to the

positive side of the capacitor and
attach the black test lead to the
negative side of the capacitor. Or
remove one of the leads of the
capacitor you want to measure
from its circuit and connect the
test leads to the capacitor. The
measured value appears.

Note:  Electrolytic capacitors
have positive and negative termi-
nals. Be sure to connect each
test lead to the correct terminal to
match the polarity of these
capacitors.

Notes:  

• The voltage applied across elec-

trolytic capacitors will affect their
measured values. That is, a
measurement taken with a low
voltage will be different and lower
than that taken with a voltage
that approaches the capacitor’s
voltage rating. Since this meter
cannot use high voltage to set
the electrolyte, it cannot measure
the absolute value of capaci-
tance.

• Low-value capacitors might

match or be close to the actual
input capacitance of your meter.
To measure low capacitance val-
ues, use the meter’s relative fea-
ture to adjust the meter for the
meter’s own capacitance (see

Summary of Contents for 22-812

Page 1: ...Owner s Manual Please read before using this equipment 46 Range Digital Multimeter with PC Interface...

Page 2: ...lding a Measurement 17 Using Relative Measurement 17 Automatic Power Off 18 Using Power Lock 18 Using Monitor 18 Making Measurements 19 Measuring DC Voltage 19 Displaying Temperature 20 Measuring AC V...

Page 3: ...ring AC Voltage Frequency 27 Measuring AC Current Frequency 28 Measuring hFE 28 Using the Meter With a Computer 28 Installing the Meter s Software Hardware 29 Configuring Using the Meter and Software...

Page 4: ...set the range when measuring values you know are within a certain range Computer Interface with Supplied Software you can connect the meter to your computer and use the supplied software to log and gr...

Page 5: ...ith your meter and com puter to select the correct sampling rate for your application then capture and store data The software logs the time for each reading helping you keep track of each sample You...

Page 6: ...place the meter s battery or fuse Never operate the meter unless its back cover and battery cover are in place and fully closed This equipment is rated for instal lation category II maximum 3600VA Bec...

Page 7: ...LY SPECIAL PANEL MARKINGS For your safety we have added spe cial markings to the meter s panel to remind you of the measurement limi tations The maximum voltage that this meter can measure is 1000V DC...

Page 8: ...10A 400 A 0 8 of Reading 5 in Last Digit 4mA 0 6 of Reading 3 in Last Digit 40mA 0 8 of Reading 5 in Last Digit 400mA 0 6 of Reading 3 in Last Digit 4A 0 8 of Reading 5 in Last Digit 10A 1 0 of Readin...

Page 9: ...ivity 10 Hz 4 MHz 400Hz 4k 40kHz 50 mVrms 400kHz 100 mVrms 4MHz 250 mVrms AC voltage frequency with function selector set to C F V and maximum measuring frequency 1 kHz for signal above 40V 10Hz to 1...

Page 10: ...erating Temperature 41 F to 104 F 5 C to 40 C Storage Temperature 4 F to 140 F 20 C to 60 C Humidity Maximum Relative Humidity 80 for temperatures up to 87 F 31 C decreasing linearity to 50 relative h...

Page 11: ...ms and capacitance checks continuity and diodes mA A measures current A A measures current Guard WARNING THE GUARD PROTECTS AGAINST ELEC TRIC SHOCK DO NOT REMOVE IT hFE lets you measure the gain of sm...

Page 12: ...d mini mum readings Hz DUTY WIDTH measures frequency duty cycle and pulse width REL lets you work with relative measurements RANGE se lects auto or manual rang ing SELECT selects options HOLD holds a...

Page 13: ...screwdriver to loosen the battery cover s screw then lift off the battery cover 4 Snap a fresh 9V battery onto the terminals of the battery clip in the battery compartment 5 Replace the battery cover...

Page 14: ...wn on the bottom of the boot to remove it from the meter Use the clips on the back of the rubber boot to store the test leads while you are not using them Using the Meter Caution When the meter is not...

Page 15: ...de when you turn on the meter In the auto range mode appears and the meter automatically selects the next higher or lower range if available when the measure ment causes the display to over flow the m...

Page 16: ...in some DC and AC voltage ranges when the test leads are not connected to a circuit This is normal The high input sensitivity produces a wan dering effect When you connect the test leads to a circuit...

Page 17: ...the test leads to a compo nent This happens because the meter measures its own internal ca pacitance which is normal If you set the meter in relative mode with the small value as reference it does not...

Page 18: ...er and Software on Page 30 or if you turn off automatic power off see Using Power Lock To turn the meter back on after it au tomatically turns off press any but ton Using Power Lock To set the meter s...

Page 19: ...disappears Note When the meter is set to its voltage or current function and the in put is out of the setting s range E E E E appears on the display and CWn CWn CWn CWn or C C C C_d _d _d _d flashes...

Page 20: ...lay temperatures up to 999 C or 999 F WARNING The thermocouple mod ule has not been evaluated by Under writers Laboratories Do not use the thermocouple to measure objects when the voltage is above 30...

Page 21: ...nge Measuring AC Voltage Riding on a DC Source Bias WARNING To avoid injury or dam age to your meter never try to mea sure an AC voltage that is riding on a DC source bias where the peak AC voltage ex...

Page 22: ...e maximum input limit for AC DC current measurement is 10A If you do not know the amount of current in the circuit you are measuring always connect the red test lead to 10A MAX 1 Rotate the function s...

Page 23: ...s to a source of voltage while the rotary function selector is set to 3 If necessary press SELECT until K or M appears to set the meter to measure resistance Note With no resistance con nected across...

Page 24: ...the meter to measure capaci tance by pressing SELECT nF or F appears Then repeatedly press RANGE if necessary to manually select the range you want 4 Attach the red test lead to the positive side of...

Page 25: ...does not sound if the cir cuit resistance is greater than about 50 ohms meaning the cir cuit is not continuous CHECKING DIODES This procedure lets you check diodes transistors and other semiconductors...

Page 26: ...nnect the black test lead to the oth er side then measure and note the voltage Then reverse the test leads and measure and note the second reading The side of the diode where the meter shows a higher...

Page 27: ...C voltage with a DC source bias set the function selector to dBm V Otherwise set the function selec tor to C F V Note If the function selector is set to dBm V and you want to set the meter for maximum...

Page 28: ...he device you want to check in series MEASURING hFE You can use the meter to measure the DC gain of small signal bipolar transistors in the hFE range of 1000 Caution To avoid damaging the meter do not...

Page 29: ...on your computer 1 Turn on your computer and start the installed Windows operating system Windows 95 Windows 98 Windows ME or Windows 2000 2 Insert the software CD into your CD ROM drive The CD start...

Page 30: ...ur computer start the Meter View program by clicking the Start linkage icon or pulling down Run then clicking Start The Meter View software starts The display you see on the meter also appears on your...

Page 31: ...c tion selector to OFF to turn it off Then disconnect the test leads if they are connected WARNING To avoid electric shock you must disconnect the test leads before you remove the battery cover and ba...

Page 32: ...nt of a product defect during the warranty period take the product and the RadioShack sales receipt as proof of purchase date to any RadioShack store RadioShack will at its option unless otherwise pro...

Reviews: