Amprobe BDM40-UA User Manual

BDM40-UA

Bench Digital Multimeter

User Manual

BDM40-UA

Bench Digital Multimeter

User Manual

PN 1675449
March 2007
©2007 Amprobe Test Tools.
All rights reserved. Printed in Taiwan

1

Limited Warranty and Limitation of Liability

Your Amprobe product will be free from defects in material and workmanship for 1 year from the date of
purchase. This warranty does not cover fuses, disposable batteries or damage from accident, neglect, misuse,
alteration, contamination, or abnormal conditions of operation or handling. Resellers are not authorized to extend
any other warranty on Amprobe’s behalf. To obtain service during the warranty period, return the product with
proof of purchase to an authorized Amprobe Test Tools Service Center or to an Amprobe dealer or distributor. See
Repair Section for details. THIS WARRANTY IS YOUR ONLY REMEDY. ALL OTHER WARRANTIES - WHETHER
EXPRESS, IMPLIED OR STAUTORY - INCLUDING IMPLIED WARRANTIES OF FITNESS FOR A PARTICULAR
PURPOSE OR MERCHANTABILITY, ARE HEREBY DISCLAIMED. MANUFACTURER SHALL NOT BE LIABLE FOR
ANY SPECIAL, INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES OR LOSSES, ARISING FROM ANY
CAUSE OR THEORY. Since some states or countries do not allow the exclusion or limitation of an implied
warranty or of incidental or consequential damages, this limitation of liability may not apply to you.

2

CONTENTS

CERTIFICATIONS AND PRECAUTIONS............................................................. 3

SYMBOLS USED IN THIS MANUAL .................................................................... 3

FOR UNITED KINGDOM ONLY............................................................................ 4

INTRODUCTION ................................................................................................... 4

UNPACKING YOUR INSTRUMENT ..................................................................... 5

GETTING ACQUAINTED ...................................................................................... 5

USING YOUR METER .......................................................................................... 5

OPERATING GUIDELINES................................................................................... 7

MEASUREMENT TECHNIQUES.......................................................................... 8

VOLTAGE MEASUREMENTS ............................................................................ 10

CURRENT MEASUREMENTS............................................................................ 14

RESISTANCE MEASUREMENTS ...................................................................... 15

DIODE MEASUREMENT .................................................................................... 16

MAINTENANCE AND REPAIR ........................................................................... 22

SPECIFICATIONS............................................................................................... 24

OPTIONAL ACCESSORIES ............................................................................... 27

CERTIFICATIONS AND PRECAUTIONS

This instrument is EN61010-1 certified for Installation Category I -1200V; Pollution Degree II, Class 2. It may only
be used to make measurements on energy limited circuits within equipment. All inputs are protected against
continuous overload conditions up to the limits of each function's stated input protection (see specifications).
Never exceed these limits or the ratings marked on the instrument itself. Always inspect your Multimeter, test
leads and accessories for signs of damage or abnormality before every use. If an abnormal condition exists
(broken or damaged test leads, cracked case, display not reading, etc.), do not use. Never ground yourself when
taking measurements. Do not touch exposed metal pipes, outlets, fixtures, etc., which might be at ground
potential. Keep your body isolated from ground and never touch exposed wiring, connections, test probe tips, or
any live circuit conductors. Do not operate instrument in an explosive atmosphere (flammable gases, fumes,
vapor, dust.) Do not use this or any piece of test equipment without proper training.

SYMBOLS USED IN THIS MANUAL

Refer to the manual

W

Dangerous voltage

X

Double Insulation

T

Earth Ground

J

B

Alternating Current

F

Direct Current

Complies with EU

P

directives

G

Diode

3

This meter is shipped with two power cords. The 117/230 volts
power switch on the rear panel has been set to 230 volts and the

0.08A fuse installed.

Please verify the switch and fuse for your location before
installing the power cord
To change to 117 V operation, install proper fuse at back panel
(see manual) and set switch to 117V.

This instrument is shipped configured for 230 volt operation. Operation at 117 VAC requires that the fuse be
changed and the proper power cord used.

FOR UNITED KINGDOM ONLY

NOTE: This lead/appliance must only be wired by competent persons

WARNING: THIS APPLIANCE MUST BE EARTHED

IMPORTANT: The wires in this lead are coloured in accordance with the following code:

Green/ Yellow: Earth

Blue: Neutral

Brown: Live (Phase)

As the colours of the wires in main leads may not correspond with the colours marking identified in your
plug/appliance, proceed as follows: The wire which is coloured Green & Yellow must be connected to the Earth

terminal marked with the letter E or by the earth symbol
which is coloured Blue must be connected to the terminal which is marked with the letter N or coloured Blue or
Black. The wire which is coloured Brown must be connected to the terminal marked with the letter L or P or
coloured Brown or Red. If in doubt, consult the instructions provided with the equipment or contact the supplier.
This cable/appliance should be protected by a suitably rated and approved HBC mains fuse: refer to the rating
information on the equipment and/or user instructions for details. As a guide, cable of 0.75 mm should be
protected by a 3A or 5A fuse. Larger conductors would normally require 13A types, depending on the connection
method used. Any moulded mains connector that requires removal / replacement must be destroyed by removal
of any fuse & fuse carrier and disposed of immediately, as a plug with bared wires is hazardous if engaged in live
socket. Any re-wiring must be carried out in accordance with the information detailed on this instruction.

E

L

N

or coloured Green or Green & Yellow. The wire

INTRODUCTION

This instrument is a line powered, bench-type digital multimeter with a 4-1/2 digit LED display. The DMM can
measure AC/DC volts, AC/DC current, and resistance. Among other features:

• True RMS Measurements of AC or AC+DC Signals : True RMS measurement is the only accurate way to

directly measure AC or AC+DC signals that are not noise-free pure sine waves. This instrument measures AC
voltage frequencies up to 50 kHz.

• Five measurement functions :

• AC and DC VOLTS: Standard linear voltage measurements from 10 µV to 1200 VDC and 10 mV to

1000 VAC or AC+DC true rms.

4

• AC and DC Current: Standard current measurements from 10 nA to 20 ADC and 10 µA to 20 AAC or
AC+DC true rms.

• Resistance: Standard resistance measurements from 10 mΩ to 20 MΩ.

• Each measurement range has: Autopolarity operation. Overrange indication. Effective protection from

overloads and transients. Dual slope integration measurement technique to insure fast, accurate,
noise-free measurements.

• Diode test: Ranges of the resistance function that will turn on PN junctions allowing testing of diodes
and transistors. These ranges are marked with a diode symbol on the front panel of your DMM. The
preferred 2kΩ range is marked with the largest diode symbol.

• Improved test leads: Finger guards on the probes and shrouded contacts on the input terminals decrease

the possibility of accidental contact with circuit voltage.

• Long-term calibration accuracy: 1-year.

UNPACKING YOUR INSTRUMENT

The shipping box should contain this manual, your multimeter, test leads (one red and one black), two spare
fuses (2A); two spare fuses 0.08A (230V) and 0.125A (117V), and 2 power cords (1 - 115V and 1- 230V ). Check
the shipment for damage.

W CAUTION

This meter has dual operating voltages. It can be operated from 117VAC or 230VAC
source. The unit is shipped in the 230VAC configuration with an 0.08A / 250 V fuse
installed. If you plan to use the BDM40-UA on a 117 V source, unplug the power cord,
switch to the 0.125A / 250V fuse (supplied with instrument), and set the rear panel
switch to 117V.

If the meter maybe damaged if is not setup properly for the source voltage being used.

The label on the top side of your instrument is marked with the line voltage and
frequency required for proper operation. Refer to Maintenance section if a change in the
input power configuration is desired.

GETTING ACQUAINTED

Your meter is light-weight with a low profile, and requires little space on the work bench. The black case is made
of rugged, high-impact plastic. The handle can be rotated to eight positions. The right side of your DMM contains
two rows of switches and LED display. The power cord receptacle is located on the rear panel of your DMM. The
meter inputs are the 4 inputs on the front panel and are marked for the functions.

USING YOUR METER

The following paragraphs describe each of the controls on your DMM and how these controls can be used for
each instrument function. Exercises are included to help you familiarize yourself with your DMM and to verify that
your instrument is functional.

The LED Display

The high-contrast 4-1/2 digit LED display is easily read from across the room. It can register from 0000 to 19999
counts. For ease of discussion, the 19999 will be rounded to 20000 in the remainder of this text. For example, we
will refer to the 2V range, not the 1.9999V range. In all linear functions, the decimal point position is determined
by the range selected. Polarity of the input signal is indicated by a ‘ – ‘ sign at the center of the left side of the LED.
The + sign is disabled in the AC V, AC mA, and kΩ measurement functions. The ‘ – ‘ sign may appear in any
measurement function, but is normally not meaningful when making AC V, AC mA, and kΩ measurements. You

5

will only get this indication of an energized circuit if the power in the circuit is negative with respect to the
COMMON input terminal. If the power in the circuit is positive with respect to the COMMON input terminal, an
erroneous resistance will be displayed. If there is any doubt about whether there is energy remaining in the circuit
you are reading, read the resistance, then reverse the test lead positions. If the minus sign is displayed in either
case, the remaining energy must be removed from the circuit before correct resistance readings can be made. If
you apply an input signal that exceeds the limits of the range selected, the LED display will flash. All decimal point
positions appear in the display to indicate certain illegal combinations of front panel switch settings. For example,
if you select the DCV function and the 20M range, all four decimal points will appear on the display.

POWER Switch

The green POWER switch is located in the right corner of the DMM front panel. To turn the meter ON, push the
POWER button in. To turn the meter OFF, push the POWER button in.

CAT I
1200V

DC 1200V
AC 1000V

500V
MAX

20 A

20A MA X

TRUE

BDM40-UA

RMS

AC

DC

200mV 2 20 200

200u A 2mA 20mA 200m A 2A 20A

200 2k

1000VAC
1200VDC

20k 2 00k 2M 2 0M

POWER

mA-2A

2A MA X

V

COM

A

B

C

D

E

F

G

H

I

AC MAINS SELECTOR

117 V 230 V

MAINS SUPPL Y FUSE

117 VAC F 0.125 A / 250V
230 VAC F 0.08 A / 250 V

15 VA MAX 50 Hz / 60 Hz

117 VAC 105 VA C - 128 VA C
230 VAC 210 VA C - 257 VA C

WARNING

TO AVOID ELECTRICAL SHOCK
DISCONNECT TEST LEADS AND
POWER CORD BEFORE REMOVING
COVER.
DO NOT OPERATE INSTRUMENT
WITH COVER REMOVED.
TO PREVENT FIRE, REPLACE FUSE
WITH SA ME AND RA TING

MADE IN TAIWAN

SERIAL NO.

Voltage, Ohms, Diode and COM inputs.

Current (mA to 2A) and 20A inputs.

Reading display 0000 to 19999.

Power button (green).

Range selection switches. The pushbuttons are interlocked with the other ranges.

Function selection switches. The pushbuttons are interlocked with the other two white
function selection switches A and Ω.

Line Power connector.

Line Voltage selector switch.

Line Power Fuse.

Figure 1: BDM40-UA Controls

6

OPERATING GUIDELINES

To use your multimeter fully, there are some additional factors to be considered, such as measurement
techniques, the maximum signal input levels that will not damage your instrument, and common applications.

Operating Notes

The operating notes present the capabilities and limitations of this instrument and routine operator maintenance
instructions. Everyone using an DMM should be familiar with the operating notes.

Input Overload Protection

Exceeding the maximum input overload limits can damage your instrument. The
transient overload protection circuit is intended to protect against short duration high
energy pulses. The components used limit the protection to approximately five pulses
per second for 6kV - 10 microsecond pulses, and about 0.6 watts average for lower
amplitude pulses .

Each measurement function is equipped with input overload protection. Table 1 lists the overload limits for each
function.

Input Connections to Common

TO AVOID ELECTRICAL SHOCK AND/OR INSTRUMENT DAMAGE, DO NOT CONNECT THE
COMMON INPUT TERMINAL TO ANY SOURCE OF MORE THAN 500 VOLTS DC OR PEAK
AC ABOVE EARTH GROUND

This instrument may be operated with the common input terminal at a potential of up to 500V dc or ac peak with
respect to earth ground. If this limit is exceeded, instrument damage or an operator safety hazard may Occur.

W CAUTION

WX WARNING

Operating Power

This instrument is available in a universal version that uses 117V or 230V AC at 47 to 440Hz

Table 1. Maximum Input Signal Limits

FUNCTION
SELECTED

DC ALL RANGES 1200VDC or Peak AC

V

AC

2A Fuse protected: F 2A / 250V

DC or
AC

20A

kΩ ALL RANGES

RANGE SELECTED

20V, 200V, 1000V 1000VDC or Peak AC

200mV, 2V

ALL RANGES

INPUT

TERMINALS

V / Ω and

COMMON

mA / 20A and

COMMON

V / Ω and

COMMON

MAXIMUM INPUT OVERLOAD

1000Vrms for no longer than 15 sec.

Not fused

250VDC or VAC rms

7

MEASUREMENT TECHNIQUES

The information provided here describes techniques in measurement and interpretation of measurements that
may extend the usefulness of your DMM. These techniques, common throughout the electronics industry, have
been tailored specifically for this instrument.

AC Measurement Techniques

When making precise measurements of AC signals, there are special parameters that must be considered such as
the type of AC converter the meter uses (average, rms, etc.), crest factor, bandwidth, noise, etc.

True RMS

In order to compare dissimilar waveforms, calculate Ohm's law statements or power relationships, you must
know the effective value of a signal. If it is a DC signal, the effective value equals the DC level. If the signal is AC,
however, we have to use the root mean square or rms value. The rms value of an AC current or AC voltage is
defined as being numerically equal to the DC current or voltage that produces the same heating effect in a given
resistance that the ac current or voltage produces.

In the past, average responding converters were the type of converter most widely used. Theoretically, the rms

value of a pure sine wave is

meters converted to the average value, the rms value was

2 / 1 of the peak value and the average value is 2 / pi of the peak value. Since the

pi / 22 / 1 ÷ = )2 (2 / pi = 1.11 of the average

value when measuring a sine wave. Most meters used an average responding converter and multiplied by 1.11 to
present true rms measurements of sine waves. As the signal being measured deviated from a pure sine wave, the
errors in measurement rose sharply. Signals such as square waves, mixed frequencies, white noise, modulated
signals, etc., could not be accurately measured. Rough correction factors could be calculated for ideal waveforms
if the signal being measured was distortion free, noise-free, and a standard waveform. The true rms converter in
your meter provides direct, accurate measurement of these and other signals. Since this DMM is AC and DC
coupled, refer to the section on Voltage Measurement Techniques for combined AC and DC signal measurements.

Crest Factor

Crest factor range is one of the parameters used to describe the dynamic range of a voltmeter's amplifiers. The
crest factor of a waveform is the ratio of the peak to the rms voltage. In waveforms where the positive and
negative half cycles have different peak voltages, the higher voltage is used in computing crest factor. Crest
factors start at 1.0 for a square wave (peak voltage equals rms voltage).

FREQENCIES

SQUARE

WAVE

SINE WAVE

TRIANGLE

SAWTOOTH

MIXED

CREST FACTORWAVE FORM

1.0

1.414

1.732

1.414 to 2.0

Figure 2 Crest Factors

SCR OUTPUT

WHITE NOISE

AC COUPLED
PULSE TRAIN

8

SPIKE

CREST FACTORWAVE FORM

1.414 to 3.0

3.0 to 4.0

3.0

> 9.0

Your instrument has a crest factor range of 1.0 to 3.0 at full scale. Going down from full-scale, the crest factor
capability increases from 3.0 to: Full-Scale x 3

(i.e. 6 at half-scale) RMS Value , If an input signal has a crest factor
of 3.0 or less, voltage measurements will not be in error due to dynamic range limitations at full-scale. If the crest
factor of a waveform is not known, and you wish to know if it falls within the crest factor of your meter, measure
the signal with both your meter and an ac coupled oscilloscope. If the rms reading on your meter is 1/3 of the
peak voltage on the waveform or less, then the crest is 3.0. For readings at less than full-scale, use the preceding
formula to determine the maximum crest factor. At half-scale the maximum crest factor is: 2 x 3

= 1

The waveforms in Figure 2 show signals with increasing values of crest factor. As you can see from the series of
waveforms, a signal with a crest factor above 3.0 is unusual.

For an ac coupled pulse train: Crest Factor =

1)D/1( −

Where D = duty cycle or the ratio of pulse width to cycle length. Reversing this formula, we find that your meter
can accurately measure pulse trains at full-scale with a duty cycle above 10% without being limited by crest
factor.

1(1/D)3.0Factor Crest −== : 1-(1/D) 9.0 = : 1/D 10.0 =

Bandwidth

Bandwidth defines the range of frequencies where the response of the voltmeter's amplifiers is no more than 3 dB
down (half-power levels). Your instrument has a bandwidth of greater than 200kHz.

Slew rate

Slew rate is also called the rate limit or the voltage velocity limit. It defines the maximum rate of change of the
output of the amplifiers for a large input signal. Slew rate limitations are not a factor in measuring voltages within
specified frequencies and amplitude limits of this DMM.

Rise and fall time effect on accuracy

The rise and fall time of a waveform are the length of time it takes a waveform to change between the points that
are 10% and 90% of the peak value. When discussing these periods, we'll only mention rise time. Errors due to
rise to fall time can be caused either by bandwidth or slew rate limitations. Slew rate should not affect your
measurement with this DMM.

Ideal

t

1 + t0

t

1

Distortion

A

t

0

T

Components

Figure 3 Waveform Distortion

An approximate way of converting bandwidth to rise time limit is to divide 0.35 by the 3 dB down frequency. For
your instrument this will be 0.35/200kHz = 1.75 µsec. The following example will help you calculate errors due to
this limitation when measuring rectangular pulses. These calculations will be rough because ideal waveforms are
used in the analysis.

Ideally, the rectangular pulses would have zero rise and fall time and would be the right angled waveform shown
in Figure 3. In practice, every waveform has a rise and fall time and looks more like the waveform in Figure 3.
When calculating the error caused by the bandwidth of your Instrument, we will assume that the rise and fall time

DC Level DC Level

DC Level

t

1

1.75usec

50usec

A

48.25
usec

100usec

Example

1.75usec

DC Level

9

equals the slew rate of 1.75 µsec. To do this we will calculate the values for the theoretical signal with zero rise
and fall time, then calculate the values for a signal with the same period but with total slope periods equal to 1.75
µsec. A comparison of the results will show the measurement error due to the finite bandwidth. Using Figure 3 for
a reference, the total rms and DC levels are :

A rms TotalV

=

Since we can calculate two values, to find what your meter measures, use the formula:

Let's look at the waveform in Figure 3. When using your meter to measure the AC component of the signal, the
display will indicate the rms value of the AC signal riding on the DC level. (This DC level is the average value of the
waveform relation to the baseline.) The total rms value of the waveform can be calculated using the relationship:

For our example let's use a 10kHz pulse train of 50 µsec pulses with a peak value of 1 V. Ideally, the pulses would
have a zero rise time as shown in Figure 3.

rms TotalV ===

=

050

+

DCV ==

=

100

(0.707) rms V AC ==−=−=

When the maximum distortion in rise time of 1.75 µsec is assumed, the signal becomes the isosceles trapezoid
waveform shown in Figure 3. In this case:

rms TotalV ===

=

DCV ==

+

=

100

(0.703) rms V AC ==−=−=

50

100

1.7548.25

rms) total(V rms VAC −=

rms) (VAC rms TotalV +=

+

3(100)

2

3(100)

2

T 3

2

2(0)3(50)

0.5

(0.5)

50

100

(0.5)

DC)(V

2

2

2(1.75)3(48.25)

+

0.5

2

DC)(V

150

300

=

2

2

=

t 2

t 3

+

1

0

A DC V

300

t0t

+

1

T

0.707 0.5

0.50.250.250.50

148.25

3.5144.75

+

300

0.4940.2440.250.494

0.7030.494

Note that the V DC stayed the same. So, the errors are:

V total rms: = -0.6%: V AC rms: = -1.2%

VOLTAGE MEASUREMENTS

Your DMM can make either linear voltage or AC + DC TRUE RMS voltage measurements. For both types of
measurements, plug the black test lead into the COMMON terminal and the red test lead into the V-

Ω terminal.

Linear Voltage Measurements

The controls and terminals used for making linear voltage measurements are located on the front panel. Starting
at the top left is the ACV/DCV switch. This pushbutton is interlocked with the other two white function selection
switches A and
selection switch is pushed, the DCV pushbutton will be released to the OUT position. Push the DCV switch to the
IN position.

Ω. If the DCV function switch is in the IN position (DCV selected), and any other function

10

The light grey area around the ACV / DCV switch is extended up and to the right to enclose the five range values of
the voltage function. Push the range switch immediately above the value to be measured. The range selection
switches are interlocked in the same manner as the function switches.

Perform the following procedure:

1.

If the test leads are not connected, plug them into your DMM: red test lead to the V-Ω terminal and

black to the COMMON terminal.

2.

Select the 0.2V range.

3.

Push the function switch to the DCV position.

4. With the POWER switch set to the OFF position, connect your DMM to a line power outlet rated at the
operating voltage and frequency of your instrument. Keep the probe tips apart, and not connected to a
circuit.

Push the POWER switch to the ON position. The LED should count down rapidly to a reading of

5.
< ± .0020.

6.

Select the ACV and 1000V range.

WX WARNING

LOCAL LINE VOLTAGE IS MEASURED IN THE FOLLOWING STEP. BE CAREFUL NOT TO
TOUCH THE PROBE TIPS WITH YOUR FINGERS OR TO ALLOW THE PROBE TIPS TO
TOUCH EACH OTHER.

7. Insert the probe tips of the test leads into the slots of a power outlet. The LED should display the true
local line voltage.

Push the DCV push-button switch. The LED should display near zero volts but there may be some

8.
residual dc voltage on the power line due to non-linear loads such as SCR light dimmers.

9.

Remove the test leads from the line power outlet.

Converting voltage measurements

Your instrument is one of a family of DMMs that actually measure the true rms value of an AC or AC + DC signal.
This is a feature that allows accurate measurement of common waveforms like distorted or mixed frequency sine
waves, square waves, sawtooth waves, noise, pulse trains (with a duty cycle of at least 10%), etc. In the past, the
methods used for AC measurement have introduced large errors in readings. Unfortunately, we've all grown used
to these erroneous voltage readings and depend upon them to indicate whether or not a piece of equipment is
working correctly. The data contained in Table 2 should help you convert between measurement methods.

11

AC COUPLED

INPUT

WAVEFORM

SINE

PK

0

RECTIFIED SINE
(FULL WAVE)

PK

0

RECTIFIED SINE
(HALF WAVE)

PK

0

SQUARE WAVE

PK

0

SQUARE WAVE
RECTIFIED

PK

0

PK - PK

PK - PK

PK - PK

PK - PK

PK - PK

PEAK VOLTAGES METERED VOLTAGE

AC COMPONENT ONLY

PK -

PK

0 - PK

RMS CAL

AC

TRUE RMS

DC

COMPONENT

ONLY

DC AND AC

TOTAL RMS

TRUE RMS =

ac + dc

2.828 1.414 1.000 0.000 0.000 1.000

1.414 1.414 0.421 0.435 0.900 1.000

2.000 2.000 0.764 0.771 0.636 1.000

2.000 1.000 1.110 1.000 0.000 1.000

1.414 1.414 0.785 0.707 0.707 1.000

22

RECTANGULAR
PULSE

PK

X

0

D = X / Y

K = D - D

TRIANGLE
SAWTOOTH

PK

0

* RMS CAL IS DISPLAYED VALUE FOR AVERAGE RESPONDING METERS TH AT ARE CALIBRATED TO
DISPLAY RMS FOR DINE W AVES
** Your Digital Multimeter

PK - PK

Y

2

PK - PK

2.000 2.000

3.464 1.732 .960 1.000 0.000 1.000

2.22
K

2 K 2 D 2 D

Table 2. Voltage Conversion

12

Circuit loading error

Connecting most voltmeters to a circuit may change the operating voltage of the circuit if it loads the circuit down.
As long as the circuit resistance (source impedance) is small compared to the input impedance of the meter, the
error is not significant. For example, when measuring voltage with your meter, as long as the source impedance is

Ω or less, the error will be ≤ .01 %. If circuit loading does present a problem, the percentage of error can be

1 k
calculated using the appropriate formula in Figure 4.

1. DC Voltage Measurements
Loading Error in % = 100 x Rs / (Rs + Rin)
Where: Rs = Source resistance in ohms of the circuit being measured.
Rin = Meter input resistance (1 x 10

AC Voltage Measurements

2.

7

ohms)

First determine input impedance as follows:

7

Zinπ+=

Where: Zin = effective input impedance
Rin = 10
Cin = 100 x 10

10

2

)FC2(1

7

ohms

-12

Farads
F= Frequency in Hz
Then determine source loading error as follows:

Loading Error in % = 100 x

ZinZsZs+
Where: Zs = Source impedance
Zin = input impedance

* Vector algebra required

Figure 4. Circuit Loading Error

Combined AC and DC signal measurements

The waveform shown in Figure 5 is a simple example of an AC signal riding on a DC level. To measure waveforms
such as these, first measure the rms value of the AC component using the AC function of your meter. Measure
the DC component using the DC function of your instrument. The relationship between the total rms value of the
waveform and the AC component and the DC component is:

22

AC COMPONENT

DC LEVEL

OV

component) (DCrms) component (ACTotal RMS +=

Figure 5. RMS Values

Insignificance of inherent meter offset

If you short the input of your meter while the AC voltage function is selected, you should have a reading of less
than 10 digits on the display. This small offset is caused by the action of amplifier noise and offset of the true rms

13

converter. This offset will not significantly affect any readings until you try to measure signals almost at the lower
limit of the meter. For example:

Given: An offset of 40 digits Given: An offset of 20 digits

0.40mV in 200 mV range 0.20mV in 200 mV range
Input signal = 10mV in 200 mV range Input signal = 10mV in 200 mV range

2

2

10rms Total +=

100.16 = 100.04 =

= 10.01 mV = 10.00 mV

The error will be about 0.01mV the error is not significant

0.4

0.16100 += 0.04100 +=

10rms Total +=

2

2

0.2

CURRENT MEASUREMENTS

All of the controls and terminals used to make current measurements are located on the front panel. The AC mA
and DC mA function switches determine the measurement function. The colored area around the 20A switch
extends up and to the right to enclose the six range values for the 20A measurement function. Push the range
switch immediately above the value to be measured.

As the colored areas around the terminals indicate, the red test lead should be plugged into the 2A or 20A terminal
and the black test lead should be plugged into the COMMON terminal.

WX WARNING

INSTRUMENT DAMAGE AND OPERATOR INJURY MAY RESULT IF THE FUSE BLOWS
WHILE CURRENT IS BEING MEASURED IN A CIRCUIT WHICH EXHIBITS AN OPEN
CIRCUIT VOLTAGE GREATER THAN 600 VOLTS.

Burden voltage error

When a meter is placed in series with a circuit to measure current, you may have to consider an error caused by
the voltage drop across the meter (in this case, across the protective fuses and current shunts). This voltage drop
is called burden voltage. The maximum full scale burden voltages for your instrument are: 0.3V for the four lowest
ranges, and 0.9V for the 2000mA, 20A ranges. These voltage drops can affect the accuracy of a current
measurement if the current source is unregulated and the resistance of the shunt and fuse represents a significant
part ( 1/ 1000 or more) of the source resistance. If burden voltage does present a problem, the percentage error
can be calculated using the formula below. This error can be minimized by selecting the highest current range that
provides the necessary resolution.

14

Calculating Burden Voltage Error

I

M

E

S

AMMETER SHUNT

E
R
I
E

Display reading expressed as a % of full scale

Maximum current error due to Burden Voltage

= Source voltage

s

= Load resistance + Source resistance

L

= Measured current (display reading in amps)

M

= Burden voltage (calculated) , i.e.,

B

times full scale burden voltage for selected range. See table.

RANGE F.S. BURDEN VOLTAGE

200µA to 200mA

2000mA

20A

R

L

E

B

0.3V max.

1V max.

2V max.

Reading

x(100

)

ScaleFull

E

B

x 100% in−=

E

E

S

B

=

I

E

−

M

B

x100 Ampsmilli in

E

E

−

B

S

Examples: Es = 14V, RL = 9Ω, IM = 1497.mA,

1497.0

E ===

x100

B

2000.0

749.

x 100=% in error Maximum

0.749V1.0 of 74.9%x1.0

749.

x 100=

749.14

251.13

%06.5=

Increase displayed current by 5.65% to obtain true current.

.749x1497

error Maximum

Ampsmilli in

=

−

1121.2

13.251

.74914

84.6mA

==

Increase displayed current by 84.6mA to obtain true current.

RESISTANCE MEASUREMENTS

The controls and terminals used to make resistance measurements are located on the front panel. The
measurement function is selected by pushing the k
function switch extends up and to the right enclosing the six range values for the resistance function. To select a
particular resistance range, push the range switch immediately above the value to be measured. Connect the test
leads; red to the V-

Ω terminal and black to the COMMON terminal.

Use the following procedure to familiarize yourself with the resistance function and to see how the range switches
affect decimal point position on the LED.

Ω switch to the IN position. The colored area enclosing the kΩ

15

1. With the test leads held apart, select the 2000 kΩ range. The LED should display an over range
indication (all digits are flashing).

Make a firm connection between the probe tips of the test leads. The LED should count down to 000.0.

2.

3.

Maintain a firm contact between the probe tips and sequentially select all ranges starting with the

Ω range. The decimal point for each should be as follows:

200

Range Display

200Ω

2 kΩ

20 k

Ω

200 k

Ω

2000 kΩ

20 M

Ω

*Display value will show lead resistance.

199.99*

1.9999*

19.999

199.99

1999.9

19.999

Automatic test lead compensation

When measuring low resistances, test lead resistance interferes with low resistance readings and usually has to
be subtracted from resistance measurements for accuracy.

DIODE MEASUREMENT

The five resistance ranges bar with a diode symbol beside the range value have a high enough measurement
voltage to turn on a silicon junction. These ranges can be used to check silicon diodes and transistors. The 2k
range is preferred. It is marked with the largest diode symbol.

Ω

CALIBRATION

WX WARNING

THESE SERVICING INSTRUCTIONS ARE FOR USE BY QUALIFIED PERSONNEL ONLY. TO
AVOID ELECTRICAL SHOCK, DO NOT PERFORM ANY SERVICING OTHER THAN THAT
CONTAINED IN THE OPERATING INSTRUCTIONS UNLESS YOU ARE QUALIFIED TO DO
SO.

Introduction

This section contains the maintenance information for this Digital Multimeter. This information is divided into
service information, general maintenance, a group of performance tests, a calibration adjustment procedure, and
troubleshooting. The performance tests are recommended as an acceptance check when the instrument is first
received and should be completed as necessary to verify that your DMM is operating within the specification
limits listed in SPECIFICATIONS Section. A calibration cycle of 1- year is recommended to maintain the
specifications given in SPECIFICATIONS Section of this manual. The test equipment required for both the
performance test and the calibration adjustment procedure is listed in Table 3. If the recommended test
equipment is not available, instruments having equivalent specifications may be used.

Service Information

This DMM is warranted for a period of 1-year upon delivery to the original purchaser. Conditions of the warranty
are given on the first page of this manual and Service instructions are in the Maintenance Section.

16

Cal Procedures

NOTE

To avoid contaminating the pcb with grease from the fingers, handle the pcb by its edges or wear gloves. If the
pcb does become contaminated, refer to the cleaning procedure given later in this section.

Table 3. Recommended Calibration

INSTRUMENT

TYPE

Calibrator DC Volts 0 to 1000V ± 0.006 %

AC Volts

100Hz

200Hz

1 kHz

10 kHz

20 kHz

Calibration
Leads

Calibration Access

Use the following procedure to gain access to the calibration adjustments of this DMM.

Set the POWER switch to the OFF position and remove the power cord plug from the receptacle in the

1.
rear of the instrument.

2.

Remove the Phillips screw from the Bottom of your DMM.

3.

Grasp the front panel and slide the instrument out of the case.

4.

Turn the instrument upside down as viewed from the front panel.

5.

All adjustments necessary to complete the calibration procedure are now accessible.

For reassembly, reverse the procedure (be careful to align the grooves in the sides of the front panel

6.
with the guides located inside the case and to bend the flexible interconnect inwards and out of the
way).

Main PCB Access

Use the following procedure to gain access to all the components and test points ON THE MAIN PCB ASSEMBLY
FOR TROUBLESHOOTING AND REPAIRING.

50 kHz

DC Current 0 to 2000mA ± 0.05 %

AC Current 0 to 19mA, 100 Hz ± 0.1 %

Resistance

24 “ shielded cable with a double banana plug at both ends Pomona 2BC-24

REQUIRED CHARACTERISTICS

0 to 750V

0 to 2V

0 to 750V

0 to 100V

0 to 100V

0 to 20V

Ω, 1 kΩ

100

10 kΩ, 100 kΩ

1M

Ω, 10MΩ

± 0.06 %

± 0.06 %

± 0.06 %

± 0.06 %

± 0.1 %

± 0.5 %

± 0.01 %

± 0.005 %

± 0.05 %

RECOMMENDED

MODEL

Fluke 5500

17

1. Complete the calibration access procedure.

2.

Remove the front panel using the following procedure:

a.

The V-Ω input line and the COMMON input line are attached to the front panel by a snap

connector. Unplug these lines.

b.

Slide the fuse spring forward to the edge of the slide panel.

c. Pull the wire up through the slot in the fuse holder barrel.

d.

Pull the spring and the fuse contact up through the hole in the fuse holder barrel.

e.

Reinstall the fuse and fuse holder.

f. Turn the instrument component-side-down.

g.

Carefully pull the front panel free of the switches.

3.

To install the Main PCB, reverse this procedure, being careful to install the PCBs and the shields in

their respective guides.

Display Access

Use the following procedure to remove or replace the LED:

1.

Carefully lay the display PCB to one side.

2.

Both the Main and Display PCBs should now be flat on your workbench, component-side-up.

3.

Tilt the Display PCB towards the Main PCB, and remove the shield plate connecting the Display PCB.

4. For reassembly, reverse this procedure.

Performance Tests

The performance tests are used to compare the performance of this instrument to the specifications listed in
Section 1 of this manual. If the instrument fails any portion of the performance tests, calibration and/or repair is
indicated. Throughout the tests, your DMM will be referred to as the UUT (Unit Under Test).

NOTE

Allow the UUT to warmup a minimum of 5 minutes and conduct the tests at an ambient temperature of 23 ± 5°c
(73 ± 9°f).

Display Test

Complete the following procedure to verify proper operation of the display annunciators and each segment of each
digit in the display:

1.

Select kΩ, 200Ω range with an open circuit input.

2. Verify that for over range indication, the LED will flash in all digit locations.

3.

Short the input, select each range listed in Table 4. and verify that the decimal point is positioned as

indicated.

Select DC V, 200V range.

4.

5.

Connect the DMM Calibrator to the UUT: HI to the V-Ω terminal and LO to the COMMON terminal.

6.

Apply + 188.88VDC and adjust the calibrator until the UUT displays + 188.88 exactly.

18

Table 4. Display Test

SELECT RANGE DISPLAY

200Ω

2kΩ

20kΩ

200kΩ

2000kΩ

20MΩ

*The least significant digit(s) may change by several digits from zero, depending on your test lead resistance.

Linear Voltage Test

Use the following procedure to verify the proper operation of both the AC and DC V functions:

1.

Select DC V, 200mV range.

2.

Connect the calibrator HI volts output to the V-Ω terminal and the calibrator LO volts output to the

COM terminal.

3.

For each step of Table 5, set the ACV/DCV switch to the indicated position, select the listed range,

program the calibrator for the corresponding input to the UUT, and verify that the UUT display value
lies within the indicated limits.

Table 5. Linear Voltage Test

00.00*

.0000*

0.000

00.00

000.0

0.000

STEP

1

2

3

4

5 20V +19VDC +18.990 to +19.010

6 200V +190V DC +189.90 to +190.10

7 1200V +1000VDC +999.3 to +1000.7

8

9

10

11

12

13

UUT SWITCH POSITIONS UUT INPUT

FUNCTION RANGE LEVEL FREQUENCY

200mV

2V

DCV

2V Short

AC V

200mV

2V 1.9VAC rms 100Hz 1.8890 to 1.9110

+190mVDC

-190mVDC

+1.9VDC

-1.9VDC

100 Hz

190mVAC rms

100mVAC rms 1kHz 99.35 to 100.65

10kHz

50kHz

DISPLAY READING

+189.90 to +190.10

-189.90 to -190.10

+18990 to +1.9010

-1.8990 to -1.9010

<.0020

188.90 to 191.10

188.90 to 191.10

180.20 to 199.80

19

14

15

16

17

18

19

20

21

Current Test

Use the following procedure to verify proper operation of both the AC and DC mA measurement functions:

1.

Select DC mA, 200µA range.

Connect the calibrator HI amps output to the V-Ω terminal and the calibrator LO amps output to the

2.
COM terminal.

For each step in Table 6, select the listed range, program the calibrator for the corresponding UUT

3.
input, and verify that the UUT display value lies within the indicated limits.

4.

Set the FUNCTION switch to the AC mA position and select the 20 mA range.

5. Program the calibrator for a UUT input of 19.000 mA rms at a frequency of 100 Hz.

6.

Verify that the UUT display value lies between 18.890 and 19.110.

20V 19VAC rms

200V

100V 1000VAC rms

190VAC rms

100VAC rms

10kHz

50kHz

100Hz

10kHz

50kHz

100Hz

10kHz

100Hz

1kHz

1.8890 to 1.9110

1.8020 to 1.9980

18.890 to 19.110

18.890 to 19.110

18.020 to 19.980

188.90 to 191.10

99.35 to 100.65

993.5 to 1006.5

993.5 to 1006.5

Table 6. Direct Current Test

STEP

1

2

3

4

5

6

Resistance Test

Use the following procedure to verify the accuracy of the k

1.

Select kΩ, 200Ω range.

2.

Connect the calibrator HI ohms output to the V-Ω terminal and the calibrator LO ohms output to the

COM terminal.

SELECT

RANGE

200µA

2mA

20mA

200mA

2000mA

20A

INPUT DISPLAY READING

190µA

1.9mA

19mA

190mA

1900mA

19A

189.61 to 190.39

1.8961 to 1.9039

18.961 to 19.039

189.61 to 190.39

1894.1 to 1905.9

18.941 to 19.059

Ω measurement function:

20

3. For each step in Table 7, select the listed range, program the calibrator for the corresponding input to
the UUT and verify that the UUT display is within the indicated limits.

Table 7. Resistance Test

STEP

1

2

3

4

5

6

7

SELECT

RANGE

200

Ω

200

Ω

2k

Ω

20kΩ

200k

2000k

20MΩ

Ω

INPUT DISPLAY READING

Short

100

Ω

1 k

Ω

10kΩ

100k

Ω

Ω

1000k

10MΩ

Ω

00.00 to 00.07

99.86 to 100.14

.9988 to 1.0012

9.988 to 10.012

99.88 to 10.012

997.3 to 1002.7

9.973 to 10.027

Calibration Adjustments

The calibration adjustment procedure should be used any time your instrument has been repaired or fails to pass
the Performance Test. Adjust R306A, R336A if U301, U308 are replaced or if VR302, VR304 do not have enough
adjustment range. Replace U501 if VR502 does not have enough adjustment range. The RMS Converter Offset
Adjustment should not normally need to be done. Adjust only if VR501 (AC) does not have enough adjustment
range or if the display reads .0010 or greater with AC V, 2V range selected and the input shorted.

NOTE Allow the UUT to warm up a minimum of 5 minutes and conduct the calibration at an ambient temperature
of 23 ± 5°C (73 ± 9 °F).

DC Voltage Calibration

On the UUT select DC V, 2V range, and connect the calibrator HI volts output to the V­calibrator LO volts output to the COM terminal. For each step in Table 8, select the listed range, program the
calibrator for the corresponding UUT input, and make the specified adjustment or check.

Ω terminal and the

Table 8. DC Calibration

Step Range Input Adjust Display Limits

200mV

1

2V

2

200mV

3

200V

4

1000V

5

Short

+ 1.9000V

+ 190.00mV

+ 190.00V

+ 1000.0V

VR303

VR302

VR304

VR202

VR203

Less than ± 00.04

+ 1.9000V exactly

+ 190.00mV exactly

+ 190.00V exactly

+ 1 000.0V exactly

21

Ohms Calibration

On the UUT select ‘
the calibrator LO ohms output. For each step in Table 9, select the listed range, program the calibrator for the
corresponding UUT input, and make the specified adjustment or check.

Step Range Input Adjust Display Limits

1

2

DC Current Calibration

On the UUT select DC, 20 A range, and connect the 20A terminal to the calibrator HI amps output and COM to the
calibrator LO amps output. For each step in Table 10, select the listed range, program the calibrator for the
corresponding UUT input, and make the specified adjustment or check.

1

2

3

AC Volts Calibration

On the UUT select AC only, 2 V range, and connect the V­the calibrator LO volts output. For each step in Table 11, select the listed range, program the calibrator for the
corresponding UUT input, and make the specified adjustment or check.

Ω ‘, 200Ω range, and connect the V-Ω terminal to the calibrator HI ohms output and COM to

Table 9. Ohms Calibration

20 MΩ

Ω

20 k

Step Range Input Adjust Display Limits

20 A

2 A (2000mA)

200 mA

10 M

Ω

Ω

10 k

Table 10. DC Current Calibration

+ 1.9 A

+ 1.9 A

+ 190.00 mA

VR402

VR401

VR206

VR205

VR204

Ω terminal to the calibrator HI volts output and COM to

9.995 to 10.005

9.998 to 10.002

+ 1.898 to 1.902

+ 1899.8 to 1900.2

+ 189.98 to 190.02

Table 11. AC Voltage Calibration

Step Range Input Freq. Adjust Display Limits

1 2V Short

2

3

4(a)

(b)

5(a)

(b)

2V 1.9000V 400Hz

200V

20V

1000v

20V

100.00V

19.000V

1000.0v

19.000V

1 kHz

10 kHz

1 kHz

10 kHz

VR501 Less than .0010

VR502

SVC202/203

SVC201

SVC202

SVC201

SVC203

1.8995 to 1.9005

ADJ to mechanical center

99.90 to 100.10

18.990 to 19.010

999.5 to 1000.5

18.990 to 19.010

MAINTENANCE AND REPAIR
Changing Input Power Configuration

This meter was shipped with power cords and fuses for 117V (USA) and 230V (European) operation. The initial
configuration is for 230V.

22

Fuse Replacement

This DMM has two fuses. The main power fuse is 0.08A or 0.125A, 250V for line protection. The current
measurement fuse is 2A / 250V for below 2A current measurements (unscrew the mA – 2A input jack).

117 Line Fuse T 0.125A / 250V Bussmann GDB-125mA Littel Fuse 218.125

230V Line Fuse T 0.08A / 250V Bussmann GDB-80mA Littel Fuse 218.080

2A Current Input Fuse F 2A / 250V Bussmann GMA-2A Littel Fuse 216.002

Maintenance

If there appears to be a malfunction during the operation of the Multimeter, the following steps should be
performed in order to isolate the cause of the problem: Review the operating instructions for possible mistakes in
operating procedure. Inspect and test the Test Cables for a broken or intermittent connection. Inspect and test the
fuse. See Fuse Replacement.

Cleaning

WCAUTION

DO NOT USE AROMATIC HYDROCARBONS OR CHLORINATED SOLVENTS FOR
CLEANING. THESE SOLUTIONS WILL REACT WITH THE PLASTIC MATERIALS USED IN
THE INSTRUMENT.

Clean the front panel and case with a mild solution of detergent and water. Clean dust from the circuit board with
clean, dry, low pressure air (20 psi or less). Contaminants can be removed from the PCB using demineralized
water and a soft brush (remove the display assembly before washing the Main PCB and avoid getting excess
amounts of water on the switches). Dry with clean, dry, low pressure air and then bake at 50 to 60°C (122 to
140°F) for 24 hours.

Repair

All test tools returned for warranty or non-warranty repair or for calibration should be accompanied by the
following: your name, company’s name, address, telephone number, and proof of purchase. Additionally, please
include a brief description of the problem or the service requested and include the test leads with the meter. Non­warranty repair or replacement charges should be remitted in the form of a check, a money order, credit card with
expiration date, or a purchase order made payable to Amprobe® Test Tools.

In-Warranty Repairs and Replacement – All Countries

Please read the warranty statement and check your battery before requesting repair. During the warranty period
any defective test tool can be returned to your Amprobe® Test Tools distributor for an exchange for the same or
like product. Please check the “Where to Buy” section on www.amprobe.com for a list of distributors near you.
Additionally, in the United States and Canada In-Warranty repair and replacement units can also be sent to a
Amprobe® Test Tools Service Center (see below for address).

23

Non-Warranty Repairs and Replacement – US and Canada

Non-warranty repairs in the United States and Canada should be sent to a Amprobe® Test Tools Service Center.
Call Amprobe® Test Tools or inquire at your point of purchase for current repair and replacement rates.

In USA In Canada

Amprobe Test Tools Amprobe Test Tools
Everett, WA 98203 Mississauga, ON L4Z 1X9
Tel: 877-AMPROBE (267-7623) Tel: [phone]

Non-Warranty Repairs and Replacement – Europe

European non-warranty units can be replaced by your Amprobe® Test Tools distributor for a nominal charge.
Please check the “Where to Buy” section on www.amprobe.com for a list of distributors near you.

European Correspondence Address*

Amprobe® Test Tools Europe
P.O. Box 1186
5602 BD Eindhoven
The Netherlands
*(Correspondence only – no repair or replacement available from this address. European customers please
contact your distributor.)

SPECIFICATIONS
General

Temperature Coefficient: < 0.1 times the applicable accuracy specification per oC for 0°C to 18°C and 28°C to

50°C (32°F to 64.4°F and 82,4°F to 122°F).

Operating Temperature: 0°C to 50°C (32°F to 122°F).

Storage Temperature: -10°C to +70°C (-14°F to + 158°F).

Relative Humidity: Up to 90%, 0°C to 35°C (32-95°F); up to 70%, 35°C to 50°C (95-122°F), except on 2000k

Ω, ranges: up to 80%, 0°C to 35°C (32-95°F).

and 20M

Environmental: Intended for Indoor use. Altitude up to 2000m.

Maximum Common Mode Voltage: 500VDC, or peak AC (low terminal potential with respect to power line

ground).

Size: 228 (W) x 80 (H) x 329 (D) mm.

Weight: 2.2Kg.

Power requirements:

Line Voltage: 105 to 128Vac @ 47 to 440Hz. or 210 to 257V AC @ 47 to 440Hz specified voltage.
Power Consumption: 15W max.

Safety: meets EN61010-1 Cat I - 1200V Class II, Pollution degree 2.

EMC: Meets EN61326-1

89/336/EEC (Electromagnetic Compatibility) and 73/23/EEC (Low Voltage) as amended by 93/68/EEC (CE
Marking). However, electrical noise or intense electromagnetic fields in the vicinity of the equipment may disturb
the measurement circuit. Measuring instruments will also respond to unwanted signals that may be present within
the measurement circuit. Users should exercise care and take appropriate precautions to avoid misleading results
when making measurements in the presence of electronic interference.

This product complies with requirements of the following European Community Directives:

Ω

24

Electrical

The electrical specifications apply for an operating temperature of 18°C to 28°C (64.4°F to 82.4°F), relative
humidity up to 90%, and a 1- year calibration cycle.

DC VOLTS:

RANGE RESOLUTION ACCURACY for 1 year

± 200 mV

± 2V

± 20V

± 200V

± 1000V

Input Impedance: 10M

Normal Mode Rejection Ratio: >60dB at 60Hz or >50dB at 50Hz.

Common Mode Rejection Ratio: >90 dB at dc, 50Hz or 60Hz (1 k

Common Mode Voltage (Maximum): 500V DC or peak AC.

Response Time to Rated Accuracy: 1 second maximum.

Maximum Input: 1200V DC or peak AC continuous (less than 10 seconds duration on both the 200mV and 2V

ranges).

AC VOLTS (True RMS Responding, AC or AC + DC):

Voltage Readout Accuracy: ± (% of reading + no. of digits), between 5% of range and full range.

INPUT

VOLTAGE

10mV-200mV

0.1V-2V

1V-20V 1mV 20V +15 +15 +15 +15 +15

10V-200V 10mV 200V

100V-1000V 100mV 1000V

** Typically 3 to 5 digits of rattle will be observed at full scale at 20Hz.

Ω in parallel with < 100pF, all ranges.

RESOL

UTION

10

μV

100

μV

10µV

100µV

1 mV

10mV

1000mV

Range 20Hz** 45Hz 1kHz 2kHz 10kHz 20kHz 50kHz

200mV

2V 1 % 0.5% 1% 2% 5%

± (0.03% of reading + 4 digits).

Ω unbalanced)

:

:

NOT SPECIFIED

25

DC CURRENT:

RANGE RESOLUTION ACCURACY for 1 Year VOLTAGE BURDEN

200µA

2mA

20mA

200mA

20A *

* Overload Protection: 5 ranges (200µA, 2mA, 20mA, 200mA, 2000mA), with fuse protection,
20A range, no fuse.

AC CURRENT (True RMS Responding, AC or AC+DC):

0.01 µA

0.1 µA

1 µA

10 µA

100 µA

1 mA

(0.2% of reading + 2 digits)

(0.3% of reading + 2 digits)

1 mV / 1

μA

100 mV / 1 mA

10 mV / 1 mA

1 mV / 1 mA

200 mV / 1 A 2000mA

14 mV / 1 A

INPUT

CURRENT

10µA -200µA .01µA 200µA

100µA -2mA 0.1 µA 2mA

1mA-20mA 1 µA 20mA 1% 0.5% 1% 2% 10 mV / 1 mA

10mA-200mA 10 µA 200mA +15 +15 +15 +15 1mV / 1 mA

100mA-2000mA

2000mA-20A 1 mA 20 A

* * Typically 3 to 5 digits of drift will be observed at full scale at 20Hz.

Crest Factor Range: Waveforms with a Peak / RMS ratio of 1:1 to 3:1 at full scale.

RESISTANCE

RANGE RESOLUTION ACCURACY for 1 Year

00Ω 0.01Ω

2kΩ

Ω

20k

Ω

200k

2000kΩ

Ω

20M

0.1

1

10

100

1k

ΩΩ

RESO-

LUTION

100

Ω

Ω

Ω

Ω

Range 20Hz** 45Hz 2kHz

2000m

μA

A

± (0.1% reading + 4 digits) 0.2V

± (0.1% reading + 4 digits)

± (0.25% reading + 4 digits)

10kHz -

20kHz

Not Specified 14mV / 1 A

FULL SCALE VOLTAGE ACROSS

UNKNOWN RESISTANCE

2V

2V

0.2V

2V

2V

VOLTAGE

BURDEN

1 mV / 1

100mV / 1 mA

200 mV / 1 A

μA

Overload Protection: 250V DC/AC rms on all ranges.

26

Response Time (To Rated Accuracy): 5 seconds maximum on 20MΩ range; 2 seconds maximum on all other
ranges.

Diode Test:

The 200, 2k, and 20k
back resistance. The 2k
instrument.

Maximum Input Signal Limits

FUNCTION
SELECTED

DC ALL RANGES 1200VDC or Peak AC

V

AC

2A Fuse protected: F 2A / 250V

DC or
AC

20A

kΩ ALL RANGES

Ω ranges have enough voltage to turn on silicon junctions to check for proper forward to

Ω range is preferred and is marked with a large diode symbol on the front panel of the

RANGE SELECTED INPUTTERMINALS MAXIMUM INPUT OVERLOAD

Ω and

20V, 200V, 1000V 1000VDC or Peak AC

200mV, 2V

ALL RANGES

V /

COMMON

mA / 20A and

COMMON

V / Ω and

COMMON

1000Vrms for no longer than 15 sec.

Not fused

250VDC or VAC rms

OPTIONAL ACCESSORIES

DL243D Basic Test Lead Set
DL248D Deluxe Test Lead Set
TL245A Standard Replacement Test Leads
TL36A Test leads with alligator clips
TC 253B Temperature Converter

27