Fluke ScopeMeter 190B Series Manual de usuario

4822 872 00741

Nov. 2002, Rev.1 3/04

All product names are trademarks of their respective companies.

Fluke 190B/C

Medical Functions

Users Manual Supplement

Table of Contents

Chapter Title Page

1 General.......................................................................................................................... 1-1

About this Manual .......................................................................................................... 1-1

Safety Information .......................................................................................................... 1-1

Limited Warranty, Limitation of Liability......................................................................... 1-1

About the Medical Version ............................................................................................. 1-2

MA 190 Accessory Kit .................................................................................................... 1-2

2 Using the Medical Functions....................................................................................... 2-1

mAs Measurements ....................................................................................................... 2-1

mVs measurements ................................................................................................. 2-3

mWs measurements ................................................................................................. 2-3

Extended Offset ............................................................................................................. 2-4

Oscilloscopes and dynamic range............................................................................. 2-5

Triggering .................................................................................................................. 2-6

Tip for video signal measurements............................................................................ 2-6

Specifications ............................................................................................................ 2-6

Smart Average ............................................................................................................... 2-7

Smart average vs. normal average ........................................................................... 2-8

Non Interlaced Video Triggering..................................................................................... 2-9

1-1

Chapter 1

General

About this Manual

This manual supplement is an addition to the Users

Manual that is included with the ScopeMeter 190B/C

series test tool kit.

It provides user information about the extended test tool

functionality that isavailable in the Fluke190B/C/M

versions.

Safety Information

Read and comply with the safety instructions that you find

in the ScopeMeter 190B/Cseries Getting Started Manual

and Users Manual.

The MA 190 kit accessories are intended for low voltage

(42 Vpk) use only, and do not comply with the voltage

rating on most other ScopeMeter accessories. Carefully

read the warning below which is an explicit addition to the

general accessory and ScopeMeter safety statements.

Warning

To avoid electrical shock or fire, do NOT

connect the following accessories to voltages

more than 42 Vpk (30 Vrms) or circuits of

more than 4800 VA :

•CS 190-1R, 1 Ohm shunt resistor

•TR 190-50R, 50 Ohm terminator

•TA 190-50R, 50 Ohm terminator / 10:1

attenuator

Limited Warranty, Limitation of Liability

Read the Warranty and Limitation of Liability statements

that you find in the ScopeMeter 190B/CUsers Manual that

is included in the test tool kit shipment (on CD).

Fluke 190B/CMedical

User Manual

1-2

About the Medical Version

The /M Medical version isa standard Fluke 190B/CSeries

ScopeMeter test tool with the following additional

functionality:

•mAs measurements

•non interlaced video triggering

•smart averaging

•extended offset

MA 190 Accessory Kit

The MA 190 is an optional accessory kit that provides

optimal connectivity to the ScopeMeter test tool in medical

and video applications.

Before use carefully read the WARNING on page 1-1.

The kit contains:

•TR 190-50R, 50 Ohm BNC feed-through terminator for

video and HF measurements (Max. 5 V) . See Fig. 1-1.

•TA 190-50R, 50 Ohm 10:1 attenuator feed-through

terminator for additional dynamic range and offset. See

Fig. 1-1.

•CS 190-1R, 1 Ohm current shunt for sensitive current

and mAs measurements. (Max. 500 mA) . See Fig. 2-1.

•Safety designed 50 Ohm BNC cable with isolated plastic

connectors. (1.5 m)

•Female BNC to male 4 mm banana plug adapter

•Two female to female 4 mm banana plug adapters

Note 1

The CS 190-1R, the TR 190-50R, and the

TA 190-50R are not available as individual

accessory, but only as part of the MA 190 kit.

TR190-50R

TA190-50R

50 BNC CABLE

Ω

VIDEO

SIGNAL

SOURCE

Figure 1-1. 50 Ohm cable termination using the

TR190-50R or TA190-50R

2-1

Chapter 2

Using the Medical Functions

mAs Measurements

The mAs function allows you to make mAs (milliampere x

seconds) cursor measurements on input A or input B. You

can do this on live waveforms, frozen waveforms (HOLD),

recorded waveforms, and on saved waveforms.

To perform mAs measurements on input A, do the

following:

1Connect the current shunt CS190-1R to input A

using the BNC cable (see Figure 2-1)

2Connect the current shunt resistor CS 190-1R to

the current source using the BNC to banana

adapter (see Figure 2-1)

ST8722

CS190-1R

RED

BLACK

50 BNC CABLE

Ω

I in

I out

Figure 2-1. mAs measurement

Fluke 190B/CMedical

User Manual

2-2

3Display the SCOPE key labels

4Open the Reading 1 menu

5Select on A, then accept

6Select mAs, then accept. This

opens the Current Probe menu.

7Select for example 1 V/A, then

accept.

After closing the information banner the screen shows

(see figure 2-2) :

•Top left reading, mA (or A, µA, etc.):

the difference between the current amplitude measured

on the left cursor and measured on the right cursor:

•Top right reading, mAs (or As, µAs, etc.):

the integrated current over the time between the

cursors.

Figure 2-2. mAs measurement screen

Note: the B versions F3 key label does not show RMS as

these versions do not provide RMS measurements

on the trace section between the cursors.

8Highlight the left or right cursor.

9Move the highlighted cursor to the

desired position on the waveform.

Using the Medical Functions

mAs Measurements 2

2-3

From step 2, you can also proceed as follows to do mAs

measurements on input A:

3In Scope mode display the INPUT

Akey labels.

4Open the Probe on A menu.

5Select Probe Type: Current,

then accept.

6Select for example 1 V/A, then

accept.

7Display the cursor key labels (B-

and C-versions are different).

8Press to highlight . Observe

that two vertical cursors are

displayed.

9Press to highlight mAs.

10 Highlight the left or right cursor.

11 Move the highlighted cursor to the

desired position on the waveform.

mVs measurements

When you select Voltage in the Probe on A (B) menu,

the F3 key label shows mVs.

mWs measurements

When you are in the Math AxB mode, and you select in

the Probe on A (B) menu for one channel Voltage and for

the other channel Current, the F3 key label will show

mWs.

Fluke 190B/CMedical

User Manual

2-4

Extended Offset

The extended offset function enlarges the vertical trace

positioning range for input A and input B to 16 divisions

(maximum). This allows you to zoom-in vertically to study

small details of the signal.

To choose the extended offset range for input A do the

following:

1Display the INPUT A key labels.

2Open the INPUT A menu.

3(2x) Jump to Offset range.

4Select Extended and accept the

extended offset range.

To move the trace:

5Move the trace up or down until

the ground marker ( -) hits the

top - or bottom grid line.

When moving down, the following banner will show up:

Figure 2-3. Extended offset banner

When moving up a similar banner shows up.

Using the Medical Functions

Extended Offset 2

2-5

Oscilloscopes and dynamic range

To prevent waveforms from being distorted, in particular

signals with large very steep edges, the signal should stay

within the dynamic range, just as with any Oscilloscope.

The dynamic range limits are the same as the trace offset

limits given in the section Specifications below.

In practice you must take care when using high time base

speeds when looking at signals that have large very steep

edges. They can be distorted when they jump from

outside the dynamic range directly to the visible area of

the screen.

Figure 2-4 shows a pulse wave within the dynamic range

(left), and a pulse wave that is partially outside the

dynamic range (right). The example, particularly the

16 div trace offset, applies to one of the 5 most sensitive

ranges.

Trace offset limits (= dynamic range)

Ground marker position example

Avoid this for

steep edges

Figure 2-4. Max. trace offset lowest ranges

Fluke 190B/CMedical

User Manual

2-6

Triggering

The extended offset range allows you to shift the signal up

and down. Be aware that only the “visible” part is sampled

by the ADC, and that the trigger level has to stay in the

visible area too. Depending on what you are looking for, it

might be required to switch to Edge Trigger or to

time-qualified Pulse Trigger mode.

Tip for video signal measurements

To gain full profit of the Extended Offset for video signal

measurements:

•use the 50 Ω10:1 attenuator feed-through terminator

•select Probe on A attenuation 10:1

•select range 500 mV/d

Now you can move the trace down for 16 divisions.

Specifications

Maximum trace offset with respect to center screen:

Vertical ranges 2 mV to 50 mV/div (direct 1:1):

positive going signals ...................................... -16 div

negative going signals ................................... +10 div

Other vertical ranges:

positive going signals ........................................ -8 div

negative going signals ..................................... +8 div

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