Fluke ScopeMeter 190B Series Manuale utente
4822 872 00741
Nov. 2002, Rev.1 3/04
© 2002 , 2003 Fluke Corporation. All rights reserved.
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.
S
T
8
72
3
TR190-50R
or
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.
-
16
+8
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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