RTI MAS-2 User manual

User's Manual - English - Version 2019.12A
RTI Electronics Inc.
33 Jacksonville Road, Bldg. 1,
Towaco, NJ 07082
USA
Phone: [phone] (Toll free)
Int. [phone]
Fax: Int. 1-973-439-0248
E-mail
Sales: [e-mail]
Support: [e-mail]
Service: [e-mail]
Web: http://www.rtigroup.com
Contact Information -
US Office
RTI Group AB
Flöjelbergsgatan 8 C
SE-431 37 MÖLNDAL
Sweden
Phone: Int. [phone]
Fax: Int. [phone]
E-mail
Sales: [e-mail]
Support: [e-mail]
Service: [e-mail]
Web: http://www.rtigroup.com
Contact Information -
World Headquarters
RTI Group AB reserves all rights to make changes in the RTI MAS-2 and the information
in this document w ithout prior notice.
RTI Electronics AB assumes no responsibility for any errors or consequential damages
that may result from the use or misinterpretation of any information contained in this
document.
Copyright © 2003-2019 by RTI Group AB. All rights reserved.
Content of this document may not be reproduced for any other purpose than supporting
the use of the product w ithout prior permission fromRTI.
Non-invasive Tube Current Probe
RTI MAS-2
for the RTI Meter

Contents
2
RTI MAS-2 User's Manual 2019.12A
Together w ith instruments fromRTI Group AB it is to be used for independent
service and quality control, as w ell as measurements of kerma, kerma rate, kVp,
tube current, exposure time, luminance, and illuminance w ithin limitations stated
below .
If installed according to accompanying documents, the product is intended to be
used together w ith all diagnostic X-ray equipment except for:
- therapeutical X-ray sources.
- X-ray equipment w ith tube potential below 20 kV.
- X-ray equipment on which the instrument cannot be mounted properly, e.g.
equipment where the beamfield size is narrow er than the active part of the
detector.
- specific types of X-ray equipment listed in the instructions for use or in additional
information fromthe manufacturer.
With the X-ray installation in stand-by conditions w ithout patients present, the
product is intended to be used:
- to provide the operator w ith information on radiation beamparameters that might
influence further steps in an examination but not an ongoing exposure.
- for assessing the performance of the X-ray equipment.
- for evaluation of examination techniques and procedures.
- for service and maintenance measurements.
- for quality control measurements.
- for educational purposes, authority supervision etc.
The product is intended to be used by hospital physicists, X-ray engineers,
manufacturer's service teams, and other professionals w ith similar tasks and
competencies. The operator needs a short training to be able to use the product as
intended. This training can be achieved either by careful study of the manual,
studies of the built-in help function in measurement softw are or, on request, in a
course provided by the manufacturer.
The product is intended to be used inside X-ray rooms ready for clinical use and
can safely be left sw itched on and in any measuring mode in the vicinity of
patients.
The product is NOT intended to be used:
- for direct control of diagnostic X-ray equipment performance during irradiation of
a patient.
- so that patients or other unqualified persons can change settings of operating
parameters during and immediately before and after measurements.
Intended Use of the RTI MAS-2

RTI MAS-2 User's Manual2019.12A
Contents 3
Table of Contents
............................................................................................................. 41. INTRODUCTION ..................................................................................................... 41.1 General
............................................................................................................. 52. FUNCTION AND CONNECTION
..................................................................................................... 52.1 Function of the RTI MAS-2
..................................................................................................... 52.2 Connection of the RTI MAS-2
..................................................................................................... 52.3 Initial Offset Adjustment Procedure
............................................................................................................. 63. MEASUREMENTS..................................................................................................... 63.1 Measurements of the mAs and mA value
............................................................................................................. 64. SAFETY PRECAUTIONS
..................................................................................................... 64.1 General Rules
............................................................................................................. 75. SPECIFICATIONS..................................................................................................... 75.1 General Specifications for RTI MAS-2
............................................................................................................. 8Index
For a full description of the RTI Meter, see the RTI Meter Reference Manual.
That Manual can be found on the Product USB or be downloaded from RTI's
website (www.rtigroup.com).
Note!

1. INTRODUCTION
General
RTI MAS-2 User's Manual 2019.12A
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1 INTRODUCTION
General1.1
The RTI MAS-2 is an adapter cable together with a current clamp probe for use with
RTI Meter X-ray multimeter. It provides a non-invasive way to measure tube current
(mA) and tube charge (mAs) on X-ray equipment. The current probe is simply
clamped on the high voltage lead and is then ready for measurements.
The advantage is that the method is easy to use and that it is safe. Furthermore there
is no need to disconnect the high voltage cables to be able to measure tube current.
The RTI MAS-2 can measure from 10 mAto 4000 mA, when used together with the
RTI Meter. By using Free-run or Timed update modes the RTI MAS-2 is able to
measure even lower, with an inaccuracy of 1 - 2 mA.
The calibration factor, stored in the cable connector, makes it possible to read current
and charge directly in mA and mAs with the RTI Meter. The mA waveform can also be
collected and displayed.
This method is preferred when adding an absolute mAs reference value for your mAs
linearitytest.
You can easilytransform your relative output measurement values to absolute mAs
values, even for low mAs measurements. A benefit with this method is that you avoid
large measurement errors for low mAs values. This is often the case with ordinary
mAs meters that are not sensitive to the current waveform.
Using the Ocean software, a certain portion of the mAwaveform can be selected
using the radiation waveform as reference.
The current clamp probe is also a general-purpose current meter, which can be used
together with an oscilloscope or DVM. Currents between 0 - 4 Ain the frequency range
DC to 1 kHzcan be measured.
The PROVA 15 current probe
The RTI MAS-2 adapter cable

2. FUNCTION AND CONNECTION
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5
2 FUNCTION AND CONNECTION
The overview of RTI Meter will be divided into three different main parts:
• Function: general overview.
• Connection: how to connect the probe and cable.
• Initial Offset Adjustment: shows how to do final adjustments before starting
to measure.
Function of the RTI MAS-22.1
The RTI MAS-2 is an adapter cable used together with a current clamp probe
and the RTI Meter electrometer.
The clamp probe is powered on with the range switch.
Connection of the RTI MAS-22.2
The RTI MAS-2 is connected to the detector input of the RTI Meter using the round
Lemo connector.
The clamp probe is connected using the two banana connectors in the other end of
the cable.
NOTE! Make all connections to the RTI MAS-2, the RTI Meter, and the clamp probe
before powering on the instruments. See figure below.
Connect to the RTI Meter.
Connect together
Initial Offset Adjustment Procedure2.3
Make sure that all instruments are switched off.
Press the jaw trigger and clamp the jaws onto the high voltage cable. Check for
correct polarity.
Connect the RTI MAS-2, the clamp probe, and the RTI Meter according to previous
figure.
Power on the clamp probe, and the RTI Meter.
Press the ZERO on the clamp probe to cancel internal DC offset in the clamp probe.

2. FUNCTION AND CONNECTION
Initial Offset Adjustment Procedure
RTI MAS-2 User's Manual 2019.12A
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In the display unit,select the appropriate Meter display, e.g. tap Measure,
Radiography, Tube Current, and choose the EMMmodule to be able to read the
current. It is typically shown in the unit "mA".
Tap Reset, then "0" should be displayed.
The offset adjustment procedure for RTI Meter is finished and the RTI MAS-2 is ready
for measurements.
3 MEASUREMENTS
Measurements of the mAs and mA value3.1
Just perform an exposure and the displaywill show you readings of tube current (mA)
and tube charge (mAs). You may also study the tube current waveform. The RTI Meter
starts to measure when the mA signal is greater than approximately 10 mA when
using the RTI MAS-2. For long exposure times, the display updates continuously
during the exposure. (See Settings in the RTI Meter manual).
4 SAFETY PRECAUTIONS
General Rules4.1
•Do NOT use the RTI MAS-2 on a circuit with a voltage of higher than 600 V AC.
•Do NOT remove the battery compartment cover when attempting to measure
current.
•Do NOT connect the RTI Meter to an oscilloscope/DVMand simultaneously use the
same oscilloscope/DVM connected to the banana terminals of the clamp probe.
•Do NOT make batteryreplacement with the RTI MAS-2 powered ON.
•Do NOT expose the instrument to direct sunlight, extremes of temperature and
humidity, or dew fall.
•Do NOT forget to turn the RTI MAS-2 off after use.
RTI Group AB takes no responsibilityfor misuse of the RTI MAS-2 or use together with
products that the RTI MAS-2 is not intended for.
RTI Group AB assumes no responsibilityfor customers not following these safety
precautions.

4. SAFETY PRECAUTIONS
General Rules
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5 SPECIFICATIONS
For PROVA 15 specifications see the "PROVA 15 User's Manual"
General Specifications for RTI MAS-25.1
Specifications are valid after a warm-up time of one minute and presuming reference
conditions. All specifications together with the clamp probe probe unless otherwise
stated.
Reference conditions:
Temperature:
+20 °C
Relative humidity:
50 %
Specifications:
Current range RTI MAS-2 output:
10 - 4000 mA
Inaccuracy:
±3 % at 250 mA
±5 % or ±2 mAbetween 10 - 4000 mA
Scale factor (RTI MAS-2 output):
1 nA/mA(±0,1 %)
Maximum diameter
of high voltage cable:
Appr. 23 mm
Cable length:
150 cm
Weight:
< 0,2 kg
Operating temperature
and relative humidity:
15 - 30 °C
at <80 % relative humidity
Storage temperature:
-10 °C to +50 °C
Batterylife for PROVA15:
Appr. one year of use or 40 hours
Batterytype for PROVA 15:
2 alkaline IEC R6 (size AA) 1,5 Vbatteries

RTI MAS-2 User's Manual 2019.12A
Index
8
Index
Note!
Page references in this Index points to the
first page of the section it is mentioned, not
the exact page.
- A -
Accuracy 7
- B -
Battery 7
Battery Lif e 7
- C -
Connection of the RTI MAS-2 5
- F -
Function of the RTI MAS-2 5
- I -
Inaccuracy 7
Initial Off set Adjustment Procedure 5
- M -
Measurements 6
Measuring Range 7
- O -
Offset Adjustment Procedure 5
Opertaing sy stems 4
- R -
Range 7
- S -
Safety 6
Specif ications 7
- W -
Windows 2000 4
Windows 95 4
Windows 98 4
Windows Me 4
Windows NT 4
Windows XP 4
Work f low 6

Notes
RTI MAS-2 User's Manual2019.12A
Notes
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