Model 870 mA/mAs Meter

With exposure time measurement

FEATURES
• Small hand held size
• Measure current from any x-ray
• Single phase
• Full wave
• Multiphase
• DC
• New High Accuracy Circuit
• Self-Resetting
• Battery Operated
• Two Year Warranty
• Built in measurement of battery
• Use for Medical or Dental X-rays
• Use for digital x-ray
• Displays mA, mAs and exposure time for each reading
• Easy to use

DESCRIPTION
• Measures tube current of x-ray generators.
• Calculates product of exposure time and mA for mAs.
• Connect two leads in series with tube current.
• Exposure time is measured in milliseconds.
• New improved circuit increases accuracy, reliability
• Provides automatic detection of AC / DC
• Eliminates need to reset.
• Stores and displays mA minimizing need for long x-ray exposure.
• Displays all information eliminating need for multiple exposures.

TYPICAL APPLICATIONS
• Check x-ray tube filament emission by measuring mAs value of exposure
• Check and adjust mA settings
• Verification of x-ray exposure time
• Calibration of x-ray timer
• Quality Assurance
• Measurement of exposure time
• Analyze x-ray malfunctions

SPECIFICATIONS FOR MODEL 870 mA / mAs METER

RANGE
•200 mA Full Scale
•0.1 mA Resolution (mA or mAs)
•10 Ohms Input impedance
•Measures 5 to 200 mA
•2A Full Scale
•1 mA Resolution (mA or mAs)
•1 Ohm Input impedance
•Meter automatically selects AC/DC
•select range via On / Off Switch

mA / mAs ACCURACY
•1% +/- 2 mA on all ranges

CONNECTION
•Tip Jacks
•Test leads with two alligator clips

RECALIBRATION
•Annually

OPERATING CONDITIONS
•+10o to 40o C
•50o to 104o F


KVp / mAs Meter And Exposure Time Meter
Model 820 / Low Range 820L


FEATURES
Combines two instruments
KVp and mAs in one package
Easy to use
No need to set for AC/DC
mAs meter is self-resetting
mA is stored permitting short exposures
kVp is noninvasive
AC or DC x-rays
High accuracy
Measures kVp, mA, mAS, exposure time
Battery operated
Two year warranty
Custom carrying case option
Solid state digital design
Durable ABS plastic case

DESCRIPTION
Use as mAs Meter or kVp Meter
mA and mAs measure x-ray tube
current
KVp measures the peak x-ray
accelerating voltage from tungsten xray
generators.
Direct Measurement of peak kV from
the x-ray head, simply place 820(L) in
beam and take x-ray.
Push Mode button to display Exposure
Time.
Indicates x-ray waveform type - e.g.
Half-wave, Full-wave or DC / 3 Phase.
Optimized for Dental x-rays, also works
on radiographic and fluoroscopic xrays.
Large display readable from outside
x-ray room.
Alphanumeric display provides easy to
understand status and error messages.
Plug in mAs cable to measure mA and
mAs.
Remove mAs cable to measure kVp

TYPICAL APPLICATIONS
Verification of peak x-ray voltage
Constancy checks
Calibration of x-ray
Quality assurance
Measurement of exposure time
Half value layer determination
Troubleshooting and repair of x-rays
Maintain quality of x-ray

SPECIFICATIONS FOR 820/820L kVp
RANGE
820: 45 to 125Kv
820L: 40 to 115Kv
KVP ACCURACY
2% +/- 1 kV, at 25 to 100 mA (820)
 or 10 to 50 mA (820L) both
18 to 42 cm from head, for Tungsten
target x-ray tube with 1.5 mm Aluminum
equivalent filtration.
EXPOSURE TIME ACCURACY
1% +/- 2 millisecond (1/5 to 2 sec)
Minimum exposure time is 100
millisecond
MINIMUM EXPOSURE TIME
100 millisec -High Speed Mode
200 millisec -High Resolution Mode
MINIMUM CURRENT (mA)
7 mA (820) or 5 mA (820L) at 50 kV,
10 cm from x-ray, depending on focus

SPECIFICATIONS FOR 820/820L mAs
RANGE
200 mA Full Scale
0.1 mA Resolution (mA or mAs)
10 Ohms Input impedance
2A Full Scale
1 mA Resolution (mA or mAs)
1 Ohm Input impedance
Meter automatically selects AC/DC
Set Range via pushbutton switch
mAs ACCURACY
2% +/- 1 mA on both ranges
CONNECTION
Via 1 meter cable with two alligator
clips

ORDERING INFORMATION
Model 820 X-ray kVp /mAs / Exposure Time
Meter
Model 820L Low Range X-ray kVp / mAs /
Exposure Time Meter
Please note that the Model 815 X-ray
kVp/Exposure Time Meter is still available.

GENERAL SPECIFICATIONS
DISPLAY
0.4" (10.2mm) Liquid Crystal
8 Character Alphanumeric
CONTROLS/INDICATORS
ON/OFF Switch – Illuminated
push-button with green
power-on indication
MODE Switch - momentary
push-button
8 Character Liquid Crystal Display
No connections needed for kVp
measurement
POWER
4 AA batteries accessible from
bottom of case
Low battery indicator
BATTERY LIFE
48 hours continuous
Typically 9 months of normal use
WARRANTY
2 years from ship date
PHYSICAL SIZE
150 X 120 X 58.5 mm
5.9 X 4.7 X 2.3 inches
WEIGHT
0.7 kg, (1.5 lb)



Contact We:

Huaruison Science and Technology Development Co., Ltd.
Address：No.16 guanghuaRoad,Tongzhou Development Zone Beijing 10100,P.R.China
Phone:0086-10-51266093，QQ:1275041125
Fax:0086-10-51266093
E-mail：huaruison@yahoo.com.hk
http://www.huaruison.com
http://www.eccxray.com/zhongkao.html
http://www.xraytest.cn