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）