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參數(shù)資料
| 型號(hào)： | 19635 |
| 廠商： | Desco |
| 文件頁數(shù)： | 3/4頁 |
| 文件大?。?/td> | 0K |
| 描述： | TESTER MINIMEG 9VDC NIST |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | Micro Meg™ |
| 類型： | 表面電阻測(cè)量?jī)x |
| 使用： | 測(cè)量表面電阻系數(shù)、接地電阻 |
| 特點(diǎn)： | NIST 溯源 |
| 電源類型： | 9V 電池 |
| 包括： | 電池，軟線 |
TB-2083 Page 3 of 4
Figure 6. Cleaning the electrodes.
2. Clean both the snap stud and the electrodes with
a cotton swab soaked in isopropyl alcohol. Check the
rubber centers for wear - the rubber should form a
convex spot on the bottom of the electrode. The three
electrodes will be checked with each annual, factory
calibration. If electrode replacement is recommended,
the customer will be notified with estimated charges
before any changes are made.
Theory of Operation
The Micro Meg measures resistance by setting up a
bridge between two precision 1% resistors of known
value and the surface tested, of unknown value. When
the white button is depressed a test voltage of 9 VDC
is applied to the megohmmeter’s center electrode or
ground cord, depending on the test being performed.
One of the bottom electrodes on the outside of the
meter supplies the resistance bridge. The test voltage
resulting from the bridge is compared to reference
voltages established by six trimming potentiometers.
Two integrated circuits are configured as comparators
to check the voltage from the bridge against the
potentiometers. Based on the setting of each
potentiometer, the appropriate LED is lit.
Specifications
Sensitivity Range
Surface Resistivity
Less than 10E10 ohms/sq
Surface-to-Ground
Less than 10E9 ohms
LED Key (from right to left)
1. Red
>10E10, Meter On, and Battery OK
2. Green
10E10
Static Dissipative
3. Green
10E9
Static Dissipative
4. Green
10E8
Static Dissipative
5. Green
10E7
Static Dissipative
6. Yellow
10E6
Static Dissipative
7. Yellow
10E5
Conductive
Test Sample Size
3" x 1-1/2" or larger
General Characteristics
Power Supply
9 volt alkaline battery (included)
Test Voltage
Nominal 9 volts
Electrodes
Steel and conductive rubber
Temperature Range
Operating
40°F to 120°F (10°C to 40°C)
Storage
42°F to 110°F (-15°C to +60°C)
Relative Humidity
0% to 99% (non condensing)
Operation
Resistance bridge
Readout
Seven LEDs
Resolution
One order of magnitude
Accuracy
±10% all, except ±20% 10E9,
10E10
Weight
6 ounces
Dimensions
4" x 2.5" x 1.75"
Calibration
The Micro Meg is calibrated to NIST traceable
standards. It may be returned to the factory for
calibration. Contact our Customer Service Department
at 909-627-8178 (Chino, CA) or 781-821-8370
(Canton, MA) for a Return Material Authorization.
Written Purchase Orders are required for calibration
services.
A check on the function of the Micro Meg can be
performed with the following procedure. You will need
1% resistors of the following values: 5 x 10E5 ohms;
5 x 10E6 ohms; 5 x 10E7 ohms; 5 x 10E8 ohms, 5 x
10E9 ohms, and 1 x 10E10 ohms. These precision
resistors will be placed across the two electrodes on
the bottom of the meter (see Figure 7).
For calibrating, when using the resistance value the
LED value is:
LED Value
Resistance Value (ohms)
10E10 Green
< 5 x 10E10
10E9 Green
< 1 x 10E10
10E8 Green
< 1 x 10E9
10E7 Green
< 1 x 10E8
10E6 Yellow
< 1 x 10E7
10E5 Yellow
< 1 x 10E6
A. Place the Micro Meg on an insulator (e.g. Teflon or
glass) and press the white test button. Only the first red
LED on the right, marked “On” should be illuminated.
If this LED fails to light, the battery should be replaced
before proceeding.
SNAP SOCKET
CONDUCTIVE RUBBER
SNAP STUD
DESCO WEST
- 3651 Walnut Avenue, Chino, CA 91710 (909) 627-8178 Fax (909) 627-7449
DESCO EAST
- One Colgate Way, Canton, MA 02021-1407 (781) 821-8370 Fax (781) 575-0172 Web Site: Desco.com
2010 DESCO INDUSTRIES INC.
Employee Owned
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