KNOVA KN 8056, Manual

Diagnosis of automotive Troubles

figure 20

Ground

Low frequency MAF Sensor of

GM (General Motor in 1988 or before

Black

Red

Testing Procedure:
(1) Connect the DC voltage type MAF sensor in

     the DC voltage testing method and set the

     rotary switch of the meter to 20VDC. Connect 

     the frequency type MAF sensor in the RPMx10

      testing method and set the meter to the number

     of cylinders in the automobile.

     Now take 4 cylinders (4CYL) for example.
(2) Connect the black test lead probe of the meter

     to the ground terminal (i.e. ground strap

     connection) and connect the red one as

     illustrated in figure 21.
(3) Turn on the ignition key but do not start

     the engine.
Displayed Values:
DC Voltage Type Sensor:
The displayed value should be less than or equal to

1V. (The details shall be based on the parameters

furnished by the supplier.)
Frequency Type Sensor:
In a vacuum state, the displayed value should be

330 RPM 5%. (This only applies to GM low

frequency sensors.) The other low frequency

sensors shall be based on the parameters

furnished by the supplier.)

          • The reading becomes the actual RPM

only after it is multiplied by 10.

•       Fuse Protection of

   mA terminal

: CE Version: 315mA, 250V,

  fast type, ø5 x 20mm

Remark: Input impedance: 10M

Ω

• Frequency = RPM/30. (This only applies to

   4CYL.).

General Specifications

• Maximum

 Voltage between any Terminals

   and grounding: Refer to different range input

   protection voltage.

Accurate Specifications

Accuracy: (a% R Digits), guarantee

                for 90 days.
Operating Temperature: 18oC to 28oC.
Relative Humidity: No more than 75% RH.

A. DC Voltage

• Measurement Speed  : Updates 2-3

                                          times /second.

• 

Maximum Display 

: 1999.

• 

Temperature 

: Operating: 0ºC~40ºC

  (32ºF~104ºF)

  Storage: -10ºC~50ºC

  (14oF~122oF)

• 

Relative Humidity 

:     75% @ 0ºC

  to below 30ºC;

      50% @ 30ºC to 40ºC.

• 

Altitude: Operating 

: 2000m; Storage:

  10000m.

• 

Battery Type 

: One piece of 9V

  (NEDA1604

  or 6F22 or 006P).

•

 Electromagnetic

   Compatibility 

: In a radio field of 1 V/m,

  Overall Accuracy

  = Specified

  Ac 5%

  of Range; in a radio field

  of more than 1 V/m, no

  assigned accuracy

  is specified

• 

Battery Deficiency 

: Display     .

• 

Negative reading 

: Display     .

• 

Overloading 

: Display 1.

• 

Equipped with full

   icons display.

• 

Manual ranging.

• 

Polarity  

: Automatically display.

• 

Dimensions (HxWxL)  : 179 x 88 x 39 mm.

• Weight

: 380 g. (including holster

  and battery)

• 

Safety/Compliances  : IEC61010: CAT. II

  1000V, CAT. III 600V

  overvoltage and double

  insulation standard.

• 

Certification 

:

WARNING

•       Fuse Protection of

   10A terminal

: CE Version: 10A, 250V,

  fast type, ø5 x 20mm

Range

200mV

2 V

20V

200V

1000V

Resolution

0.1mV

1mV

10mV

100mV

1V

Accuracy

±(0.5%+5)

±(0.8%+5)

Overload protection

230VAC

1000 VDC or 750

VAC continuous

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