84 Final Assembly Parts
See Table 8-1 and Figure 8-1 for the Final Assembly parts. Top case assembly Fluke 192B, 196B, 196C, 199B, 199C without Keypad set includes large amp small keypad Display unit B W Fluke 192B, 196B, 199B The Display unit does not include the flat cable Flat cable for display unit both versions Unit is provided with sticker 190B C see note 1 below On delivery the Fluke 199C testsoftware is loaded Load appropriate software and type number, then See Section 10.4 for more information. Bottom case...
List of Figures
2-1 .Max. Input Voltage vs. 2-2. Safe Handling Max. Input Voltage Between Scope References, Between Scope References and Meter Reference, and between Scope References Meter Reference and earth 2-3. Max Voltage from Probe Tip to Ground and from Probe Tip to Probe Reference 2-17 3-1. Fluke190B-C Block 3-2. Fluke 190B-C Start-up Sequence, Operating 3-3. C-ASIC OQ0260 Block 3-4. LF Floating to 3-5. C-ASIC Control 3-6. Meter Ext Channel Block 3-7. S-ASIC signal section block 3-8. S-ASIC Input 3-9....
34 Detailed Circuit Descriptions
Capacitors of 0 pF, and resistors of 100 MQ shown in circuit diagrams are not placed on the PCA. They are drawn in the circuit diagrams for PCA layout purposes. In the layout design process they create locations on the PCA where capacitors or resistors can be placed. 3.4.1 Scope Channel A - Scope Channel B See circuit diagrams Figure 9-1 and Figure 9-2. As the Scope Channel A and B circuits are identical, a description is given for Scope Channel A only. The Channel A B circuitry is built-up...
Volts function
1. Select METER , MEASURE CM , V ac dc. 3. Apply a positive dc voltage of 50 full scale to the input. 4. Check D1501 3 for a -60 mV voltage level, interrupted by reference level pulses - 220 mV, each 2.5 seconds from D1501 13 zero, each 400 ms from D1501 12. 5. Check N1501 7 for a -120 mV voltage level gain N1501 is x2 , interrupted by reference level pulses - 220 mV and -240 mV, each 2.5 seconds zero, each 400 ms 6. Check N1525 5 the voltage levels must be 0.33x the levels measured in step 5....
756 Channel A Channel B Measurements
See circuit diagram Figure 9-1 and 9-2. When measuring in the input circuits of a the disassembled test tool, the backlight control voltage can cause noise on the measured signals. Do NOT power the unit when the backlight cable is disconnected 1. Select SCOPE, and turn both channels on. 2. Apply a 200 kHz sine wave with a peak-to-peak value of 8 divisions to the inputs. For example at 1 V div apply 8 Vpp. Select manual ranging. 3. Check the S-ASIC output voltage for channel A on D3000 pin 5,...
32Block Diagram
For the overall block diagram of the test tool see Figure 3-1. Fluke190B-C Block Diagram. The dashed frames indicate the division into the detailed circuit diagrams Figures 9-1 to 9-10. Table 3-1 shows the main functions of the circuits in diagrams Figure 9-1 to 9-10. Table 3-1. Fluke190B-C Main Functional Blocks Table 3-1. Fluke190B-C Main Functional Blocks Multimeter Input signal conditioning External trigger input, probe calibration output signal Sampling of conditioned input signals Trigger...
Backlight Converter
The LCD back light is provided by a 02.4 mm fluorescent lamp in LCD unit. The back light converter generates the 300-400 Vpp supply voltage. The circuit consist of A pulse width modulated PWM buck regulator to generate a variable, regulated voltage V4200, V4202, L4200, C4210 . A zero voltage switched ZVS resonant push-pull converter to transform the variable, regulated voltage into a high voltage AC output V4201, T4200 . The PWM buck regulator consists of FET V4200, V4202, L4200, C4202, and a...
Press SD YES
When turning the test tool off and on again, it will show the message The instrument needs calibration. Please contact your service center. The calibration date and number will not be updated. You must continue with the Final Calibration To return to the Maintenance mode, if you want to repeat the complete calibration Now press tf until the display shows WarmingUp CL 0200 IDLE, and calibrate the test tool, starting at section 5.5. If you want to exit and maintain the old calibration data
List of Tables
2-1. Scope No Visible Disturbance at E 3 2-2. Scope Disturbance lt 10 at E 3 2-18 2-3. Meter Disturbance lt 1 at 3 3-1. Fluke190B-C Main Functional 3-2. Fluke190B-C Operating 3-3. D-ASIC PWM 4-1. Vertical Accuracy Verification 4-2. Volts DC Measurement Verification 4-4. Input A amp B AC Input Coupling Verification 4-5. Volts Peak Measurement Verification 4-6. Input A amp B Frequency Measurement Accuracy 4-7. Phase Measurement Verification 4-8. Input A Trigger Sensitivity Test 4-18 4-9. HF AC...
625 Removing the Main PCA Unit and the Fan
To avoid contaminating the flex cable contacts with oil from your fingers, do not touch the contacts or wear gloves . Contaminated contacts may not cause immediate instrument failure in controlled environments. Failures typically show up when contaminated units are operated in humid areas. Referring to Figure 6-5, use the following procedure to remove the main PCA unit. 1. Open the test tool see Section 6.2.4 . 2. Disconnect the blue keypad foil item 5 flat cable, and the white LCD item 7 flex...
Manual Supplement
Manual Title Fluke 192B 196B-C 199B-C Service Manual Supplement Issue 3 Part Number 4822 872 05391 Part Number 4822 872 08633 Print Date September 2002 Issue Date 07-April-05 Revision Date 0 Page Count 2 This supplement contains information necessary to ensure the accuracy of the above manual. 2005 Fluke Corporation. All rights reserved. Printed in the Netherlands Fluke 192B 196B-C 199B-C Service Manual The following changes must be made to the service manual Chapter 4, section 4.8.3 Continuity...