HYDRA

Service Manual

Table 2-8. Display Initialization Modes

A2TP4

1

1

0

0

A2TP5

1

0

1

0

Power-Up Display Initialization

All Segments OFF

All Segments ON (default)

Display Test Pattern #1

Display Test Pattern #2

The Display Controller provides 11 grid control outputs and 15 anode control outputs (only 14 anode control outputs are used). Each of these 26 high-voltage outputs provides an active driver to the +5V dc supply and a passive 220-kΩ(nominal) pull-down to the - 30V dc supply. These pull-down resistances are internal to the Display Controller.

The Display Controller provides multiplexed drive to the vacuum-fluorescent display by strobing each grid while the segment data for that display area is present on the anode outputs. Each grid is strobed for approximately 1.14 milliseconds every 13.8 milliseconds, resulting in each grid on the display being strobed about 72 times per second. The grid strobing sequence is from GRID(10) to GRID(0), which results in left- to-right strobing of grid areas on the display. Figure 2-9 shows grid control signal timing.

The single grid strobing process involves turning off the previously enabled grid, outputting the anode data for the next grid, and then enabling the next grid. This procedure ensures that there is some time between grid strobes so that no shadowing occurs on the display. A grid is enabled only if one or more anodes are also enabled. Thus, if all anodes under a grid are to be off, the grid is not turned on. Figure 2-10 describes the timing relationship between an individual grid control signal and the anode control signals.

 

GRID TIMING

 

13.8 ms

0V

 

GRID(10)

1.14 ms

 

0V

 

GRID(9)

1.14 ms

 

…

 

…

 

0V

 

GRID(1)

1.14 ms

 

0V

 

GRID(0)

1.14 ms

 

 

116 ∝s

 

s9f.eps

Figure 2-9. Grid Control Signal Timing

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Fluke 2635A, 2625A service manual Display Initialization Modes, Power-Up Display Initialization
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2635A, 2625A specifications

The Fluke 2625A is a sophisticated data logger designed for a wide range of industrial and laboratory applications. This versatile instrument excels in capturing and monitoring temperature and voltage measurements with precision and reliability. One of its standout features is its ability to record data from various sensors, making it ideal for environments where comprehensive data acquisition is critical.

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