268XA
Service Manual
2-36
Table 2-11. Function Relays
Function
K26
K25
K27
F0
F1
F2
F3
F4
F5
V dc, TC, OTC
S
R
R
0
1
1
0
1
0
Ohms
S
R
S
0
1
1
0
0
1
V ac, Frequency
R
S
R
1
0
0
1
1
0
Table 2-12. Function Relay Settling Time
PAI
FAI
6 ms
6 ms
Stallion Chip and Signal Conditioning
The Stallion Chip (A3U30) is a Fluke-custom IC that contains assorted switches,
amplifiers, and the frequency counter. The chip contains registers that the A3U5 A/D
microprocessor may read and write to configure the chip and obtain frequency readings.
Its interface to the A3U5 A/D microprocessor consists of a synchronous serial port. The
SCP port of the A3U5 A/D microprocessor is used to program the Stallion, with a clock
rate of 3.072 MHz. When reading information from the Stallion (the only time this needs
to be done is for frequency readings), the clock rate is reduced to 960 kHz. Due to a
limitation of the Stallion chip, the fastest that data may be reliably read from the chip is
1 MHz.
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