VXI Technology, Inc.
(FRONT PANEL CONNECTOR)
100K |
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10K | K9 |
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10pf |
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+CH1
VMIP
BUS
IRQ*
100K
100K
CONTROL
- | 6K |
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U17A |
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+ |
| 2K |
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100K |
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| K9 |
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10K |
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| VCC |
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| BUFCH1 - | 4.7K |
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DACDATA | D A C | TRIGLEV1 | 1K |
| U13A |
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DACLOAD# | + |
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DACCLK |
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| 470K |
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| U8 |
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| COMPCH1 |
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| VCC |
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RELAYCLK |
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| 10K |
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RELAYDATA |
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| LATIRQOUT | TO FRONT PANEL |
U3
RELAYENA* | CONNECTOR |
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| 4.7K |
| Q34 |
| 1K |
DATA | DATA |
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| BUFFER | DATA | |
DOE* |
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| U4 |
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ADDRESS |
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CONTROL |
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BUFFER |
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CONTROL |
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| U1 |
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RELAY DRIVER
U15
TO RELAY K9
FIGURE 3-1: SINGLE CHANNEL OPERATION
Due to the type of signal being monitored, input channel +CH1 is grounded. The command and data for the SCPI command INP:RANG is received by the control (U1) and data (U4) buffers and routed to the control FPGA (U3). The control FPGA converts the parallel data for the relay drivers into a serial data stream. This data (RELAYDATA) is synched to the 10 MHz (RELAYCLK) and written into the relay drivers when (RELAYENA*) goes low. The relay drivers will energize relay K9 selecting a gain of 0.1 for the differential amplifier U17A.
36 | VM4016 Programming |
