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VX4101A MultiPaq Instrument User Manual
1–3
Measurement gating comes from one of several sources, including VXI TTL
triggers, counter front panel arm, software triggers, periodic trigger, and another
VX4101A instrument, such as SurePathtrelay switched and settled. Other key
features of the Universal Counter are as follows:
H Frequency measurements with ten-digit resolution at 1 second aperture, with
a range of 1 mHz - 250 MHz
H The option 1C extends the maximum frequency beyond 500 MHz
H 250 ns resolution (1 ps with averaging)
H Input signal conditioning: x1, x10, x100 attenuation with 0.4 to 10.0 variable
gain and up to ±100 V offset depending on attenuation, DC or AC coupling,
and 50 W or 1 MW input (with automatic over-current protection for the
50 W mode)
For more information on Counter input operations, see Appendix D: Counter
Architecture.
H Optional 3 GHz channel 3 prescaler input with option 2C
H Optional temperature controlled, oscillated or crystal Clock Source (TCXO)
with Option 1T
NOTE. You can also use the VXI backplane 10 MHz clock (CLK10) as the
Counter clock source.
Both the Digital Input and Digital Output instruments provide low-speed data
exchange with 32 bits of data. The Digital Input and Output share a single 32-bit
interface on the 160-pin connector. The frequency range for both input and
output is from 3.662 Hz to 48 kHz. The Digital Input and Output instruments
include the following features:
H External handshaking
H 4K × 32 bits memory
H Pattern matching available on the Digital Input
H Programmable input threshold and selectable output voltage
H Outputs can be repeated continuously or counted a specified number of times
The module self-tests perform full read, write, and verify tests on both shared
memory and read/write control registers. The SCPI TEST subsystem provides
programming capabilities for the self-test functions.
About the Digital Input
and Output Modules