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Digital input/ouput
Use the digital outputs with an external power supply to control microwave switches
and attenuators, solenoids, power relays, indicators, and more. Use the digital inputs to
sense limit switch and digital bus status. There are no complex handshake modes; reads
and writes are initiated either from the front panel or the bus.
Port 1, 2
8 bit, input or output, nonisolated
Vin(L)
< 0.8 V (TTL)
Vin(H)
> 2.0 V (TTL)
Vout(L)
< 0.8 V @ Iout = –400 mA
Vout(H)
> 2.4 V @ Iout = 1 mA
Vin(H) max
< 42 V with external open drain pull-up
Alarming
Maskable pattern match or state change
Speed
4 ms (max) alarm sampling
Latency
5 ms (typical) to DAQ970A alarm output
Read/write speed 95/s
Totalize input
Count events from devices like photo interrupters, limit switches, and Hall-effect
sensors.
It keeps an updated total which can be read via the front panel or programmatically
at any time. With 26 bits of resolution, it can count events at full speed for nearly 11
minutes without an overflow.
Max count
2
26
- 1
Totalize input
100 kHz (max) Rising or falling edge,
programmable
Signal level
1 Vp-p (min) 42 Vpk (max)
Threshold
0 V or TTL, jumper selectable
Gate Input
TTL-Hi, TTL-Lo, or none
Count reset
Manual or Read + Reset
Read speed
85/s
Analog output
Use the two electronically calibrated analog outputs to source bias voltages to your
device under test, to control your analog programmable power supplies, or use the
outputs as setpoints for your control systems. The outputs are programmed directly in
volts, either from the front panel or from the bus.
On top of that, it has two additional channels (Channel 6 and 7) that provide the ability
to sense output current when sourcing voltage, or sense output voltage when sourcing
current.
DAC 1, 2
± 12 V or ± 24 mA analog outputs
Resolution
100 uV, 0.2 uA
IOUT
15 mA max per channel
Settling time
1 ms to 0.01% of output
Accuracy
±(% of mV)
1 year ± 5 °C
Voltage: ± 0.027% 4.4 mV
Current: ± 0.115% of 4.4 uA
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