Atec Agilent-34972A - Manual (Page 25)

25
34907A
Multifunction Module
• 16 bits of digital input and output
• 100 kHz totalizer input
• Two ± 12 V analog outputs
The Agilent 34907A allows great flexibility for a variety
of sense and control applications. It combines two 8-bit
ports of digital input and output, a 100 kHz gated totalizer,
and two ± 12 V analog outputs—all on a single earth-
referenced module. The digital inputs and totalizer input
may be included in a scan. Alarm limits for the digital and
event counter inputs are evaluated continuously, capturing
and logging alarm conditions even between scans.
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 34970A 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.
DAC 1, 2 ± 12 V, nonisolated
Resolution 1 mV
IOUT 10 mA max
Settling time 1 ms to 0.01% of output
Accuracy ± (% of output + mV)
1 year ± 5 °C 0.25% + 20 mV
Temp. coefficient ± ( 0.015% + 1 mV)/°C
Port 1
Channel 01
Port 2
Channel 02
Channel 03
Channel 04
Channel 05
Bit 0
Bit 7
8
Bit 0
Bit 7
16
8
26 Bits
+IN
-IN
Gate
Gate
DIO
TOT
DAC 1
16
DAC 2