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.
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 28 bits of resolution, it can
count events at full speed for nearly
45 minutes without an overflow.
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.
HP 34907A
Multifunction Module
• 16 bits of digital input and output
• 100 kHz totalizer input
• Two ±12V analog outputs
The HP 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 ±12V 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/Output
Port 1, 2 8 bit, input or output,
non-isolated
Vin(L) < 0.8V (TTL)
Vin(H) > 2.0V (TTL)
Vout(L) < 0.8V @ Iout = - 400 mA
Vout(H) > 2.4V @ Iout = 1 mA
Vout(H) max < 42V 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
Max Count 228- 1
Totalize Input 100 kHz (max)
Rising or falling edge,
programmable
Signal level 1 Vp-p (min)
42 Vpk (max)
Threshold 0V or TTL,
jumper selectable
Gate Input TTL-Hi, TTL-Lo, or none
Count Reset Manual or Read + Reset
Read Speed 85/s
Analog Output
D
AC 1, 2 ± 12V, non-isolated
Resolution 1 mV
I
OUT
10 mA max
Settling time 1 ms to 0.01% of output
Accuracy ±(% of output + mV)
1 year ±5°C 0.15% + 6 mV
90 day ±5°C 0.1% + 6 mV
24 hour ±1°C 0.04% + 4 mV
Temp. Coefficient ± ( 0.015%
+ 1 mV) / °C
Port 1
Channel 01
Port 2
Channel 02
Bit 0
Bit 7
8
Bit 0
Bit 7
16
8
Channel 03
Channel 04
28 Bits
+IN
-IN
Gate
Gate
DIO
TOT
DAC 1
16
Channel 05
DAC 2
HP 34970A Data Acquisition/Switch Unit
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