技术资料.pdf - 第29页
29 Trigger output Level TTL compatib le into 1 kΩ (3.3 V logic) Output impe dance 50 Ω typical Clock input Input level TTL compatib le into 1 kΩ (3.3 V logic) Input impedance 50 Ω typical Maximu m rate 10 MHz Clock outpu…
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34951A 4-Channel Isolated D/A Converter with
Waveform Memory
This module has four independent, isolated channels that output DC voltage up to ± 16 V or DC current
up to ± 20 mA. The gain and offset can be adjusted on-the-fly.
Each channel can be controlled manually or use the onboard memory to download a waveform. The 500k
of memory is global and can store up to 32 waveforms. Any waveform can be dynamically allocated
among one or more channels and output as a point-to-point arbitrary waveform generator at up to 200k
points/sec. You can use the standard since square or ramp wave shapes provided or define your own
wave shape using over 500k points and output to a device under test. There is also a single CLK that can
be divided down for each channel independently. The calibration command connects the D/A converters
to the internal DMM to be automatically calibrated. Connections to the module can be made via standard
50-pin Dsub, cables, or a detachable terminal block.
34951A 4 channel D/A
General specifications
Maximum update rate
200 kHz point-to-point
Monotonic
To 16 bits
Isolation
> 80 VDC/AC peak (chan-to-chassis or chan-to-chan)
Synchronization
Software commands or external trigger
Internal/external CLK accuracy
100 ppm
AC accuracy
Not specified
DC voltage
Amplitude
± 16 V up to 10 mA
Resolution
16 bits = 500µV
Amplitude accuracy
± (0.05% + 3.0 mV) (90 days, Tcal ± 5 °C or Cal:MOD?: ± 5 °C)
Ripple and noise
< 2 mVrms, 20 Hz to 250 kHz into 10 kΩ load
Settling time
40 µS (-full scale to +full scale step, single-channel, to rated accuracy)
Output impedance
< 1 Ω with the load sensed
DC current
Range
± 20 mA
Resolution
16-bit = 630 nA
Accuracy
± (0.09% + 5.0 μA) (90 days, Tcal ± 5 °C or Cal:MOD?: ± 5 °C)
Ripple and noise
< 2 μArms, 20 Hz to 250 kHz into 250 Ω
Compliance voltage
± 12 V
Maximum open circuit voltage
< ± 22 V
Trigger input
Input level
TTL compatible (3.3 V logic, 5 V tolerant)
Slope
Rising or falling, selectable
Pulse width
> 100 ns
Input impedance
> 10 kΩ, DC coupled
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Trigger output
Level
TTL compatible into 1 kΩ (3.3 V logic)
Output impedance
50 Ω typical
Clock input
Input level
TTL compatible into 1 kΩ (3.3 V logic)
Input impedance
50 Ω typical
Maximum rate
10 MHz
Clock output
Level
TTL compatible into 1 kΩ (3.3 V logic)
Output impedance
50 Ω typical
Maximum rate
10 MHz
Accuracy
± 100 ppm
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34952A Multifunction Module with 32-bit DIO,
2-Channel D/A and Totalizer
The multifunction module offers the flexibility you need for system control. The 34952A has four 8-bit
digital I/O channels, 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 list. Alarm limits for
the digital and totalizer inputs are evaluated continuously, capturing and logging alarm conditions even
between scans. Connections can be made via standard 50-pin Dsub cables or detachable terminal
blocks. The 34952T terminal block has a pinout for connection to an external Opto 22 board.
34952A multifunction module
Digital input/output characteristics
Channels
Four 8-bit channels, 8 bits wide, input or output, non–isolated
Vin(L)
< 0.8 V (TTL)
Vin(H)
> 2.0 V (TTL)
Vout(L)
< 0.8 V @ Iout = -400 mA per output
Vout(H)
> 2.4 V @ Iout = 1 mA
Vin(H) max
< 42 VDC with external open drain pull-up
Alarm
Maskable pattern match or state change
Speed
4 ms (max) alarm sampling
Latency
5 ms (typical) to 34980A alarm output
Read/write speed
95/s
Totalize input characteristics
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
Gate input
TTL-Hi, TTL-Lo, or none
Count reset
Manual or read + reset
Read speed
85 rds/s
Analog output characteristics
DAC 1,2
± 12 V, non-isolated
Resolution
1 mV
IOUT
10 mA max
Settling time
1 ms to 0.01% of output
Accuracy
1 year
± (% of output + mV)
(0.25% + 20 mV)
Temp. coefficient
± (0.015% + 1 mV)/
o
C