MODEL 225 DIGITAL FREQUENCY TO VOLTAGE CONVERTER
Features
- Fast response
- High accuracy
- Input isolation to 1000 V
- Digital and analog outputs
Description
The Model 225 consists of up to seven channels in a 19" wide x 7"
high x 17.5" deep rack adaptor. A power supply module also plugs into
the rack, and provides the required unregulated DC voltages to operate
the system. Operation of the unit is over a wide band of frequencies
from 0.5Hz to 25,600Hz. The output is in both 16-bit digital and analog
voltage format. Two switch selectable precision calibration points are
available in each module.
Specifications
Input: 0.025V peak to 100V peak
Input isolation: Transformer isolated to 1000VRMS, or direct
coupled
Common mode rejection: 2.5VRMS DC to 1kHz will not trigger
the unit
Input comparator: Front panel adjustable trigger threshold
from 0.02V to 10V; front panel tipjacks for voltmeter monitoring
Frequency ranges: Front panel switch selects one of eight
fullscale ranges: 200Hz, 400Hz, 800Hz, 1600Hz, 3200Hz, 6400Hz, 12800Hz,
or 25600Hz
Low-input cutoff: Input signal below 0.25% will cause outputs
to go to zero and a no-input indication to light
Pulse output: Logic level (0-5V) output at the input frequency
| Digital outputs: |
Frequency |
16-bit binary number, 0 to 65535 |
|
Data valid |
One bit |
|
No input |
One bit |
|
Selected range |
Three bits |
|
Data enable
strobe input |
One bit |
Analog output: Jumper selectable 0-5VDC or 0-10VDC fullscale
output, with front panel trimpots to adjust span and zero; front panel
tipjacks for voltmeter monitoring
Calibration: Internal crystal oscillator provides 10% and
100% fullscale calibration frequencies on remote command or by front
panel switch
Output accuracy: ±0.05% of fullscale reading
Transient response: 4/f (4 periods of input signal) max (2
to 3 typical) up to 3200 Hz range; Higher ranges are 8 periods, 16
periods, and 32 periods
Output noise: 2mV RMS max, DC to 100kHz
Mechanical: 19"W x 7"H x 17.5"D, 8 module rack adapter, Model
4007-136
Carrying case: 1 and 2 module desktop cases, Model
4009-106 and 4010-110
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