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Precision
Battery-powered Generator
provides differential low level, low frequency waveforms for repair, testing
and calibration
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The Model FG220
Function Generator is designed especially for the biomedical and
low level instrumentation field, offering features not found on
any other generator in its price range. It provides constant amplitude
sine, square, and triangle waveforms, with a frequency range of
0.01 Hz to 10 kHz. It features a calibrated and continuously variable
output from 0 to 10 volts peak-to-peak, utilizing a vernier control
and six switch-selected full scale ranges of 100 µV, 1 mV, 10 mV,
100 mV, 1.0 volts and 10 volts. Accuracy is ±2% of full scale on
each range and has a constant output impedance of 100 ohms. The
output mode switch allows selection of differential (balance) or
common (single-ended) outputs.
The differential
and common mode outputs provide a convenient way to measure the
common mode rejection ratio of differential amplifiers. The CMRR
is simply calculated by dividing the function generator's common
mode amplitude setting by the differential mode amplitude setting
which produces the same deflection as displayed on a monitor screen
or the same voltage output as an amplifier being tested.
Housed in a
lightweight, high-impact ABS plastic case, and being battery-powered,
the Model FG220 Function Generator is ideal for bench or field use.
Being battery-operated, it can eliminate possible ground loops and
reduce AC interference, which can be so troublesome when working
with low level signals. A blinking, power-on LED, located on the
front panel, serves as a reminder to turn off the generator when
not in use, thereby extending battery life. This same LED also functions
as a low battery indicator. Output connectors are three 3-way binding
posts on the front panel and three snap patient leadwire connectors
on the back panel.
The Model FG220
Function Generator will provide the user with a fast and convenient
way to test, calibrate and service a wide range of differential
and common-mode input instruments such as monitors, oscilloscopes,
recorders, amplifiers, etc. In addition, the low frequency and low
amplitude waveforms can be used to calibrate and verify calibration
of EEG/Polygraph instrumentation and power spectral analytic software/hardware.
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| ORDERING
INFORMATION |
| Model
FG220 |
|
Function
Generator, includes manual, 9 VDC alkaline batteries |
| Optional
Accessories: |
| Model
CAB-21422 |
|
Output
cable, 3-lead cable, 6-foot (1.8 m) length |
|
| Features
and Benefits |
•
0.01 Hz to 10 kHz frequency range
• Sine, triangle, square waveforms
• Differential, common-mode outputs
• Calibrated output attenuators
• Output variable from 10 µV to 10.0 volts
• Lightweight and battery-powered |
| SPECIFICATIONS
|
| Frequency
Range |
| Frequency
Range |
|
0.01-0.1,
0.1-1.0, 1.0-10, 10-100, 100-1 kHz, 1-10 kHz, ±3% of full scale |
| Waveforms
|
| Waveforms |
|
Sine,
triangle, square |
| Sinewave
Distortion |
|
Less
than 2% |
| Triangle
Linearity |
|
Greater
than 98% |
Squarewave
Rise
and Fall Times |
|
Less
than 2 µ seconds |
| Output
|
| Output
Modes |
|
Differential
(balance) and common (single-ended) |
| |
Differential:
Calibrated
voltage appears between + and - terminals |
| |
Common:
Calibrated voltage appears between common and ± terminals |
| |
(Plus
and minus terminals are connected together.) |
| Output
Amplitude |
|
Continuously
variable from zero to 10.0 volts, peak-to-peak, by six switch-selected
full-scale ranges of 100 µV, 1 mV, 10 mV, 100 mV, 1.0 volt and
10.0 volt and calibrated vernier control |
Output
Amplitude
Symmetry |
|
All
waveforms are symmetrical about ground, ± 2% |
| Output
Impedance |
|
100
ohms |
| Output
Accuracy |
|
Output
is calibrated within ± 2% of full scale when operating into
an impedance of 10 kohms or greater. When load impedance is
less than 10 kohms:
E out = E1 Z1
/ Z1+Z2
Z1 = Load Impedance
Z2 = Generator output impedance (100 ohms)
E1 = Generator dial setting
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| Power |
| Power
Supply |
|
Two
9-volt batteries |
| Battery
Life |
|
Approximately
100 hours |
| Physical
Size |
| Physical
Size |
|
8.08"
W x 2.5" H x 6.25" D
(20.5 cm x 6.4 cm x 15.9 cm) |
| Weight |
|
28 oz. (784 g) |
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