950L8B Datasheet, PDF (4/9 Pages) Frequency Devices, Inc. – Tunable Filter Instruments

Model 950
A
C&D
B
E
Location of Front Panel
Terminals and Controls
Location of Front Panel Terminals and Controls
ON
950
50 100
CORNER
TUNEABLE ACTIVE FILTER ²⁰
200 _FREQUENCY
10
500 _{IN Hz}
INPUT
A
B
GAIN OFFSET
(dB)
G
OUT
A-B
A
10 _-
0
+
R _x100
A
N
I
GND
G
20
E ^x1
H
F
Location of Rear Panel Terminals and Controls
K
J
APR.01
SN: 00105
950L8L
L
SELECT
115v
230v
M
FUSE
(250V 0.1A)
(250V 0.1A)
NOM. FREQ.
60 Hz
50 Hz
WARNING: Do not remove covers, no user serviceable parts inside.
Contact: Frequency Devices for service, [e-mail]
MADE IN U.S.A
FRONT PANEL
REAR PANEL
A. POWER Status Lamp: This red LED
indicates whether or not the power to the
analog filter circuitry of a Model 950
instrument is on.
B. INPUT Switch: This three position
toggle configures the instrument for
either differential inputs (A-B), a single-
ended input (A), or input nulling (GND)
which grounds both the (A) and (B) input
terminals.
C. & D. (A) and (B) Input Terminals:
This pair of shielded, female BNC
connectors accept signal inputs (A) and
(B). The instrument applies a non-
inverting gain to input (A) and an equal
but opposite inverting gain to input (B)
while the GAIN switch sets the magnitude
of differential gain to 0, 10, or 20 dB. The
BNC shields have been internally
connected to the instrument ground.
E. GAIN Switch: This three-position
toggle switch selects an overall filter gain
of 0, 10, or 20dB.
F. OFFSET Adjust: This adjustment is
intended to zero the offset that results
from the instrument’s own circuitry and
does not provide for wide range offset to
remove dc input signals.
G. CORNER FREQUENCY Selector
Switch (10-500Hz): This six position
rotary switch selects the digit value of the
corner frequency. The switch selectable
values are 10, 20, 50, 100, 200 and 500,
H. MULTIPLIER Selector Switch: This
two-position toggle switch multiplies by a
factor of either 1 or 100x, the value set
on the CORNER FREQUENCY selector
switch.
I. OUT Terminal: This terminal is a
female BNC connector. The shield on
the BNC is internally connected to the
instrument ground.
4
J. IDENTIFICATION LABEL: This label
identifies the date of manufacture, serial
number, filter type and operating power
requirements.
K. POWER CONNECTION: Denotes
power plug location.
L. POWER ON/OFF Switch: A two-
position toggle switch on the back panel
Power Module that interrupts/completes
the power circuit.
M. Voltage Selector Module:
115V Operation
The power module window shows the
operating voltage (115V or 230V). At
time of shipment, the voltage window will
be set to the 115V position.
230V Operation
For 230V operation, use a small flathead
screwdriver to pry open the fuse module
door. Remove the fuse cartridge, fuse
clip and single fuse for 115V operation.
Install two 5 X 20 mm 250V, 0.1A fuses
into the fuse cartridge, rotate and insert
fuse cartridge so 230V is visible in fuse
module door when closed.
1784 Chessie Lane, Ottawa, IL 61350 • Tel: [phone] • FAX: [phone]
e-mail: [e-mail] • Web Address: http://www.freqdev.com