MODEL SR445
FAST PREAMPLIFIER
MODEL SR445
FAST PREAMPLIFIER
1290-D Reamwood Avenue
Sunnyvale, California 94089
Phone: (408) 744-9040 • Fax: (408) 744-9049
email: info@thinkSRS.com • www.thinkSRS.com
Copyright © 1990 by SRS, Inc.
All Rights Reserved.
Revision 1.2 (10/2001)
INTRODUCTION
The Model SR445 Fast Preamp contains four
wide bandwidth, DC coupled amplifiers
designed to be used independently or cascaded
to provide gains of 5, 25, and 125.
STANFORD RESEARCH SYSTEMS DC-300 MHz AMPLIFIER
SRS
500
Ω
50
Ω
MODEL SR445
50 A = 5/CHANNEL
Ω
The fast rise time, low noise, and DC accuracy
of the SR445 make it the ideal instrument for
amplifying outputs of fast photomultiplier
tubes and photodiodes.
INININ OUT OUTOUT
v
Figure 1 - SR445 Front Panel
TYPICAL SPECIFICATIONS
INPUTS 50 Ω impedance, DC coupled, BNC connectors
(channel 1 selectable 50 or 500 Ω).
IN OUT
OUTPUTS DC coupled, BNC connectors (terminate into 50 Ω).
VOLTAGE GAIN 5.0 per channel (up to 3 channels can be cascaded).
BANDWIDTH DC to 300 MHz (-3 dB).
RISE/FALL TIME 1.2 ns.
PROPAGATION DELAY 2.2 ns.
RECOVERY TIME <4 ns for a times 20 overload.
OPERATING RANGE inputs ±200 mV, outputs ±1.0 V.
OVERSHOOT ±5%.
NOISE <50 µV rms referenced to the input, (2.2 nV/√Hz).
STABILITY 10 µV/°C referenced to the inputs (0 to 50°C).
OFFSET input ±50 µV (adjustable).
PROTECTION ±3.5 V DC, ±50 V transient.
MECHANICAL 7.7" x 6.7" x 2".
POWER 16W, 100/120/ 220/240 VAC, 50/60 Hz.
WARRANTY One year parts and labor on materials and workmanship.
OPERATION
The SR445 Fast Preamplifier is useful for
amplifying small signals to levels that allow
processing by other instruments such as the
SR430 Multichannel Scaler, or the SR400
Gated Photon Counter. The four channels may
be used independently or cascaded. The
following table shows the maximum input
voltage for linear operation as a function of
amplitude gain.
Number of
Channels Gain Maximum Input
1 5 200 mV
2 25 40 mV
3 125 8 mV
The input impedance of channel 1 can be
increased to approximately 500 Ω by using the
front panel switch. This can improve the
sensitivity to signals from current and charge
output devices such as photo-multiplier tubes.
However, under these conditions cable
capacitance must be kept as low as possible to
preserve the frequency response and rise time
of channel 1. The other three channels are
unaffected.
TROUBLESHOOTING
WARNING: Dangerous voltages are present
on the printed circuit board. Always turn the
power off and disconnect the line cord before
removing the cover or changing components.
There are two rows of 4 holes in the cover,
which access the offset calibration pots. The
first row is the input offset adjust, and the
second row the output offset adjust.
Allow at least 30 minutes for the unit to warm
up before calibrating. To calibrate the input
offset, connect a voltmeter to the input and
adjust the pot at the front hole in line with that
channel to 0.0 V ±10 µV. To calibrate the
output offset, connect a voltmeter to the
output and adjust the pot at the back hole in
line with that channel to 0.0 V ±50 µV.
CIRCUIT DESCRIPTION
Input signal coupling is provided by D1, D2,
D3, and D4 which are biased by R14, R8,
R9, and R27. Positive overload protection is
supplied by the action of Q6 and D10. When
the output reaches +1.25 Volts, Q6 begins to
conduct, stealing bias current from D1 and
D3. Thus, the input voltage is effectively
clamped at ±0.25 Volts. Similarly, Q5 and D8
provide negative overload protection. Input
offsets are nulled out with P1. SW1 allows the
channel 1 input impedance to be increased to
500 Ω by the use of bootstrapping. Q1 and Q2
comprise a fully symmetrical push-pull output
stage that is driven by the complimentary pair
of Q3 and Q4. U1 uses feedback to maintain
DC accuracy and P2 adjusts the output offset
voltage of the amplifier.
OVERLOAD BEHAVIOR
The diodes in the overload protection circuit
can be damaged by excessive voltages at the
input of any stage. To check for damage,
measure for 0.6 Volts across diodes D1
through D4. Recalibration is necessary if any
of the diodes are changed.
CALIBRATION
allowance of the application. A graph of
recovery time versus overload duration is
The SR445 accurately amplifies input signals
from -200 mV to +200 mV. Transient
overloads to ±50 Volts can be safely
accommodated, and DC inputs up to ±3.5
Volts that will not damage the unit. The time
required for the amplifier output to return
from an overload condition is a function of the
duration of the overload and the error
shown in Figure 2. The input referred error
bands are defined as the voltage difference
between the input signal and the output
voltage divided by the amplifier gain (5
Volts/Volt). For example, after a 100 ns
overload, 1 µs is required to reach 2 mV
accuracy (input referred). However, if 20 mV
accuracy is sufficient, then the amplifier will
recover from the same overload in 20 ns.
LINE VOLTAGE SELECTION
The SR445 operates from a 100, 120, 220 or
240 Volt AC nominal, 50 or 60 Hz power
source. Before applying power, verify that the
line selector card (located in the power entry
module) is in the correct position. The selected
voltage is indicated by the white dot on the
voltage list.
SR445 Pulse Overload Response
Recovery Time vs. Overload Duration
5
10
To change the line voltage selection,
disconnect the line cord and remove the fuse
module with a small screwdriver. Pull out the
voltage selection card (located at the right of
the power entry module) with a pair of needle
nose pliers. Rotate the plastic indicator until it
lines up with the correct voltage indicated on
the fuse holder and reinsert the card. Install the
correct fuse, reinsert the fuse holder and
replace the line cord.
LINE FUSE
Verify that the correct line fuse is installed
before connecting the line cord. The rear
panel indicates the correct fuse size, 1/4 Amp
@ 100/120 Volts or 1/8 Amp @ 220/240
Volts. If necessary, the fuse can be changed as
indicated in the line voltage selection section.
4
10
Error Band (input referred)
3
10
2
10
Recovery Time in nanoSeconds
1
10
0
10
0
10
1
10
Overload Duration in
2
10
3
10
4
10
5
10
6
10
2 mV
4 mV
10 mV
20 mV
Figure 2
Parts List SR445
REF. SRS PART# VALUE DESCRIPTION
C 1A 5-00100-517 2.2U Capacitor, Tantalum, 35V, 20%, Rad
C 1B 5-00100-517 2.2U Capacitor, Tantalum, 35V, 20%, Rad
C 1C 5-00100-517 2.2U Capacitor, Tantalum, 35V, 20%, Rad
C 1D 5-00100-517 2.2U Capacitor, Tantalum, 35V, 20%, Rad
C 2A 5-00018-501 5P Capacitor, Ceramic Disc, 50V, 10%, SL
C 2B 5-00018-501 5P Capacitor, Ceramic Disc, 50V, 10%, SL
C 2C 5-00018-501 5P Capacitor, Ceramic Disc, 50V, 10%, SL
C 2D 5-00018-501 5P Capacitor, Ceramic Disc, 50V, 10%, SL
C 3A 5-00023-529 .1U Cap, Monolythic Ceramic, 50V, 20%, Z5U
C 3B 5-00023-529 .1U Cap, Monolythic Ceramic, 50V, 20%, Z5U
C 3C 5-00023-529 .1U Cap, Monolythic Ceramic, 50V, 20%, Z5U
C 3D 5-00023-529 .1U Cap, Monolythic Ceramic, 50V, 20%, Z5U
C 4A 5-00023-529 .1U Cap, Monolythic Ceramic, 50V, 20%, Z5U
C 4B 5-00023-529 .1U Cap, Monolythic Ceramic, 50V, 20%, Z5U
C 4C 5-00023-529 .1U Cap, Monolythic Ceramic, 50V, 20%, Z5U
C 4D 5-00023-529 .1U Cap, Monolythic Ceramic, 50V, 20%, Z5U
C 5A 5-00100-517 2.2U Capacitor, Tantalum, 35V, 20%, Rad
C 5B 5-00100-517 2.2U Capacitor, Tantalum, 35V, 20%, Rad
C 5C 5-00100-517 2.2U Capacitor, Tantalum, 35V, 20%, Rad
C 5D 5-00100-517 2.2U Capacitor, Tantalum, 35V, 20%, Rad
C 6A 5-00106-530 9.0-50P Capacitor, Variable, 200V, 5m
C 6B 5-00106-530 9.0-50P Capacitor, Variable, 200V, 5m
C 6C 5-00106-530 9.0-50P Capacitor, Variable, 200V, 5m
C 6D 5-00106-530 9.0-50P Capacitor, Variable, 200V, 5m
C 8A 5-00215-501 20P Capacitor, Ceramic Disc, 50V, 10%, SL
C 8B 5-00215-501 20P Capacitor, Ceramic Disc, 50V, 10%, SL
C 8C 5-00215-501 20P Capacitor, Ceramic Disc, 50V, 10%, SL
C 8D 5-00215-501 20P Capacitor, Ceramic Disc, 50V, 10%, SL
C 9A 5-00013-501 33P Capacitor, Ceramic Disc, 50V, 10%, SL
C 9B 5-00013-501 33P Capacitor, Ceramic Disc, 50V, 10%, SL
C 9C 5-00013-501 33P Capacitor, Ceramic Disc, 50V, 10%, SL
C 9D 5-00013-501 33P Capacitor, Ceramic Disc, 50V, 10%, SL
C 10A 5-00013-501 33P Capacitor, Ceramic Disc, 50V, 10%, SL
C 10B 5-00013-501 33P Capacitor, Ceramic Disc, 50V, 10%, SL
C 10C 5-00013-501 33P Capacitor, Ceramic Disc, 50V, 10%, SL
C 10D 5-00013-501 33P Capacitor, Ceramic Disc, 50V, 10%, SL
C 11A 5-00132-501 56P Capacitor, Ceramic Disc, 50V, 10%, SL
C 11B 5-00132-501 56P Capacitor, Ceramic Disc, 50V, 10%, SL
C 11C 5-00132-501 56P Capacitor, Ceramic Disc, 50V, 10%, SL
C 11D 5-00132-501 56P Capacitor, Ceramic Disc, 50V, 10%, SL
C 12A 5-00180-501 43P Capacitor, Ceramic Disc, 50V, 10%, SL
C 12B 5-00017-501 47P Capacitor, Ceramic Disc, 50V, 10%, SL
C 12C 5-00017-501 47P Capacitor, Ceramic Disc, 50V, 10%, SL
Parts List SR445
REF. SRS PART# VALUE DESCRIPTION
C 12D 5-00017-501 47P Capacitor, Ceramic Disc, 50V, 10%, SL
C 13A 5-00033-520 47U Capacitor, Electrolytic, 16V, 20%, Rad
C 13B 5-00033-520 47U Capacitor, Electrolytic, 16V, 20%, Rad
C 13C 5-00033-520 47U Capacitor, Electrolytic, 16V, 20%, Rad
C 13D 5-00033-520 47U Capacitor, Electrolytic, 16V, 20%, Rad
C 14A 5-00023-529 .1U Cap, Monolythic Ceramic, 50V, 20%, Z5U
C 14B 5-00023-529 .1U Cap, Monolythic Ceramic, 50V, 20%, Z5U
C 14C 5-00023-529 .1U Cap, Monolythic Ceramic, 50V, 20%, Z5U
C 14D 5-00023-529 .1U Cap, Monolythic Ceramic, 50V, 20%, Z5U
C 15A 5-00033-520 47U Capacitor, Electrolytic, 16V, 20%, Rad
C 15B 5-00033-520 47U Capacitor, Electrolytic, 16V, 20%, Rad
C 15C 5-00033-520 47U Capacitor, Electrolytic, 16V, 20%, Rad
C 15D 5-00033-520 47U Capacitor, Electrolytic, 16V, 20%, Rad
C 16A 5-00017-501 47P Capacitor, Ceramic Disc, 50V, 10%, SL
C 16B 5-00017-501 47P Capacitor, Ceramic Disc, 50V, 10%, SL
C 16C 5-00017-501 47P Capacitor, Ceramic Disc, 50V, 10%, SL
C 16D 5-00017-501 47P Capacitor, Ceramic Disc, 50V, 10%, SL
C 18A 5-00200-532 470P Capacitor, Ceramic Disc, 50V, 10% NPO
C 18B 5-00200-532 470P Capacitor, Ceramic Disc, 50V, 10% NPO
C 18C 5-00200-532 470P Capacitor, Ceramic Disc, 50V, 10% NPO
C 18D 5-00200-532 470P Capacitor, Ceramic Disc, 50V, 10% NPO
C 19A 5-00023-529 .1U Cap, Monolythic Ceramic, 50V, 20%, Z5U
C 19B 5-00023-529 .1U Cap, Monolythic Ceramic, 50V, 20%, Z5U
C 19C 5-00023-529 .1U Cap, Monolythic Ceramic, 50V, 20%, Z5U
C 19D 5-00023-529 .1U Cap, Monolythic Ceramic, 50V, 20%, Z5U
C 20A 5-00200-532 470P Capacitor, Ceramic Disc, 50V, 10% NPO
C 20B 5-00200-532 470P Capacitor, Ceramic Disc, 50V, 10% NPO
C 20C 5-00200-532 470P Capacitor, Ceramic Disc, 50V, 10% NPO
C 20D 5-00200-532 470P Capacitor, Ceramic Disc, 50V, 10% NPO
C 23 5-00100-517 2.2U Capacitor, Tantalum, 35V, 20%, Rad
C 24 5-00100-517 2.2U Capacitor, Tantalum, 35V, 20%, Rad
C 25 5-00022-501 .001U Capacitor, Ceramic Disc, 50V, 10%, SL
C 26 5-00023-529 .1U Cap, Monolythic Ceramic, 50V, 20%, Z5U
C 27 5-00147-521 3300U Capacitor, Electrolytic, 25V, 20%, Rad
C 28 5-00147-521 3300U Capacitor, Electrolytic, 25V, 20%, Rad
C 29 5-00100-517 2.2U Capacitor, Tantalum, 35V, 20%, Rad
C 30 5-00100-517 2.2U Capacitor, Tantalum, 35V, 20%, Rad
C 31 5-00008-501 22P Capacitor, Ceramic Disc, 50V, 10%, SL
C 32 5-00023-529 .1U Cap, Monolythic Ceramic, 50V, 20%, Z5U
D 1A 3-00004-301 1N4148 Diode
D 1B 3-00004-301 1N4148 Diode
D 1C 3-00004-301 1N4148 Diode
D 1D 3-00004-301 1N4148 Diode
Parts List SR445
REF. SRS PART# VALUE DESCRIPTION
D 2A 3-00004-301 1N4148 Diode
D 2B 3-00004-301 1N4148 Diode
D 2C 3-00004-301 1N4148 Diode
D 2D 3-00004-301 1N4148 Diode
D 3A 3-00004-301 1N4148 Diode
D 3B 3-00004-301 1N4148 Diode
D 3C 3-00004-301 1N4148 Diode
D 3D 3-00004-301 1N4148 Diode
D 4A 3-00004-301 1N4148 Diode
D 4B 3-00004-301 1N4148 Diode
D 4C 3-00004-301 1N4148 Diode
D 4D 3-00004-301 1N4148 Diode
D 5A 3-00004-301 1N4148 Diode
D 5B 3-00004-301 1N4148 Diode
D 5C 3-00004-301 1N4148 Diode
D 5D 3-00004-301 1N4148 Diode
D 6A 3-00004-301 1N4148 Diode
D 6B 3-00004-301 1N4148 Diode
D 6C 3-00004-301 1N4148 Diode
D 6D 3-00004-301 1N4148 Diode
D 7A 3-00004-301 1N4148 Diode
D 7B 3-00004-301 1N4148 Diode
D 7C 3-00004-301 1N4148 Diode
D 7D 3-00004-301 1N4148 Diode
D 8A 3-00004-301 1N4148 Diode
D 8B 3-00004-301 1N4148 Diode
D 8C 3-00004-301 1N4148 Diode
D 8D 3-00004-301 1N4148 Diode
D 9A 3-00004-301 1N4148 Diode
D 9B 3-00004-301 1N4148 Diode
D 9C 3-00004-301 1N4148 Diode
D 9D 3-00004-301 1N4148 Diode
D 10A 3-00004-301 1N4148 Diode
D 10B 3-00004-301 1N4148 Diode
D 10C 3-00004-301 1N4148 Diode
D 10D 3-00004-301 1N4148 Diode
D 11 3-00232-304 GREEN LED, T1-3/4 Package
D 12 3-00062-340 KBP201G/BR-81D Integrated Circuit (Thru-hole Pkg)
J 1A 1-00003-120 BNC Connector, BNC
J 1B 1-00003-120 BNC Connector, BNC
J 1C 1-00003-120 BNC Connector, BNC
J 1D 1-00003-120 BNC Connector, BNC
J 2A 1-00003-120 BNC Connector, BNC
Parts List SR445
REF. SRS PART# VALUE DESCRIPTION
J 2B 1-00003-120 BNC Connector, BNC
J 2C 1-00003-120 BNC Connector, BNC
J 2D 1-00003-120 BNC Connector, BNC
J 3 1-00065-114 7 PIN; WHITE Header, Amp, MTA-100
L 1A 6-00017-630 FB43-301 Ferrite Beads
L 1B 6-00017-630 FB43-301 Ferrite Beads
L 1C 6-00017-630 FB43-301 Ferrite Beads
L 1D 6-00017-630 FB43-301 Ferrite Beads
L 2A 6-00017-630 FB43-301 Ferrite Beads
L 2B 6-00017-630 FB43-301 Ferrite Beads
L 2C 6-00017-630 FB43-301 Ferrite Beads
L 2D 6-00017-630 FB43-301 Ferrite Beads
L 3A 6-00017-630 FB43-301 Ferrite Beads
L 3B 6-00017-630 FB43-301 Ferrite Beads
L 3C 6-00017-630 FB43-301 Ferrite Beads
L 3D 6-00017-630 FB43-301 Ferrite Beads
L 4A 6-00017-630 FB43-301 Ferrite Beads
L 4B 6-00017-630 FB43-301 Ferrite Beads
L 4C 6-00017-630 FB43-301 Ferrite Beads
L 4D 6-00017-630 FB43-301 Ferrite Beads
L 5A 6-00017-630 FB43-301 Ferrite Beads
L 5B 6-00017-630 FB43-301 Ferrite Beads
L 5C 6-00017-630 FB43-301 Ferrite Beads
L 5D 6-00017-630 FB43-301 Ferrite Beads
L 6A 6-00017-630 FB43-301 Ferrite Beads
L 6B 6-00017-630 FB43-301 Ferrite Beads
L 6C 6-00017-630 FB43-301 Ferrite Beads
L 6D 6-00017-630 FB43-301 Ferrite Beads
P 1A 4-00011-441 10K Pot, Multi-Turn Trim, 3/8" Square Top Ad
P 1B 4-00011-441 10K Pot, Multi-Turn Trim, 3/8" Square Top Ad
P 2A 4-00011-441 10K Pot, Multi-Turn Trim, 3/8" Square Top Ad
P 2B 4-00011-441 10K Pot, Multi-Turn Trim, 3/8" Square Top Ad
P 3A 4-00011-441 10K Pot, Multi-Turn Trim, 3/8" Square Top Ad
P 3B 4-00011-441 10K Pot, Multi-Turn Trim, 3/8" Square Top Ad
P 4A 4-00011-441 10K Pot, Multi-Turn Trim, 3/8" Square Top Ad
P 4B 4-00011-441 10K Pot, Multi-Turn Trim, 3/8" Square Top Ad
PC1 7-00311-701 SR240/445 Printed Circuit Board
Q 1A 3-00019-324 MRF914 Transistor, TO-72 Package
Q 1B 3-00019-324 MRF914 Transistor, TO-72 Package
Q 1C 3-00019-324 MRF914 Transistor, TO-72 Package
Q 1D 3-00019-324 MRF914 Transistor, TO-72 Package
Q 2A 3-00017-324 MM4049 Transistor, TO-72 Package
Q 2B 3-00017-324 MM4049 Transistor, TO-72 Package
Parts List SR445
REF. SRS PART# VALUE DESCRIPTION
Q 2C 3-00017-324 MM4049 Transistor, TO-72 Package
Q 2D 3-00017-324 MM4049 Transistor, TO-72 Package
Q 3A 3-00017-324 MM4049 Transistor, TO-72 Package
Q 3B 3-00017-324 MM4049 Transistor, TO-72 Package
Q 3C 3-00017-324 MM4049 Transistor, TO-72 Package
Q 3D 3-00017-324 MM4049 Transistor, TO-72 Package
Q 4A 3-00019-324 MRF914 Transistor, TO-72 Package
Q 4B 3-00019-324 MRF914 Transistor, TO-72 Package
Q 4C 3-00019-324 MRF914 Transistor, TO-72 Package
Q 4D 3-00019-324 MRF914 Transistor, TO-72 Package
Q 5A 3-00028-325 2N5771 Transistor, TO-92 Package
Q 5B 3-00028-325 2N5771 Transistor, TO-92 Package
Q 5C 3-00028-325 2N5771 Transistor, TO-92 Package
Q 5D 3-00028-325 2N5771 Transistor, TO-92 Package
Q 6A 3-00027-325 2N5770 Transistor, TO-92 Package
Q 6B 3-00027-325 2N5770 Transistor, TO-92 Package
Q 6C 3-00027-325 2N5770 Transistor, TO-92 Package
Q 6D 3-00027-325 2N5770 Transistor, TO-92 Package
R 1A 0-00001-000 WIRE Hardware, Misc.
R 1B 4-00242-407 73.2 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 1C 4-00242-407 73.2 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 1D 4-00242-407 73.2 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 2A 4-00356-407 20 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 2B 4-00356-407 20 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 2C 4-00356-407 20 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 2D 4-00356-407 20 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 3A 4-00188-407 4.99K Resistor, Metal Film, 1/8W, 1%, 50PPM
R 3B 4-00188-407 4.99K Resistor, Metal Film, 1/8W, 1%, 50PPM
R 3C 4-00188-407 4.99K Resistor, Metal Film, 1/8W, 1%, 50PPM
R 3D 4-00188-407 4.99K Resistor, Metal Film, 1/8W, 1%, 50PPM
R 4A 4-00356-407 20 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 4B 4-00356-407 20 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 4C 4-00356-407 20 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 4D 4-00356-407 20 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 5A 4-00302-407 82.5 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 5B 4-00302-407 82.5 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 5C 4-00302-407 82.5 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 5D 4-00302-407 82.5 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 6A 4-00374-407 51.1 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 6B 4-00374-407 51.1 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 6C 4-00374-407 51.1 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 6D 4-00374-407 51.1 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 7A 4-00302-407 82.5 Resistor, Metal Film, 1/8W, 1%, 50PPM
Parts List SR445
REF. SRS PART# VALUE DESCRIPTION
R 7B 4-00302-407 82.5 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 7C 4-00302-407 82.5 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 7D 4-00302-407 82.5 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 8A 4-00215-407 909 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 8B 4-00215-407 909 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 8C 4-00215-407 909 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 8D 4-00215-407 909 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 9A 4-00215-407 909 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 9B 4-00215-407 909 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 9C 4-00215-407 909 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 9D 4-00215-407 909 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 10A 4-00191-407 49.9 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 10B 4-00191-407 49.9 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 10C 4-00191-407 49.9 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 10D 4-00191-407 49.9 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 11A 4-00659-407 21.5 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 11B 4-00659-407 21.5 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 11C 4-00659-407 21.5 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 11D 4-00659-407 21.5 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 12A 4-00191-407 49.9 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 12B 4-00191-407 49.9 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 12C 4-00191-407 49.9 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 12D 4-00191-407 49.9 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 13A 4-00659-407 21.5 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 13B 4-00659-407 21.5 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 13C 4-00659-407 21.5 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 13D 4-00659-407 21.5 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 14A 4-00141-407 100 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 14B 4-00141-407 100 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 14C 4-00141-407 100 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 14D 4-00141-407 100 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 15A 4-00193-407 499 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 15B 4-00193-407 499 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 15C 4-00193-407 499 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 15D 4-00193-407 499 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 16A 4-00193-407 499 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 16B 4-00193-407 499 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 16C 4-00193-407 499 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 16D 4-00193-407 499 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 17A 4-00660-401 75 Resistor, Carbon Film, 1/4W, 5%
R 17B 4-00660-401 75 Resistor, Carbon Film, 1/4W, 5%
R 17C 4-00660-401 75 Resistor, Carbon Film, 1/4W, 5%
R 17D 4-00660-401 75 Resistor, Carbon Film, 1/4W, 5%
Parts List SR445
REF. SRS PART# VALUE DESCRIPTION
R 18A 4-00029-401 1.8K Resistor, Carbon Film, 1/4W, 5%
R 18B 4-00029-401 1.8K Resistor, Carbon Film, 1/4W, 5%
R 18C 4-00029-401 1.8K Resistor, Carbon Film, 1/4W, 5%
R 18D 4-00029-401 1.8K Resistor, Carbon Film, 1/4W, 5%
R 19A 4-00029-401 1.8K Resistor, Carbon Film, 1/4W, 5%
R 19B 4-00029-401 1.8K Resistor, Carbon Film, 1/4W, 5%
R 19C 4-00029-401 1.8K Resistor, Carbon Film, 1/4W, 5%
R 19D 4-00029-401 1.8K Resistor, Carbon Film, 1/4W, 5%
R 20A 4-00660-401 75 Resistor, Carbon Film, 1/4W, 5%
R 20B 4-00660-401 75 Resistor, Carbon Film, 1/4W, 5%
R 20C 4-00660-401 75 Resistor, Carbon Film, 1/4W, 5%
R 20D 4-00660-401 75 Resistor, Carbon Film, 1/4W, 5%
R 21A 4-00192-407 49.9K Resistor, Metal Film, 1/8W, 1%, 50PPM
R 21B 4-00192-407 49.9K Resistor, Metal Film, 1/8W, 1%, 50PPM
R 21C 4-00192-407 49.9K Resistor, Metal Film, 1/8W, 1%, 50PPM
R 21D 4-00192-407 49.9K Resistor, Metal Film, 1/8W, 1%, 50PPM
R 22A 4-00193-407 499 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 22B 4-00193-407 499 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 22C 4-00193-407 499 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 22D 4-00193-407 499 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 23A 4-00193-407 499 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 23B 4-00193-407 499 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 23C 4-00193-407 499 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 23D 4-00193-407 499 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 24A 4-00034-401 10K Resistor, Carbon Film, 1/4W, 5%
R 24B 4-00034-401 10K Resistor, Carbon Film, 1/4W, 5%
R 24C 4-00034-401 10K Resistor, Carbon Film, 1/4W, 5%
R 24D 4-00034-401 10K Resistor, Carbon Film, 1/4W, 5%
R 26A 4-00348-407 2.21K Resistor, Metal Film, 1/8W, 1%, 50PPM
R 26B 4-00348-407 2.21K Resistor, Metal Film, 1/8W, 1%, 50PPM
R 26C 4-00348-407 2.21K Resistor, Metal Film, 1/8W, 1%, 50PPM
R 26D 4-00348-407 2.21K Resistor, Metal Film, 1/8W, 1%, 50PPM
R 27A 4-00141-407 100 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 27B 4-00141-407 100 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 27C 4-00141-407 100 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 27D 4-00141-407 100 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 28A 4-00034-401 10K Resistor, Carbon Film, 1/4W, 5%
R 28B 4-00034-401 10K Resistor, Carbon Film, 1/4W, 5%
R 28C 4-00034-401 10K Resistor, Carbon Film, 1/4W, 5%
R 28D 4-00034-401 10K Resistor, Carbon Film, 1/4W, 5%
R 29 4-00308-407 1.02K Resistor, Metal Film, 1/8W, 1%, 50PPM
R 30 4-00038-401 120 Resistor, Carbon Film, 1/4W, 5%
R 31 4-00138-407 10.0K Resistor, Metal Film, 1/8W, 1%, 50PPM
Parts List SR445
REF. SRS PART# VALUE DESCRIPTION
R 32 4-00138-407 10.0K Resistor, Metal Film, 1/8W, 1%, 50PPM
R 33 4-00031-401 100 Resistor, Carbon Film, 1/4W, 5%
R 34 4-00021-401 1.0K Resistor, Carbon Film, 1/4W, 5%
R 35 4-00138-407 10.0K Resistor, Metal Film, 1/8W, 1%, 50PPM
R 36 4-00138-407 10.0K Resistor, Metal Film, 1/8W, 1%, 50PPM
R 37A 4-00417-407 2.74K Resistor, Metal Film, 1/8W, 1%, 50PPM
R 37B 4-00417-407 2.74K Resistor, Metal Film, 1/8W, 1%, 50PPM
R 37C 4-00417-407 2.74K Resistor, Metal Film, 1/8W, 1%, 50PPM
R 37D 4-00417-407 2.74K Resistor, Metal Film, 1/8W, 1%, 50PPM
R 38A 4-00193-407 499 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 38B 4-00193-407 499 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 38C 4-00193-407 499 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 38D 4-00193-407 499 Resistor, Metal Film, 1/8W, 1%, 50PPM
R 39 4-00031-401 100 Resistor, Carbon Film, 1/4W, 5%
RX1A 4-00242-407 73.2 Resistor, Metal Film, 1/8W, 1%, 50PPM
SW1 2-00025-217 SPDT Switch, On-None-On, Toggle, Right Angle
T 1 6-00077-610 SR445/FS710 Transformer
U 1A 3-00106-340 LT1007 Integrated Circuit (Thru-hole Pkg)
U 1B 3-00106-340 LT1007 Integrated Circuit (Thru-hole Pkg)
U 1C 3-00106-340 LT1007 Integrated Circuit (Thru-hole Pkg)
U 1D 3-00106-340 LT1007 Integrated Circuit (Thru-hole Pkg)
U 2 3-00119-329 7905 Voltage Reg., TO-220 (TAB) Package
U 3 3-00106-340 LT1007 Integrated Circuit (Thru-hole Pkg)
U 4 3-00291-340 LM336Z-2.5V Integrated Circuit (Thru-hole Pkg)
U 5 3-00116-325 78L05 Transistor, TO-92 Package
U 6 3-00106-340 LT1007 Integrated Circuit (Thru-hole Pkg)
U 7 3-00112-329 7805 Voltage Reg., TO-220 (TAB) Package
Z 0 0-00025-005 3/8" Lugs
Z 0 0-00043-011 4-40 KEP Nut, Kep
Z 0 0-00108-054 1" #26 Wire #26 UL1061
Z 0 0-00187-021 4-40X1/4PP Screw, Panhead Phillips
Z 0 0-00208-020 4-40X3/8PF Screw, Flathead Phillips
Z 0 0-00209-021 4-40X3/8PP Screw, Panhead Phillips
Z 0 0-00220-002 5EFM4S Power_Entry Hardware
Z 0 0-00221-000 SR440FOOT Hardware, Misc.
Z 0 0-00231-043 #4 SHOULDER Washer, nylon
Z 0 0-00243-003 TO-220 Insulators
Z 0 0-00522-053 3-1/2" #24 Wire #24 UL1007 Strip 1/4x1/4 Tin
Z 0 0-00532-053 3-1/2 YEL NOTIN Wire #24 UL1007 Strip 1/4x1/4 Tin
Z 0 1-00066-112 7 PIN; 24AWG/WH Connector, Amp, MTA-100
Z 0 6-00002-611 .25A 3AG Fuse
Z 0 7-00119-720 SR440-1 Fabricated Part
Z 0 7-00120-720 SR440-2 Fabricated Part
Parts List SR445
REF. SRS PART# VALUE DESCRIPTION
Z 0 7-00338-709 SR445 Lexan Overlay
Z 0 9-00267-917 GENERIC Product Labels
Parts List SR445
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