SRS Labs SR445A User Manual

MODEL SR445A

350 MHz PREAMPLIFIER

MODEL SR445A

350 MHz PREAMPLIFIER

Phone: [phone] • Fax: [phone]

email: [e-mail] • www.thinkSRS.com

1290-D Reamwood Avenue

Sunnyvale, California 94089

Copyright © 2004 by SRS, Inc.

All Rights Reserved.

Revision 1.1 (03/2006)

Certification

Stanford Research Systems certifies that this product met its published specifications at
the time of shipment.

Warranty

This Stanford Research Systems product is warranted against defects in materials and
workmanship for a period of one (1) year from the date of shipment.

Service

For warranty service or repair, this product must be returned to a Stanford Research
Systems authorized service facility. Contact Stanford Research Systems or an authorized
representative before returning this product for repair.

Information in this document is subject to change without notice.

Copyright © Stanford Research Systems, Inc., 2004. All rights reserved.

Stanford Research Systems, Inc.
1290-C Reamwood Avenue
Sunnyvale, California 94089
Phone: [phone] • Fax: [phone]

www.thinkSRS.com • e-mail: [e-mail]

Printed in U.S.A.

SR445A Quad Fast Amplifier

Description

The SR445A is a four-channel, 350MHz bandwidth, dc coupled, 50Ω amplifier with a
gain of 5× (or +14dB) in a half-width 1U chassis. Two, three or four channels may be
cascaded for gains of 25×, 125×, or 625×, (+28dB, +42dB, or +56dB.) The unit uses
BNC connectors for inputs and outputs. The unit is powered from the ac mains by a
universal input power supply.

The full scale input is ±200mV. The input noise is typically 5.2nV/√Hz. The output is
linear over ±1V and should be terminated into a 50Ω load. Output rise and fall times are

1.3ns. The output will recover from a 10× full scale overload in 3ns. The unit is protected
from ±50V, 1µs input overloads.

There are five LEDs on the front panel; one indicates that the unit is powered and “on”
and four indicate when the output signal for the corresponding channel is outside its
linear range, typically ±1.3Vdc. Brief overloads (<5ns) trigger a 10ms flash.

Operation

The input impedance for each channel is 50Ω. (There is a front panel switch that allows
the input resistance of Channel 1 to be set to either 500Ω or 50Ω. The 500Ω setting
provides high transimpedance gain for current source—such as photomultiplier tubes—
that may be useful when the amplifier is located close to the signal source.) The dc input
voltage must be limited to ±4V to avoid damaging the amplifier front-end. The amplifier
is internally protected from 50V transients of 1µS duration. The 50Ω input impedance is
intended to terminate 50Ω coaxial cable such as RG-58.

The amplifiers perform well when cascaded due to their high input return loss and flat
frequency response characteristics. Referenced to the input, the broadband noise (1Hz to
300MHz) is 80µV
expect to see about 10mV
output of three cascaded amplifiers, and 250mV

. Peak-to-peak noise is typically 5× the RMS value and so one would

rms

at the output of two cascaded amplifiers, 50mVpp at the

pp

at the output of four cascaded

pp

amplifiers.

SR445A Specifications

Specification Min Typ Max Units

Inputs (driven by 50Ω source)

Input signal level -200 +200 mV
Impedance 49.5 50 50.5 Ω
Return loss 32 dB
Offset -500 0 +500 µV
Offset drift -10 +10 µV/°C
Bias current (note 1) 3 10 µA
Protection (dc) -4 +4 Vdc
Protection (1µS transient) -50 +50 V
Recovery time (10×FS overload) 3 nS
Noise (10Hz) 22 nV/√Hz
Noise (100Hz) 8.6 nV/√Hz
Noise (> 1kHz) 5.2 nV/√Hz
Noise (1Hz to 300MHz BW) 80 µVrms
Crosstalk (CH1 out to CH2 in) -61 dB
Crosstalk (CH2 out to CH1 in) -82 dB

Amplifier

Gain (note 2) 4.95 5.00 5.05 V/V
Bandwidth (-3dB) 350 MHz
Rise/fall time 1.3 nS
Propagation delay 2.7 nS

Outputs (driving 50Ω)

Source impedance (note 3) 49.5 50 50.5 Ω
Linear operation -1.0 +1.0 V
Overload level -1.3 +1.3 V
Limit level -1.6 +1.6 V

General

Number of Channels 4
Operating temperature 0 40 ºC
Mains voltage 90-132 175-264 Vac
Mains power 15 Watts
Mains frequency 47 63 Hz
Dimensions 8.35” 1.70” 8.10” W×H×D

Notes:

1. The input bias current flows out of the unit, creating a positive offset of about 150µV on the 50Ω

input termination. This offset will be affected by the dc impedance of the source that is connected
to the input.

2. Amplifier gain is calibrated by applying a known current to the input and measuring the voltage
into a high impedance load. The gain is adjusted so that a 1mA source applied to the input
produces a 500mV voltage at the unloaded output.

3. Channel 1 may be set to either 500Ω or 50.5Ω via a front panel switch.

Calibration

The purpose of the calibration is to verify operation of the unit and:

1. Adjust the high frequency compensation for best pulse response.

2. Adjust the offset to null the dc voltage at the output with no input.

3. Adjust the gain to 10× for an unloaded output so that the nominal gain for an
amplifier driving a 50Ω load will be 5× (or +14dB.)

Since the adjustments are interdependent, it is important that the adjustments be done in
the prescribed order, and that all of the adjustments be done. For example, adjusting the
high frequency compensation will affect the output offset. Calibration pots are accessible
from the underside of the unit.

Required equipment:

1. Pulse generator, splitter and attenuator to produce two ±100mV square waves
with a rise time of less than 1nS. (ECL reference output from SR620 Time
Interval Counter into an unmatched tee driving two 50Ω cables with a 20dB
attenuator on the one that goes to the SR445A.)

2. Digital voltmeter with 4-wire ohm measurement capability (Agilent 34401)

3. Digital oscilloscope with at least 300MHz bandwidth.

High Frequency Compensation

The SR445A uses an AD8009 current feedback amplifier in the output stage. The gain of
the amplifier is controlled by the ratio of resistors in the feedback network and the
bandwidth is controlled by the Thevenin equivalent source impedance of the feedback
network. The ratio is fixed (by R115 & R116, R215 & R216, R315 & R316, R415 &
R416) to provide a gain of 5× and the source impedance may be adjusted (by P102, P202,
P302 and P402.)

The bandwidth is set to optimize the pulse response of the amplifier. This is done by
applying a fast pulse at the input and adjusting P102 (or P202, P302 or P402 for channels
2, 3 & 4) so that the output rise time and overshoot most closely match the rise time and
overshoot of the fast input pulse as observed on a 300MHz oscilloscope with 50Ω input
impedance.

Note that adjusting P102 will affect the offset for channel 1, as there is a large input bias
current (150µA, max) to the inverting input of the AD8009. The offset will need to be
adjusted after the HF compensation is adjusted.

1. Split the ECL reference output from SR620 with a coax tee. Take one cable from
the tee to channel 1 of the oscilloscope (set to 50Ω input termination) and the
other to the top channel of the SR445A via a 20dB coaxial attenuator.

2. Adjust P102 (Channel 1 HF compensation pot) to match the output rise time and
overshoot to the input rise time and overshoot.

3. Repeat for the remaining three channels, adjusting the pulse response with P202,
P302 or P402.

Offset Calibration

The output offset is affected by the HF compensation and so the offset should be nulled
after the HF compensation is adjusted. The offset may also be affected by the amplifier
gain adjustment if there is a large input offset voltage.

1. Leave the inputs unconnected.

2. Connect the output (without a 50Ω load) to the DVM on the mV dc range.

3. Adjust the offset pot (P101 for channel 1) to null the output voltage.

4. Verify that the output voltage shifts down by less than 2.5mV when a 50Ω
terminator is placed on the input. (The voltage shift will be 10×[the input bias
current]×[the change of input resistance=25Ω] hence this measurement confirms
that the input bias current is less than 10µA.)

5. Repeat the procedure to null the output of channels 2, 3 and 4 by adjusting P201,
P301 and P401.

Gain Calibration

The overall gain of the amplifier is 5× when driving a 50Ω load and 10× when driving a
high impedance load. The input source to the amplifier is typically a current source (such
as the output from a photomultiplier) and so the magnitude of the input resistance is
included in the gain calibration by calibrating the amplifier’s transconductance.
(Calibration is done with a current source as an input while measuring the voltage at the
output.)

A DVM used in the 4-wire resistance mode is convenient for performing the calibration.
Typically a DVM will measure small resistances by measuring the voltage across the
resistor while passing a 1mA dc current through the resistor. We measure the gain of the
amplifier by measuring the voltage at the output while applying test current to input.
When the gain is properly adjusted, 1mA applied to the 50Ω input generates 50mV at the
input and 500mV at the (unterminated) output causing the DVM to indicate a
“resistance” of 500Ω. (To avoid auto ranging “confusion” by the DVM, a 453Ω resistor
is placed in series with the current source.)

Since the DVM uses a dc current as the test source, it is important that the amplifier
offset be nulled prior to performing the dc gain adjustment.

1. Setup the DVM in the 4-wire resistance measurement mode.

2. Apply the current output to the amplifier input via a 453Ω in-line resistor.

3. Apply the unterminated amplifier output to the DVM’s 4-wire sense input.

4. Adjust the gain pot (P100 for channel 1, P200 for channel 2, P300 for channel 3,
and P400 for channel 4) so that the DVM indicates a “resistance” of 500Ω.

5. Verify that the offset was nulled by connecting the current source from the DVM
to the input of the other channel and measuring a resistance of less than 1Ω.

6. Repeat the gain adjustment for the second channel.

Circuit Description

(The four amplifier channels are identical. This description uses reference designators for
the top channel.)

The input is terminated into 50Ω by the parallel combination of R100 & R101. The input
signal is coupled via a 47Ω resistor to the high speed “clamp-amp”, U100. U100 is
configured as a non-inverting gain of 2× amplifier. Pins 8 & 5 on U100 define input
clamping thresholds of ±0.31Vdc. If the input signal exceeds these thresholds then U100
will use the clamping thresholds as inputs thereby limiting its output to ±0.62Vdc. This
prevents the output of U100 from overdriving the next gain stage.

Input signals in excess of ±1.4Vdc are shunted to ground via the input protection diodes
D100 & D101. Normally both the diodes in D100 are reversed biased and so they do not
interfere with the signal. The diodes in D101 are forward biased by R103 & R104. When
the input signal exceeds ±1.4Vdc (7× the full scale input), one of the diodes in D100 will
turn “on” thereby limiting the input to U100 to a safe level.

The gain of U100 can be adjusted by ±10% by P100, which is calibrated at the factory to
set the overall gain of the channel to 5× when terminated into a 50Ω load. The output of
U100 is passed to the next gain stage via R112, a 47Ω resistor.

The next stage has a fixed gain of 5× with an adjustable offset and adjustable high
frequency response. The gain of U101 is set by R115 & R116. The offset, adjusted by
P101 and injected by R117, is nulled during calibration. The high frequency response of
U101 is affected by the source impedance of its input signal and its feedback network.
Turning P102 clockwise decreases the source impedance of the feedback signal and
increases the high frequency response of the gain stage. P102 is adjusted during
calibration for an optimum pulse response providing a typical -3dB bandwidth of
350MHz.

The output from U101 is passed to the front panel output BNC via the parallel resistors
R118 & R119, providing a 50Ω output impedance. These resistors, in combination with
the 50Ω load resistor (provided by the user), attenuate the signal by 2× so that the overall
gain is 5×.

Overloads are detected at the output of the second gain stage, U101. A positive overload
is rectified by D102 and charges C107. A negative overload is rectified by D102 and
discharges C106. One of the comparators in U102 will be driven low when the voltage on
C106 or C107 exceeds ±1.7V. The driven comparator discharges C108 from +5V to -5V.
C108 will be slowly recharged to +5V by R128, a 1MΩ resistor, thereby stretching the
overload signal to about 10ms. One of the comparators in U504 (sheet 3 of the
schematics) drives the front panel overload LED until the voltage on C108 recharges
above ground. This overload detection will detect overloads as short as 3ns.

Power Supplies

The unit operates from a universal input/single floating output power supply. The power
supply can operate from AC mains with 90-132Vac or 175-264Vac between 47 & 63Hz
and outputs 18Vdc. An “active ground” is generated by the op amp U501 together with
Q500 & Q501 to generate ±9V. The op amp amplifies the midpoint voltage of the dc
power supply, which is at its non-inverting input, and either sources current (via Q501)
into the negative rail or draws current (via Q500) from the positive rail so that the
midpoint is at ground.

The ±9Vdc is regulated to ±5Vdc by U502 and U503. The ±5Vdc power supplies are
passively filtered by capacitors on the outputs of the regulators and by L/C filters for each
amplifier channel. Careful power supply filtering is important to reduce channel
crosstalk. The crosstalk from the output of channel 1 to the input of channel 2 is less than

-60dB (1:1000 of the amplitude) and peaks around 300MHz. The crosstalk from the
output of channel 2 to the input of channel 1 is less than -80dB (1:10,000 of the
amplitude) and occurs in a broad band between 180MHz and 360MHz.

SR445A Component parts list

REF. # SRS P/N VALUE DESCRIPTION

C 100 5-00299-568 .1U Cap, Ceramic 50V SMT (1206) +/-10% X7R
C 101 5-00299-568 .1U Cap, Ceramic 50V SMT (1206) +/-10% X7R
C 102 5-00299-568 .1U Cap, Ceramic 50V SMT (1206) +/-10% X7R
C 103 5-00299-568 .1U Cap, Ceramic 50V SMT (1206) +/-10% X7R
C 104 5-00299-568 .1U Cap, Ceramic 50V SMT (1206) +/-10% X7R
C 105 5-00299-568 .1U Cap, Ceramic 50V SMT (1206) +/-10% X7R
C 106 5-00375-552 100P Capacitor, Chip (SMT1206), 50V, 5%, NPO
C 107 5-00375-552 100P Capacitor, Chip (SMT1206), 50V, 5%, NPO
C 108 5-00298-568 .01U Cap, Ceramic 50V SMT (1206) +/-10% X7R
C 110 5-00472-569 4.7U/T35 Cap, Tantalum, SMT (all case sizes)
C 111 5-00472-569 4.7U/T35 Cap, Tantalum, SMT (all case sizes)
C 200 5-00299-568 .1U Cap, Ceramic 50V SMT (1206) +/-10% X7R
C 201 5-00299-568 .1U Cap, Ceramic 50V SMT (1206) +/-10% X7R
C 202 5-00299-568 .1U Cap, Ceramic 50V SMT (1206) +/-10% X7R
C 203 5-00299-568 .1U Cap, Ceramic 50V SMT (1206) +/-10% X7R
C 204 5-00299-568 .1U Cap, Ceramic 50V SMT (1206) +/-10% X7R
C 205 5-00299-568 .1U Cap, Ceramic 50V SMT (1206) +/-10% X7R
C 206 5-00375-552 100P Capacitor, Chip (SMT1206), 50V, 5%, NPO
C 207 5-00375-552 100P Capacitor, Chip (SMT1206), 50V, 5%, NPO
C 208 5-00298-568 .01U Cap, Ceramic 50V SMT (1206) +/-10% X7R
C 210 5-00472-569 4.7U/T35 Cap, Tantalum, SMT (all case sizes)
C 211 5-00472-569 4.7U/T35 Cap, Tantalum, SMT (all case sizes)
C 300 5-00299-568 .1U Cap, Ceramic 50V SMT (1206) +/-10% X7R
C 301 5-00299-568 .1U Cap, Ceramic 50V SMT (1206) +/-10% X7R
C 302 5-00299-568 .1U Cap, Ceramic 50V SMT (1206) +/-10% X7R
C 303 5-00299-568 .1U Cap, Ceramic 50V SMT (1206) +/-10% X7R
C 304 5-00299-568 .1U Cap, Ceramic 50V SMT (1206) +/-10% X7R
C 305 5-00299-568 .1U Cap, Ceramic 50V SMT (1206) +/-10% X7R
C 306 5-00375-552 100P Capacitor, Chip (SMT1206), 50V, 5%, NPO
C 307 5-00375-552 100P Capacitor, Chip (SMT1206), 50V, 5%, NPO
C 308 5-00298-568 .01U Cap, Ceramic 50V SMT (1206) +/-10% X7R
C 310 5-00472-569 4.7U/T35 Cap, Tantalum, SMT (all case sizes)
C 311 5-00472-569 4.7U/T35 Cap, Tantalum, SMT (all case sizes)
C 400 5-00299-568 .1U Cap, Ceramic 50V SMT (1206) +/-10% X7R
C 401 5-00299-568 .1U Cap, Ceramic 50V SMT (1206) +/-10% X7R
C 402 5-00299-568 .1U Cap, Ceramic 50V SMT (1206) +/-10% X7R
C 403 5-00299-568 .1U Cap, Ceramic 50V SMT (1206) +/-10% X7R
C 404 5-00299-568 .1U Cap, Ceramic 50V SMT (1206) +/-10% X7R
C 405 5-00299-568 .1U Cap, Ceramic 50V SMT (1206) +/-10% X7R
C 406 5-00375-552 100P Capacitor, Chip (SMT1206), 50V, 5%, NPO
C 407 5-00375-552 100P Capacitor, Chip (SMT1206), 50V, 5%, NPO
C 408 5-00298-568 .01U Cap, Ceramic 50V SMT (1206) +/-10% X7R
C 410 5-00472-569 4.7U/T35 Cap, Tantalum, SMT (all case sizes)
C 411 5-00472-569 4.7U/T35 Cap, Tantalum, SMT (all case sizes)

REF. # SRS P/N VALUE DESCRIPTION
C 501 5-00516-526 330U HIGH RIPPL Capacitor, Electrolytic, 35V, 20%, Rad
C 502 5-00472-569 4.7U/T35 Cap, Tantalum, SMT (all case sizes)
C 503 5-00516-526 330U HIGH RIPPL Capacitor, Electrolytic, 35V, 20%, Rad
C 504 5-00472-569 4.7U/T35 Cap, Tantalum, SMT (all case sizes)
C 505 5-00299-568 .1U Cap, Ceramic 50V SMT (1206) +/-10% X7R
C 506 5-00299-568 .1U Cap, Ceramic 50V SMT (1206) +/-10% X7R
C 507 5-00299-568 .1U Cap, Ceramic 50V SMT (1206) +/-10% X7R
C 508 5-00299-568 .1U Cap, Ceramic 50V SMT (1206) +/-10% X7R
C 509 5-00299-568 .1U Cap, Ceramic 50V SMT (1206) +/-10% X7R
C 510 5-00299-568 .1U Cap, Ceramic 50V SMT (1206) +/-10% X7R
C 511 5-00472-569 4.7U/T35 Cap, Tantalum, SMT (all case sizes)
C 512 5-00472-569 4.7U/T35 Cap, Tantalum, SMT (all case sizes)
D 100 3-00896-301 BAV99 Diode
D 101 3-00896-301 BAV99 Diode
D 102 3-00896-301 BAV99 Diode
D 200 3-00896-301 BAV99 Diode
D 201 3-00896-301 BAV99 Diode
D 202 3-00896-301 BAV99 Diode
D 300 3-00896-301 BAV99 Diode
D 301 3-00896-301 BAV99 Diode
D 302 3-00896-301 BAV99 Diode
D 400 3-00896-301 BAV99 Diode
D 401 3-00896-301 BAV99 Diode
D 402 3-00896-301 BAV99 Diode
D 600 3-00010-303 GREEN LED, T1 Package
D 601 3-00011-303 RED LED, T1 Package
D 602 3-00011-303 RED LED, T1 Package
D 603 3-00011-303 RED LED, T1 Package
D 604 3-00011-303 RED LED, T1 Package
J 100 1-00003-120 BNC Connector, BNC
J 101 1-00003-120 BNC Connector, BNC
J 200 1-00003-120 BNC Connector, BNC
J 201 1-00003-120 BNC Connector, BNC
J 300 1-00003-120 BNC Connector, BNC
J 301 1-00003-120 BNC Connector, BNC
J 400 1-00003-120 BNC Connector, BNC
J 401 1-00003-120 BNC Connector, BNC
J 506 1-01043-171 5POS .100 JMPR Cable Assembly, Ribbon
L 100 6-00236-631 FR47 Ferrite bead, SMT
L 101 6-00236-631 FR47 Ferrite bead, SMT
L 200 6-00236-631 FR47 Ferrite bead, SMT
L 201 6-00236-631 FR47 Ferrite bead, SMT
L 300 6-00236-631 FR47 Ferrite bead, SMT
L 301 6-00236-631 FR47 Ferrite bead, SMT
L 400 6-00236-631 FR47 Ferrite bead, SMT
L 401 6-00236-631 FR47 Ferrite bead, SMT
L 500 6-00174-630 6611 TYPE 43 Ferrite Beads

REF. # SRS P/N VALUE DESCRIPTION
L 501 6-00174-630 6611 TYPE 43 Ferrite Beads
P 100 4-01614-441 10 Pot, Multi-Turn Trim, 3/8" Square Top Ad
P 101 4-00011-441 10K Pot, Multi-Turn Trim, 3/8" Square Top Ad
P 102 4-00353-441 100 Pot, Multi-Turn Trim, 3/8" Square Top Ad
P 200 4-01614-441 10 Pot, Multi-Turn Trim, 3/8" Square Top Ad
P 201 4-00011-441 10K Pot, Multi-Turn Trim, 3/8" Square Top Ad
P 202 4-00353-441 100 Pot, Multi-Turn Trim, 3/8" Square Top Ad
P 300 4-01614-441 10 Pot, Multi-Turn Trim, 3/8" Square Top Ad
P 301 4-00011-441 10K Pot, Multi-Turn Trim, 3/8" Square Top Ad
P 302 4-00353-441 100 Pot, Multi-Turn Trim, 3/8" Square Top Ad
P 400 4-01614-441 10 Pot, Multi-Turn Trim, 3/8" Square Top Ad
P 401 4-00011-441 10K Pot, Multi-Turn Trim, 3/8" Square Top Ad
P 402 4-00353-441 100 Pot, Multi-Turn Trim, 3/8" Square Top Ad
PC1 7-01479-701 SR240A/445A Printed Circuit Board
Q 500 3-01091-360 MJD44H11 Integrated Circuit (Surface Mount Pkg)
Q 501 3-01100-360 MJD45H11 Integrated Circuit (Surface Mount Pkg)
R 1 4-00997-462 56.2 Thin Film, 1%, 50 ppm, MELF Resistor
R 100 4-01117-462 1.00K Thin Film, 1%, 50 ppm, MELF Resistor
R 101 4-01117-462 1.00K Thin Film, 1%, 50 ppm, MELF Resistor
R 102 4-01447-461 47 Thick Film, 5%, 200 ppm, Chip Resistor
R 103 4-01503-461 10K Thick Film, 5%, 200 ppm, Chip Resistor
R 104 4-01503-461 10K Thick Film, 5%, 200 ppm, Chip Resistor
R 105 4-01021-462 100 Thin Film, 1%, 50 ppm, MELF Resistor
R 106 4-01134-462 1.50K Thin Film, 1%, 50 ppm, MELF Resistor
R 107 4-01021-462 100 Thin Film, 1%, 50 ppm, MELF Resistor
R 108 4-01134-462 1.50K Thin Film, 1%, 50 ppm, MELF Resistor
R 109 4-01021-462 100 Thin Film, 1%, 50 ppm, MELF Resistor
R 110 4-01021-462 100 Thin Film, 1%, 50 ppm, MELF Resistor
R 112 4-01447-461 47 Thick Film, 5%, 200 ppm, Chip Resistor
R 115 4-01050-462 200 Thin Film, 1%, 50 ppm, MELF Resistor
R 116 4-00992-462 49.9 Thin Film, 1%, 50 ppm, MELF Resistor
R 117 4-01242-462 20.0K Thin Film, 1%, 50 ppm, MELF Resistor
R 118 4-01021-462 100 Thin Film, 1%, 50 ppm, MELF Resistor
R 119 4-01021-462 100 Thin Film, 1%, 50 ppm, MELF Resistor
R 120 4-01527-461 100K Thick Film, 5%, 200 ppm, Chip Resistor
R 121 4-01021-462 100 Thin Film, 1%, 50 ppm, MELF Resistor
R 122 4-01134-462 1.50K Thin Film, 1%, 50 ppm, MELF Resistor
R 123 4-01134-462 1.50K Thin Film, 1%, 50 ppm, MELF Resistor
R 124 4-01527-461 100K Thick Film, 5%, 200 ppm, Chip Resistor
R 125 4-01021-462 100 Thin Film, 1%, 50 ppm, MELF Resistor
R 126 4-01163-462 3.01K Thin Film, 1%, 50 ppm, MELF Resistor
R 127 4-01163-462 3.01K Thin Film, 1%, 50 ppm, MELF Resistor
R 128 4-01551-461 1.0M Thick Film, 5%, 200 ppm, Chip Resistor
R 200 4-01021-462 100 Thin Film, 1%, 50 ppm, MELF Resistor
R 201 4-01021-462 100 Thin Film, 1%, 50 ppm, MELF Resistor
R 202 4-01447-461 47 Thick Film, 5%, 200 ppm, Chip Resistor
R 203 4-01503-461 10K Thick Film, 5%, 200 ppm, Chip Resistor

REF. # SRS P/N VALUE DESCRIPTION
R 204 4-01503-461 10K Thick Film, 5%, 200 ppm, Chip Resistor
R 205 4-01021-462 100 Thin Film, 1%, 50 ppm, MELF Resistor
R 206 4-01134-462 1.50K Thin Film, 1%, 50 ppm, MELF Resistor
R 207 4-01021-462 100 Thin Film, 1%, 50 ppm, MELF Resistor
R 208 4-01134-462 1.50K Thin Film, 1%, 50 ppm, MELF Resistor
R 209 4-01021-462 100 Thin Film, 1%, 50 ppm, MELF Resistor
R 210 4-01021-462 100 Thin Film, 1%, 50 ppm, MELF Resistor
R 212 4-01447-461 47 Thick Film, 5%, 200 ppm, Chip Resistor
R 215 4-01050-462 200 Thin Film, 1%, 50 ppm, MELF Resistor
R 216 4-00992-462 49.9 Thin Film, 1%, 50 ppm, MELF Resistor
R 217 4-01242-462 20.0K Thin Film, 1%, 50 ppm, MELF Resistor
R 218 4-01021-462 100 Thin Film, 1%, 50 ppm, MELF Resistor
R 219 4-01021-462 100 Thin Film, 1%, 50 ppm, MELF Resistor
R 220 4-01527-461 100K Thick Film, 5%, 200 ppm, Chip Resistor
R 221 4-01021-462 100 Thin Film, 1%, 50 ppm, MELF Resistor
R 222 4-01134-462 1.50K Thin Film, 1%, 50 ppm, MELF Resistor
R 223 4-01134-462 1.50K Thin Film, 1%, 50 ppm, MELF Resistor
R 224 4-01527-461 100K Thick Film, 5%, 200 ppm, Chip Resistor
R 225 4-01021-462 100 Thin Film, 1%, 50 ppm, MELF Resistor
R 226 4-01163-462 3.01K Thin Film, 1%, 50 ppm, MELF Resistor
R 227 4-01163-462 3.01K Thin Film, 1%, 50 ppm, MELF Resistor
R 228 4-01551-461 1.0M Thick Film, 5%, 200 ppm, Chip Resistor
R 300 4-01021-462 100 Thin Film, 1%, 50 ppm, MELF Resistor
R 301 4-01021-462 100 Thin Film, 1%, 50 ppm, MELF Resistor
R 302 4-01447-461 47 Thick Film, 5%, 200 ppm, Chip Resistor
R 303 4-01503-461 10K Thick Film, 5%, 200 ppm, Chip Resistor
R 304 4-01503-461 10K Thick Film, 5%, 200 ppm, Chip Resistor
R 305 4-01021-462 100 Thin Film, 1%, 50 ppm, MELF Resistor
R 306 4-01134-462 1.50K Thin Film, 1%, 50 ppm, MELF Resistor
R 307 4-01021-462 100 Thin Film, 1%, 50 ppm, MELF Resistor
R 308 4-01134-462 1.50K Thin Film, 1%, 50 ppm, MELF Resistor
R 309 4-01021-462 100 Thin Film, 1%, 50 ppm, MELF Resistor
R 310 4-01021-462 100 Thin Film, 1%, 50 ppm, MELF Resistor
R 312 4-01447-461 47 Thick Film, 5%, 200 ppm, Chip Resistor
R 315 4-01050-462 200 Thin Film, 1%, 50 ppm, MELF Resistor
R 316 4-00992-462 49.9 Thin Film, 1%, 50 ppm, MELF Resistor
R 317 4-01242-462 20.0K Thin Film, 1%, 50 ppm, MELF Resistor
R 318 4-01021-462 100 Thin Film, 1%, 50 ppm, MELF Resistor
R 319 4-01021-462 100 Thin Film, 1%, 50 ppm, MELF Resistor
R 320 4-01527-461 100K Thick Film, 5%, 200 ppm, Chip Resistor
R 321 4-01021-462 100 Thin Film, 1%, 50 ppm, MELF Resistor
R 322 4-01134-462 1.50K Thin Film, 1%, 50 ppm, MELF Resistor
R 323 4-01134-462 1.50K Thin Film, 1%, 50 ppm, MELF Resistor
R 324 4-01527-461 100K Thick Film, 5%, 200 ppm, Chip Resistor
R 325 4-01021-462 100 Thin Film, 1%, 50 ppm, MELF Resistor
R 326 4-01163-462 3.01K Thin Film, 1%, 50 ppm, MELF Resistor
R 327 4-01163-462 3.01K Thin Film, 1%, 50 ppm, MELF Resistor

REF. # SRS P/N VALUE DESCRIPTION
R 328 4-01551-461 1.0M Thick Film, 5%, 200 ppm, Chip Resistor
R 400 4-01021-462 100 Thin Film, 1%, 50 ppm, MELF Resistor
R 401 4-01021-462 100 Thin Film, 1%, 50 ppm, MELF Resistor
R 402 4-01447-461 47 Thick Film, 5%, 200 ppm, Chip Resistor
R 403 4-01503-461 10K Thick Film, 5%, 200 ppm, Chip Resistor
R 404 4-01503-461 10K Thick Film, 5%, 200 ppm, Chip Resistor
R 405 4-01021-462 100 Thin Film, 1%, 50 ppm, MELF Resistor
R 406 4-01134-462 1.50K Thin Film, 1%, 50 ppm, MELF Resistor
R 407 4-01021-462 100 Thin Film, 1%, 50 ppm, MELF Resistor
R 408 4-01134-462 1.50K Thin Film, 1%, 50 ppm, MELF Resistor
R 409 4-01021-462 100 Thin Film, 1%, 50 ppm, MELF Resistor
R 410 4-01021-462 100 Thin Film, 1%, 50 ppm, MELF Resistor
R 412 4-01447-461 47 Thick Film, 5%, 200 ppm, Chip Resistor
R 415 4-01050-462 200 Thin Film, 1%, 50 ppm, MELF Resistor
R 416 4-00992-462 49.9 Thin Film, 1%, 50 ppm, MELF Resistor
R 417 4-01242-462 20.0K Thin Film, 1%, 50 ppm, MELF Resistor
R 418 4-01021-462 100 Thin Film, 1%, 50 ppm, MELF Resistor
R 419 4-01021-462 100 Thin Film, 1%, 50 ppm, MELF Resistor
R 420 4-01527-461 100K Thick Film, 5%, 200 ppm, Chip Resistor
R 421 4-01021-462 100 Thin Film, 1%, 50 ppm, MELF Resistor
R 422 4-01134-462 1.50K Thin Film, 1%, 50 ppm, MELF Resistor
R 423 4-01134-462 1.50K Thin Film, 1%, 50 ppm, MELF Resistor
R 424 4-01527-461 100K Thick Film, 5%, 200 ppm, Chip Resistor
R 425 4-01021-462 100 Thin Film, 1%, 50 ppm, MELF Resistor
R 426 4-01163-462 3.01K Thin Film, 1%, 50 ppm, MELF Resistor
R 427 4-01163-462 3.01K Thin Film, 1%, 50 ppm, MELF Resistor
R 428 4-01551-461 1.0M Thick Film, 5%, 200 ppm, Chip Resistor
R 500 4-01213-462 10.0K Thin Film, 1%, 50 ppm, MELF Resistor
R 501 4-01213-462 10.0K Thin Film, 1%, 50 ppm, MELF Resistor
R 502 4-01479-461 1.0K Thick Film, 5%, 200 ppm, Chip Resistor
R 503 4-01021-462 100 Thin Film, 1%, 50 ppm, MELF Resistor
R 504 4-00320-409 18 Resistor, Wire Wound
R 505 4-01479-461 1.0K Thick Film, 5%, 200 ppm, Chip Resistor
R 506 4-01479-461 1.0K Thick Film, 5%, 200 ppm, Chip Resistor
R 507 4-01479-461 1.0K Thick Film, 5%, 200 ppm, Chip Resistor
R 508 4-01479-461 1.0K Thick Film, 5%, 200 ppm, Chip Resistor
R 509 4-01479-461 1.0K Thick Film, 5%, 200 ppm, Chip Resistor
R 510 4-01527-461 100K Thick Film, 5%, 200 ppm, Chip Resistor
SW100 2-00025-217 SPDT Switch, On-None-On, Toggle, Right Angle
U 100 3-00897-360 AD8037 Integrated Circuit (Surface Mount Pkg)
U 101 3-00898-360 AD8009 Integrated Circuit (Surface Mount Pkg)
U 102 3-00728-360 LM393 Integrated Circuit (Surface Mount Pkg)
U 200 3-00897-360 AD8037 Integrated Circuit (Surface Mount Pkg)
U 201 3-00898-360 AD8009 Integrated Circuit (Surface Mount Pkg)
U 202 3-00728-360 LM393 Integrated Circuit (Surface Mount Pkg)
U 300 3-00897-360 AD8037 Integrated Circuit (Surface Mount Pkg)
U 301 3-00898-360 AD8009 Integrated Circuit (Surface Mount Pkg)

REF. # SRS P/N VALUE DESCRIPTION
U 302 3-00728-360 LM393 Integrated Circuit (Surface Mount Pkg)
U 400 3-00897-360 AD8037 Integrated Circuit (Surface Mount Pkg)
U 401 3-00898-360 AD8009 Integrated Circuit (Surface Mount Pkg)
U 402 3-00728-360 LM393 Integrated Circuit (Surface Mount Pkg)
U 501 3-00729-360 LM741C Integrated Circuit (Surface Mount Pkg)
U 502 3-00112-329 7805 Voltage Reg., TO-220 (TAB) Package
U 503 3-00119-329 7905 Voltage Reg., TO-220 (TAB) Package
U 504 3-00728-360 LM393 Integrated Circuit (Surface Mount Pkg)
U 505 3-00728-360 LM393 Integrated Circuit (Surface Mount Pkg)
Z 0 0-00043-011 4-40 KEP Nut, Kep
Z 0 0-00096-041 #4 SPLIT Washer, Split
Z 0 0-00187-021 4-40X1/4PP Screw, Panhead Phillips
Z 0 0-00197-002 3ED8 Power Entry Hardware
Z 0 0-00222-021 6-32X1/4PP Screw, Panhead Phillips
Z 0 0-00238-026 6-32X1/4PF Screw, Black, All Types
Z 0 0-00240-026 4-40X3/8PF Screw, Black, All Types
Z 0 0-00252-057 GROMMET DG532 Grommet
Z 0 0-00267-052 6-1/2" #22 RED Wire #22 UL1007
Z 0 0-00268-052 6-1/2" #22 BL Wire #22 UL1007
Z 0 0-00330-050 5-1/2" #18 Wire #18 UL1007 Stripped 3/8x3/8 No Tin
Z 0 0-00415-031 4-40X1/2 M/F Standoff
Z 0 0-00517-000 BINDING POST Hardware, Misc.
Z 0 0-00536-032 31894 Termination
Z 0 0-00772-000 1.5" WIRE Hardware, Misc.
Z 0 0-00907-020 6-32X1/4 PF UC Screw, Flathead Phillips
Z 0 0-01068-000 SR445A FOOT Hardware, Misc.
Z 0 1-00033-113 5 PIN, 18AWG/OR Connector, Amp, MTA-156
Z 0 1-00254-113 2 PIN, 22AWG/RD Connector, Amp, MTA-156
Z 0 2-00049-211 SPST ON-NONE-OF Switch, Rocker
Z 0 6-00626-615 18V-15WATT Power Supply
Z 0 7-00167-720 SR445A Fabricated Part
Z 0 7-00349-720 SR445A Fabricated Part
Z 0 7-00380-721 SR445A/SR240A Machined Part
Z 0 7-01480-720 SR445A, RCK MT Fabricated Part
Z 0 7-01481-709 SR445A Lexan Overlay
Z 0 7-01482-720 SR445A Fabricated Part
Z 0 7-01622-720 SR445A MYLAR Fabricated Part
Z 0 9-00267-917 GENERIC Product Labels