Introduction - Stanford Research Systems SR446 Operation And Service Manual

8

1.1 Introduction

Stanford Research Systems
INPUT
– Out
±500 mV max 50
USB
The SR446 is a single‑channel, 400 MHz bandwidth voltage preamplifier
with 21 programmable gains from × 1 to × 100 ( + 0 dB to + 40 dB) in
2 dB steps. The amplifier also includes a programmable low‑pass filter
with four settings: full bandwidth, 200 MHz, 100 MHz, and 20 MHz.
The two 50 Ω outputs provide complementary outputs (inverting and
non‑inverting), and can be used separately or together as a differential
output.
Model SR446
OUTPUTS INPUT SETUP
Term Couple
+ Out
500
50
Hold on
50
GND to null o set
WARNING
No user serviceable parts inside. Refer to operation manual for
safety notice. For use by quali ed laboratory personnel only.
The front panel user interface (see Figure 1.1) displays the complete
state of the instrument. All configuration settings can be performed
either through the front panel directly, or remotely through the USB
interface located on the rear panel (see Figure 1.2). A connect indicator
shows when the remote USB interface is connected and ready for
communication. An error indicator illuminates if any remote command
errors have occurred, and will remain lit until the STAT? query is
executed. The power standby indicator shows that the AC main power
is connected and the SR446 is ready to be turned on.
DC to 400 MHz Programmable Gain Preampli er
GAIN
Ovld
AC
DC
2 dB
GND
steps
Units
dB
V / V
Figure 1.1: The front panel of the SR446.
CHASSIS
GROUND
Stanford Research Systems
MODEL SR446 Programmable Gain Preamp
Designed and Assembled in the U.S.A.
Figure 1.2: The rear panel of the SR446.
SR446 400 MHz Programmable Gain Preamplifier
1 Operation
REMOTE
OUTPUT FILTER
Bandwidth Limit Connect
full BW Error
POWER
200 MHz
100 MHz Standby
20 MHz
AC POWER
90 264 VAC, 47 63 Hz − −
15 W (max)