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General Inforniation; Introduction; Description; Instrument Identification - HP AM-4380/U 5261A Technical Manual

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Table of Contents
1-1.

INTRODUCTION.

1-2.

DESCRIPTION.

1-3.
The
Hewlett-Packard
Amplifier is a plug-in unit which increases the sensitivity
of the Model 52431,, 52451I, and 5: 345A Electronic
Counters.
The Model 5261A provides for measurement
of signals as low as 1 millivolt over the frequency range
of 10 cps to 20 Me (52431) or 50) Mc (52451,).
input impedance is I megohm and may be increased to
1(0 megohms by using a 10: 1 divider probe (HP stock
no.
I000:
3A) An output signal is available at the
OUTPITT 50-ohm connector for monitoring the Video
Amplifier output or for activating external instruments.
This signal is identical in frequency and amplitude to the
amplified signal supplied to the counter input circuit.
1-4.
INSTRUMENT II)ENTIFICATION.
1-5.
Hewlett-Packard
number mounted on the rear panel. Earlier instruments
use an eight-digit serial number (000-00000). The first
three digits are a serial prefix number; the last five digits
refer to the specific instrument. Later instruments use a
nine-digit serial number (0000A00000).The
digits are the serial instrument. If the serial prefix on your
instrument does not appear on the title page of this
manual, there may be differences between the manual
prefix and the last five digits refer to the specific
BANDWIDTH:
10 cps to 50 Mc with 5245I,; 10 cps to 20 Mc
with 5243I,.
INPUT SENSITIVITY:
1 mV to 300 mV rms.
INPUT IMPEDANCE:
Approximately I megohm, 15 pf shunt;
HP 10003A Probe increases impedance to 10
megohms, 10 pf shunt.
ATTENUATOR RANGES:
1, 3, 10, :30, and 100 mV rms.
MAXIMUM INPUT
100 volts dc, 5 volts rms (ranges: 1, 3, 10,
30, 100 mV).
MONITOR:
Meter shows when the signal level is accept-
able to the counter.
ACCURACY:
Retains accuracy of 5243L, 5245L, or 5345A
Electronic Counters.
*When installed in the HP Model 5243L, 5245L, or 5345A Electronic Counters.
GENERAL INFORMATION
Model
5261A
Video
uses
a
two-section
first
TABLE 1-1. Specifications*
SECTION I
and your instrument.
be described in a change sheet included with the manual.
1-6.

ACCESSORY SUPPLIED.

1-7.
A
The
10507fi001, with BNC connectors is supplied in the
package with the Model 5261A.
1-8.

ACCESSORIES AVAILABLE.

1-9.
Table 1-2 lists the accessories available for the
Model 5261ilA Video Amplifier.
serial
10:1 divider probe, 10 pf shunt
600V max., dc to 40 Mc
50-ohm feed-through termination
four
50-conductor extender cable
Plug-in adapter (for use with 5345A)
50 OHM OUTTPUT:
Separate BNC front panel output for oscillo-
scope monitoring or for driving external equip-
ment; 50-ohm source impedance.
fier's most sensitive attenuator range, 1 mV
rms at input results in at least 100 mV rms at
auxiliary output into 50-ohm load.
undistorted output is 300 mV rms into 50-ohm
load.
ACCESSORY FURNISHED:
HP 100I 3A 10:1 Probe, 10 pf shunt, 600 volts
maximum; HP 10100A 50-ohm Feed-thru
Termination, 10506B Extender Cable, 10590A
Plug-In Adapter.
WEIGHT:
Net 2 lbs (0,90 kg); shipping 8 lbs (3,8 kg).
POWER:
Supplied by 5243I,, 5245L, or 5345A Electronic
Counters.
1-1/1-2
Paragraphs 1-1 to 1-9
If there are differences, they will
50
ohm,
low
microphonic
TABLE 1-2. Accessories Available
Description
On ampli-
Maximum
Model 5261A
Section I
cable
HP
HP Stock No.
10003A
10100A
10506C
10509A

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